NCBI Conserved Domain Search

Pleckstrin homology domain;

Pssm-ID: 465218 Cd Length: 143 Bit Score: 264.64 E-value: 1.02e-81

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  1400 VQCEGLAEQLIFNSLTNCLGPRKLLHSGKLYKTKSNKELHAFLFNDFLLLTYLVRQFAAaSGHEKLFNSKSSAQFRMYKT 1479
Cdd:pfam16652    1 VQCEGLSEQLVFNSLTNCLGPRKLLHSGKLYKVKSNKELVGFLFNDFLLLTQPVKPLSS-AGTDKLFSSKSNIQYKMYKT 79

                           90       100       110       120       130       140
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401  1480 PIFLNEVLVKLPTDPSSDEPVFHISHIDRVYTLRTDNINERTAWVQKIKGASEQYIDTEKKKRE 1543
Cdd:pfam16652   80 PIFLNEVMVKLPTDPSSSEPTFQLSHIDRVYTLKAESPNERTAWVKKIKEASELYIETEKKKRE 143

C2 domain present in Intersectin; A single instance of the C2 domain is located C terminally in the intersectin protein. Intersectin functions as a scaffolding protein, providing a link between the actin cytoskeleton and the components of endocytosis and plays a role in signal transduction. In addition to C2, intersectin contains several additional domains including: Eps15 homology domains, SH3 domains, a RhoGEF domain, and a PH domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. The members here have topology I.

Pssm-ID: 176021 [Multi-domain] Cd Length: 136 Bit Score: 262.32 E-value: 4.95e-81

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1543 EKAYQARSQKTSGIGRLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCL 1622
Cdd:cd08375     1 EKAYLARSQRASGIGRLMVVIVEGRDLKPCNSNGKSDPYCEVSMGSQEHKTKVVSDTLNPKWNSSMQFFVKDLEQDVLCI 80

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1623 TMFDRDQFSPDDFLGRTEVPVAKIRTE-QESKGPTTRRLLLHEVPTGEVWVRFDLQ 1677
Cdd:cd08375    81 TVFDRDFFSPDDFLGRTEIRVADILKEtKESKGPITKRLLLHEVPTGEVVVKLDLQ 136

Intersectin Pleckstrin homology (PH) domain; ITSNs, an adaptor protein family, play a role in endo- and exocytosis, actin cytoskeleton rearrangement and signal transduction. There are two human ITSN genes: ITSN1 and ITSN2. They share significant sequence identity and a similar domain structure having both short and long isoforms produced by alternative splicing. The short isoform (ITSN-S) consists of two Eps15 homology domains (EH1 and EH2), a coiled-coil region (CCR) and five Src homology 3 domains (SH3A-E). The EH domains bind to Asn-Pro-Phe motifs and are implicated in endocytosis and vesicle transport. The SH3 domains bind to proline-rich sequences and are commonly found in proteins implicated in cell signalling pathways, cytoskeletal organization and membrane traffic. The long isoform (ITSN-L) contains three additional C-terminal domains, a Dbl homology domain (DH), a Pleckstrin homology domain (PH) and a C2 domain. The tandem DH-PH domains are present in all Dbl family of GEFs. ITSN acts specifically on Cdc42 through its DH domain with no portion of the PH domain making contact with Cdc42. This is in contrast to Dbs which requires the PH domain for full catalytic activity. The ITSN PH domain binds phosphoinositides. C2 domains are usually involved in Ca2+-dependent and Ca2+-independent phospholipid binding. There are more than 30 proteins that interact with ITSNs. ITSN-S is present in mammals, frogs, flies and nematodes, while ITSN-L is present only in vertebrates. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270084 Cd Length: 132 Bit Score: 236.20 E-value: 6.30e-72

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1408 QLIFNSLTNCLGPRKLLHSGKLYKTKSNKELHAFLFNDFLLLTYLVRQFAAaSGHEKLFNSKSSAQFRMYKTPIFLNEVL 1487
Cdd:cd13264     1 QLIFNSVTNCLGPRKFLHSGKLYKAKSNKELYGFLFNDFLLLTQPIKPLGS-SGNDFVFDNKANIQYKMYKTPIFLNEVL 79

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1488 VKLPTDPSSDEPVFHISHIDRVYTLRTDNINERTAWVQKIKGASEQYIDTEKK 1540
Cdd:cd13264    80 VKLPTDPSGDEPIFHISHIDRVYTLRAESINERTAWVQKIKAASELYIETEKK 132

Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases; Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases Also called Dbl-homologous (DH) domain. It appears that PH domains invariably occur C-terminal to RhoGEF/DH domains. Improved coverage.

Pssm-ID: 214619 [Multi-domain] Cd Length: 180 Bit Score: 159.77 E-value: 1.23e-44

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   1202 IHELIQTEERYMDDLQLVIEVFQKRM-AESGFLTEADMALIFVNWKELIMSNTKLLRALRVRKKTggEKMPVQMIGDILA 1280
Cdd:smart00325    2 LKELLQTERNYVRDLKLLVEVFLKPLkKELKLLSPNELETLFGNIEEIYEFHRDFLDELEERIEE--WDDSVERIGDVFL 79

                            90       100       110       120       130       140       150       160
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   1281 AELSHMQAYIRFCSCQLNGATLLQQKtDEDTDFKEFLKKLASDPRCKGMPLSSFLLKPMQRITRYPLLIRSILENTPQSH 1360
Cdd:smart00325   80 KLEEFFKIYSEYCSNHPDALELLKKL-KKNPRFQKFLKEIESSPQCRRLTLESLLLKPVQRLTKYPLLLKELLKHTPEDH 158

                           170       180
                    ....*....|....*....|..
gi 312176401   1361 VDHSSLKLALERAEELCSQVNE 1382
Cdd:smart00325  159 EDREDLKKALKAIKELANQVNE 180

Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases; Also called Dbl-homologous (DH) domain. It appears that PH domains invariably occur C-terminal to RhoGEF/DH domains.

Pssm-ID: 238091 [Multi-domain] Cd Length: 181 Bit Score: 159.39 E-value: 1.91e-44

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1198 RQGYIHELIQTEERYMDDLQLVIEVFQKRMAESG-FLTEADMALIFVNWKELIMSNTKLLRALRVRKKTGGekMPVQMIG 1276
Cdd:cd00160     1 RQEVIKELLQTERNYVRDLKLLVEVFLKPLDKELlPLSPEEVELLFGNIEEIYEFHRIFLKSLEERVEEWD--KSGPRIG 78

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1277 DILAAELSHMQAYIRFCSCQLNGATLLQQKTDEDTDFKEFLKKLasDPRCKGMPLSSFLLKPMQRITRYPLLIRSILENT 1356
Cdd:cd00160    79 DVFLKLAPFFKIYSEYCSNHPDALELLKKLKKFNKFFQEFLEKA--ESECGRLKLESLLLKPVQRLTKYPLLLKELLKHT 156

                         170       180
                  ....*....|....*....|....*
gi 312176401 1357 PQSHVDHSSLKLALERAEELCSQVN 1381
Cdd:cd00160   157 PDGHEDREDLKKALEAIKEVASQVN 181

RhoGEF domain; Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases Also called Dbl-homologous (DH) domain. It appears that pfam00169 domains invariably occur C-terminal to RhoGEF/DH domains.

Pssm-ID: 459876 [Multi-domain] Cd Length: 176 Bit Score: 159.00 E-value: 2.09e-44

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  1202 IHELIQTEERYMDDLQLVIEVFQKRMAESGFLTEADMALIFVNWKELIMSNTKLLraLRVRKKtggEKMPVQMIGDILAA 1281
Cdd:pfam00621    2 IKELLQTERSYVRDLEILVEVFLPPNSKPLSESEEEIKTIFSNIEEIYELHRQLL--LEELLK---EWISIQRIGDIFLK 76

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  1282 ELSHMQAYIRFCSCQLNGATLLQQKTDEDTDFKEFLKKLASDPRCKGMPLSSFLLKPMQRITRYPLLIRSILENTPQSHV 1361
Cdd:pfam00621   77 FAPGFKVYSTYCSNYPKALKLLKKLLKKNPKFRAFLEELEANPECRGLDLNSFLIKPVQRIPRYPLLLKELLKHTPPDHP 156

                          170       180
                   ....*....|....*....|
gi 312176401  1362 DHSSLKLALERAEELCSQVN 1381
Cdd:pfam00621  157 DYEDLKKALEAIKEVAKQIN 176

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 130.38 E-value: 6.74e-36

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  747 LVNYRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11988     1 LVNYRALYPFEARNHDEMSFNAGDIIQVDEKTVGEPGWLYGSFQGNFGWFPCNYVEK 57

Eps15 homology domain; Pair of EF hand motifs that recognise proteins containing Asn-Pro-Phe (NPF) sequences.

Pssm-ID: 197477 [Multi-domain] Cd Length: 96 Bit Score: 129.32 E-value: 4.71e-35

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401     15 MWAITSEERTKHDKQFDNLKPSG-GYITGDQARTFFLQSGLPAPVLAEIWALSDLNKDGKMDQQEFSIAMKLIKLKLQGQ 93
Cdd:smart00027    1 PWAISPEDKAKYEQIFRSLDKNQdGTVTGAQAKPILLKSGLPQTLLAKIWNLADIDNDGELDKDEFALAMHLIYRKLNGY 80

                            90
                    ....*....|....
gi 312176401     94 QLPVVLPPIMKQPP 107
Cdd:smart00027   81 PIPASLPPSLIPPS 94

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 126.20 E-value: 2.15e-34

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARGKKRQKGWFPASHVKLL 1103
Cdd:cd11994     1 IAQVTTAYVASGVEQLSLSPGQLILILKKNSSGWWLGELQARGKKRQKGWFPASHVKLL 59

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 122.78 E-value: 2.61e-33

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1118 CQVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11996     1 CQVIAMYDYTANNEDELSFSKGQLINVLNKDDPDWWQGEINGVTGLFPSNYVKM 54

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 122.07 E-value: 5.32e-33

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11990     1 KAQALCSWTAKKDNHLNFSKNDIITVLEQQENWWFGEVHGGRGWFPKSYVKL 52

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 120.50 E-value: 1.65e-32

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11992     1 EYIALYPYSSSEPGDLTFNEGEEILVTQKDGEWWTGSIEDRTGIFPSNYVRP 52

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 116.30 E-value: 4.78e-31

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11836     2 YRALYAFEARNPDEISFQPGDIIQVDESQVAEPGWLAGELKGKTGWFPANYVEK 55

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 115.13 E-value: 1.54e-30

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARGKKRQKGWFPASHVKL 1102
Cdd:cd11839     1 IAQVIAPFTATAENQLSLAVGQLVLVRKKSPSGWWEGELQARGKKRQIGWFPANYVKL 58

Fourth Src homology 3 domain (or SH3D) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212926 Cd Length: 65 Bit Score: 114.06 E-value: 4.16e-30

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1041 KKPEIAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARGKKRQKGWFPASHVKLLGP 1105
Cdd:cd11993     1 KKPEIAQVIASYTATGPEQLTLAPGQLILIRKKNPGGWWEGELQARGKKRQIGWFPANYVKLLSP 65

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 112.89 E-value: 7.49e-30

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11838     2 YIALYPYESNEPGDLTFNAGDVILVTKKDGEWWTGTIGDRTGIFPSNYVRP 52

Eps15 homology domain; Pair of EF hand motifs that recognise proteins containing Asn-Pro-Phe (NPF) sequences.

Pssm-ID: 197477 [Multi-domain] Cd Length: 96 Bit Score: 113.53 E-value: 1.64e-29

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401    238 EWAVPQPSRLKYRQKFNSLDKGMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMHLTDMAKAGQ 317
Cdd:smart00027    1 PWAISPEDKAKYEQIFRSLDKNQDGTVTGAQAKPILLKSGLPQTLLAKIWNLADIDNDGELDKDEFALAMHLIYRKLNGY 80

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 110.97 E-value: 3.74e-29

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11840     1 QVIALFPYTAQNEDELSFQKGDIINVLSKDDPDWWRGELNGQTGLFPSNYVEP 53

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 103.50 E-value: 1.54e-26

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1118 CQVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11995     1 CQVIGMYDYTAQNDDELAFSKGQIINVLNKEDPDWWKGELNGQVGLFPSNYVKL 54

C2 domain; The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175973 [Multi-domain] Cd Length: 102 Bit Score: 104.07 E-value: 4.14e-26

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKPNGKSNPYCEVSMGS-QSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDFLG 1637
Cdd:cd00030     1 LRVTVIEARNLPAKDLNGKSDPYVKVSLGGkQKFKTKVVKNTLNPVWNETFEFPVLDPESDTLTVEVWDKDRFSKDDFLG 80

                          90
                  ....*....|....*
gi 312176401 1638 RTEVPVAKIRTEQES 1652
Cdd:cd00030    81 EVEIPLSELLDSGKE 95

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 101.67 E-value: 6.29e-26

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGR-GWFPKSYVKL 934
Cdd:cd11837     1 TATALYPWRAKKENHLSFAKGDIITVLEQQEMWWFGELEGGEeGWFPKSYVKE 53

C2 domain;

Pssm-ID: 425499 [Multi-domain] Cd Length: 104 Bit Score: 100.86 E-value: 5.06e-25

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM--GSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDD 1634
Cdd:pfam00168    1 GRLTVTVIEAKNLPPKDGNGTSDPYVKVYLldGKQKKKTKVVKNTLNPVWNETFTFSVPDPENAVLEIEVYDYDRFGRDD 80

                           90
                   ....*....|..
gi 312176401  1635 FLGRTEVPVAKI 1646
Cdd:pfam00168   81 FIGEVRIPLSEL 92

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

Pssm-ID: 238009 [Multi-domain] Cd Length: 67 Bit Score: 98.06 E-value: 1.55e-24

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  249 YRQKFNSLDKGMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMHLTDMAKA 315
Cdd:cd00052     1 YDQIFRSLDPDGDGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

Eps15 homology domain; found in proteins implicated in endocytosis, vesicle transport, and signal transduction. The alignment contains a pair of EF-hand motifs, typically one of them is canonical and binds to Ca2+, while the other may not bind to Ca2+. A hydrophobic binding pocket is formed by residues from both EF-hand motifs. The EH domain binds to proteins containing NPF (class I), [WF]W or SWG (class II), or H[TS]F (class III) sequence motifs.

Pssm-ID: 238009 [Multi-domain] Cd Length: 67 Bit Score: 96.13 E-value: 7.06e-24

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401   27 DKQFDNLKPSG-GYITGDQARTFFLQSGLPAPVLAEIWALSDLNKDGKMDQQEFSIAMKLIKLKLQ 91
Cdd:cd00052     2 DQIFRSLDPDGdGLISGDEARPFLGKSGLPRSVLAQIWDLADTDKDGKLDKEEFAIAMHLIALALN 67

Protein kinase C conserved region 2 (CalB); Ca2+-binding motif present in phospholipases, protein kinases C, and synaptotagmins (among others). Some do not appear to contain Ca2+-binding sites. Particular C2s appear to bind phospholipids, inositol polyphosphates, and intracellular proteins. Unusual occurrence in perforin. Synaptotagmin and PLC C2s are permuted in sequence with respect to N- and C-terminal beta strands. SMART detects C2 domains using one or both of two profiles.

Pssm-ID: 214577 [Multi-domain] Cd Length: 101 Bit Score: 97.17 E-value: 1.14e-23

                            10        20        30        40        50        60        70        80
                    ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   1558 RLMVHVIEATELKACKPNGKSNPYCEVSMG---SQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDD 1634
Cdd:smart00239    1 TLTVKIISARNLPPKDKGGKSDPYVKVSLDgdpKEKKKTKVVKNTLNPVWNETFEFEVPPPELAELEIEVYDKDRFGRDD 80

                            90       100
                    ....*....|....*....|
gi 312176401   1635 FLGRTEVPVAKIRTEQESKG 1654
Cdd:smart00239   81 FIGQVTIPLSDLLLGGRHEK 100

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 94.68 E-value: 1.98e-23

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11987     2 YRALYPFEARSHDEITIQPGDIVMVDESQTGEPGWLGGELKGKTGWFPANYAEK 55

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 93.12 E-value: 6.25e-23

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11991     1 EYVAMYTYESNEQGDLTFQQGDVILVTKKDGDWWTGTVGDKTGVFPSNYVRP 52

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 90.93 E-value: 3.49e-22

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11989     1 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDMWWFGEVQGQKGWFPKSYVKL 52

C2 domain first and third repeat in Synaptotagmin-like proteins; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains either the first or third repeat in Synaptotagmin-like proteins with a type-I topology.

Pssm-ID: 176037 [Multi-domain] Cd Length: 121 Bit Score: 85.42 E-value: 2.09e-19

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKAcKPN-------GKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQ 1629
Cdd:cd08391     1 GVLRIHVIEAQDLVA-KDKfvgglvkGKSDPYVIVRVGAQTFKSKVIKENLNPKWNEVYEAVVDEVPGQELEIELFDEDP 79

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|.
gi 312176401 1630 fSPDDFLGRTEVPVakirTEQESKGPTTRRLLLHEVPTGEV 1670
Cdd:cd08391    80 -DKDDFLGRLSIDL----GSVEKKGFIDEWLPLEDVKSGRL 115

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 82.97 E-value: 2.71e-19

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   1117 VCQVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETN-GLTGLFPSNYVK 1170
Cdd:smart00326    2 GPQVRALYDYTAQDPDELSFKKGDIITVLEKSDDGWWKGRLGrGKEGLFPSNYVE 56

C2 domain first repeat present in Synaptotagmin-like proteins; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 175990 [Multi-domain] Cd Length: 128 Bit Score: 84.01 E-value: 7.68e-19

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATEL--KACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDD 1634
Cdd:cd04024     1 GVLRVHVVEAKDLaaKDRSGKGKSDPYAILSVGAQRFKTQTIPNTLNPKWNYWCEFPIFSAQNQLLKLILWDKDRFAGKD 80

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401 1635 FLGRTEVPVAKIRTEQESKGPTT------RRLLLHEVPTGEVWVRFDL 1676
Cdd:cd04024    81 YLGEFDIALEEVFADGKTGQSDKwitlksTRPGKTSVVSGEIHLQFSW 128

C2 domain third repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); MCTPs are involved in Ca2+ signaling at the membrane. The cds in this family contain multiple C2 domains as well as a C-terminal PRT domain. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the third C2 repeat, C2C, and has a type-II topology.

Pssm-ID: 176023 [Multi-domain] Cd Length: 119 Bit Score: 83.50 E-value: 1.02e-18

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYqDVLCLTMFDRDQFSPDDFL 1636
Cdd:cd08377     1 GFLQVKVIRASGLAAADIGGKSDPFCVLELVNARLQTHTIYKTLNPEWNKIFTFPIKDIH-DVLEVTVYDEDKDKKPEFL 79

                          90
                  ....*....|.
gi 312176401 1637 GRTEVPVAKIR 1647
Cdd:cd08377    80 GKVAIPLLSIK 90

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 79.43 E-value: 3.48e-18

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGL-TGLFPSNY 1168
Cdd:cd00174     1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDGWWEGELNGGrEGLFPANY 51

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 77.36 E-value: 1.87e-17

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11826     2 VVALYDYTADKDDELSFQEGDIIYVTKKNDDGWYEGVLNGVTGLFPGNYV 51

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 75.84 E-value: 6.70e-17

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11823     4 ALYSYTANREDELSLQPGDIIEVHEKQDDGWWLGELNGKKGIFPATYV 51

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 76.04 E-value: 7.87e-17

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|....
gi 312176401    750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNYVE 802
Cdd:smart00326    5 VRALYDYTAQDPDELSFKKGDIITVLEKS--DDGWWKGRLGrGKEGLFPSNYVE 56

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 75.74 E-value: 8.48e-17

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11805     1 RVQALYDFNPQEPGELEFRRGDIITVLDSSDPDWWKGELRGRVGIFPANYVQ 52

C2 domain present in Arf GTPase Activating Proteins (GAP); ArfGAP is a GTPase activating protein which regulates the ADP ribosylation factor Arf, a member of the Ras superfamily of GTP-binding proteins. The GTP-bound form of Arf is involved in Golgi morphology and is involved in recruiting coat proteins. ArfGAP is responsible for the GDP-bound form of Arf which is necessary for uncoating the membrane and allowing the Golgi to fuse with an acceptor compartment. These proteins contain an N-terminal ArfGAP domain containing the characteristic zinc finger motif (Cys-x2-Cys-x(16,17)-x2-Cys) and C-terminal C2 domain. C2 domains were first identified in Protein Kinase C (PKC). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176003 [Multi-domain] Cd Length: 145 Bit Score: 78.14 E-value: 1.58e-16

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1556 IGRLMVHVIEATELKACKPNGkSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLyQDVLCLTMFDRDQFSPDDF 1635
Cdd:cd04038     1 LGLLKVRVVRGTNLAVRDFTS-SDPYVVLTLGNQKVKTRVIKKNLNPVWNEELTLSVPNP-MAPLKLEVFDKDTFSKDDS 78

                          90       100       110
                  ....*....|....*....|....*....|
gi 312176401 1636 LGRTE------VPVAKIRTEQESKGPTTRR 1659
Cdd:cd04038    79 MGEAEidleplVEAAKLDHLRDTPGGTQIK 108

C2 domain fourth repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the fifth C2 repeat, C2E, and has a type-II topology.

Pssm-ID: 176005 [Multi-domain] Cd Length: 115 Bit Score: 76.45 E-value: 2.53e-16

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKPNGKSNPYCEVSM-GSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDFLG 1637
Cdd:cd04040     1 LTVDVISAENLPSADRNGKSDPFVKFYLnGEKVFKTKTIKKTLNPVWNESFEVPVPSRVRAVLKVEVYDWDRGGKDDLLG 80

                          90
                  ....*....|....
gi 312176401 1638 RTEVPVAKIRTEQE 1651
Cdd:cd04040    81 SAYIDLSDLEPEET 94

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 73.89 E-value: 3.66e-16

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11877     2 VRAKFNFEGTNEDELSFDKGDIITVTQVVEG--GWWEGTLNGKTGWFPSNYVK 52

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 71.96 E-value: 1.73e-15

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11877     1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEGGWWEGTLNGKTGWFPSNYVK 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 71.52 E-value: 2.90e-15

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVkmTTD 1174
Cdd:cd11964     2 KVRAIYDFEAAEDNELTFKAGDIITILDDSDPNWWKGETPQGTGLFPSNFV--TAD 55

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 69.95 E-value: 7.80e-15

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 312176401  1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDGWWEGINTGRTGLVPANYVE 49

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 69.87 E-value: 9.94e-15

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|..
gi 312176401    974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIG-ERTGIFPSNYVR 1023
Cdd:smart00326    5 VRALYDYTAQDPDELSFKKGDIITVLEKsDDGWWKGRLGrGKEGLFPSNYVE 56

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 69.80 E-value: 1.12e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401 1117 VCQViaMYDYMANNEDELNFSKGQLINVMNKDDPD--WWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12142     1 YCRV--LFDYNPVAPDELALKKGDVIEVISKETEDegWWEGELNGRRGFFPDNFVMP 55

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 69.49 E-value: 1.20e-14

                            10        20        30        40        50
                    ....*....|....*....|....*....|....*....|....*....|...
gi 312176401    883 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGR-GWFPKSYVK 933
Cdd:smart00326    4 QVRALYDYTAQDPDELSFKKGDIITVLEKSDdGWWKGRLGRGKeGLFPSNYVE 56

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 68.99 E-value: 2.07e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDG---EWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11842     3 VALYDFAGEQPGDLAFQKGDIITILKKSDsqnDWWTGRIGGREGIFPANYVE 54

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 69.03 E-value: 2.27e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11820     2 KVRALYDFEAAEDNELTFKAGEIITVLDDSDPNWWKGSNHRGEGLFPANFVT 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 68.92 E-value: 2.28e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11875     4 VLFDYEAENEDELTLREGDIVTILSKDceDKGWWKGELNGKRGVFPDNFVE 54

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 68.71 E-value: 2.80e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11949     2 VQALFDFDPQEDGELGFRRGDFIEVMDNSDPNWWKGACHGQTGMFPRNYVT 52

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 68.26 E-value: 3.47e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSI-GERTGIFPSNY 1021
Cdd:cd00174     2 ARALYDYEAQDDDELSFKKGDIITVLEKdDDGWWEGELnGGREGLFPANY 51

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 68.31 E-value: 3.50e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE-TNGLTGLFPSNYV 1169
Cdd:cd11812     2 VVALYDYTANRSDELTIHRGDIIRVLYKDNDNWWFGSlVNGQQGYFPANYV 52

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 68.50 E-value: 3.52e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11972     4 KVVAIYDYTKDKEDELSFQEGAIIYVIKKNDDGWYEGVMNGVTGLFPGNYVE 55

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 68.10 E-value: 3.55e-14

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11772     4 ALYDYEAQHPDELSFEEGDLLYISDKSDPNWWKATCGGKTGLIPSNYV 51

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 68.15 E-value: 3.71e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKD-DPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11804     3 VAKHDFKATAEDELSFKKGSILKVLNMEdDPNWYKAELDGKEGLIPKNYI 52

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 67.87 E-value: 4.30e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNY 800
Cdd:cd00174     2 ARALYDYEAQDDDELSFKKGDIITVLEKD--DDGWWEGELNgGREGLFPANY 51

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 68.06 E-value: 4.74e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11766     1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDGWWRGECNGQVGWFPSNYV 51

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 67.24 E-value: 8.31e-14

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....
gi 312176401   883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:pfam07653    1 YGRVIFDYVGTDKNGLTLKKGDVVKVLGKdNDGWWEGETGGRVGLVPSTAVEEI 54

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 77.10 E-value: 8.73e-14

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  347 SYQKTQEEEPQKKLpvtfEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQL-ELEK 425
Cdd:PTZ00121 1298 AEEKKKADEAKKKA----EEAKKADEAKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEAaEKKK 1373

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  426 RLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQ 505
Cdd:PTZ00121 1374 EEAKKKADAAKKKAEEKKKADEAKKKAEEDKKKADELKKAAAAKKKADEAKKKAEEKKKADEAKKKAEEAKKADEAKKKA 1453

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  506 ISGRLQDVQIRKQTQKTELEVLDKQCD--LEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLSNTPDSGISLLH 583
Cdd:PTZ00121 1454 EEAKKAEEAKKKAEEAKKADEAKKKAEeaKKADEAKKKAEEAKKKADEAKKAAEAKKKADEAKKAEEAKKADEAKKAEEA 1533

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  584 KKSSE--KEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGSMDDCVLQCLLSLLSCLNNLFLLLKELRESYNTQQLA 661
Cdd:PTZ00121 1534 KKADEakKAEEKKKADELKKAEELKKAEEKKKAEEAKKAEEDKNMALRKAEEAKKAEEARIEEVMKLYEEEKKMKAEEAK 1613

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  662 LEQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQD--KTQEEERKAE-- 737
Cdd:PTZ00121 1614 KAEEAKIKAEELKKAEEEKKKVEQLKKKEAEEKKKAEELKKAEEENKIKAAEEAKKAEEDKKKAEEakKAEEDEKKAAea 1693

                         410       420
                  ....*....|....*....|....*...
gi 312176401  738 -AKQSETASALVNYRALYPFEARNHDEM 764
Cdd:PTZ00121 1694 lKKEAEEAKKAEELKKKEAEEKKKAEEL 1721

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 67.27 E-value: 8.99e-14

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11805     4 ALYDFNPQEPGELEFRRGDIITVLDSsDPDWWKGELRGRVGIFPANYVQP 53

Cytoskeletal-regulatory complex EF hand; This is an efhand family from the N-terminal of actin cytoskeleton-regulatory complex END3 and similar proteins from fungi and closely related species.

Pssm-ID: 289529 Cd Length: 104 Bit Score: 67.78 E-value: 2.05e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401    30 FDNLKPSGGYITGDQARTFFLQSGLPAPVLAEIWALSDLNKDGKMDQQEFSIAMKLI 86
Cdd:pfam12763   16 FSGLKPENNKLTGDQVSPVLKNSRLPDDQLAKIWDLADIDSDGKLDFEEFCIAMRLI 72

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 66.00 E-value: 2.22e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11950     1 QVRALYDFEALEDDELGFNSGDVIEVLDSSNPSWWKGRLHGKLGLFPANYVA 52

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 66.20 E-value: 2.31e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11971     1 KVVAIYDYSKDKDDELSFMEGAIIYVIKKNDDGWYEGVCNGVTGLFPGNYVE 52

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 65.86 E-value: 2.38e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12061     2 VRAKFNFQQTNEDELSFSKGDVIHVTRVEEGGWWEGTHNGRTGWFPSNYVR 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 65.81 E-value: 2.72e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVkmTTD 1174
Cdd:cd11963     3 KVRALYDFEAVEDNELTFKHGEIIIVLDDSDANWWKGENHRGVGLFPSNFV--TTD 56

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 65.18 E-value: 3.61e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGR-GWFPKSY 931
Cdd:cd00174     1 YARALYDYEAQDDDELSFKKGDIITVLEKDdDGWWEGELNGGReGLFPANY 51

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 65.30 E-value: 3.65e-13

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 312176401  1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE-TNGLTGLFPS 1166
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKSEDGWWKGRnKGGKEGLIPS 47

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 65.45 E-value: 3.76e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11875     2 ARVLFDYEAENEDELTLREGDIVTILSKDCEDKGWWKGELNGKRGVFPDNFVE 54

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 65.03 E-value: 5.24e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETN-GLTGLFPSNYVKM 1171
Cdd:cd11819     3 KALYDYQAAEDNEISFVEGDIITQIEQIDEGWWLGVNAkGQKGLFPANYVEL 54

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 64.92 E-value: 5.76e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1118 CQVIamYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12057     2 CKVL--FPYEAQNEDELTIKEGDIVTLISKDciDAGWWEGELNGRRGVFPDNFVKL 55

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 64.63 E-value: 6.15e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11772     2 FRALYDYEAQHPDELSFEEGDLLYISDKS--DPNWWKATCGGKTGLIPSNYVE 52

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 64.56 E-value: 6.37e-13

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 312176401   752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEES--EDGWWEGINTGRTGLVPANYVE 49

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 64.67 E-value: 6.58e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11823     3 KALYSYTANREDELSLQPGDIIEVHEK--QDDGWWLGELNGKKGIFPATYVE 52

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 64.44 E-value: 8.77e-13

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11951     2 VQAQYDFSAEDPSQLSFRRGDIIEVLDCPDPNWWRGRISGRVGFFPRNYV 51

Cytoskeletal-regulatory complex EF hand; This is an efhand family from the N-terminal of actin cytoskeleton-regulatory complex END3 and similar proteins from fungi and closely related species.

Pssm-ID: 289529 Cd Length: 104 Bit Score: 65.47 E-value: 1.20e-12

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401   248 KYRQKFNSLDKGmSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMHLT-DM 312
Cdd:pfam12763   11 KYWEIFSGLKPE-NNKLTGDQVSPVLKNSRLPDDQLAKIWDLADIDSDGKLDFEEFCIAMRLIfDL 75

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 64.08 E-value: 1.26e-12

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11961     2 AKALYDYDAAEDNELSFFENDKIINIEFVDDDWWLGECHGSRGLFPSNYVEL 53

C2 domain second repeat present in RasA1 and RasA4; RasA1 and RasA4 are GAP1s (GTPase activating protein 1s ), Ras-specific GAP members, which suppresses Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. Both proteins contain two C2 domains, a Ras-GAP domain, a plextrin homology (PH)-like domain, and a Bruton's Tyrosine Kinase (BTK) zinc binding domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 175991 [Multi-domain] Cd Length: 123 Bit Score: 65.97 E-value: 1.43e-12

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gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDFLG 1637
Cdd:cd04025     1 RLRCHVLEARDLAPKDRNGTSDPFVRVFYNGQTLETSVVKKSCYPRWNEVFEFELMEGADSPLSVEVWDWDLVSKNDFLG 80

                          90
                  ....*....|....*..
gi 312176401 1638 RTEVPVAKIRTEQESKG 1654
Cdd:cd04025    81 KVVFSIQTLQQAKQEEG 97

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 63.59 E-value: 1.48e-12

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gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11959     3 VALYDYQAADDDEISFDPDDIITNIEMIDEGWWRGVCRGKYGLFPANYVEL 53

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 63.51 E-value: 1.49e-12

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gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLI-NVMnKDDPDWWQGETNGL-TGLFPSNYVK 1170
Cdd:cd11825     2 VKALYDYRAQRPDELSFCKHAIItNVE-KEDGGWWRGDYGGKkQKWFPANYVE 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 63.47 E-value: 1.57e-12

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gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLI-NVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11882     1 RARALYACKAEDESELSFEPGQIItNVQPSDEPGWLEGTLNGRTGLIPENYVE 53

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 63.57 E-value: 1.75e-12

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gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILV---TQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11841     4 ALYSFEGQQPCDLSFQAGDRITVltrTDSQFDWWEGRLRGRVGIFPANYV 53

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 63.20 E-value: 2.19e-12

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gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11827     1 QCKALYAYDAQDTDELSFNEGDIIEILKEDPSGWWTGRLRGKEGLFPGNYV 51

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 63.08 E-value: 2.37e-12

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gi 312176401  751 RALYPFEARNHDEMSFSSGDIIqVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11882     3 RALYACKAEDESELSFEPGQII-TNVQPSDEPGWLEGTLNGRTGLIPENYVE 53

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 63.00 E-value: 2.71e-12

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gi 312176401  1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDNDGWWEGETGGRVGLVPSTAVE 52

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 62.83 E-value: 2.92e-12

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gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDP--DWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11842     1 KAVALYDFAGEQPGDLAFQKGDIITILKKSDSqnDWWTGRIGGREGIFPANYVE 54

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 62.66 E-value: 3.03e-12

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gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11803     5 ALYDFEPENEGELGFKEGDIITLTNQIDENWYEGMVNGQSGFFPVNYV 52

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 62.82 E-value: 3.20e-12

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gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11840     3 IALFPYTAQNEDELSFQKGDIINVLSKD--DPDWWRGELNGQTGLFPSNYVE 52

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 62.67 E-value: 3.22e-12

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gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11873     2 VIVEFDYDAEEPDELTLKVGDIITNVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 62.60 E-value: 3.70e-12

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gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE--TNGLTGLFPSNY 1168
Cdd:cd11845     1 IYVALYDYEARTDDDLSFKKGDRLQILDDSDGDWWLARhlSTGKEGYIPSNY 52

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 62.35 E-value: 3.96e-12

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gi 312176401 1118 CQVIamYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11874     2 CKVL--FSYTPQNEDELELKVGDTIEVLGEVEEGWWEGKLNGKVGVFPSNFVKE 53

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 62.32 E-value: 4.09e-12

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gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVT-QKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11772     2 FRALYDYEAQHPDELSFEEGDLLYISdKSDPNWWKATCGGKTGLIPSNYV 51

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 62.53 E-value: 4.52e-12

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gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd12056     5 KALFHYEGTNEDELDFKEGEIILIISKDTGEPGWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 62.01 E-value: 5.27e-12

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gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11824     3 SVLYDYTAQEDDELSISKGDVVAVIEKGEDGWWTVERNGQKGLVPGTYLE 52

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 62.22 E-value: 5.52e-12

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gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12052     1 EAIVEFDYKAQHEDELTITVGDIITKIKKDDGGWWEGEIKGRRGLFPDNFVR 52

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 62.03 E-value: 5.58e-12

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPD----WWQGETNGLTGLFPS 1166
Cdd:cd11762     4 ALYDYEAQSDEELSFPEGAIIRILRKDDNGvddgWWEGEFNGRVGVFPS 52

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 71.12 E-value: 5.77e-12

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  378 ELEKRRQVLmeQQQREAERKAQKEKEEWERKQRELQEQEWK-----KQLELEKRLEKQRELERQREEERRKEIERREAAK 452
Cdd:COG1196   197 ELERQLEPL--ERQAEKAERYRELKEELKELEAELLLLKLReleaeLEELEAELEELEAELEELEAELAELEAELEELRL 274

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  453 QELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCD 532
Cdd:COG1196   275 ELEELELELEEAQAEEYELLAELARLEQDIARLEERRRELEERLEELEEELAELEEELEELEEELEELEEELEEAEEELE 354

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  533 LEIMEIKQLQQELKEYQNKLIYLvpEKQLLNERIKNMQLSntpdsgisllhKKSSEKEELCQRLKEQLDALEKETASKLS 612
Cdd:COG1196   355 EAEAELAEAEEALLEAEAELAEA--EEELEELAEELLEAL-----------RAAAELAAQLEELEEAEEALLERLERLEE 421

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  613 EmdsfnnqlkcgsmddcvlqcllsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDE 692
Cdd:COG1196   422 E----------------------------------LEELEEALAELEEEEEEEEEALEEAAEEEAELEEEEEALLELLAE 467

                         330       340       350       360       370
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  693 AARKAKQGKENLwRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSETASALV 748
Cdd:COG1196   468 LLEEAALLEAAL-AELLEELAEAAARLLLLLEAEADYEGFLEGVKAALLLAGLRGL 522

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 71.16 E-value: 5.83e-12

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   349 QKTQEEEPQKKLPVTFEDKRKANYErgNMELEKRRQVLMEQqqreaERKAQKEKEEWERKQRELQEQEWKKQLELEKRLE 428
Cdd:pfam02463  167 LKRKKKEALKKLIEETENLAELIID--LEELKLQELKLKEQ-----AKKALEYYQLKEKLELEEEYLLYLDYLKLNEERI 239

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   429 KQRELERQREEERRKEIERREAAKQELERQrrlewerlrRQELLSQKTREQEDIvrlSSRKKSLHLELEAVNGKHQQISG 508
Cdd:pfam02463  240 DLLQELLRDEQEEIESSKQEIEKEEEKLAQ---------VLKENKEEEKEKKLQ---EEELKLLAKEEEELKSELLKLER 307

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   509 RLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERiknMQLSNTPDSGISLLHKKSSE 588
Cdd:pfam02463  308 RKVDDEEKLKESEKEKKKAEKELKKEKEEIEELEKELKELEIKREAEEEEEEELEKL---QEKLEQLEEELLAKKKLESE 384

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   589 KEELCQRLKEQLDALEKETASKLSEmdsfnnqlkcgsmddcvlqcllsllsclnnlfllLKELRESYNTQQLALeqlhKI 668
Cdd:pfam02463  385 RLSSAAKLKEEELELKSEEEKEAQL----------------------------------LLELARQLEDLLKEE----KK 426

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   669 KRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKrlqEEKSQDKTQEEERKAEAKQSETASALV 748
Cdd:pfam02463  427 EELEILEEEEESIELKQGKLTEEKEELEKQELKLLKDELELKKSEDLLKE---TQLVKLQEQLELLLSRQKLEERSQKES 503


                   ....*..
gi 312176401   749 NYRALYP 755
Cdd:pfam02463  504 KARSGLK 510

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 61.97 E-value: 5.97e-12

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNK--DDPDWWQ-GETNGLTGLFPSNYV 1169
Cdd:cd11904     3 VQALYPFSSSNDEELNFEKGEVMDVIEKpeNDPEWWKcRKANGQVGLVPKNYV 55

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 61.56 E-value: 7.36e-12

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIqVDEKTVGEpGWLYGSFQ--GKFGWFPCNYVEK 803
Cdd:cd11789     2 YRAMYDYAAADDDEVSFQEGDVI-INVEIIDD-GWMEGTVQrtGQSGMLPANYVEL 55

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 61.71 E-value: 7.43e-12

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD-----DPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12059     4 AVFDYEASAEDELTLRRGDRVEVLSKDsavsgDEGWWTGKINDRVGIFPSNYVTS 58

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 61.62 E-value: 8.09e-12

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:cd12061     3 RAKFNFQQTNEDELSFSKGDVIHVTRVEEG--GWWEGTHNGRTGWFPSNYVREI 54

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 61.56 E-value: 1.03e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNK--DDPDWWQGE-TNGLTGLFPSNYVK 1170
Cdd:cd11767     2 VVALYPFTGENDEELSFEKGERLEIIEKpeDDPDWWKARnALGTTGLVPRNYVE 55

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 61.15 E-value: 1.16e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDpDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11991     1 EYVAMYTYESNEQGDLTFQQGDVILVTKKDG-DWWTGTVGDKTGVFPSNYVRP 52

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 61.17 E-value: 1.29e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12060     4 VKARFNFKQTNEDELSVCKGDIIYVTRVEEGGWWEGTLNGKTGWFPSNYVR 54

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 61.01 E-value: 1.37e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1117 VCQVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11956     1 EVEAVACFDYTGRTAQELSFKRGDVLLLHSKASSDWWRGEHNGMRGLIPHKYI 53

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 61.12 E-value: 1.38e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11803     3 CRALYDFEPENEGELGFKEGDIItltnQIDEN------WYEGMVNGQSGFFPVNYVE 53

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 60.89 E-value: 1.52e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVmNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11838     3 IALYPYESNEPGDLTFNAGDVILV-TKKDGEWWTGTIGDRTGIFPSNYVR 51

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 60.80 E-value: 1.56e-11

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYV 1022
Cdd:cd11826     3 VALYDYTADKDDELSFQEGDIIYVTKKNDDgWYEGVLNGVTGLFPGNYV 51

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 60.22 E-value: 2.68e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd12056     6 ALFHYEGTNEDELDFKEGEIILIISKDtgEPGWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 60.23 E-value: 2.87e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1117 VCQViAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKMT 1172
Cdd:cd12073     1 ICAV-ALYDYQGEGDDEISFDPQETITDIEMVDEGWWKGTCHGHRGLFPANYVELL 55

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 60.06 E-value: 3.27e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE--TNGLTGLFPSNYV 1169
Cdd:cd12006     4 VALYDYEARTEDDLSFHKGEKFQILNSSEGDWWEARslTTGETGYIPSNYV 54

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 59.82 E-value: 3.42e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12046     1 QVVALFSYEASQPEDLEFQKGDVILVLSKVNEDWLEGQCKGKIGIFPSAFVE 52

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 68.46 E-value: 3.44e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   332 FRGGKQVDSVNGTLPSYQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRE 411
Cdd:pfam02463  615 ADEDDKRAKVVEGILKDTELTKLKESAKAKESGLRKGVSLEEGLAEKSEVKASLSELTKELLEIQELQEKAESELAKEEI 694

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   412 LQEQEWKKQLEL-EKRLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKK 490
Cdd:pfam02463  695 LRRQLEIKKKEQrEKEELKKLKLEAEELLADRVQEAQDKINEELKLLKQKIDEEEEEEEKSRLKKEEKEEEKSELSLKEK 774

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   491 SLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQqELKEYQNKLIYLVPEKQLLNERIKNMQ 570
Cdd:pfam02463  775 ELAEEREKTEKLKVEEEKEEKLKAQEEELRALEEELKEEAELLEEEQLLIEQ-EEKIKEEELEELALELKEEQKLEKLAE 853

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   571 LSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDsfNNQLKCGSMDDCVLQCLLSLLSCLNNLFLLLKE 650
Cdd:pfam02463  854 EELERLEEEITKEELLQELLLKEEELEEQKLKDELESKEEKEKEE--KKELEEESQKLNLLEEKENEIEERIKEEAEILL 931

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   651 LRESYNtqqlalEQLHKIKRDKLKEIERKRLEQIQKKKLEDEAarKAKQGKENLwreSIRKEEEEKQKRLQEEKS--QDK 728
Cdd:pfam02463  932 KYEEEP------EELLLEEADEKEKEENNKEEEEERNKRLLLA--KEELGKVNL---MAIEEFEEKEERYNKDELekERL 1000

                          410       420       430
                   ....*....|....*....|....*....|....*....
gi 312176401   729 TQEEERKAEAKQSETASALVNYRALYPFEARNHDEMSFS 767
Cdd:pfam02463 1001 EEEKKKLIRAIIEETCQRLKEFLELFVSINKGWNKVFFY 1039

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 59.95 E-value: 3.47e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD-----DPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd12058     4 ALYDYEASGEDELSLRRGDVVEVLSQDaavsgDDGWWAGKIRHRLGIFPANYV 56

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 60.05 E-value: 3.47e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET-----NGLTGLFPSNYV 1169
Cdd:cd11887     4 VKALYPYESDHEDDLNFDVGQLITVTEEEDADWYFGEYvdsngNTKEGIFPKNFV 58

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 59.98 E-value: 3.47e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1118 CQViaMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12054     3 CKV--LFEYVPQNEDELELKVGDIIDINEEVEEGWWSGTLNGKSGLFPSNFVK 53

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 68.54 E-value: 3.48e-11

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   453 QELERQRRLEWERLRRQELLSQKTREQEDIVRLSS--RKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQ 530
Cdd:TIGR02168  196 NELERQLKSLERQAEKAERYKELKAELRELELALLvlRLEELREELEELQEELKEAEEELEELTAELQELEEKLEELRLE 275

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   531 cDLEI-MEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSS-EKEELCQRLKEQLDALEKETA 608
Cdd:TIGR02168  276 -VSELeEEIEELQKELYALANEISRLEQQKQILRERLANLERQLEELEAQLEELESKLdELAEELAELEEKLEELKEELE 354

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   609 SKLSEMDSFNNQLKcgSMDDCVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIK--RDKLKEIERKRLEQIQK 686
Cdd:TIGR02168  355 SLEAELEELEAELE--ELESRLEELEEQLETLRSKVAQLELQIASLNNEIERLEARLERLEdrRERLQQEIEELLKKLEE 432

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 312176401   687 KKLEDEAARKA--KQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSETAS 745
Cdd:TIGR02168  433 AELKELQAELEelEEELEELQEELERLEEALEELREELEEAEQALDAAERELAQLQARLDS 493

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 68.63 E-value: 3.78e-11

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  354 EEPQKKLpvtfEDKRKANYERGNMELEKRRQVLMEQQQR-------EAERKAQK-EKEEWERKQRELQEQEWKKQL---- 421
Cdd:PTZ00121 1233 EEAKKDA----EEAKKAEEERNNEEIRKFEEARMAHFARrqaaikaEEARKADElKKAEEKKKADEAKKAEEKKKAdeak 1308

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  422 ----------ELEKRLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKS 491
Cdd:PTZ00121 1309 kkaeeakkadEAKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEAAEKKKEEAKKKADAAKKKAE 1388

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  492 LHLELEAVNGKHQQISGRLQDVQiRKQTQKTELEVLDKQCD---------------LEIMEIKQLQQELKEYQNkLIYLV 556
Cdd:PTZ00121 1389 EKKKADEAKKKAEEDKKKADELK-KAAAAKKKADEAKKKAEekkkadeakkkaeeaKKADEAKKKAEEAKKAEE-AKKKA 1466

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  557 PEKQLLNERIKNMQLSNTPDSgislLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGSMDDCVLQCLLS 636
Cdd:PTZ00121 1467 EEAKKADEAKKKAEEAKKADE----AKKKAEEAKKKADEAKKAAEAKKKADEAKKAEEAKKADEAKKAEEAKKADEAKKA 1542

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  637 LLSCLNNLFLLLKELRESYNTQQlaLEQLHKIKRDK---------LKEIERKRLEQIQK-----KKLEDEAARKAKQGKE 702
Cdd:PTZ00121 1543 EEKKKADELKKAEELKKAEEKKK--AEEAKKAEEDKnmalrkaeeAKKAEEARIEEVMKlyeeeKKMKAEEAKKAEEAKI 1620

                         410       420       430       440
                  ....*....|....*....|....*....|....*....|
gi 312176401  703 NlwRESIRKEEEEKQKRLQEEKsqdKTQEEERKAEAKQSE 742
Cdd:PTZ00121 1621 K--AEELKKAEEEKKKVEQLKK---KEAEEKKKAEELKKA 1655

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 59.83 E-value: 4.12e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD-----DPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11876     4 ALFDYDARGEDELTLRRGQPVEVLSKDaavsgDEGWWTGKIGDKVGIFPSNYV 56

Src Homology 3 domain superfamily; Src Homology 3 (SH3) domains are protein interaction domains that bind proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. Thus, they are referred to as proline-recognition domains (PRDs). SH3 domains are less selective and show more diverse specificity compared to other PRDs. They have been shown to bind peptide sequences that lack the PxxP motif; examples include the PxxDY motif of Eps8 and the RKxxYxxY sequence in SKAP55. SH3 domain containing proteins play versatile and diverse roles in the cell, including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies, among others. Many members of this superfamily are adaptor proteins that associate with a number of protein partners, facilitating complex formation and signal transduction.

Pssm-ID: 212690 [Multi-domain] Cd Length: 51 Bit Score: 59.01 E-value: 5.17e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQargkKRQKGWFPASH 1099
Cdd:cd00174     1 YARALYDYEAQDDDELSFKKGDIITVLEKDDDGWWEGELN----GGREGLFPANY 51

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 59.28 E-value: 5.51e-11

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*.
gi 312176401 1124 YDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11901     8 FNYTAEREDELSLVKGTKVIVMEKCSDGWWRGSYNGQVGWFPSNYV 53

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 59.27 E-value: 5.52e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKD-DPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11946     2 EAIAKYDFKATADDELSFKRGDILKVLNEEcDQNWYKAELNGKDGFIPKNYIEM 55

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 58.97 E-value: 6.36e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKD-GEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11840     3 IALFPYTAQNEDELSFQKGDIINVLSKDdPDWWRGELNGQTGLFPSNYVEP 53

C2 domain second repeat present in Synaptotagmin-like proteins 1-4; All Slp members basically share an N-terminal Slp homology domain (SHD) and C-terminal tandem C2 domains (named the C2A domain and the C2B domain) with the SHD and C2 domains being separated by a linker sequence of various length. Slp1/JFC1 and Slp2/exophilin 4 promote granule docking to the plasma membrane. Additionally, their C2A domains are both Ca2+ independent, unlike the case in Slp3 and Slp4/granuphilin in which their C2A domains are Ca2+ dependent. It is thought that SHD (except for the Slp4-SHD) functions as a specific Rab27A/B-binding domain. In addition to Slps, rabphilin, Noc2, and Munc13-4 also function as Rab27-binding proteins. It has been demonstrated that Slp3 and Slp4/granuphilin promote dense-core vesicle exocytosis. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 175987 [Multi-domain] Cd Length: 162 Bit Score: 62.34 E-value: 6.49e-11

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1533 QYIDTEKkkrekaYQARSQKTSGIGRLMVHVIEATELKACKPNGKSNPYCEVSM--GSQSYT---TRTLQDTLNPKWN-- 1605
Cdd:cd04020     9 KYVPPES------EGALKSKKPSTGELHVWVKEAKNLPALKSGGTSDSFVKCYLlpDKSKKSkqkTPVVKKSVNPVWNht 82

                          90       100       110
                  ....*....|....*....|....*....|....
gi 312176401 1606 --FNcQFFIKDLYQDVLCLTMFDRDQFSPDDFLG 1637
Cdd:cd04020    83 fvYD-GVSPEDLSQACLELTVWDHDKLSSNDFLG 115

C2 domain first repeat in Munc13 (mammalian uncoordinated)-like proteins; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176058 [Multi-domain] Cd Length: 153 Bit Score: 62.00 E-value: 7.30e-11

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1543 EKAYQARSQKTSGIGRLMVHVIEATELKACKPNGKSNPYC----------EVSMGSQS-------------------YTT 1593
Cdd:cd08676    14 EALLERVREAEPPIFVLKVTVIEAKGLLAKDVNGFSDPYCmlgivpasreRNSEKSKKrkshrkkavlkdtvpaksiKVT 93

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401 1594 RTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDqfspDDFLGRTEVPVAKIRTEQES 1652
Cdd:cd08676    94 EVKPQTLNPVWNETFRFEVEDVSNDQLHLDIWDHD----DDFLGCVNIPLKDLPSCGLD 148

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 58.88 E-value: 7.84e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11884     3 VAVRAYITRDQTLLSFHKGDVIKLlPKEGPLDPGWLFGTLDGRSGAFPKEYVQ 55

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 58.85 E-value: 7.86e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1118 CQViaMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12055     2 CQV--AFSYLPQNEDELELKVGDIIEVVGEVEEGWWEGVLNGKTGMFPSNFIK 52

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 58.75 E-value: 7.87e-11

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 312176401   975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTG-SIGERTGIFPS 1019
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKsEDGWWKGrNKGGKEGLIPS 47

RhoGEF, Guanine nucleotide exchange factor for Rho/Rac/Cdc42-like GTPases [Signal transduction mechanisms];

Pssm-ID: 227709 [Multi-domain] Cd Length: 1175 Bit Score: 67.22 E-value: 8.50e-11

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1195 ERKRQGYIHELIQTEERYMDDLQLVIEVFQKRMAESGFLTE-ADMALI---FVNWKELIMSNTKLLRALRVRKKTggeKM 1270
Cdd:COG5422   482 EIKRQEAIYEVIYTERDFVKDLEYLRDTWIKPLEESNIIPEnARRNFIkhvFANINEIYAVNSKLLKALTNRQCL---SP 558

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1271 PVQMIGDILAAELSHMQAYIRFCSCQLNGATLLQQKTDEDTDFKEF--LKKLASDPRCKGmpLSSFLLKPMQRITRYPLL 1348
Cdd:COG5422   559 IVNGIADIFLDYVPKFEPFIKYGASQPYAKYEFEREKSVNPNFARFdhEVERLDESRKLE--LDGYLTKPTTRLARYPLL 636

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1349 IRSILENTPQSHVDHSSLKLALERAEELCSQVNEGVREKENsdRLEWIQahvqcegLAEQLIFNSLTNCLG----PRKLL 1424
Cdd:COG5422   637 LEEVLKFTDPDNPDTEDIPKVIDMLREFLSRLNFESGKAEN--RGDLFH-------LNQQLLFKPEYVNLGlndeYRKII 707

                         250       260       270
                  ....*....|....*....|....*....|..
gi 312176401 1425 HSGKLYKTKSNK-------ELHAFLFNDFLLL 1449
Cdd:COG5422   708 FKGVLKRKAKSKtdgslrgDIQFFLLDNMLLF 739

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 58.56 E-value: 9.03e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11806     2 YVAIADFVATDDSQLSFESGDKLLVLRKPSVDWWWAEHNGCCGYIPASHL 51

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 58.80 E-value: 9.23e-11

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11976     3 KARYDFCARDRSELSLKEGDIIKILNKK-GQQGWWRGEIYGRVGWFPANYVEE 54

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 58.86 E-value: 9.64e-11

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQ----VDEktvgepGWLYGSFQ--GKFGWFPCNYVEKV 804
Cdd:cd11935     3 YRAMYDYSAQDEDEVSFRDGDYIVnvqpIDE------GWMYGTVQrtGRTGMLPANYIEFV 57

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 58.48 E-value: 1.01e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNG---LTGLFPSNY 1168
Cdd:cd11821     2 VRALYDCQADNDDELTFSEGEIIVVTGEEDDEWWEGHIEGdpsRRGVFPVSF 53

C2 domain present in the Human neural precursor cell-expressed, developmentally down-regulated 4 (NEDD4) and NEDD4-like (NEDD4L/NEDD42); Nedd4 and Nedd4-2 are two of the nine members of the Human Nedd4 family. All vertebrates appear to have both Nedd4 and Nedd4-2 genes. They are thought to participate in the regulation of epithelial Na+ channel (ENaC) activity. They also have identical specificity for ubiquitin conjugating enzymes (E2). Nedd4 and Nedd4-2 are composed of a C2 domain, 2-4 WW domains, and a ubiquitin ligase Hect domain. Their WW domains can bind PPxY (PY) or LPSY motifs, and in vitro studies suggest that WW3 and WW4 of both proteins bind PY motifs in the key substrates, with WW3 generally exhibiting higher affinity. Most Nedd4 family members, especially Nedd4-2, also have multiple splice variants, which might play different roles in regulating their substrates. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175999 [Multi-domain] Cd Length: 133 Bit Score: 60.83 E-value: 1.11e-10

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKPNGKSNPYCEVSM-------GSQSYTTRTLQDTLNPKWnfNCQFFIK-DLYQDVLCLTMFDRDQF 1630
Cdd:cd04033     2 LRVKVLAGIDLAKKDIFGASDPYVKISLydpdgngEIDSVQTKTIKKTLNPKW--NEEFFFRvNPREHRLLFEVFDENRL 79

                          90       100       110
                  ....*....|....*....|....*....|....*
gi 312176401 1631 SPDDFLGRTEVPVAKIRTEQE--SKGPTTRRLLLH 1663
Cdd:cd04033    80 TRDDFLGQVEVPLNNLPTETPgnERRYTFKDYLLR 114

Src homology 3 domains; Src homology 3 (SH3) domains bind to target proteins through sequences containing proline and hydrophobic amino acids. Pro-containing polypeptides may bind to SH3 domains in 2 different binding orientations.

Pssm-ID: 214620 [Multi-domain] Cd Length: 56 Bit Score: 58.32 E-value: 1.17e-10

                            10        20        30        40        50        60
                    ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   1042 KPEIAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELqargKKRQKGWFPASHVK 1101
Cdd:smart00326    1 EGPQVRALYDYTAQDPDELSFKKGDIITVLEKSDDGWWKGRL----GRGKEGLFPSNYVE 56

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 58.44 E-value: 1.19e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1122 AMYDYM-ANNEDELNFSKGQLINVMNKDDP-----DWWQGET-NGLTGLFPSNYV 1169
Cdd:cd11771     4 ALYDFTpENPEMELSLKKGDIVAVLSKTDPlgrdsEWWKGRTrDGRIGWFPSNYV 58

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 58.25 E-value: 1.27e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12142     2 CRVLFDYNPVAPDELALKKGDVIEVISKETEDEGWWEGELNGRRGFFPDNFVM 54

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 58.09 E-value: 1.54e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11877     1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEgGWWEGTLNGKTGWFPSNYVKE 53

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 57.93 E-value: 1.60e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNG-LTGLFPSNYVK 1170
Cdd:cd11969     2 VKALYDYRAKRSDELSFCKGALIHNVSKETGGWWKGDYGGkVQHYFPSNYVE 53

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 66.32 E-value: 1.97e-10

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  350 KTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQ--EQEWKKQLELEKRL 427
Cdd:PTZ00121 1348 AKAEAEAAADEAEAAEEKAEAAEKKKEEAKKKADAAKKKAEEKKKADEAKKKAEEDKKKADELKkaAAAKKKADEAKKKA 1427

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  428 EKQRELERQREEERRKEIERREAAKQELERQRRLEWERLrrqellSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQIS 507
Cdd:PTZ00121 1428 EEKKKADEAKKKAEEAKKADEAKKKAEEAKKAEEAKKKA------EEAKKADEAKKKAEEAKKADEAKKKAEEAKKKADE 1501

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  508 GRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKL----------IYLVPEKQLLNERIKNMQLSNTPDS 577
Cdd:PTZ00121 1502 AKKAAEAKKKADEAKKAEEAKKADEAKKAEEAKKADEAKKAEEKKkadelkkaeeLKKAEEKKKAEEAKKAEEDKNMALR 1581

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  578 GISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKcgsMDDCVLQCLLSLLSCLNNLFLLLKELRESYNT 657
Cdd:PTZ00121 1582 KAEEAKKAEEARIEEVMKLYEEEKKMKAEEAKKAEEAKIKAEELK---KAEEEKKKVEQLKKKEAEEKKKAEELKKAEEE 1658

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  658 QQLALEQL-HKIKRDKLKEIERKRLEQIQKKKLE-----DEAARKAKQGK-----ENLWRESIRKEEEEKQKRLQEEKSq 726
Cdd:PTZ00121 1659 NKIKAAEEaKKAEEDKKKAEEAKKAEEDEKKAAEalkkeAEEAKKAEELKkkeaeEKKKAEELKKAEEENKIKAEEAKK- 1737

                         410
                  ....*....|....*.
gi 312176401  727 dKTQEEERKAEAKQSE 742
Cdd:PTZ00121 1738 -EAEEDKKKAEEAKKD 1752

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 57.68 E-value: 2.07e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT-----GLFPSNY 1168
Cdd:cd11883     2 VVALYDFTPKSKNQLSFKAGDIIYVLNKDPSGWWDGVIISSSgkvkrGWFPSNY 55

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 57.51 E-value: 2.27e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPD-WWQGETNGLTGLFPSNY 1168
Cdd:cd11778     2 VEALYDYEAQGDDEISIRVGDRIAVIRGDDGSgWTYGEINGVKGLFPTSY 51

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 57.38 E-value: 2.30e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDpDWWQGETNGLT-GLFPSNYVKM 1171
Cdd:cd11837     1 TATALYPWRAKKENHLSFAKGDIITVLEQQE-MWWFGELEGGEeGWFPKSYVKE 53

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 57.42 E-value: 2.41e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11827     3 KALYAYDAQDTDELSFNEGDIIEILKEDPS--GWWTGRLRGKEGLFPGNYVEK 53

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 57.40 E-value: 2.53e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDP--DWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11841     1 EVTALYSFEGQQPCDLSFQAGDRITVLTRTDSqfDWWEGRLRGRVGIFPANYVS 54

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 57.33 E-value: 2.84e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11826     3 VALYDYTADKDDELSFQEGDIIYVTKKN--DDGWYEGVLNGVTGLFPGNYVE 52

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 57.13 E-value: 3.19e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11833     2 YVALYKFKPQENEDLEMRPGDKITLLDdSNEDWWKGKIEDRVGFFPANFV 51

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 56.84 E-value: 3.59e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11986     2 FVALYRFKALEKDDLDFHPGERITVIDdSNEEWWRGKIGEKTGYFPMNFI 51

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 56.96 E-value: 3.61e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11781     3 RALYPFKAQSAKELSLKKGDIIYIRRQIDKNWYEGEHNGRVGIFPASYVEI 53

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 56.93 E-value: 3.87e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEktVGEPGWLYGSFQGKFGWFPCNYVEKVLS 806
Cdd:cd12060     5 KARFNFKQTNEDELSVCKGDIIYVTR--VEEGGWWEGTLNGKTGWFPSNYVREIKS 58

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 56.72 E-value: 3.99e-10

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11817     2 AVALYDFTGETEEDLSFQRGDRILVTEHLDAEWSRGRLNGREGIFPRAF 50

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 56.97 E-value: 4.00e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTG----SIGER-TGIFPSNYVRP 1024
Cdd:cd11887     5 KALYPYESDHEDDLNFDVGQLITVTEEeDADWYFGeyvdSNGNTkEGIFPKNFVEV 60

C2 domain first repeat; fungal group; C2 domains were first identified in Protein Kinase C (PKC). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176006 [Multi-domain] Cd Length: 111 Bit Score: 58.81 E-value: 4.00e-10

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPN-GKSNPYCEVSM---GSQSYTTRTLQDTLNPKWNfnCQFFIKDLYQDV-----LCLTMFDR 1627
Cdd:cd04041     1 GVLVVTIHRATDLPKADFGtGSSDPYVTASFakfGKPLYSTRIIRKDLNPVWE--ETWFVLVTPDEVkagerLSCRLWDS 78

                          90
                  ....*....|....*....
gi 312176401 1628 DQFSPDDFLGRTEVPVAKI 1646
Cdd:cd04041    79 DRFTADDRLGRVEIDLKEL 97

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 56.48 E-value: 4.61e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNK-DDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11830     3 KARYDFCARDMRELSLKEGDVVKIYNKkGQQGWWRGEINGRIGWFPSTYVE 53

C2 domain first repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 176009 [Multi-domain] Cd Length: 124 Bit Score: 58.72 E-value: 4.85e-10

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1556 IGRLMVHVIEATELKAC-KPNGKSNPYCEVSMGSQSYT--TRTLQDTLNPKWNfNCQFFIKDLYQDVLCLTMFDRDQFSP 1632
Cdd:cd04044     1 IGVLAVTIKSARGLKGSdIIGGTVDPYVTFSISNRRELarTKVKKDTSNPVWN-ETKYILVNSLTEPLNLTVYDFNDKRK 79

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401 1633 DDFLGRTEVPVAKIRTEQESKGPTTrRLLLHEVPTGEvwVRFDLQLF 1679
Cdd:cd04044    80 DKLIGTAEFDLSSLLQNPEQENLTK-NLLRNGKPVGE--LNYDLRFF 123

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 56.64 E-value: 5.06e-10

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11809     3 TAQFDYTGRSERELSFKKGDSLTLYRQVSDDWWRGQLNGQDGLVPHKYI 51

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 56.54 E-value: 5.49e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVEK 803
Cdd:cd11780     2 YRALYSYTPQNEDELELREGDIVYVMEKC--DDGWFVGTSErtGLFGTFPGNYVAR 55

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 56.53 E-value: 5.58e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1118 CQVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGL-FPSNYVK 1170
Cdd:cd11970     4 CAVKALFDYKAQREDELTFTKNAIIQNVEKQEGGWWRGDYGGKKQLwFPSNYVE 57

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 56.22 E-value: 5.68e-10

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11786     4 ALYNYEGKEPGDLSFKKGDIILLRKRIDENWYHGECNGKQGFFPASYVQ 52

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 56.57 E-value: 5.78e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPD-WWQGE-TNGLTGLFPSNYV 1169
Cdd:cd11763     1 KVRALYDFDSQPSGELSLRAGEVLTITRQDVGDgWLEGRnSRGEVGLFPSSYV 53

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 56.34 E-value: 6.06e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE-TNGLTGLFPSNYVKM 1171
Cdd:cd11962     3 VVLYDYEKDEDNEIELVEGEIVTNIEMVDEDWWMGTnSKGESGLFPSNYVEL 54

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 56.20 E-value: 6.10e-10

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 932
Cdd:cd11823     4 ALYSYTANREDELSLQPGDIIEVHEKQDDgWWLGELNGKKGIFPATYV 51

Second Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212945 Cd Length: 62 Bit Score: 56.53 E-value: 6.15e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401 1121 IAMYDY----MANN----EDELNFSKGQLINVMNKDDPD-WWQGETNGLTGLFPSNYVK 1170
Cdd:cd12012     3 VALFDYdpltMSPNpdaaEEELPFKEGQLIKVYGDKDADgFYLGEINGRRGLVPCNMVS 61

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 56.12 E-value: 6.25e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11766     2 AVVKFNYEAQREDELSLRKGDRVLVLEKS--SDGWWRGECNGQVGWFPSNYVTE 53

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 56.55 E-value: 6.28e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIqVDEKTVGEpGWLYGSFQ--GKFGWFPCNYVEKV 804
Cdd:cd11933     4 FRAMYDYRAADDDEVSFKDGDTI-VNVQTIDE-GWMYGTVQrtGKTGMLPANYVEAI 58

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 56.06 E-value: 6.51e-10

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 312176401   751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYG-SFQGKFGWFPC 798
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKS--EDGWWKGrNKGGKEGLIPS 47

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 56.10 E-value: 6.70e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPD---WWQGETNGLTGLFPSNYVK 1170
Cdd:cd11894     2 VKALYDYEGQTDDELSFPEGAIIRILNKENQDddgFWEGEFNGRIGVFPSVLVE 55

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 55.98 E-value: 8.13e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGE------WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11876     2 WTALFDYDARGEDELTLRRGQPVEVLSKDAAvsgdegWWTGKIGDKVGIFPSNYVAP 58

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 55.87 E-value: 8.16e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET-NGLTGLFPSNYVKM 1171
Cdd:cd11960     2 ARALYDYQAADDTEISFDPGDIITDIEQIDEGWWRGTGpDGTYGLFPANYVEL 54

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 55.75 E-value: 8.32e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARGKKRQKGWFPASH 1099
Cdd:cd11883     1 VVVALYDFTPKSKNQLSFKAGDIIYVLNKDPSGWWDGVIISSSGKVKRGWFPSNY 55

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 55.89 E-value: 8.39e-10

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVM-NKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11843     2 VRALYDYEGQESDELSFKAGDILTKLeEEDEQGWCKGRLDGRVGLYPANYV 52

C2 domain fourth repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the fourth C2 repeat, C2D, and has a type-II topology.

Pssm-ID: 175984 [Multi-domain] Cd Length: 135 Bit Score: 58.32 E-value: 1.11e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWN----FNcQFFI----KDLYQD--VLCLTMFDR 1627
Cdd:cd04017     2 QLRAYIYQARDLLAADKSGLSDPFARVSFLNQSQETEVIKETLSPTWDqtliFD-EVELygspEEIAQNppLVVVELFDQ 80

                          90       100       110       120       130
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1628 DQFSPDDFLGRTE-VPVAKIRTEQESKGPttrrLLLHEV-----PTGEVWVRFDL 1676
Cdd:cd04017    81 DSVGKDEFLGRSVaKPLVKLDLEEDFPPK----LQWFPIykggqSAGELLAAFEL 131

C2 domain first repeat contained in Rab3-interacting molecule (RIM) proteins; RIMs are believed to organize specialized sites of the plasma membrane called active zones. They also play a role in controlling neurotransmitter release, plasticity processes, as well as memory and learning. RIM contains an N-terminal zinc finger domain, a PDZ domain, and two C-terminal C2 domains (C2A, C2B). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology and do not bind Ca2+.

Pssm-ID: 175997 [Multi-domain] Cd Length: 125 Bit Score: 57.64 E-value: 1.16e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM---GSQSYT--TRTLQDTLNPKWNfncQFFI------KDLYQDVLCLTMF 1625
Cdd:cd04031    16 SQLIVTVLQARDLPPRDDGSLRNPYVKVYLlpdRSEKSKrrTKTVKKTLNPEWN---QTFEysnvrrETLKERTLEVTVW 92

                          90       100
                  ....*....|....*....|
gi 312176401 1626 DRDQFSPDDFLGRTEVPVAK 1645
Cdd:cd04031    93 DYDRDGENDFLGEVVIDLAD 112

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 55.42 E-value: 1.17e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11781     3 RALYPFKAQSAKELSLKKGDIIyirrQIDKN------WYEGEHNGRVGIFPASYVE 52

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 55.81 E-value: 1.21e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYV 1169
Cdd:cd12007     4 VALYDYEARTTEDLSFKKGERFQIINNTEGDWWEARSiaTGKNGYIPSNYV 54

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 55.33 E-value: 1.23e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKtVGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11830     4 ARYDFCARDMRELSLKEGDVVKIYNK-KGQQGWWRGEINGRIGWFPSTYVEE 54

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 55.34 E-value: 1.25e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11856     2 YVAIADYEAQGDDEISLQEGEVVEVLEK--NDSGWWYVRKGDKEGWVPASYLEP 53

C2A domain first repeat present in Synaptotagmin 7; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 7, a member of class 2 synaptotagmins, is located in presynaptic plasma membranes in neurons, dense-core vesicles in endocrine cells, and lysosomes in fibroblasts. It has been shown to play a role in regulation of Ca2+-dependent lysosomal exocytosis in fibroblasts and may also function as a vesicular Ca2+-sensor. It is distinguished from the other synaptotagmins by having over 12 splice forms. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176032 [Multi-domain] Cd Length: 125 Bit Score: 57.72 E-value: 1.27e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKPNGKSNPYCEVSM---GSQSYTTRTLQDTLNPKWNFNCQF--F-IKDLYQDVLCLTMFDRDQFSP 1632
Cdd:cd08386    18 LTLKILKAVELPAKDFSGTSDPFVKIYLlpdKKHKLETKVKRKNLNPHWNETFLFegFpYEKLQQRVLYLQVLDYDRFSR 97

                          90
                  ....*....|....*....
gi 312176401 1633 DDFLGRTEVPVAKIRTEQE 1651
Cdd:cd08386    98 NDPIGEVSLPLNKVDLTEE 116

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 2; GRAF2, also called Rho GTPase activating protein 10 (ARHGAP10) or PS-GAP, is a GAP with activity towards Cdc42 and RhoA. It regulates caspase-activated p21-activated protein kinase-2 (PAK-2p34). GRAF2 interacts with PAK-2p34, leading to its stabilization and decrease of cell death. It is highly expressed in skeletal muscle, and is involved in alpha-catenin recruitment at cell-cell junctions. GRAF2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212998 [Multi-domain] Cd Length: 54 Bit Score: 55.38 E-value: 1.31e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQvDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12065     3 KAVYPCEAEHSSELSFEVGAIFE-DVTLSREPGWLEGTLNGKRGLIPENYVE 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 55.12 E-value: 1.33e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQ--VDEKtvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11843     3 RALYDYEGQESDELSFKAGDILTklEEED---EQGWCKGRLDGRVGLYPANYVE 53

C2 domain second repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); MCTPs are involved in Ca2+ signaling at the membrane. MCTP is composed of a variable N-terminal sequence, three C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176022 [Multi-domain] Cd Length: 116 Bit Score: 57.27 E-value: 1.45e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1563 VIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDFLGRTEVP 1642
Cdd:cd08376     6 LVEGKNLPPMDDNGLSDPYVKFRLGNEKYKSKVCSKTLNPQWLEQFDLHLFDDQSQILEIEVWDKDTGKKDEFIGRCEID 85


                  ....*...
gi 312176401 1643 VAKIRTEQ 1650
Cdd:cd08376    86 LSALPREQ 93

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 62.83 E-value: 1.52e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   336 KQVDSVNGTLPSYQKTQ---EEEPQKKLPVTFEDKRKANYERGNM-ELEKRRQVL-MEQQQREAERKAQKEKEEWERKQR 410
Cdd:pfam17380  221 KEVQGMPHTLAPYEKMErrkESFNLAEDVTTMTPEYTVRYNGQTMtENEFLNQLLhIVQHQKAVSERQQQEKFEKMEQER 300

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   411 ELQEQEwKKQLELEKRLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKk 490
Cdd:pfam17380  301 LRQEKE-EKAREVERRRKLEEAEKARQAEMDRQAAIYAEQERMAMERERELERIRQEERKRELERIRQEEIAMEISRMR- 378

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   491 slhlELEAVNGKHQQISGRL-QDVQ-IRKQT-QKTELEVLDKQCDLEIMEIKQLQQELKEYQnkliylvpEKQLLNERIK 567
Cdd:pfam17380  379 ----ELERLQMERQQKNERVrQELEaARKVKiLEEERQRKIQQQKVEMEQIRAEQEEARQRE--------VRRLEEERAR 446

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   568 NMQlsntpdsgisLLHKKSSEKEELCQRLKEQldalEKETASKLSEMDsfnnqlkcgsmddcvlqcllsllsclnnlfll 647
Cdd:pfam17380  447 EME----------RVRLEEQERQQQVERLRQQ----EEERKRKKLELE-------------------------------- 480

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   648 lKELREsyntQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDeaaRKAKQGKENLWRESIRKEEEEKQKRLQEEKSQD 727
Cdd:pfam17380  481 -KEKRD----RKRAEEQRRKILEKELEERKQAMIEEERKRKLLE---KEMEERQKAIYEEERRREAEEERRKQQEMEERR 552

                          410
                   ....*....|....
gi 312176401   728 KTQEEERKAEAKQS 741
Cdd:pfam17380  553 RIQEQMRKATEERS 566

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 55.06 E-value: 1.67e-09

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11786     4 ALYNYEGKEPGDLSFKKGDIILLRKRiDENWYHGECNGKQGFFPASYV 51

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 55.06 E-value: 1.75e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11786     2 AKALYNYEGKEPGDLSFKKGDIILLRKRiDENWYHGECNGKQGFFPASYVQ 52

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 55.06 E-value: 1.79e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDD--PDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11836     4 ALYAFEARNPDEISFQPGDIIQVDESQVaePGWLAGELKGKTGWFPANYV 53

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 55.02 E-value: 2.04e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLI-NVMNKDDpDWWQG--ETNGLTGLFPSNYVKM 1171
Cdd:cd11789     1 RYRAMYDYAAADDDEVSFQEGDVIiNVEIIDD-GWMEGtvQRTGQSGMLPANYVEL 55

C2 domain found in Rab11-family interacting proteins (FIP) class I; Rab GTPases recruit various effector proteins to organelles and vesicles. Rab11-family interacting proteins (FIPs) are involved in mediating the role of Rab11. FIPs can be divided into three classes: class I FIPs (Rip11a, Rip11b, RCP, and FIP2) which contain a C2 domain after N-terminus of the protein, class II FIPs (FIP3 and FIP4) which contain two EF-hands and a proline rich region, and class III FIPs (FIP1) which exhibits no homology to known protein domains. All FIP proteins contain a highly conserved, 20-amino acid motif at the C-terminus of the protein, known as Rab11/25 binding domain (RBD). Class I FIPs are thought to bind to endocytic membranes via their C2 domain, which interacts directly with phospholipids. Class II FIPs do not have any membrane binding domains leaving much to speculate about the mechanism involving FIP3 and FIP4 interactions with endocytic membranes. The members in this CD are class I FIPs. The exact function of the Rab11 and FIP interaction is unknown, but there is speculation that it involves the role of forming a targeting complex that recruits a group of proteins involved in membrane transport to organelles. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176064 [Multi-domain] Cd Length: 126 Bit Score: 57.08 E-value: 2.11e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1561 VHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLY-----QDVLCLTMFDRDQFSPDDF 1635
Cdd:cd08682     3 VTVLQARGLLCKGKSGTNDAYVIIQLGKEKYSTSVKEKTTSPVWKEECSFELPGLLsgngnRATLQLTVMHRNLLGLDKF 82

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 312176401 1636 LGRTEVPvakIRTEQESKG-PTTRRLLLHEVPT------GEVWVRF 1674
Cdd:cd08682    83 LGQVSIP---LNDLDEDKGrRRTRWFKLESKPGkddkerGEIEVDI 125

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 54.73 E-value: 2.26e-09

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYV 1022
Cdd:cd11827     4 ALYAYDAQDTDELSFNEGDIIEILKEDPSgWWTGRLRGKEGLFPGNYV 51

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 62.68 E-value: 2.28e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   392 REAERKAQKEKEEWERKQRELQEQEWKKQLEL-EKRLEKQrelerqreeerrkeierreaAKQELERQRRLEWERLRRQE 470
Cdd:pfam02463  166 RLKRKKKEALKKLIEETENLAELIIDLEELKLqELKLKEQ--------------------AKKALEYYQLKEKLELEEEY 225

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   471 LL--SQKTREQEDIVRLSsrkkslhlELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCD-LEIMEIKQLQQELKE 547
Cdd:pfam02463  226 LLylDYLKLNEERIDLLQ--------ELLRDEQEEIESSKQEIEKEEEKLAQVLKENKEEEKEKkLQEEELKLLAKEEEE 297

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   548 YQNKLIYLVPEKQLLNERIKNMQLSNT-PDSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLkcgsm 626
Cdd:pfam02463  298 LKSELLKLERRKVDDEEKLKESEKEKKkAEKELKKEKEEIEELEKELKELEIKREAEEEEEEELEKLQEKLEQLE----- 372

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   627 DDCVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHkiKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWR 706
Cdd:pfam02463  373 EELLAKKKLESERLSSAAKLKEEELELKSEEEKEAQLLLE--LARQLEDLLKEEKKEELEILEEEEESIELKQGKLTEEK 450

                          330       340       350
                   ....*....|....*....|....*....|....*.
gi 312176401   707 ESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSE 742
Cdd:pfam02463  451 EELEKQELKLLKDELELKKSEDLLKETQLVKLQEQL 486

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 54.56 E-value: 2.36e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11805     1 RVQALYDFNPQEPGELEFRRGDIITVLDSsDPDWWKGELRGRVGIFPANYVQ 52

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 54.56 E-value: 2.38e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11805     3 QALYDFNPQEPGELEFRRGDIITVLDSS--DPDWWKGELRGRVGIFPANYVQP 53

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 54.62 E-value: 2.41e-09

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDII----QVDEktvgepGWLYGSFQ--GKFGWFPCNYVEKV 804
Cdd:cd11934     5 YRAVYDYNAADEDEVSFQDGDTIvnvqQIDD------GWMYGTVErtGDTGMLPANYVEAI 59

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 54.41 E-value: 2.44e-09

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNY 1021
Cdd:cd11817     3 VALYDFTGETEEDLSFQRGDRILVTEHlDAEWSRGRLNGREGIFPRAF 50

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 54.59 E-value: 2.69e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG-ETNGLTGLFPSNYVK 1170
Cdd:cd11768     1 IVVALYDFQPIEPGDLPLEKGEEYVVLDDSNEHWWRArDKNGNEGYIPSNYVT 53

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 62.39 E-value: 2.76e-09

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   378 ELEKRRQVLMEQQQREAERKAQKEkEEWERKQRELQEQEWKKQlELEKRLEKQRELERQREeerrkeierreAAKQELER 457
Cdd:TIGR02169  720 EIEKEIEQLEQEEEKLKERLEELE-EDLSSLEQEIENVKSELK-ELEARIEELEEDLHKLE-----------EALNDLEA 786

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   458 QRRLEWERLRRQELLSQKT--REQEDIVR-LSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQcdle 534
Cdd:TIGR02169  787 RLSHSRIPEIQAELSKLEEevSRIEARLReIEQKLNRLTLEKEYLEKEIQELQEQRIDLKEQIKSIEKEIENLNGK---- 862

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   535 imeIKQLQQELKEYQNKLIYLVPEKQLLNERIKNM--QLSNTpDSGISLLHKKSSEKEELCQRLKEQLDALEKEtaskLS 612
Cdd:TIGR02169  863 ---KEELEEELEELEAALRDLESRLGDLKKERDELeaQLREL-ERKIEELEAQIEKKRKRLSELKAKLEALEEE----LS 934

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   613 EMDSFNNQLkcgsmddcvlqcllsllsclnnlflllkelrESYNTQQLALEQLHKIKRDKLKEIERkrLEQIQKKKLEde 692
Cdd:TIGR02169  935 EIEDPKGED-------------------------------EEIPEEELSLEDVQAELQRVEEEIRA--LEPVNMLAIQ-- 979

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|....
gi 312176401   693 aarkakqgkenlwresirkEEEEKQKRLQEEKSQDKTQEEERKA 736
Cdd:TIGR02169  980 -------------------EYEEVLKRLDELKEKRAKLEEERKA 1004

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 54.41 E-value: 2.76e-09

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11818     4 ALYDFTGENEDELSFKAGDIITELESIDEEWMSGELRGKSGIFPKNF 50

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 54.62 E-value: 2.87e-09

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*.
gi 312176401 1124 YDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11902     7 FAYVAEREDELSLVKGSRVTVMEKCSDGWWRGSYNGQIGWFPSNYV 52

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 62.26 E-value: 2.96e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  364 FEDKRKANYERGN--MELEKRRQVLMEQQQREAERKAQ--KEKEEWERKQRELQEQ--EWKKQLE---------LEKRLE 428
Cdd:COG1196   283 LEEAQAEEYELLAelARLEQDIARLEERRRELEERLEEleEELAELEEELEELEEEleELEEELEeaeeeleeaEAELAE 362

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  429 KQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISG 508
Cdd:COG1196   363 AEEALLEAEAELAEAEEELEELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEALAELEEEEEEEEE 442

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  509 RLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLsntPDSGISLLHKKSSE 588
Cdd:COG1196   443 ALEEAAEEEAELEEEEEALLELLAELLEEAALLEAALAELLEELAEAAARLLLLLEAEADYEG---FLEGVKAALLLAGL 519

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  589 K---------------------------------------EELCQRLKEQLDA------LEKETASKLSEMDSFNNQLKC 623
Cdd:COG1196   520 RglagavavligveaayeaaleaalaaalqnivveddevaAAAIEYLKAAKAGratflpLDKIRARAALAAALARGAIGA 599

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  624 GSMDDCVLQCLLSLLSCLNNLFLL---------------LKELRESYNTQQLALEQLH----KIKRDKLKEIERKRLEQI 684
Cdd:COG1196   600 AVDLVASDLREADARYYVLGDTLLgrtlvaarleaalrrAVTLAGRLREVTLEGEGGSaggsLTGGSRRELLAALLEAEA 679

                         410       420       430       440       450       460       470       480
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  685 QKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSETASALVNYRALYPFEARNHDEM 764
Cdd:COG1196   680 ELEELAERLAEEELELEEALLAEEEEERELAEAEEERLEEELEEEALEEQLEAEREELLEELLEEEELLEEEALEELPEP 759

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 54.39 E-value: 3.24e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1047 QVTSAYAASGTEQLSLAPGQLILILKKNT--SGWWQGELQARgkkrqKGWFPASHV 1100
Cdd:cd12142     3 RVLFDYNPVAPDELALKKGDVIEVISKETedEGWWEGELNGR-----RGFFPDNFV 53

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 53.90 E-value: 3.59e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11796     1 QARVLQDLSAQLDEELDLREGDVVTITGILDKGWFRGELNGRRGIFPEGFV 51

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 54.06 E-value: 3.61e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11950     4 ALYDFEALEDDELGFNSGDVIEVLDSsNPSWWKGRLHGKLGLFPANYVAP 53

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 54.18 E-value: 3.65e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQV---DEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd12058     2 WTALYDYEASGEDELSLRRGDVVEVlsqDAAVSGDDGWWAGKIRHRLGIFPANYV 56

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 53.86 E-value: 3.70e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11877     4 AKFNFEGTNEDELSFDKGDIITVTQVvEGGWWEGTLNGKTGWFPSNYVKE 53

C2 domain first repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); plant subset; MCTPs are involved in Ca2+ signaling at the membrane. Plant-MCTPs are composed of a variable N-terminal sequence, four C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 175989 [Multi-domain] Cd Length: 127 Bit Score: 56.19 E-value: 3.92e-09

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFI---KDLYQDVLCLTMFDRDQFSP-D 1633
Cdd:cd04022     1 KLVVEVVDAQDLMPKDGQGSSSAYVELDFDGQKKRTRTKPKDLNPVWNEKLVFNVsdpSRLSNLVLEVYVYNDRRSGRrR 80

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....
gi 312176401 1634 DFLGRTEVPVAKIRTEQESKG---PTTRRLLLHEVpTGEVWVRF 1674
Cdd:cd04022    81 SFLGRVRISGTSFVPPSEAVVqryPLEKRGLFSRV-RGEIGLKV 123

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 53.82 E-value: 4.61e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGG-----RGWFPKSY 931
Cdd:cd11883     3 VALYDFTPKSKNQLSFKAGDIIYVLNKDPSgWWDGVIISSsgkvkRGWFPSNY 55

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 53.68 E-value: 5.34e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11950     3 RALYDFEALEDDELGFNSGDVIEVLDSS--NPSWWKGRLHGKLGLFPANYVA 52

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 53.50 E-value: 5.36e-09

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYV 1022
Cdd:cd11823     4 ALYSYTANREDELSLQPGDIIEVHEKQDDgWWLGELNGKKGIFPATYV 51

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 53.75 E-value: 5.70e-09

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12057     3 KVLFPYEAQNEDELTIKEGDIVTLISKDCIDAGWWEGELNGRRGVFPDNFVK 54

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 53.47 E-value: 5.78e-09

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                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEktvgepGWLYGSF-QGKFGWFPCNYVE 802
Cdd:cd11819     3 KALYDYQAAEDNEISFVEGDIItqieQIDE------GWWLGVNaKGQKGLFPANYVE 53

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 53.41 E-value: 5.85e-09

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                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYVR 1023
Cdd:cd11985     2 YVALYKFLPQENNDLPLQPGDRVMVVDDSNEdWWKGKSGDRVGFFPANFVQ 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 53.28 E-value: 6.33e-09

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                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMN-KDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11948     1 EAVALYSFQATESDELPFQKGDILKILNmEDDQNWYKAELQGREGYIPKNYIKV 54

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 53.27 E-value: 6.47e-09

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                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd12046     3 VALFSYEASQPEDLEFQKGDVILVLSKvNEDWLEGQCKGKIGIFPSAFVED 53

Src homology 3 domain of Blk Protein Tyrosine Kinase; Blk is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. It is expressed specifically in B-cells and is involved in pre-BCR (B-cell receptor) signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212942 [Multi-domain] Cd Length: 54 Bit Score: 53.28 E-value: 6.64e-09

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                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGEWW------TGsigeRTGIFPSNYVRP 1024
Cdd:cd12009     2 VIAQYDFVPSNERDLQLKKGEKLQVLKSDGEWWlaksltTG----KEGYIPSNYVAR 54

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 53.37 E-value: 6.71e-09

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                   ....*....|....*....|....*....|....*....|....*....|..
gi 312176401   974 YIALYSYSSVEPGDLTFTEGEEILVTQKD-GEWWTGSIGERTGIFPSNYVRP 1024
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDnDGWWEGETGGRVGLVPSTAVEE 53

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 53.48 E-value: 6.75e-09

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gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11977     5 ARYNFAARDMRELSLREGDVVRIYSRIGGDQGWWKGETNGRIGWFPSTYVEE 56

C2 domain first repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); MCTPs are involved in Ca2+ signaling at the membrane. MCTP is composed of a variable N-terminal sequence, three C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 176007 [Multi-domain] Cd Length: 121 Bit Score: 55.36 E-value: 6.88e-09

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gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCEVSM-GSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLcLTMFDRDQFSPDDFL 1636
Cdd:cd04042     1 QLDIHLKEGRNLAARDRGGTSDPYVKFKYgGKTVYKSKTIYKNLNPVWDEKFTLPIEDVTQPLY-IKVFDYDRGLTDDFM 79

                          90
                  ....*....|....
gi 312176401 1637 GRTEVPVAKIRTEQ 1650
Cdd:cd04042    80 GSAFVDLSTLELNK 93

C2 domain third repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the third C2 repeat, C2C, and has a type-II topology.

Pssm-ID: 176010 [Multi-domain] Cd Length: 120 Bit Score: 55.29 E-value: 7.41e-09

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gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM-GSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQdVLCLTMFDRDQFSPDDF 1635
Cdd:cd04045     1 GVLRLHIRKANDLKNLEGVGKIDPYVRVLVnGIVKGRTVTISNTLNPVWDEVLYVPVTSPNQ-KITLEVMDYEKVGKDRS 79

                          90
                  ....*....|.
gi 312176401 1636 LGRTEVPVAKI 1646
Cdd:cd04045    80 LGSVEINVSDL 90

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 53.09 E-value: 7.61e-09

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gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11920     5 AVYDFKAQTSKELSFKKGDTVYILRKIDQNWYEGEHHGRVGIFPISYVE 53

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 53.14 E-value: 8.04e-09

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvgEPGWLYGSFQ-GKFGWFPCNYV 801
Cdd:cd11837     2 ATALYPWRAKKENHLSFAKGDIITVLEQ---QEMWWFGELEgGEEGWFPKSYV 51

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 53.03 E-value: 8.34e-09

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gi 312176401  976 ALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11803     5 ALYDFEPENEGELGFKEGDIItLTNQIDENWYEGMVNGQSGFFPVNYV 52

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 52.89 E-value: 8.57e-09

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gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11813     1 RAKALLDFERHDDDELGFRKNDIITIISQKdEHCWVGELNGLRGWFPAKFVEL 53

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 52.79 E-value: 8.59e-09

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gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11816     3 VARFDFEGEQEDELSFSEGDVITLKEYVGEEWAKGELNGKIGIFPLNFV 51

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 53.11 E-value: 9.24e-09

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                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1119 QVIAMYDymANNEDELNFSKGQLINVMNKDDPDWWQGETNG-----LTGLFPSNYVKM 1171
Cdd:cd11839     3 QVIAPFT--ATAENQLSLAVGQLVLVRKKSPSGWWEGELQArgkkrQIGWFPANYVKL 58

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 53.20 E-value: 9.35e-09

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                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT-------GLFPSNY 1168
Cdd:cd11773     4 ALYDYEPQTEDELTIQEDDILYLLEKSDDDWWKVKLKVNSsdddepvGLVPATY 57

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 53.02 E-value: 9.94e-09

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                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11929     5 ALCNYRGHNPGDLKFNKGDVILLRRQLDENWYLGEINGVSGIFPASSVEV 54

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 52.80 E-value: 1.06e-08

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gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11840     4 ALFPYTAQNEDELSFQKGDIINVLSKDDpDWWRGELNGQTGLFPSNYVEP 53

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 52.64 E-value: 1.09e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11856     1 SYVAIADYEAQGDDEISLQEGEVVEVLEKNDSGWWYVRKGDKEGWVPASYLE 52

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 52.81 E-value: 1.09e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1122 AMYDYMANNED--ELNFSKGQLINVmnKDDP-DWWQGE-TNGLTGLFPSNYVKM 1171
Cdd:cd11855     4 ALYPYDASPDDpnELSFEKGEILEV--SDTSgKWWQARkSNGETGICPSNYLQL 55

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 52.69 E-value: 1.10e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPSNYVK 1170
Cdd:cd11780     4 ALYSYTPQNEDELELREGDIVYVMEKCDDGWFVGtsERTGLFGTFPGNYVA 54

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 52.53 E-value: 1.10e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11949     2 VQALFDFDPQEDGELGFRRGDFIEVMDNSDpNWWKGACHGQTGMFPRNYVT 52

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 52.90 E-value: 1.11e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQV---DEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11876     4 ALFDYDARGEDELTLRRGQPVEVlskDAAVSGDEGWWTGKIGDKVGIFPSNYV 56

C2 domain present in cytosolic PhosphoLipase A2 (cPLA2); A single copy of the C2 domain is present in cPLA2 which releases arachidonic acid from membranes initiating the biosynthesis of potent inflammatory mediators such as prostaglandins, leukotrienes, and platelet-activating factor. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members of this cd have a type-II topology.

Pssm-ID: 176001 [Multi-domain] Cd Length: 119 Bit Score: 54.96 E-value: 1.14e-08

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCEVSMGSQS---YTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFsPDD 1634
Cdd:cd04036     1 LLTVRVLRATNITKGDLLSTPDCYVELWLPTASdekKRTKTIKNSINPVWNETFEFRIQSQVKNVLELTVMDEDYV-MDD 79

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....
gi 312176401 1635 FLGRTEVPVAKIRTEQeskgPTTRRLLLHEVPTGEVWVRFDLQL 1678
Cdd:cd04036    80 HLGTVLFDVSKLKLGE----KVRVTFSLNPQGKEELEVEFLLEL 119

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 52.73 E-value: 1.22e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVgePGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12076     3 YTVIYPYTARDQDEINLEKGAVVEVIQKNL--EGWWKIRYQGKEGWAPASYLKK 54

Calcium binding and coiled-coil domain (CALCOCO1) like; Proteins found in this family are similar to the coiled-coil transcriptional coactivator protein coexpressed by Mus musculus (CoCoA/CALCOCO1). This protein binds to a highly conserved N-terminal domain of p160 coactivators, such as GRIP1, and thus enhances transcriptional activation by a number of nuclear receptors. CALCOCO1 has a central coiled-coil region with three leucine zipper motifs, which is required for its interaction with GRIP1 and may regulate the autonomous transcriptional activation activity of the C-terminal region.

Pssm-ID: 462303 [Multi-domain] Cd Length: 488 Bit Score: 59.52 E-value: 1.30e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   378 ELEKRRQVLME-----QQQREAERKAQK-EKEEWERKQRELQEQEWKKQLELEKRLEKQrELERQREEERRKEIERREAA 451
Cdd:pfam07888   38 ECLQERAELLQaqeaaNRQREKEKERYKrDREQWERQRRELESRVAELKEELRQSREKH-EELEEKYKELSASSEELSEE 116

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   452 KQELERQrrlewerlrrQELLSQKTRE-QEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKq 530
Cdd:pfam07888  117 KDALLAQ----------RAAHEARIRElEEDIKTLTQRVLERETELERMKERAKKAGAQRKEEEAERKQLQAKLQQTEE- 185

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   531 cdleimEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLSNTPdsgislLHKKSSEKEELCQRLK---EQLDALEKET 607
Cdd:pfam07888  186 ------ELRSLSKEFQELRNSLAQRDTQVLQLQDTITTLTQKLTT------AHRKEAENEALLEELRslqERLNASERKV 253

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   608 A---SKLSEMDSFNNQLKcGSMDDCVLQCLLSLLSCLNNLfLLLKELRESYNTQQLALEQLHKIKRDKLKEIER------ 678
Cdd:pfam07888  254 EglgEELSSMAAQRDRTQ-AELHQARLQAAQLTLQLADAS-LALREGRARWAQERETLQQSAEADKDRIEKLSAelqrle 331

                          330       340       350       360       370       380       390
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401   679 KRL--EQIQKKKLEDEAARKAKQGKENLwRESIRKEEEEK--QKRLQEEKSQDKTQEEE-----RKAEAKQSETASA 746
Cdd:pfam07888  332 ERLqeERMEREKLEVELGREKDCNRVQL-SESRRELQELKasLRVAQKEKEQLQAEKQElleyiRQLEQRLETVADA 407

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 52.53 E-value: 1.32e-08

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11961     4 ALYDYDAAEDNELSFFENDKIInIEFVDDDWWLGECHGSRGLFPSNYV 51

Src homology 3 domain of Slit-Robo GTPase Activating Proteins 1, 2, and 3; srGAP1, also called Rho GTPase-Activating Protein 13 (ARHGAP13), is a Cdc42- and RhoA-specific GAP and is expressed later in the development of central nervous system tissues. srGAP2 is expressed in zones of neuronal differentiation. It plays a role in the regeneration of neurons and axons. srGAP3, also called MEGAP (MEntal disorder associated GTPase-Activating Protein), is a Rho GAP with activity towards Rac1 and Cdc42. It impacts cell migration by regulating actin and microtubule cytoskeletal dynamics. The association between srGAP3 haploinsufficiency and mental retardation is under debate. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212888 [Multi-domain] Cd Length: 53 Bit Score: 52.64 E-value: 1.35e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11955     1 EAIAKFDYVGRSARELSFKKGASLLLYHRASDDWWEGRHNGIDGLVPHQYI 51

Src homology 3 domain of Alpha Spectrin; Spectrin is a major structural component of the red blood cell membrane skeleton and is important in erythropoiesis and membrane biogenesis. It is a flexible, rope-like molecule composed of two subunits, alpha and beta, which consist of many spectrin-type repeats. Alpha and beta spectrin associate to form heterodimers and tetramers; spectrin tetramer formation is critical for red cell shape and deformability. Defects in alpha spectrin have been associated with inherited hemolytic anemias including hereditary spherocytosis (HSp), hereditary elliptocytosis (HE), and hereditary pyropoikilocytosis (HPP). Alpha spectrin contains a middle SH3 domain and a C-terminal EF-hand binding motif in addition to multiple spectrin repeats. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212742 [Multi-domain] Cd Length: 53 Bit Score: 52.49 E-value: 1.37e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11808     2 VVALYDYQEKSPREVSMKKGDILTLLNSSNKDWWKVEVNDRQGFVPAAYVK 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 52.71 E-value: 1.38e-08

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILV-TQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11963     6 ALYDFEAVEDNELTFKHGEIIIVlDDSDANWWKGENHRGVGLFPSNFV 53

C2 domain first repeat present in Rabphilin and Double C2 domain; Rabphilin is found neurons and in neuroendrocrine cells, while Doc2 is found not only in the brain but in tissues, including mast cells, chromaffin cells, and osteoblasts. Rabphilin and Doc2s share highly homologous tandem C2 domains, although their N-terminal structures are completely different: rabphilin contains an N-terminal Rab-binding domain (RBD),7 whereas Doc2 contains an N-terminal Munc13-1-interacting domain (MID). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176000 [Multi-domain] Cd Length: 123 Bit Score: 54.60 E-value: 1.43e-08

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCE-----VSMGSQSYTTRTLQDTLNPKWNFNCQFF---IKDLYQDVLCLTMFDRDQ 1629
Cdd:cd04035    16 ALHCTIIRAKGLKAMDANGLSDPYVKlnllpGASKATKLRTKTVHKTRNPEFNETLTYYgitEEDIQRKTLRLLVLDEDR 95

                          90       100
                  ....*....|....*....|....
gi 312176401 1630 FSpDDFLGRTEVPVAKIRTEQESK 1653
Cdd:cd04035    96 FG-NDFLGETRIPLKKLKPNQTKQ 118

Src homology 3 domain of Blk Protein Tyrosine Kinase; Blk is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. It is expressed specifically in B-cells and is involved in pre-BCR (B-cell receptor) signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212942 [Multi-domain] Cd Length: 54 Bit Score: 52.51 E-value: 1.44e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMnKDDPDWWQGE--TNGLTGLFPSNYV 1169
Cdd:cd12009     2 VIAQYDFVPSNERDLQLKKGEKLQVL-KSDGEWWLAKslTTGKEGYIPSNYV 52

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 52.72 E-value: 1.49e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPD-----WWQG--ETNGLTGLFPSNYVK 1170
Cdd:cd11790     5 VRATHDYTAEDTDELTFEKGDVILVIPFDDPEeqdegWLMGvkESTGCRGVFPENFTE 62

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 52.32 E-value: 1.51e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVT-QKDGEWWTGSI---GERTGIFPSNY 1021
Cdd:cd11821     4 ALYDCQADNDDELTFSEGEIIVVTgEEDDEWWEGHIegdPSRRGVFPVSF 53

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 52.29 E-value: 1.56e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDG-EWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11996     4 IAMYDYTANNEDELSFSKGQLINVLNKDDpDWWQGEINGVTGLFPSNYVK 53

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 52.38 E-value: 1.69e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPD---WWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11807     2 VVYALFDYEAENGDELSFREGDELTVLRKGDDDeteWWWARLNDKEGYVPRNLLGL 57

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 52.37 E-value: 1.75e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNK--DDPDWWQGE-TNGLTGLFPSNYV 1169
Cdd:cd11903     3 VQTLYPFSSVTEEELNFEKGETMEVIEKpeNDPEWWKCKnSRGQVGLVPKNYV 55

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 52.18 E-value: 1.89e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1115 HAVcqviAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11815     1 HAV----VLHDFPAEHSDDLSLNSGEIVYLLEKIDTEWYRGKCKNTTGIFPANHVK 52

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 52.00 E-value: 1.90e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11828     2 AEALWDHVTMDPEELGFKAGDVIEVLDMSDKDWWWGSIRDEEGWFPASFVRL 53

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 52.08 E-value: 1.93e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGE------WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd12059     2 WTAVFDYEASAEDELTLRRGDRVEVLSKDSAvsgdegWWTGKINDRVGIFPSNYVTS 58

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 51.99 E-value: 2.02e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDD----PDWWQGETNGLTGLFPSNY 1168
Cdd:cd11800     1 YYYALYTFEARSPGELSVTEGQVVTVLEKHDlkgnPEWWLVEDRGKQGYVPSNY 54

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 51.74 E-value: 2.11e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd12047     1 RMVAQHDYSAQGPEDLEFSQGDTIDILSEVNQEWLEGHCDGRIGIFPKCFA 51

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 51.99 E-value: 2.15e-08

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVT-QKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd12061     4 AKFNFQQTNEDELSFSKGDVIHVTrVEEGGWWEGTHNGRTGWFPSNYVR 52

Src homology 3 domain of Nitric Oxide Synthase TRaffic INducer; Nostrin is expressed in endothelial and epithelial cells and is involved in the regulation, trafficking and targeting of endothelial NOS (eNOS). It facilitates the endocytosis of eNOS by coordinating the functions of dynamin and the Wiskott-Aldrich syndrome protein (WASP). Increased expression of Nostrin may be correlated to preeclampsia. Nostrin contains an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212757 [Multi-domain] Cd Length: 53 Bit Score: 51.96 E-value: 2.22e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQGELqaRGKkrqKGWFPASHV 1100
Cdd:cd11823     7 SYTANREDELSLQPGDIIEVHEKQDDGWWLGEL--NGK---KGIFPATYV 51

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 51.87 E-value: 2.33e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 932
Cdd:cd11964     2 KVRAIYDFEAAEDNELTFKAGDIITILDDSDpNWWKGETPQGTGLFPSNFV 52

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 51.94 E-value: 2.41e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGWLYG-SFQGKFGWFPCNYVE 802
Cdd:cd11763     2 VRALYDFDSQPSGELSLRAGEVLTITRQDVGD-GWLEGrNSRGEVGLFPSSYVE 54

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 51.87 E-value: 2.67e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPD-WWQGETNGLTGLFPSNYVK 1170
Cdd:cd11976     4 ARYDFCARDRSELSLKEGDIIKILNKKGQQgWWRGEIYGRVGWFPANYVE 53

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 58.88 E-value: 2.77e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   388 EQQQREAERKAQKEKEEWERKQRELQEQEWKKQlELEKRLEKQRELERQREEERRKEIERreaaKQELERQRrlewerlr 467
Cdd:TIGR04523  362 QRELEEKQNEIEKLKKENQSYKQEIKNLESQIN-DLESKIQNQEKLNQQKDEQIKKLQQE----KELLEKEI-------- 428

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   468 rQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKE 547
Cdd:TIGR04523  429 -ERLKETIIKNNSEIKDLTNQDSVKELIIKNLDNTRESLETQLKVLSRSINKIKQNLEQKQKELKSKEKELKKLNEEKKE 507

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   548 YQNKLIYLVPEKQLLNERIKnmQLSNTPDSGISLLHKKSSEKEELCQRLKEqlDALEKETASKLSEMDSfnnqlkcgsmd 627
Cdd:TIGR04523  508 LEEKVKDLTKKISSLKEKIE--KLESEKKEKESKISDLEDELNKDDFELKK--ENLEKEIDEKNKEIEE----------- 572

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   628 dcvlqcllsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQKK-KLEDEaARKAKqgKENLWR 706
Cdd:TIGR04523  573 --------------------LKQTQKSLKKKQEEKQELIDQKEKEKKDLIKEIEEKEKKIsSLEKE-LEKAK--KENEKL 629

                          330       340
                   ....*....|....*....|....
gi 312176401   707 ESIRKEEEEKQKRLQEEKSQDKTQ 730
Cdd:TIGR04523  630 SSIIKNIKSKKNKLKQEVKQIKET 653

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 51.38 E-value: 2.88e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11949     4 ALFDFDPQEDGELGFRRGDFIeVMDNSDPNWWKGACHGQTGMFPRNYVTP 53

Src Homology 3 domain of Amphiphysin and related domains; Amphiphysins function primarily in endocytosis and other membrane remodeling events. They exist in several isoforms and mammals possess two amphiphysin proteins from distinct genes. Amphiphysin I proteins, enriched in the brain and nervous system, contain domains that bind clathrin, Adaptor Protein complex 2 (AP2), dynamin, and synaptojanin. They function in synaptic vesicle endocytosis. Human autoantibodies to amphiphysin I hinder GABAergic signaling and contribute to the pathogenesis of paraneoplastic stiff-person syndrome. Some amphiphysin II isoforms, also called Bridging integrator 1 (Bin1), are localized in many different tissues and may function in intracellular vesicle trafficking. In skeletal muscle, Bin1 plays a role in the organization and maintenance of the T-tubule network. Mutations in Bin1 are associated with autosomal recessive centronuclear myopathy. Amphiphysins contain an N-terminal BAR domain with an additional N-terminal amphipathic helix (an N-BAR), a variable central domain, and a C-terminal SH3 domain. The SH3 domain of amphiphysins bind proline-rich motifs present in binding partners such as dynamin, synaptojanin, and nsP3. It also belongs to a subset of SH3 domains that bind ubiquitin in a site that overlaps with the peptide binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212724 [Multi-domain] Cd Length: 64 Bit Score: 51.94 E-value: 2.90e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQV---DEKTVGEPGWLYGSFQ--GKFGWFPCNYVEKV 804
Cdd:cd11790     6 RATHDYTAEDTDELTFEKGDVILVipfDDPEEQDEGWLMGVKEstGCRGVFPENFTERI 64

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 51.53 E-value: 2.93e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGS--IGERTGIFPSNYV 1022
Cdd:cd12004     3 VALYPYDGIHEDDLSFKKGEKLKVIEEHGEWWKARslTTKKEGFIPSNYV 52

C2A domain first repeat present in Synaptotagmins 1, 5, 6, 9, and 10; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 1, a member of class 1 synaptotagmins, is located in the brain and endocranium and localized to the synaptic vesicles and secretory granules. It functions as a Ca2+ sensor for fast exocytosis as do synaptotagmins 5, 6, and 10. It is distinguished from the other synaptotagmins by having an N-glycosylated N-terminus. Synaptotagmins 5, 6, and 10, members of class 3 synaptotagmins, are located primarily in the brain and localized to the active zone and plasma membrane. They is distinguished from the other synaptotagmins by having disulfide bonds at its N-terminus. Synaptotagmin 6 also regulates the acrosome reaction, a unique Ca2+-regulated exocytosis, in sperm. Synaptotagmin 9, a class 5 synaptotagmins, is located in the brain and localized to the synaptic vesicles. It is thought to be a Ca2+-sensor for dense-core vesicle exocytosis. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176031 [Multi-domain] Cd Length: 124 Bit Score: 53.81 E-value: 2.95e-08

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM---GSQSYTTRTLQDTLNPKwnFNCQFFIKDLYQDV----LCLTMFDRDQ 1629
Cdd:cd08385    16 NQLTVGIIQAADLPAMDMGGTSDPYVKVYLlpdKKKKFETKVHRKTLNPV--FNETFTFKVPYSELgnktLVFSVYDFDR 93

                          90       100
                  ....*....|....*....|..
gi 312176401 1630 FSPDDFLGRTEVPVAKIRTEQE 1651
Cdd:cd08385    94 FSKHDLIGEVRVPLLTVDLGHV 115

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 51.70 E-value: 3.00e-08

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11820     4 RALYDFEAAEDNELTFKAGEIITVLDDS--DPNWWKGSNHRGEGLFPANFVTA 54

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 51.56 E-value: 3.05e-08

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                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPD-WWQGETNGLTGLFPSNYVK 1170
Cdd:cd11978     4 IARYDFCARDMRELSLLKGDVVKIYTKMSTNgWWRGEVNGRVGWFPSTYVE 54

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 51.38 E-value: 3.10e-08

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gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLI-NVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12053     1 EYIVEYDYDAVHEDELTIRVGEIIrNVKKLEEEGWLEGELNGRRGMFPDNFVK 53

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 51.49 E-value: 3.20e-08

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                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11927     5 ALYNYEGKEPGDLKFSKGDIIILRRQVDENWYHGEVNGIHGFFPTNFVQI 54

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 51.31 E-value: 3.51e-08

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                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11820     2 KVRALYDFEAAEDNELTFKAGEIITVLDDSdPNWWKGSNHRGEGLFPANFVT 53

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 51.27 E-value: 3.57e-08

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                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11842     3 VALYDFAGEQPGDLAFQKGDIITILKKSDSQNDWWTGRIGGREGIFPANYVE 54

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 51.25 E-value: 3.64e-08

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                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEktvgepGWLYGSFQ-GKFGWFPCNYVE 802
Cdd:cd11960     3 RALYDYQAADDTEISFDPGDIItdieQIDE------GWWRGTGPdGTYGLFPANYVE 53

Src homology 3 domain of Signal Transducing Adaptor Molecules; STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. There are two vertebrate STAMs, STAM1 and STAM2, which may be functionally redundant; vertebrate STAMs contain ITAM motifs. They are part of the endosomal sorting complex required for transport (ESCRT-0). STAM2 deficiency in mice did not cause any obvious abnormality, while STAM1 deficiency resulted in growth retardation. Loss of both STAM1 and STAM2 in mice proved lethal, indicating that STAMs are important for embryonic development. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212754 [Multi-domain] Cd Length: 54 Bit Score: 51.31 E-value: 3.80e-08

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                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11820     5 ALYDFEAAEDNELTFKAGEIITVLDdSDPNWWKGSNHRGEGLFPANFV 52

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 51.38 E-value: 3.83e-08

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                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11870     1 QVVALHRYEAQGPEDLGFREGDTIDVLSEVNEAWLEGHSDGRVGIFPKCFVV 52

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 51.48 E-value: 3.84e-08

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gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKD----DPDWWQGETNGLT-GLFPSNYVK 1170
Cdd:cd11864     3 RAEYDFVAESEDELSFRAGDKLRLAPKElqprVRGWLLATVDGQKiGLVPANYVK 57

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 51.53 E-value: 3.98e-08

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gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYVKM 1171
Cdd:cd11916     6 ALYSYAPQNDDELELRDGDIVDVMEKCDDGWFVGTSrrTKQFGTFPGNYVKL 57

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 50.96 E-value: 4.03e-08

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gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11813     4 ALLDFERHDDDELGFRKNDIITIISQKDEHCWVGELNGLRGWFPAKFVEL 53

Src Homology 3 domain of Membrane Protein, Palmitoylated (or MAGUK p55 subfamily member) proteins; The MPP/p55 subfamily of MAGUK (membrane-associated guanylate kinase) proteins includes at least eight vertebrate members (MPP1-7 and CASK), four Drosophila proteins (Stardust, Varicose, CASK and Skiff), and other similar proteins; they all contain one each of the core of three domains characteristic of MAGUK proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, most members except for MPP1 contain N-terminal L27 domains and some also contain a Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. CASK has an additional calmodulin-dependent kinase (CaMK)-like domain at the N-terminus. Members of this subfamily are scaffolding proteins that play important roles in regulating and establishing cell polarity, cell adhesion, and synaptic targeting and transmission, among others. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212796 Cd Length: 61 Bit Score: 51.43 E-value: 4.06e-08

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                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1122 AMYDYMANNEDE-------LNFSKGQLINVMNKDDPDWWQ----GETNGLTGLFPS 1166
Cdd:cd11862     4 ALFDYDPEEDPLipckeagLSFKKGDILQIVNQDDPNWWQarkvGDPNGRAGLIPS 59

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 51.13 E-value: 4.32e-08

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gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11996     5 AMYDYTANNEDELSFSKGQLINVLNKDDpDWWQGEINGVTGLFPSNYVKM 54

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 51.17 E-value: 4.40e-08

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gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVdekTVGEP--GWLYGSFQ--GKFGWFPCNYVEK 803
Cdd:cd11779     4 KALYPHAAGGETQLSFEEGDVITL---LGPEPrdGWHYGENErsGRRGWFPIAYTEP 57

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 51.18 E-value: 4.42e-08

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                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKF-GWFPCNYVEK 803
Cdd:cd11825     3 KALYDYRAQRPDELSFCKHAIITNVEKEDG--GWWRGDYGGKKqKWFPANYVEE 54

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 51.31 E-value: 4.49e-08

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQV---DEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd12059     4 AVFDYEASAEDELTLRRGDRVEVlskDSAVSGDEGWWTGKINDRVGIFPSNYV 56

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 51.17 E-value: 4.49e-08

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                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGE--VHGGRGWFPKSYVK 933
Cdd:cd11779     2 RVKALYPHAAGGETQLSFEEGDVITLLgpEPRDGWHYGEneRSGRRGWFPIAYTE 56

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 50.95 E-value: 4.50e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11951     4 AQYDFSAEDPSQLSFRRGDIIEVLDCpDPNWWRGRISGRVGFFPRNYVHP 53

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 51.15 E-value: 4.61e-08

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  747 LVNYRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVEKV 804
Cdd:cd11916     1 AYSYQALYSYAPQNDDELELRDGDIVDVMEKC--DDGWFVGTSRrtKQFGTFPGNYVKLL 58

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 51.12 E-value: 4.82e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  751 RALYPFEARNHD-EMSFSSGDIIQVDEKT--VGEP-GWLYGSFQ-GKFGWFPCNYVE 802
Cdd:cd11771     3 RALYDFTPENPEmELSLKKGDIVAVLSKTdpLGRDsEWWKGRTRdGRIGWFPSNYVE 59

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 58.14 E-value: 4.97e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   378 ELEKRRQVLMEQQQREAErkAQKEKEEWERKQRELQEQEWKKQLELEkrlekqrelerqreeerrKEIERREAAKQELER 457
Cdd:TIGR02168  678 EIEELEEKIEELEEKIAE--LEKALAELRKELEELEEELEQLRKELE------------------ELSRQISALRKDLAR 737

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   458 QRRLEWERLRRQELLSQKTREQED-IVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIM 536
Cdd:TIGR02168  738 LEAEVEQLEERIAQLSKELTELEAeIEELEERLEEAEEELAEAEAEIEELEAQIEQLKEELKALREALDELRAELTLLNE 817

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   537 EIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLSntpdsgISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDS 616
Cdd:TIGR02168  818 EAANLRERLESLERRIAATERRLEDLEEQIEELSED------IESLAAEIEELEELIEELESELEALLNERASLEEALAL 891

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   617 FNNQLkcgsmddcvlqcllsllsclnnlFLLLKELREsYNTQQLALEQLHKIKRDKLKEIERkRLEQIQKkkledeaarK 696
Cdd:TIGR02168  892 LRSEL-----------------------EELSEELRE-LESKRSELRRELEELREKLAQLEL-RLEGLEV---------R 937

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|...
gi 312176401   697 AKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAK 739
Cdd:TIGR02168  938 IDNLQERLSEEYSLTLEEAEALENKIEDDEEEARRRLKRLENK 980

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 50.82 E-value: 5.35e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE-TNGLTGLFPSNYV 1169
Cdd:cd11758     3 VRALFDFPGNDDEDLPFKKGEILTVIRKPEEQWWNARnSEGKTGMIPVPYV 53

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 50.88 E-value: 5.53e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE--TNGLTGLFPSNYV 1169
Cdd:cd12008     3 VALYDYESRTETDLSFKKGERLQIVNNTEGDWWLAHslTTGQTGYIPSNYV 53

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 50.49 E-value: 6.12e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  752 ALYPFEARNHDEMSFSSGDII----QVDEktvgepGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11959     4 ALYDYQAADDDEISFDPDDIItnieMIDE------GWWRGVCRGKYGLFPANYVE 52

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 50.54 E-value: 6.13e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT-GLFPSNYV 1169
Cdd:cd11774     1 QAKALYDYDKQTEEELSFNEGDTLDVYDDSDSDWILVGFNGTQfGFVPANYI 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 50.56 E-value: 6.52e-08

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDpDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11947     4 GKFDFTASGEDELSFKKGDVLKILSSDD-IWFKAELNGEEGYVPKNFV 50

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 50.41 E-value: 6.62e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGElqaRGKKRQKGWFPASHV 1100
Cdd:cd11793     2 VQCVHAYTAQQPDELTLEEGDVVNVLRKMPDGWYEGE---RLRDGERGWFPSSYT 53

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 50.73 E-value: 6.87e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVEKV 804
Cdd:cd11918     4 YKAVYQYRPQNEDELELREGDRVDVMQQC--DDGWFVGVSRrtQKFGTFPGNYVAPV 58

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 57.76 E-value: 7.09e-08

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   350 KTQEEEPQKKLpvtfeDKRKANYERGN---MELEKRRQVLmeQQQREAERKAQKEKEEWERKQREL-------QEQEWKK 419
Cdd:TIGR02168  171 KERRKETERKL-----ERTRENLDRLEdilNELERQLKSL--ERQAEKAERYKELKAELRELELALlvlrleeLREELEE 243

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   420 QLELEKRLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLrrQELLSQKTREQEDIVRLSSRKKSLHLELEAV 499
Cdd:TIGR02168  244 LQEELKEAEEELEELTAELQELEEKLEELRLEVSELEEEIEELQKEL--YALANEISRLEQQKQILRERLANLERQLEEL 321

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   500 NGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLvpEKQLLNERIKNMQLSNTpdsgI 579
Cdd:TIGR02168  322 EAQLEELESKLDELAEELAELEEKLEELKEELESLEAELEELEAELEELESRLEEL--EEQLETLRSKVAQLELQ----I 395

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   580 SLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFN---NQLKCGSMDDCVLQCLLSLLSCLNNLFLLLKELRESYN 656
Cdd:TIGR02168  396 ASLNNEIERLEARLERLEDRRERLQQEIEELLKKLEEAElkeLQAELEELEEELEELQEELERLEEALEELREELEEAEQ 475

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   657 TQQLALEQLHKI--KRDKLKEIERkRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEE 714
Cdd:TIGR02168  476 ALDAAERELAQLqaRLDSLERLQE-NLEGFSEGVKALLKNQSGLSGILGVLSELISVDEG 534

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 50.34 E-value: 7.21e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11873     1 EVIVEFDYDAEEPDELTLKVGDIITnVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 50.27 E-value: 7.23e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWW------TGsigeRTGIFPSNY 1021
Cdd:cd11845     2 YVALYDYEARTDDDLSFKKGDRLQILDDsDGDWWlarhlsTG----KEGYIPSNY 52

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 50.53 E-value: 7.36e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVgePGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12016     3 YITTQAYKAENEDEIGFETGVVVEVIQKNL--DGWWKIRYQGKEGWAPATYLKK 54

Src Homology 3 domain of C-terminal Src kinase; CSK is a cytoplasmic (or nonreceptor) tyr kinase containing the Src homology domains, SH3 and SH2, N-terminal to the catalytic tyr kinase domain. They negatively regulate the activity of Src kinases that are anchored to the plasma membrane. To inhibit Src kinases, CSK is translocated to the membrane via binding to specific transmembrane proteins, G-proteins, or adaptor proteins near the membrane. CSK catalyzes the tyr phosphorylation of the regulatory C-terminal tail of Src kinases, resulting in their inactivation. It is expressed in a wide variety of tissues and plays a role, as a regulator of Src, in cell proliferation, survival, and differentiation, and consequently, in cancer development and progression. In addition, CSK also shows Src-independent functions. It is a critical component in G-protein signaling, and plays a role in cytoskeletal reorganization and cell migration. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212703 [Multi-domain] Cd Length: 57 Bit Score: 50.38 E-value: 7.72e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMN-KDDPDWWQGET-NGLTGLFPSNYVK 1170
Cdd:cd11769     3 ECIAKYNFNGASEEDLPFKKGDILTIVAvTKDPNWYKAKNkDGREGMIPANYVQ 56

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 50.31 E-value: 7.95e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11928     4 KALYSYEGKEPGDLKFNKGDIIILRRKvDENWYHGELNGCHGFLPASYIQC 54

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 50.20 E-value: 8.44e-08

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGE-VHGGRGWFPKSYV 932
Cdd:cd11812     4 ALYDYTANRSDELTIHRGDIIRVLYKdNDNWWFGSlVNGQQGYFPANYV 52

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 50.38 E-value: 8.49e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYVK 1170
Cdd:cd11917     9 ALYNYMPRNEDELELREGDVIDVMEKCDDGWFVGTSrrTKFFGTFPGNYVK 59

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 50.19 E-value: 8.82e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSI--GERTGIFPSNYV 1022
Cdd:cd11889     4 AVYSWAGETEGDLGFLEGDLIEVLSiGDGSWWSGKLrrNGAEGIFPSNFV 53

C2 domain present in Smad ubiquitination-related factor (Smurf)-like proteins; A single C2 domain is found in Smurf proteins, C2-WW-HECT-domain E3s, which play an important role in the downregulation of the TGF-beta signaling pathway. Smurf proteins also regulate cell shape, motility, and polarity by degrading small guanosine triphosphatases (GTPases). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have type-II topology.

Pssm-ID: 176028 [Multi-domain] Cd Length: 123 Bit Score: 52.31 E-value: 9.31e-08

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1580 PYCEVSM-GSQSYTTRTLQDTLNPKWNFNCQFFIKDlyQDVLCLTMFDRDQFSPDD--FLGRTEVPVAKIrteQESKGPT 1656
Cdd:cd08382    23 PFAVITVdGGQTHSTDVAKKTLDPKWNEHFDLTVGP--SSIITIQVFDQKKFKKKDqgFLGCVRIRANAV---LPLKDTG 97


                  ....*..
gi 312176401 1657 TRRLLLH 1663
Cdd:cd08382    98 YQRLDLR 104

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 49.79 E-value: 9.48e-08

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNY 800
Cdd:cd11818     3 RALYDFTGENEDELSFKAGDIIteleSIDEE------WMSGELRGKSGIFPKNF 50

C2 domain second repeat present in Rabphilin and Double C2 domain; Rabphilin is found neurons and in neuroendrocrine cells, while Doc2 is found not only in the brain but in tissues, including mast cells, chromaffin cells, and osteoblasts. Rabphilin and Doc2s share highly homologous tandem C2 domains, although their N-terminal structures are completely different: rabphilin contains an N-terminal Rab-binding domain (RBD),7 whereas Doc2 contains an N-terminal Munc13-1-interacting domain (MID). C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176030 [Multi-domain] Cd Length: 133 Bit Score: 52.74 E-value: 9.49e-08

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVS----MGSQS-YTTRTLQDTLNPKWNFNCQFFIK--DLYQDVLCLTMFDRDQ 1629
Cdd:cd08384    13 RGLIVGIIRCVNLAAMDANGYSDPFVKLYlkpdAGKKSkHKTQVKKKTLNPEFNEEFFYDIKhsDLAKKTLEITVWDKDI 92


                  ....*...
gi 312176401 1630 FSPDDFLG 1637
Cdd:cd08384    93 GKSNDYIG 100

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 49.95 E-value: 1.01e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILV-TQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11927     5 ALYNYEGKEPGDLKFSKGDIIILrRQVDENWYHGEVNGIHGFFPTNFVQ 53

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 50.01 E-value: 1.05e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWW-TGSIGERTGIFPSNYVR 1023
Cdd:cd11849     2 YRALYDFKSAEPNTLSFSEGETFLLLERsNAHWWlVTNHSGETGYVPANYVK 53

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 49.78 E-value: 1.10e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYV 1169
Cdd:cd11784     3 VALHSYSAHRPEELELQKGEGVRVLGKFQEGWLRGLSlvTGRVGIFPSNYV 53

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 49.69 E-value: 1.12e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11828     3 EALWDHVTMDPEELGFKAGDVIEVLDmSDKDWWWGSIRDEEGWFPASFVR 52

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 49.54 E-value: 1.12e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 312176401   976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYVR 1023
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDgWWEGINTGRTGLVPANYVE 49

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 49.70 E-value: 1.13e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHV 1100
Cdd:cd11806     8 FVATDDSQLSFESGDKLLVLRKPSVDWWWAEHNG-----CCGYIPASHL 51

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 49.71 E-value: 1.19e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKtVGEPgWLYGSFQGKFGWFPCNYV 801
Cdd:cd11816     3 VARFDFEGEQEDELSFSEGDVITLKEY-VGEE-WAKGELNGKIGIFPLNFV 51

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 49.64 E-value: 1.19e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11874     3 KVLFSYTPQNEDELELKVGDTIEVLGEV--EEGWWEGKLNGKVGVFPSNFVK 52

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 57.07 E-value: 1.20e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  349 QKTQEEEPQKKLpvtfEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLE 428
Cdd:PTZ00121 1468 EAKKADEAKKKA----EEAKKADEAKKKAEEAKKKADEAKKAAEAKKKADEAKKAEEAKKADEAKKAEEAKKADEAKKAE 1543

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  429 KQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLElEAVNGKHQQISG 508
Cdd:PTZ00121 1544 EKKKADELKKAEELKKAEEKKKAEEAKKAEEDKNMALRKAEEAKKAEEARIEEVMKLYEEEKKMKAE-EAKKAEEAKIKA 1622

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  509 RlqdvQIRKQTQ-KTELEVLDKQCDLEIMEIKQLQQELKEyqnkliylvpekqllnERIKNMQLSNTPDSgisllHKKSS 587
Cdd:PTZ00121 1623 E----ELKKAEEeKKKVEQLKKKEAEEKKKAEELKKAEEE----------------NKIKAAEEAKKAEE-----DKKKA 1677

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  588 E---KEELCQRLKEQLDALEKETASKlsemdsfnnqlkcgsmddcvlqcllsllsclnnlfllLKELRESYNTQQLALEQ 664
Cdd:PTZ00121 1678 EeakKAEEDEKKAAEALKKEAEEAKK-------------------------------------AEELKKKEAEEKKKAEE 1720

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|.
gi 312176401  665 LHkikrdKLKEIERKRLEQIQKKklEDEAARKAkqgkenlwrESIRKEEEEKQKRLQEEKSQDKTQEEERK 735
Cdd:PTZ00121 1721 LK-----KAEEENKIKAEEAKKE--AEEDKKKA---------EEAKKDEEEKKKIAHLKKEEEKKAEEIRK 1775

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 49.56 E-value: 1.21e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11856     2 YVAIADYEAQGDDEISLQEGEVVEVLEKnDSGWWYVRKGDKEGWVPASYLEP 53

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 49.70 E-value: 1.23e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE-----WWTGSIGERTGIFPS 1019
Cdd:cd11762     4 ALYDYEAQSDEELSFPEGAIIRILRKDDNgvddgWWEGEFNGRVGVFPS 52

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 49.64 E-value: 1.32e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11978     5 ARYDFCARDMRELSLLKGDVVKIYTKM-STNGWWRGEVNGRVGWFPSTYVEE 55

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 49.63 E-value: 1.35e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTG--SIGERtGIFPSNYVRP 1024
Cdd:cd11763     4 ALYDFDSQPSGELSLRAGEVLTITRQDVGdgWLEGrnSRGEV-GLFPSSYVEI 55

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 49.62 E-value: 1.37e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPSNYVKM 1171
Cdd:cd11935     5 AMYDYSAQDEDEVSFRDGDYIVNVQPIDEGWMYGtvQRTGRTGMLPANYIEF 56

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 56.61 E-value: 1.42e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  336 KQVDSVNGTLPSYQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQ----QQREAERKAQKEKEEWERKQRE 411
Cdd:PRK03918  221 EELEKLEKEVKELEELKEEIEELEKELESLEGSKRKLEEKIRELEERIEELKKEieelEEKVKELKELKEKAEEYIKLSE 300

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  412 LQEQEWKKQLELEKRL----------EKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTR---- 477
Cdd:PRK03918  301 FYEEYLDELREIEKRLsrleeeingiEERIKELEEKEERLEELKKKLKELEKRLEELEERHELYEEAKAKKEELERlkkr 380

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  478 ----EQEDIVR----LSSRKKSLHLELEAVNGKH---QQISGRLQDVQIRKQTQKTELEV----LDKQCDLEIM-----E 537
Cdd:PRK03918  381 ltglTPEKLEKeleeLEKAKEEIEEEISKITARIgelKKEIKELKKAIEELKKAKGKCPVcgreLTEEHRKELLeeytaE 460

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  538 IKQLQQELKEYQNKL-----------IYLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKE 606
Cdd:PRK03918  461 LKRIEKELKEIEEKErklrkelreleKVLKKESELIKLKELAEQLKELEEKLKKYNLEELEKKAEEYEKLKEKLIKLKGE 540

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  607 T---ASKLSEMDSFNNQLKcgsmddcVLQCLLSLLSCLNNLflLLKELRE----SYNTQQLALEQLHKIKRDKL------ 673
Cdd:PRK03918  541 IkslKKELEKLEELKKKLA-------ELEKKLDELEEELAE--LLKELEElgfeSVEELEERLKELEPFYNEYLelkdae 611

                         410       420       430       440       450       460
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  674 KEIERKrLEQIQKKKLEDEAARKAKQGKENLWrESIRKEEEEKQKRLQEEKSQDKTQEEERKAEA 738
Cdd:PRK03918  612 KELERE-EKELKKLEEELDKAFEELAETEKRL-EELRKELEELEKKYSEEEYEELREEYLELSRE 674

First Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the first SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212720 [Multi-domain] Cd Length: 53 Bit Score: 49.67 E-value: 1.44e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11786     3 KALYNYEGKEPGDLSFKKGDIIllrkRIDEN------WYHGECNGKQGFFPASYVQ 52

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 49.70 E-value: 1.44e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVG--EPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11762     3 RALYDYEAQSDEELSFPEGAIIRILRKDDNgvDDGWWEGEFNGRVGVFPSLVVE 56

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 49.66 E-value: 1.46e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE---WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11875     4 VLFDYEAENEDELTLREGDIVTILSKDCEdkgWWKGELNGKRGVFPDNFVEP 55

C2 domain found in fungal Ingression 1 (Inn1) proteins; Saccharomyces cerevisiae Inn1 associates with the contractile actomyosin ring at the end of mitosis and is needed for cytokinesis. The C2 domain of Inn1, located at the N-terminus, is required for ingression of the plasma membrane. The C-terminus is relatively unstructured and contains eight PXXP motifs that are thought to mediate interaction of Inn1 with other proteins with SH3 domains in the cytokinesis proteins Hof1 (an F-BAR protein) and Cyk3 (whose overexpression can restore primary septum formation in Inn1Delta cells) as well as recruiting Inn1 to the bud-neck by binding to Cyk3. Inn1 and Cyk3 appear to cooperate in activating chitin synthase Chs2 for primary septum formation, which allows coordination of actomyosin ring contraction with ingression of the cleavage furrow. It is thought that the C2 domain of Inn1 helps to preserve the link between the actomyosin ring and the plasma membrane, contributing both to membrane ingression, as well as to stability of the contracting ring. Additionally, Inn1 might induce curvature of the plasma membrane adjacent to the contracting ring, thereby promoting ingression of the membrane. It has been shown that the C2 domain of human synaptotagmin induces curvature in target membranes and thereby contributes to fusion of these membranes with synaptic vesicles. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176063 [Multi-domain] Cd Length: 118 Bit Score: 51.48 E-value: 1.47e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELkackPN----GKSNPYCEVSMGSQSYTTRTL----QdtlNPKWNFNCQFFIKDLYQDVLCLTMFDrD 1628
Cdd:cd08681     1 GTLVVVVLKARNL----PNkrklDKQDPYCVLRIGGVTKKTKTDfrggQ---HPEWDEELRFEITEDKKPILKVAVFD-D 72

                          90       100
                  ....*....|....*....|...
gi 312176401 1629 QFSPDDFLGRTEVPVAKIRTEQE 1651
Cdd:cd08681    73 DKRKPDLIGDTEVDLSPALKEGE 95

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 49.56 E-value: 1.53e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11964     5 AIYDFEAAEDNELTFKAGDIItILDDSDPNWWKGETPQGTGLFPSNFV 52

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 49.54 E-value: 1.53e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11928     5 ALYSYEGKEPGDLKFNKGDIIILRRKvDENWYHGELNGCHGFLPASYIQ 53

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 49.45 E-value: 1.56e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILV-TQKDGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11870     3 VALHRYEAQGPEDLGFREGDTIDVlSEVNEAWLEGHSDGRVGIFPKCFVVP 53

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 49.44 E-value: 1.58e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11961     2 AKALYDYDAAEDNELSFFENDKIINIEfVDDDWWLGECHGSRGLFPSNYVEL 53

Src Homology 3 domain of Bruton's tyrosine kinase; BTK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain with proline-rich and zinc-binding regions. Btk is expressed in B-cells, and a variety of myeloid cells including mast cells, platelets, neutrophils, and dendrictic cells. It interacts with a variety of partners, from cytosolic proteins to nuclear transcription factors, suggesting a diversity of functions. Stimulation of a diverse array of cell surface receptors, including antigen engagement of the B-cell receptor (BCR), leads to PH-mediated membrane translocation of Btk and subsequent phosphorylation by Src kinase and activation. Btk plays an important role in the life cycle of B-cells including their development, differentiation, proliferation, survival, and apoptosis. Mutations in Btk cause the primary immunodeficiency disease, X-linked agammaglobulinaemia (XLA) in humans. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212839 [Multi-domain] Cd Length: 55 Bit Score: 49.44 E-value: 1.60e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG-ETNGLTGLFPSNYV 1169
Cdd:cd11906     3 VVALYDYTPMNAQDLQLRKGEEYVILEESNLPWWRArDKNGREGYIPSNYV 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 49.62 E-value: 1.81e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGL---TGLFPSNYVKM 1171
Cdd:cd11965     1 RVKTIYDCQADNDDELTFVEGEVIIVTGEEDQEWWIGHIEGQperKGVFPVSFVHI 56

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 49.19 E-value: 1.83e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 932
Cdd:cd11766     1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDgWWRGECNGQVGWFPSNYV 51

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 49.56 E-value: 1.83e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  748 VNYRALYPFEARNHDEMSFSSGD-IIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNYVE 802
Cdd:cd11998     1 VRVRALYDYDGQEQDELSFKAGDeLTKLEDED--EQGWCKGRLDsGQVGLYPANYVE 55

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 49.12 E-value: 1.89e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*..
gi 312176401  1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQGELqargKKRQKGWFPA 1097
Cdd:pfam00018    5 DYTAQEPDELSFKKGDIIIVLEKSEDGWWKGRN----KGGKEGLIPS 47

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing proteins, also called TULA (T cell Ubiquitin LigAnd) family of proteins; UBASH3 or TULA proteins are also referred to as Suppressor of T cell receptor Signaling (STS) proteins. They contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. In some vertebrates, there are two TULA family proteins, called UBASH3A (also called TULA or STS-2) and UBASH3B (also called TULA-2 or STS-1), which show partly overlapping as well as distinct functions. UBASH3B is widely expressed while UBASH3A is only found in lymphoid cells. UBASH3A facilitates apoptosis induced in T cells through its interaction with the apoptosis-inducing factor AIF. UBASH3B is an active phosphatase while UBASH3A is not. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212725 [Multi-domain] Cd Length: 59 Bit Score: 49.22 E-value: 1.93e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEP--GWLYGSFQ--GKFGWFPCNYVEK 803
Cdd:cd11791     2 LRVLYPYTPQEEDELELVPGDYIYVSPEELDSSsdGWVEGTSWltGCSGLLPENYTEK 59

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 49.05 E-value: 1.95e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd12047     3 VAQHDYSAQGPEDLEFSQGDTIdILSEVNQEWLEGHCDGRIGIFPKCFAVR 53

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 49.26 E-value: 1.99e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE--TNGLTGLFPSNYV 1169
Cdd:cd11793     1 QVQCVHAYTAQQPDELTLEEGDVVNVLRKMPDGWYEGErlRDGERGWFPSSYT 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 49.18 E-value: 2.03e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNG---LTGLFPSNYV 1169
Cdd:cd11966     1 RVKALYNCVADNPDELTFSEGEIIIVDGEEDKEWWIGHIDGeptRRGAFPVSFV 54

C2 domain fifth repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the fifth C2 repeat, C2E, and has a type-II topology.

Pssm-ID: 176002 [Multi-domain] Cd Length: 124 Bit Score: 51.40 E-value: 2.05e-07

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1561 VHVIEATELKACKPNGKSNPYCEVSMGSQSYTTR--TLQDTLNPKwnFNCQFFIK-DLYQD-VLCLTMFDRDQFSPDDFL 1636
Cdd:cd04037     4 VYVVRARNLQPKDPNGKSDPYLKIKLGKKKINDRdnYIPNTLNPV--FGKMFELEaTLPGNsILKISVMDYDLLGSDDLI 81


                  ....*
gi 312176401 1637 GRTEV 1641
Cdd:cd04037    82 GETVI 86

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 49.15 E-value: 2.10e-07

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                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11928     5 ALYSYEGKEPGDLKFNKGDIIILRRKVDENWYHGELNGCHGFLPASYIQC 54

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 49.19 E-value: 2.11e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKG-QLINVMNKDDPDWWQGE-TNGLTGLFPSNYVK 1170
Cdd:cd11997     3 RVRALYDYTGQEADELSFKAGeELLKIGEEDEQGWCKGRlLSGRIGLYPANYVE 56

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 49.23 E-value: 2.17e-07

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                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSI-GERTGIFPSNYV 1022
Cdd:cd11819     3 KALYDYQAAEDNEISFVEGDIITqIEQIDEGWWLGVNaKGQKGLFPANYV 52

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 49.17 E-value: 2.18e-07

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11929     2 RAKALCNYRGHNPGDLKFNKGDVILLRRQlDENWYLGEINGVSGIFPASSVEV 54

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 49.30 E-value: 2.22e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDG----EWWTGSIGERTGIFPSNY 1021
Cdd:cd11807     5 ALFDYEAENGDELSFREGDELTVLRKGDddetEWWWARLNDKEGYVPRNL 54

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 49.18 E-value: 2.26e-07

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                  ....*....|....*....|....*....|....*....|....*.
gi 312176401  890 WTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11995     9 YTAQNDDELAFSKGQIINVLNKEDpDWWKGELNGQVGLFPSNYVKL 54

Src homology 3 domain of Endophilin-A; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain three endophilin-A isoforms (A1, A2, and A3). Endophilin-A proteins are enriched in the brain and play multiple roles in receptor-mediated endocytosis. They tubulate membranes and regulate calcium influx into neurons to trigger the activation of the endocytic machinery. They are also involved in the sorting of plasma membrane proteins, actin filament assembly, and the uncoating of clathrin-coated vesicles for fusion with endosomes. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212737 [Multi-domain] Cd Length: 55 Bit Score: 49.18 E-value: 2.31e-07

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:cd11803     3 CRALYDFEPENEGELGFKEGDIITLTNQiDENWYEGMVNGQSGFFPVNYVEVL 55

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 48.80 E-value: 2.31e-07

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                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11873     2 VIVEFDYDAEEPDELTLKVGDIITNVKKM--EEGWWEGTLNGKRGMFPDNFVKV 53

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 48.82 E-value: 2.36e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11996     5 AMYDYTANNEDELSFSKGQLINVLNKD--DPDWWQGEINGVTGLFPSNYVK 53

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 48.87 E-value: 2.42e-07

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYVE 802
Cdd:cd11793     4 CVHAYTAQQPDELTLEEGDVVNVLRKM--PDGWYEGErlRDGERGWFPSSYTE 54

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 48.81 E-value: 2.47e-07

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                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:cd12054     4 KVLFEYVPQNEDELELKVGDIIDINEEV--EEGWWSGTLNGKSGLFPSNFVKEL 55

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 49.16 E-value: 2.47e-07

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                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE---WWTGSIGERTGIFPSNY 1021
Cdd:cd11952     5 ALWDYSAEFPDELSFKEGDMVTVLRKDGEgtdWWWASLCGREGYVPRNY 53

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 48.66 E-value: 2.53e-07

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                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1050 SAYAASGT---EQLSLAPGQLILILKKNTSGWWQGElqargKKRQKGWFPASHV 1100
Cdd:cd11829     4 TLYAFTGEqhqQGLSFEAGELIRVLQAPDGGWWEGE-----KDGLRGWFPASYV 52

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 48.86 E-value: 2.58e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 932
Cdd:cd11963     3 KVRALYDFEAVEDNELTFKHGEIIIVLDDSDaNWWKGENHRGVGLFPSNFV 53

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 49.17 E-value: 2.59e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGE------WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd12058     2 WTALYDYEASGEDELSLRRGDVVEVLSQDAAvsgddgWWAGKIRHRLGIFPANYVTR 58

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 48.64 E-value: 2.70e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11869     4 ALFDFTGNSKLELNFKAGDVIFLLSRVNKDWLEGTVRGATGIFPLSFVKI 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 48.89 E-value: 2.76e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11782     1 EARAKYNFNADTGVELSFRKGDVITLTRRVDENWYEGRIGGRQGIFPVSYVQ 52

C2 domain second repeat present in Tricalbin-like proteins; 5 to 6 copies of the C2 domain are present in Tricalbin, a yeast homolog of Synaptotagmin, which is involved in membrane trafficking and sorting. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176017 [Multi-domain] Cd Length: 111 Bit Score: 50.68 E-value: 2.85e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1576 GKSNPYCEVSMGSQS-YTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDrDQFSPDDFLGRTEVPVAKI--RTEQEs 1652
Cdd:cd04052    11 GLLSPYAELYLNGKLvYTTRVKKKTNNPSWNASTEFLVTDRRKSRVTVVVKD-DRDRHDPVLGSVSISLNDLidATSVG- 88

                          90
                  ....*....|....*...
gi 312176401 1653 kgptTRRLLLHEVPTGEV 1670
Cdd:cd04052    89 ----QQWFPLSGNGQGRI 102

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 48.65 E-value: 2.88e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGWLYGSFQGKFGWFPCNY 800
Cdd:cd11778     4 ALYDYEAQGDDEISIRVGDRIAVIRGDDGS-GWTYGEINGVKGLFPTSY 51

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 48.52 E-value: 2.89e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11824     2 YSVLYDYTAQEDDELSISKGDVVAVIEK--GEDGWWTVERNGQKGLVPGTYLEK 53

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 48.85 E-value: 2.95e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd12060     6 ARFNFKQTNEDELSVCKGDIIYVTRvEEGGWWEGTLNGKTGWFPSNYVR 54

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 48.84 E-value: 3.14e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPSNYVK 1170
Cdd:cd11934     7 AVYDYNAADEDEVSFQDGDTIVNVQQIDDGWMYGtvERTGDTGMLPANYVE 57

Src homology 3 domain of Ysc84p and similar fungal proteins; This family is composed of the Saccharomyces cerevisiae proteins, Ysc84p (also called LAS17-binding protein 4, Lsb4p) and Lsb3p, and similar fungal proteins. They contain an N-terminal SYLF domain (also called DUF500) and a C-terminal SH3 domain. Ysc84p localizes to actin patches and plays an important in actin polymerization during endocytosis. The N-terminal domain of both Ysc84p and Lsb3p can bind and bundle actin filaments. A study of the yeast SH3 domain interactome predicts that the SH3 domains of Lsb3p and Lsb4p may function as molecular hubs for the assembly of endocytic complexes. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212776 [Multi-domain] Cd Length: 55 Bit Score: 48.57 E-value: 3.17e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ---QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11842     1 KAVALYDFAGEQPGDLAFQKGDIITILKKsdsQNDWWTGRIGGREGIFPANYVEL 55

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 48.85 E-value: 3.21e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:cd11920     4 RAVYDFKAQTSKELSFKKGDTVYILRKI--DQNWYEGEHHGRVGIFPISYVEKL 55

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 48.49 E-value: 3.52e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTG-SIGE-RTGIFPSNYVRPKD 1026
Cdd:cd12007     3 FVALYDYEARTTEDLSFKKGERFqIINNTEGDWWEArSIATgKNGYIPSNYVAPAD 58

SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 394975 [Multi-domain] Cd Length: 47 Bit Score: 48.35 E-value: 3.53e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*.
gi 312176401   885 QALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGR-GWFP 928
Cdd:pfam00018    1 VALYDYTAQEPDELSFKKGDIIIVLEKSEdGWWKGRNKGGKeGLIP 46

C2 domain second repeat present in Synaptotagmin-like proteins; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176015 [Multi-domain] Cd Length: 105 Bit Score: 50.26 E-value: 3.55e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPddfLGR 1638
Cdd:cd04050     2 LFVYLDSAKNLPLAKSTKEPSPYVELTVGKTTQKSKVKERTNNPVWEEGFTFLVRNPENQELEIEVKDDKTGKS---LGS 78

                          90
                  ....*....|...
gi 312176401 1639 TEVPVAKIRTEQE 1651
Cdd:cd04050    79 LTLPLSELLKEPD 91

C2 domain present in Calpain proteins; A single C2 domain is found in calpains (EC 3.4.22.52, EC 3.4.22.53), calcium-dependent, non-lysosomal cysteine proteases. Caplains are classified as belonging to Clan CA by MEROPS and include six families: C1, C2, C10, C12, C28, and C47. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176011 [Multi-domain] Cd Length: 126 Bit Score: 50.74 E-value: 3.65e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1561 VHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLcLTMFDRDQFSpDDFLGRTE 1640
Cdd:cd04046     7 VHVHSAEGLSKQDSGGGADPYVIIKCEGESVRSPVQKDTLSPEFDTQAIFYRKKPRSPIK-IQVWNSNLLC-DEFLGQAT 84


                  ....
gi 312176401 1641 VPVA 1644
Cdd:cd04046    85 LSAD 88

Ca2+-dependent lipid-binding protein, contains C2 domain [General function prediction only];

Pssm-ID: 227371 [Multi-domain] Cd Length: 1227 Bit Score: 55.15 E-value: 3.84e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMGSQS-YTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDF 1635
Cdd:COG5038  1040 GYLTIMLRSGENLPSSDENGYSDPFVKLFLNEKSvYKTKVVKKTLNPVWNEEFTIEVLNRVKDVLTINVNDWDSGEKNDL 1119

                          90
                  ....*....|....*..
gi 312176401 1636 LGRTEVPVAKIRTEQES 1652
Cdd:COG5038  1120 LGTAEIDLSKLEPGGTT 1136

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 48.18 E-value: 3.89e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  749 NYRALYPFEARNHDEMSFSSGDIIQVDEKTvGEpgWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11838     1 EYIALYPYESNEPGDLTFNAGDVILVTKKD-GE--WWTGTIGDRTGIFPSNYVRP 52

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 48.40 E-value: 4.09e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1048 VTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGElqargKKRQKGWFPASHVK 1101
Cdd:cd11856     4 AIADYEAQGDDEISLQEGEVVEVLEKNDSGWWYVR-----KGDKEGWVPASYLE 52

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 48.45 E-value: 4.10e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFG-WFPCNYVEKVL 805
Cdd:cd11970     7 KALFDYKAQREDELTFTKNAIIQNVEKQEG--GWWRGDYGGKKQlWFPSNYVEEIS 60

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 48.00 E-value: 4.26e-07

                           10        20        30        40
                   ....*....|....*....|....*....|....*....|....*....
gi 312176401   886 ALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 933
Cdd:pfam14604    1 ALYPYEPKDDDELSLQRGDVITVIEESEDgWWEGINTGRTGLVPANYVE 49

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 48.18 E-value: 4.58e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQGELqaRGKkrqKGWFPASHV 1100
Cdd:cd11827     7 AYDAQDTDELSFNEGDIIEILKEDPSGWWTGRL--RGK---EGLFPGNYV 51

C2A domain first repeat present in Synaptotagmin 8; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176033 [Multi-domain] Cd Length: 124 Bit Score: 50.48 E-value: 4.62e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM---GSQSYTTRTLQDTLNPKW--NFNCQFFIKDLYQDVLCLTMFDRDQFS 1631
Cdd:cd08387    16 GILNVKLIQARNLQPRDFSGTADPYCKVRLlpdRSNTKQSKIHKKTLNPEFdeSFVFEVPPQELPKRTLEVLLYDFDQFS 95

                          90
                  ....*....|....*
gi 312176401 1632 PDDFLGRTEVPVAKI 1646
Cdd:cd08387    96 RDECIGVVELPLAEV 110

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 48.47 E-value: 4.62e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPSNYVK 1170
Cdd:cd11933     6 AMYDYRAADDDEVSFKDGDTIVNVQTIDEGWMYGtvQRTGKTGMLPANYVE 56

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 47.86 E-value: 4.73e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSY 931
Cdd:cd11818     1 KARALYDFTGENEDELSFKAGDIITELESiDEEWMSGELRGKSGIFPKNF 50

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 48.08 E-value: 5.03e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNK--DDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11977     4 VARYNFAARDMRELSLREGDVVRIYSRigGDQGWWKGETNGRIGWFPSTYVE 55

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 48.03 E-value: 5.18e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGSIGERTGIFPSNYV 1022
Cdd:cd11766     2 AVVKFNYEAQREDELSLRKGDRVLVLEKssDG-WWRGECNGQVGWFPSNYV 51

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 54.68 E-value: 5.21e-07

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   378 ELEKRRQVLMEQQQ--REAERKAQKEKEEWERKQRELQEQewkkQLELEKRLEKqrelerqrEEERRKEIER--REAAKQ 453
Cdd:TIGR02168  695 ELEKALAELRKELEelEEELEQLRKELEELSRQISALRKD----LARLEAEVEQ--------LEERIAQLSKelTELEAE 762

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   454 ELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRkqtqkteLEVLDKQCDL 533
Cdd:TIGR02168  763 IEELEERLEEAEEELAEAEAEIEELEAQIEQLKEELKALREALDELRAELTLLNEEAANLRER-------LESLERRIAA 835

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   534 EIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQlsntpdSGISLLHKKSSEKEELCQRLKEQLDALEKETASKLSE 613
Cdd:TIGR02168  836 TERRLEDLEEQIEELSEDIESLAAEIEELEELIEELE------SELEALLNERASLEEALALLRSELEELSEELRELESK 909

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   614 MDSFNNQLKC--GSMDDCVLQCLLSLLSCLNnlflLLKELRESYNTQQLALEQLHKIKRDKLKEIERkRLEQIQKKK--- 688
Cdd:TIGR02168  910 RSELRRELEElrEKLAQLELRLEGLEVRIDN----LQERLSEEYSLTLEEAEALENKIEDDEEEARR-RLKRLENKIkel 984

                          330       340       350       360       370
                   ....*....|....*....|....*....|....*....|....*....|...
gi 312176401   689 ----------LEDEAARK---------AKQGKENLwRESIRKEEEEKQKRLQE 722
Cdd:TIGR02168  985 gpvnlaaieeYEELKERYdfltaqkedLTEAKETL-EEAIEEIDREARERFKD 1036

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRB2 binds to Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, as well as to the proline-rich C-terminus of FGRF2. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212882 [Multi-domain] Cd Length: 53 Bit Score: 47.91 E-value: 5.29e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11949     3 QALFDFDPQEDGELGFRRGDFIEVMDNS--DPNWWKGACHGQTGMFPRNYVT 52

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 47.90 E-value: 5.49e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  752 ALYPFEARNHDEMSFSSGDII----QVDEktvgepGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12073     5 ALYDYQGEGDDEISFDPQETItdieMVDE------GWWKGTCHGHRGLFPANYVE 53

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 47.76 E-value: 5.90e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|
gi 312176401  895 ENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 933
Cdd:cd12061    13 EDELSFSKGDVIHVTRVEEGgWWEGTHNGRTGWFPSNYVR 52

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 47.96 E-value: 5.98e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEV---HGGRGWFPKSYVKL 934
Cdd:cd11872     4 AIYNFQGDGEHQLSLQVGDTVQILEECEGWYRGFSlrnKSLKGIFPKSYVHI 55

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 48.03 E-value: 5.98e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVT-QKDGEWWTGSI-GE--RTGIFPSNYV 1022
Cdd:cd11966     4 ALYNCVADNPDELTFSEGEIIIVDgEEDKEWWIGHIdGEptRRGAFPVSFV 54

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 47.75 E-value: 6.17e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGSI-GERTGIFPSNYVRP 1024
Cdd:cd11837     2 ATALYPWRAKKENHLSFAKGDIITVLEQQEMWWFGELeGGEEGWFPKSYVKE 53

Src homology 3 domains of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212785 Cd Length: 62 Bit Score: 48.08 E-value: 6.51e-07

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1120 VIAMYDY----MANNED---ELNFSKGQLINVM-NKDDPDWWQGETNGL-TGLFPSNYVK 1170
Cdd:cd11851     2 MVALYDYnpetMSPNDDpeeELSFHAGDVVRVYgPMDEDGFYYGELEGGrKGLVPSNFVQ 61

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 3; GRAF3 is also called Rho GTPase activating protein 42 (ARHGAP42) or ARHGAP10-like. Though its function has not been characterized, it may be a GAP with activity towards RhoA and Cdc42, based on its similarity to GRAF and GRAF2. It contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212999 Cd Length: 55 Bit Score: 47.75 E-value: 6.66e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12066     3 KAMYSCKAEHSHELSFPQGAIFSNVYPSV-EPGWLKATYEGKTGLVPENYVV 53

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 47.64 E-value: 6.79e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11995     5 GMYDYTAQNDDELAFSKGQIINVLNKE--DPDWWKGELNGQVGLFPSNYVK 53

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 47.76 E-value: 6.93e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11828     1 LAEALWDHVTMDPEELGFKAGDVIEVLDMSDkDWWWGSIRDEEGWFPASFVRL 53

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 47.51 E-value: 6.94e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDE-MSFSSGDIIQVDEktVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11829     3 RTLYAFTGEQHQQgLSFEAGELIRVLQ--APDGGWWEGEKDGLRGWFPASYV 52

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 47.63 E-value: 7.06e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILV-TQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11929     5 ALCNYRGHNPGDLKFNKGDVILLrRQLDENWYLGEINGVSGIFPASSVE 53

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 47.71 E-value: 7.13e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNK---DDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11884     2 VVAVRAYITRDQTLLSFHKGDVIKLLPKegpLDPGWLFGTLDGRSGAFPKEYV 54

First Src homology 3 domain (or SH3A) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212770 [Multi-domain] Cd Length: 55 Bit Score: 47.74 E-value: 7.42e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKD-GE--WWTGSIGERTGIFPSNYV 1022
Cdd:cd11836     2 YRALYAFEARNPDEISFQPGDIIQVDESQvAEpgWLAGELKGKTGWFPANYV 53

Second Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212700 [Multi-domain] Cd Length: 53 Bit Score: 47.65 E-value: 7.66e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHV 1100
Cdd:cd11766     1 PAVVKFNYEAQREDELSLRKGDRVLVLEKSSDGWWRGECNG-----QVGWFPSNYV 51

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 47.63 E-value: 7.81e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQ-LINVMNKDDPDWWQGETN-GLTGLFPSNYV 1169
Cdd:cd11999     3 RVRAVYDYTGQEPDELSFKAGEeLLKVEDEDEQGWCKGVTDgGAVGLYPANYV 55

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 47.60 E-value: 8.07e-07

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11986     3 VALYRFKALEKDDLDFHPGERITVIDDSNEEWWRGKIGEKTGYFPMNFI 51

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 47.64 E-value: 8.14e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1119 QVIAMYDYMANNEDELNFSKG-QLINVMNKDDPDWWQGE-TNGLTGLFPSNYVK 1170
Cdd:cd11998     2 RVRALYDYDGQEQDELSFKAGdELTKLEDEDEQGWCKGRlDSGQVGLYPANYVE 55

FYVE, RhoGEF and PH domain containing/faciogenital dysplasia proteins 5 and 6, N-terminal Pleckstrin Homology (PH) domain; FGD5 regulates promotes angiogenesis of vascular endothelial growth factor (VEGF) in vascular endothelial cells, including network formation, permeability, directional movement, and proliferation. The specific function of FGD6 is unknown. In general, FGDs have a RhoGEF (DH) domain, followed by a PH domain, a FYVE domain and a C-terminal PH domain. All FGDs are guanine nucleotide exchange factors that activate the Rho GTPase Cdc42, an important regulator of membrane trafficking. The RhoGEF domain is responsible for GEF catalytic activity, while the PH domain is involved in intracellular targeting of the DH domain. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275424 Cd Length: 124 Bit Score: 49.58 E-value: 8.37e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1421 RKLLHSGKLYKTkSNKEL---HAFLFNDFLLLTYLVrqfaaasgheklfnsKSSAQFRMYKTPIFLNeVLVKLPTDPS-S 1496
Cdd:cd13389    12 RKLIKEGELMKV-SRKEMqprYFFLFNDCLLYTTPV---------------QSSGMLKLNNELPLSG-MKVKLPEDEEyS 74

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*.
gi 312176401 1497 DEpvFHISHIDRVYTLRTDNINERTAWVQKIKGASEQYIdteKKKR 1542
Cdd:cd13389    75 NE--FQIISTKRSFTLIASSEEERDEWVKALSRAIEEHT---KKQR 115

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 47.43 E-value: 8.64e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNK--DDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11866     4 GLWDCSGNEPDELSFKRGDLIYIISKeyDSFGWWVGELNGKVGLVPKDYL 53

Pleckstrin homology domain-containing family G member 7 pleckstrin homology (PH) domain; PLEKHG7 has a RhoGEF DH/double-homology domain in tandem with a PH domain which is involved in phospholipid binding. PLEKHG7 is proposed to functions as a guanine nucleotide exchange factor (GEF) and is involved in the regulation of Rho protein signal transduction. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270065 Cd Length: 128 Bit Score: 49.58 E-value: 9.40e-07

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1422 KLLHSGKLYKTKSNK--ELHAFLFNDFLLLTYLVRQ---------FAAASGHEKLFNSKSSAQFRMYKTPIFLNEVLVK- 1489
Cdd:cd13245     1 QLLHEGPLTLIESGKtlDVYLFLFDDMLLITKMKKNlkkkkssdsENSMPSLELTPLIKEGGSYTVYKQPIPLDRLCLHd 80

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401 1490 -LPTDPSSD--EPVFHISHIDR------VYTLRTDNINERTAWVQKIK 1528
Cdd:cd13245    81 vDPNEATANglKHAFVLVHLNRyqqvigVYTLQASSENTKQTWMSKLR 128

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 47.20 E-value: 9.53e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd12052     1 EAIVEFDYKAQHEDELTITVGDIITkIKKDDGGWWEGEIKGRRGLFPDNFVR 52

Second C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212894 [Multi-domain] Cd Length: 53 Bit Score: 47.13 E-value: 9.67e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGD-IIQVDektVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11961     3 KALYDYDAAEDNELSFFENDkIINIE---FVDDDWWLGECHGSRGLFPSNYVE 52

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 47.26 E-value: 9.95e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11995     4 IGMYDYTAQNDDELAFSKGQIInVLNKEDPDWWKGELNGQVGLFPSNYVK 53

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 47.39 E-value: 9.95e-07

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVL---EQQENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11841     2 VTALYSFEGQQPCDLSFQAGDRITVLtrtDSQFDWWEGRLRGRVGIFPANYVS 54

C2 domain present in the putative elicitor-responsive gene; In plants elicitor-responsive proteins are triggered in response to specific elicitor molecules such as glycolproteins, peptides, carbohydrates and lipids. A host of defensive responses are also triggered resulting in localized cell death. Antimicrobial secondary metabolites, such as phytoalexins, or defense-related proteins, including pathogenesis-related (PR) proteins are also produced. There is a single C2 domain present here. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members have a type-II topology.

Pssm-ID: 176014 [Multi-domain] Cd Length: 124 Bit Score: 49.25 E-value: 1.00e-06

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                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDT-LNPKWNFNCQFFIKDLYQDV---LCLTMFDRDQFSP 1632
Cdd:cd04049     1 GTLEVLLISAKGLQDTDFLGKIDPYVIIQCRTQERKSKVAKGDgRNPEWNEKFKFTVEYPGWGGdtkLILRIMDKDNFSD 80

                          90       100       110
                  ....*....|....*....|....*....|....*..
gi 312176401 1633 DDFLGRTEVPVAKIRTEQESKGpttrrlLLHEVPTGE 1669
Cdd:cd04049    81 DDFIGEATIHLKGLFEEGVEPG------TAELVPAKY 111

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 47.12 E-value: 1.01e-06

                          10        20        30
                  ....*....|....*....|....*....|....*.
gi 312176401  898 LNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 932
Cdd:cd11829    17 LSFEAGELIRVLQAPDGgWWEGEKDGLRGWFPASYV 52

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 47.33 E-value: 1.04e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVIT-VLEQQENWWFGEVHGGR-GWFPKSYVK 933
Cdd:cd11825     2 VKALYDYRAQRPDELSFCKHAIITnVEKEDGGWWRGDYGGKKqKWFPANYVE 53

Src homology 3 domain of Signal Transducing Adaptor Molecule 1; STAM1 is part of the endosomal sorting complex required for transport (ESCRT-0) and is involved in sorting ubiquitinated cargo proteins from the endosome. It may also be involved in the regulation of IL2 and GM-CSF mediated signaling, and has been implicated in neural cell survival. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212897 [Multi-domain] Cd Length: 55 Bit Score: 47.25 E-value: 1.09e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11964     4 RAIYDFEAAEDNELTFKAGDIITILDDS--DPNWWKGETPQGTGLFPSNFV 52

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 47.07 E-value: 1.20e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQ---ENWWFGEVHGGRGWFPKSYV 932
Cdd:cd12142     1 YCRVLFDYNPVAPDELALKKGDVIEVISKEtedEGWWEGELNGRRGFFPDNFV 53

Src Homology 3 domain of SH3 domain-containing protein 21 (SH3D21) and similar proteins; N-terminal SH3 domain of the uncharacterized protein SH3 domain-containing protein 21, and similar uncharacterized domains, it belongs to the CD2AP-like_3 subfamily of proteins. The CD2AP-like_3 subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213018 [Multi-domain] Cd Length: 55 Bit Score: 47.07 E-value: 1.23e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  977 LYSYSSVEPGDLTFTEGEEILVTQKDGE---WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd12142     5 LFDYNPVAPDELALKKGDVIEVISKETEdegWWEGELNGRRGFFPDNFVMP 55

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 47.14 E-value: 1.23e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTG-IFPSNYV 1022
Cdd:cd11969     4 ALYDYRAKRSDELSFCKGALIHnVSKETGGWWKGDYGGKVQhYFPSNYV 52

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 46.95 E-value: 1.24e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVgePGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12077     3 YVTVQPYTSQGKDEIGFEKGVTVEVIQKNL--EGWWYIRYLGKEGWAPASYLKK 54

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 47.29 E-value: 1.32e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGK--FGWFPCNYVEKV 804
Cdd:cd11917     7 FQALYNYMPRNEDELELREGDVIDVMEKC--DDGWFVGTSRRTkfFGTFPGNYVKRL 61

C2 domain in Protein Kinase C (PKC) alpha and gamma; A single C2 domain is found in PKC alpha and gamma. The PKC family of serine/threonine kinases regulates apoptosis, proliferation, migration, motility, chemo-resistance, and differentiation. There are 3 groups: group 1(alpha, betaI, beta II, gamma) which require phospholipids and calcium, group 2 (delta, epsilon, theta, eta) which do not require calcium for activation, and group 3 (xi, iota/lambda) which are atypical and can be activated in the absence of diacylglycerol and calcium. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology.

Pssm-ID: 175992 [Multi-domain] Cd Length: 131 Bit Score: 49.18 E-value: 1.36e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM-----GSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDV-LCLTMFDRDQF 1630
Cdd:cd04026    13 NKLTVEVREAKNLIPMDPNGLSDPYVKLKLipdpkNETKQKTKTIKKTLNPVWNETFTFDLKPADKDRrLSIEVWDWDRT 92


                  ....*..
gi 312176401 1631 SPDDFLG 1637
Cdd:cd04026    93 TRNDFMG 99

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 46.75 E-value: 1.39e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd12073     3 AVALYDYQGEGDDEISFDPQETITDIEMvDEGWWKGTCHGHRGLFPANYVEL 54

C2 domain second repeat of Ras GTPase activating proteins (GAPs); RasGAPs suppress Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. The proteins here all contain two tandem C2 domains, a Ras-GAP domain, and a pleckstrin homology (PH)-like domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology.

Pssm-ID: 176057 [Multi-domain] Cd Length: 137 Bit Score: 49.29 E-value: 1.40e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELkACKPNGKSNPYCEVSMG----SQSYTTRTLQDTLNPKWNFNcqfFIKDLYQD---------------- 1618
Cdd:cd08675     1 LSVRVLECRDL-ALKSNGTCDPFARVTLNysskTDTKRTKVKKKTNNPRFDEA---FYFELTIGfsyekksfkveeedle 76

                          90       100       110
                  ....*....|....*....|....*....|.
gi 312176401 1619 --VLCLTMFDRDQFSPDDFLGRTEVPVAKIR 1647
Cdd:cd08675    77 ksELRVELWHASMVSGDDFLGEVRIPLQGLQ 107

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 46.74 E-value: 1.42e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGE-RTGIFPSNYV 1022
Cdd:cd11812     3 VALYDYTANRSDELTIHRGDIIRVLYKDNDnWWFGSLVNgQQGYFPANYV 52

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 46.72 E-value: 1.43e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 932
Cdd:cd11951     2 VQAQYDFSAEDPSQLSFRRGDIIEVLDCPDpNWWRGRISGRVGFFPRNYV 51

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 46.57 E-value: 1.52e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPD---WWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11844     4 ALYDNVAESPDELAFRRGDILTVLEQNTAGlegWWLCSLRGRQGIAPGNRLKL 56

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 46.63 E-value: 1.54e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPdWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11989     1 QAQALYPWRAKKDNHLNFNKNDVITVLEQQDM-WWFGEVQGQKGWFPKSYVKL 52

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 46.54 E-value: 1.60e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGG-RGWFPKSYVKL 934
Cdd:cd11819     2 AKALYDYQAAEDNEISFVEGDIITQIEQiDEGWWLGVNAKGqKGLFPANYVEL 54

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 46.87 E-value: 1.63e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPSNYV 1169
Cdd:cd11918     6 AVYQYRPQNEDELELREGDRVDVMQQCDDGWFVGvsRRTQKFGTFPGNYV 55

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 46.48 E-value: 1.64e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ--QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11976     2 AKARYDFCARDRSELSLKEGDIIKILNKkgQQGWWRGEIYGRVGWFPANYVE 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 46.57 E-value: 1.65e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11782     3 RAKYNFNADTGVELSFRKGDVITLTRRvDENWYEGRIGGRQGIFPVSYV 51

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 46.56 E-value: 1.70e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLY-GSFQGKFGWFPCNYV 801
Cdd:cd11904     4 QALYPFSSSNDEELNFEKGEVMDVIEKPENDPEWWKcRKANGQVGLVPKNYV 55

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 46.46 E-value: 1.76e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11952     3 VYALWDYSAEFPDELSFKEGDMVTVLRKDgeGTDWWWASLCGREGYVPRNY 53

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 46.60 E-value: 1.76e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11974     5 ALWDHVTMDDQELAFKAGDVIRVLEASNKDWWWGRNEDREAWFPASFVRL 54

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase; GRAF, also called Rho GTPase activating protein 26 (ARHGAP26), Oligophrenin-1-like (OPHN1L) or GRAF1, is a GAP with activity towards RhoA and Cdc42 and is only weakly active towards Rac1. It influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase (FAK), which is a critical component of integrin signaling. It is essential for the major clathrin-independent endocytic pathway mediated by pleiomorphic membranes. GRAF contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212997 Cd Length: 56 Bit Score: 46.65 E-value: 1.79e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQvDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12064     4 KALYACKAEHDSELSFTAGTVFD-NVHPSQEPGWLEGTLNGKTGLIPENYVE 54

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 46.69 E-value: 1.81e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGEWW-------TGsigeRTGIFPSNYVRP 1024
Cdd:cd11784     2 CVALHSYSAHRPEELELQKGEGVRVLGKFQEGWlrglslvTG----RVGIFPSNYVSP 55

Chromosome segregation ATPase Smc [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 440809 [Multi-domain] Cd Length: 983 Bit Score: 53.02 E-value: 1.82e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  366 DKRKANYERGNMELEKRRQVLMEQQQR--EAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRK 443
Cdd:COG1196   270 EELRLELEELELELEEAQAEEYELLAElaRLEQDIARLEERRRELEERLEELEEELAELEEELEELEEELEELEEELEEA 349

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  444 EIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTE 523
Cdd:COG1196   350 EEELEEAEAELAEAEEALLEAEAELAEAEEELEELAEELLEALRAAAELAAQLEELEEAEEALLERLERLEEELEELEEA 429

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  524 LEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLvpEKQLLNERIKNMQLSNTPDSGISLLHKKSSEKEelcqRLKEQLDAL 603
Cdd:COG1196   430 LAELEEEEEEEEEALEEAAEEEAELEEEEEAL--LELLAELLEEAALLEAALAELLEELAEAAARLL----LLLEAEADY 503

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  604 EKETASKLSEMDSFNNQLKCGSMDdcVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQ 683
Cdd:COG1196   504 EGFLEGVKAALLLAGLRGLAGAVA--VLIGVEAAYEAALEAALAAALQNIVVEDDEVAAAAIEYLKAAKAGRATFLPLDK 581

                         330       340       350       360       370
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  684 IQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEkSQDKTQEEERKAEAK 739
Cdd:COG1196   582 IRARAALAAALARGAIGAAVDLVASDLREADARYYVLGDT-LLGRTLVAARLEAAL 636

Src Homology 3 domain of SH3 domain-binding protein 4; SH3 domain-binding protein 4 (SH3BP4) is also called transferrin receptor trafficking protein (TTP). SH3BP4 is an endocytic accessory protein that interacts with endocytic proteins including clathrin and dynamin, and regulates the internalization of the transferrin receptor (TfR). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212691 Cd Length: 52 Bit Score: 46.55 E-value: 1.86e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11757     1 EVVAIKDYCPTNFTTLKFSKGDHLYVLDTSGGEWWYAHNTTEMGYIPSSYVQ 52

Third Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. The third SH3 domain of Sla1p can bind ubiquitin while retaining the ability to bind proline-rich ligands; monoubiquitination of target proteins signals internalization and sorting through the endocytic pathway. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212709 [Multi-domain] Cd Length: 57 Bit Score: 46.54 E-value: 1.87e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMN-KDDPDWW--QGETNGLTGLFPSNYVK 1170
Cdd:cd11775     2 RGKVLYDFDAQSDDELTVKEGDVVYILDdKKSKDWWmvENVSTGKEGVVPASYIE 56

Third Src homology 3 domain (or SH3C) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. The SH3C of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212772 [Multi-domain] Cd Length: 52 Bit Score: 46.25 E-value: 1.92e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11838     3 IALYPYESNEPGDLTFNAGDVILVTKKDGEWWTGTIGDRTGIFPSNYVRP 52

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 46.56 E-value: 1.93e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGK-----FGWFPCNYVEK 803
Cdd:cd11839     3 QVIAPFTATAENQLSLAVGQLVLVRKKS--PSGWWEGELQARgkkrqIGWFPANYVKL 58

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 46.17 E-value: 2.02e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIG-ERTGIFPSNYV 1022
Cdd:cd11825     4 ALYDYRAQRPDELSFCKHAIITnVEKEDGGWWRGDYGgKKQKWFPANYV 52

Fifth Src homology 3 domain (or SH3E) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212929 [Multi-domain] Cd Length: 54 Bit Score: 46.51 E-value: 2.04e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHVKL 1102
Cdd:cd11996     9 YTANNEDELSFSKGQLINVLNKDDPDWWQGEING-----VTGLFPSNYVKM 54

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 46.19 E-value: 2.07e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDpDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11990     4 ALCSWTAKKDNHLNFSKNDIITVLEQQE-NWWFGEVHGGRGWFPKSYVKL 52

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 52.07 E-value: 2.08e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  486 SSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLiylvpekQLLNER 565
Cdd:COG4942    19 ADAAAEAEAELEQLQQEIAELEKELAALKKEEKALLKQLAALERRIAALARRIRALEQELAALEAEL-------AELEKE 91

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  566 IKNMQlsntpdsgisllhkksSEKEELCQRLKEQLDALEK-ETASKLSEM---DSFNNQLKCGSMDDCVLQCllsllscl 641
Cdd:COG4942    92 IAELR----------------AELEAQKEELAELLRALYRlGRQPPLALLlspEDFLDAVRRLQYLKYLAPA-------- 147

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  642 nnlfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQ-IQKKKLEDEAARKAKQgkenlwRESIRKEEEEKQKRL 720
Cdd:COG4942   148 ------RREQAEELRADLAELAALRAELEAERAELEALLAELeEERAALEALKAERQKL------LARLEKELAELAAEL 215

                         250       260       270       280
                  ....*....|....*....|....*....|....*....|..
gi 312176401  721 QEEKSQDKTQE------EERKAEAKQSETASALVNYRALYPF 756
Cdd:COG4942   216 AELQQEAEELEaliarlEAEAAAAAERTPAAGFAALKGKLPW 257

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 46.48 E-value: 2.08e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11927     3 AKALYNYEGKEPGDLKFSKGDIIILRRQvDENWYHGEVNGIHGFFPTNFVQI 54

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 46.15 E-value: 2.11e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE-TNGLTGLFPSNYVKM 1171
Cdd:cd11770     2 YEALSDFQAEQEGDLSFKKGEVLRIISKRADGWWLAEnSKGNRGLVPKTYLKV 54

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 46.21 E-value: 2.37e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11974     3 AEALWDHVTMDDQELAFKAGDVIRVLEaSNKDWWWGRNEDREAWFPASFVRL 54

Src homology 3 domain of SH3 domain containing Ysc84-like 1 (SH3YL1) protein; SH3YL1 localizes to the plasma membrane and is required for dorsal ruffle formation. It binds phosphoinositides (PIs) with high affinity through its N-terminal SYLF domain (also called DUF500). In addition, SH3YL1 contains a C-terminal SH3 domain which has been reported to bind to N-WASP, dynamin 2, and SHIP2 (a PI 5-phosphatase). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212775 Cd Length: 54 Bit Score: 46.23 E-value: 2.43e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11841     4 ALYSFEGQQPCDLSFQAGDRITVLTRTDSQFDWWEGRLRGRVGIFPANYV 53

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 46.11 E-value: 2.53e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11919     2 PARAKFDFKAQTLKELPLQKGDIVYIYKQIDQNWYEGEHHGRVGIFPRSYIEL 54

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 51.69 E-value: 2.58e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  469 QELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQcdleimeIKQLQQELKEy 548
Cdd:COG4942    30 EQLQQEIAELEKELAALKKEEKALLKQLAALERRIAALARRIRALEQELAALEAELAELEKE-------IAELRAELEA- 101

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  549 qnkliylvpEKQLLNERIKNMQLSNTPDSGISLLHKKSSEK--------EELCQRLKEQLDALEKETASklsemdsfnnq 620
Cdd:COG4942   102 ---------QKEELAELLRALYRLGRQPPLALLLSPEDFLDavrrlqylKYLAPARREQAEELRADLAE----------- 161

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  621 lkcgsmddcvlqcllsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKR------LEQIQKKKLEDEAA 694
Cdd:COG4942   162 ---------------------------LAALRAELEAERAELEALLAELEEERAALEALKaerqklLARLEKELAELAAE 214

                         250       260       270
                  ....*....|....*....|....*....|...
gi 312176401  695 RKAKQGKENLWRESIRKEEEEKQKRLQEEKSQD 727
Cdd:COG4942   215 LAELQQEAEELEALIARLEAEAAAAAERTPAAG 247

Src homology 3 domains of the p47phox subunit of NADPH oxidase and similar domains; This family is composed of the tandem SH3 domains of p47phox subunit of NADPH oxidase and Nox Organizing protein 1 (NoxO1), the four SH3 domains of Tks4 (Tyr kinase substrate with four SH3 domains), the five SH3 domains of Tks5, the SH3 domain of obscurin, Myosin-I, and similar domains. Most members of this group also contain Phox homology (PX) domains, except for obscurin and Myosin-I. p47phox and NoxO1 are regulators of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) and nonphagocytic NADPH oxidase Nox1, respectively. They play roles in the activation of their respective NADPH oxidase, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Obscurin is a giant muscle protein that plays important roles in the organization and assembly of the myofibril and the sarcoplasmic reticulum. Type I myosins (Myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212790 [Multi-domain] Cd Length: 53 Bit Score: 46.09 E-value: 2.69e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 933
Cdd:cd11856     4 AIADYEAQGDDEISLQEGEVVEVLEKNDSgWWYVRKGDKEGWVPASYLE 52

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 45.97 E-value: 2.79e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1122 AMYDYMANNEDE-LNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11829     4 TLYAFTGEQHQQgLSFEAGELIRVLQAPDGGWWEGEKDGLRGWFPASYV 52

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 45.97 E-value: 2.85e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKD-GE--WWTGSIGERTGIFPSNYV 1022
Cdd:cd12056     6 ALFHYEGTNEDELDFKEGEIILIISKDtGEpgWWKGELNGKEGVFPDNFV 55

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 45.84 E-value: 3.02e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401  743 TASALVNYRALYPfearnhDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11828     1 LAEALWDHVTMDP------EELGFKAGDVIEVLDMS--DKDWWWGSIRDEEGWFPASFV 51

First Src Homology 3 domain (SH3A) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CD2AP. SH3A binds to the PXXXPR motif present in c-Cbl and the cytoplasmic domain of cell adhesion protein CD2. Its interaction with CD2 anchors CD2 at sites of cell contact. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212986 Cd Length: 56 Bit Score: 45.99 E-value: 3.02e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  754 YPFEARNHDEMSFSSGDIIQvDEKTVGEPGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:cd12053     6 YDYDAVHEDELTIRVGEIIR-NVKKLEEEGWLEGELNGRRGMFPDNFVKEI 55

RIM-binding protein of the cytomatrix active zone; This is a family of proteins that form part of the CAZ (cytomatrix at the active zone) complex which is involved in determining the site of synaptic vesicle fusion. The C-terminus is a PDZ-binding motif that binds directly to RIM (a small G protein Rab-3A effector). The family also contains four coiled-coil domains.

Pssm-ID: 431111 [Multi-domain] Cd Length: 766 Bit Score: 52.13 E-value: 3.15e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   348 YQKTQEEEPQKKLPVTFE--DKRKANYERGNMELEKRRQVL-------MEQQQREAER-------------KAQKEKEEW 405
Cdd:pfam10174  219 NQLQPDPAKTKALQTVIEmkDTKISSLERNIRDLEDEVQMLktngllhTEDREEEIKQmevykshskfmknKIDQLKQEL 298

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   406 ERKQRELqeqewkkqLELEKRLEkqrelerqreeerrKEIERREAAKQELErqrrlewerlRRQELLSQKtrEQEDIVrL 485
Cdd:pfam10174  299 SKKESEL--------LALQTKLE--------------TLTNQNSDCKQHIE----------VLKESLTAK--EQRAAI-L 343

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   486 SSRKKSLHLELEA----VNGKHQQisgrLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLiyLVPEKQL 561
Cdd:pfam10174  344 QTEVDALRLRLEEkesfLNKKTKQ----LQDLTEEKSTLAGEIRDLKDMLDVKERKINVLQKKIENLQEQL--RDKDKQL 417

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   562 --LNERIKNMQL-SNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKEtasKLSEMDSFNNQLKCGSMDDCVLQCLLSLL 638
Cdd:pfam10174  418 agLKERVKSLQTdSSNTDTALTTLEEALSEKERIIERLKEQREREDRE---RLEELESLKKENKDLKEKVSALQPELTEK 494

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   639 SCLnnlfllLKELREsyNTQQLALEQLHKIKRDKLKEIErkrleqIQKKKleDEAARKAKQGKENLWRESIRKEEEEKQK 718
Cdd:pfam10174  495 ESS------LIDLKE--HASSLASSGLKKDSKLKSLEIA------VEQKK--EECSKLENQLKKAHNAEEAVRTNPEIND 558

                          410       420
                   ....*....|....*....|.
gi 312176401   719 RLQE-EKSQDKTQEEERKAEA 738
Cdd:pfam10174  559 RIRLlEQEVARYKEESGKAQA 579

Src Homology 3 domain of Membrane Protein, Palmitoylated 7 (or MAGUK p55 subfamily member 7); MPP7 is a scaffolding protein that binds to DLG1 and promotes tight junction formation and epithelial cell polarity. Mutations in the MPP7 gene may be associated with the pathogenesis of diabetes and extreme bone mineral density. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212966 Cd Length: 61 Bit Score: 46.17 E-value: 3.19e-06

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1120 VIAMYDYMAN-------NEDELNFSKGQLINVMNKDDPDWWQ----GETNGLTGLFPSNY 1168
Cdd:cd12033     2 IKALFDYNPNedkaipcKEAGLSFKKGDILQIMSQDDATWWQakheGDANPRAGLIPSKH 61

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 45.57 E-value: 3.28e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11833     3 VALYKFKPQENEDLEMRPGDKITLLDDSNEDWWKGKIEDRVGFFPANFV 51

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 45.70 E-value: 3.29e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGE--PGWLYGSFQG-KFGWFPCNYVE 802
Cdd:cd11864     3 RAEYDFVAESEDELSFRAGDKLRLAPKELQPrvRGWLLATVDGqKIGLVPANYVK 57

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 45.78 E-value: 3.32e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1051 AYAASGTEQLSLAPGQLI-LILKKNTSGWWQGELQargKKRQKGWFPASHVK 1101
Cdd:cd11779     8 PHAAGGETQLSFEEGDVItLLGPEPRDGWHYGENE---RSGRRGWFPIAYTE 56

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 45.85 E-value: 3.37e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYVK 1170
Cdd:cd11783     2 YVALYPYKPQKPDELELRKGEMYTVTEKCQDGWFKGTSlrTGQSGVFPGNYVQ 54

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 45.79 E-value: 3.55e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12076     4 TVIYPYTARDQDEINLEKGAVVEVIQKNLEGWWKIRYQGKEGWAPASYLK 53

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 45.66 E-value: 3.63e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELqargkKRQKGWFPASHVKLL 1103
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGKDNDGWWEGET-----GGRVGLVPSTAVEEI 54

Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk); TXK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal cysteine-rich region. Rlk is expressed in T-cells and mast cell lines, and is a key component of T-cell receptor (TCR) signaling. It is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212840 [Multi-domain] Cd Length: 55 Bit Score: 45.72 E-value: 3.77e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETN-GLTGLFPSNYV 1169
Cdd:cd11907     2 QVKALYDFLPREPSNLALKRAEEYLILEQYDPHWWKARDRyGNEGLIPSNYV 53

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 45.80 E-value: 3.78e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  881 NLKAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11901     1 NLPAYVKFNYTAEREDELSLVKGTKVIVMEKcSDGWWRGSYNGQVGWFPSNYV 53

C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 2 (Stac2); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac2 contains a single SH3 domain at the C-terminus unlike Stac1 and Stac3, which contain two C-terminal SH3 domains. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212918 Cd Length: 53 Bit Score: 45.71 E-value: 3.85e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11985     3 VALYKFLPQENNDLPLQPGDRVMVVDDSNEDWWKGKSGDRVGFFPANFVQ 52

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 45.25 E-value: 4.23e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11815     3 VVLHDFPAEHSDDLSLNSGEIVYLLEKiDTEWYRGKCKNTTGIFPANHVK 52

Src homology 3 domain of Src kinase-like Protein Tyrosine Kinases; Src subfamily members include Src, Lck, Hck, Blk, Lyn, Fgr, Fyn, Yrk, Yes, and Brk. Src (or c-Src) proteins are cytoplasmic (or non-receptor) PTKs which are anchored to the plasma membrane. They contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation sites. Src proteins are involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. They were identified as the first proto-oncogene products, and they regulate cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Src kinases are overexpressed in a variety of human cancers, making them attractive targets for therapy. They are also implicated in acute inflammatory responses and osteoclast function. Src, Fyn, Yes, and Yrk are widely expressed, while Blk, Lck, Hck, Fgr, Lyn, and Brk show a limited expression pattern. This subfamily also includes Drosophila Src42A, Src oncogene at 42A (also known as Dsrc41) which accumulates at sites of cell-cell or cell-matrix adhesion, and participates in Drosphila development and wound healing. It has been shown to promote tube elongation in the tracheal system, is essential for proper cell-cell matching during dorsal closure, and regulates cell-cell contacts in developing Drosophila eyes. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212779 [Multi-domain] Cd Length: 52 Bit Score: 45.27 E-value: 4.40e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  749 NYRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQ--GKFGWFPCNY 800
Cdd:cd11845     1 IYVALYDYEARTDDDLSFKKGDRLQILDDSDGD--WWLARHLstGKEGYIPSNY 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also have roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212880 [Multi-domain] Cd Length: 52 Bit Score: 45.17 E-value: 4.47e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11947     1 EARGKFDFTASGEDELSFKKGDVLKILSSDDIWFKAELNGEEGYVPKNFV 50

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 45.39 E-value: 4.59e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYV 932
Cdd:cd11826     1 KVVALYDYTADKDDELSFQEGDIIYVTKKNDDgWYEGVLNGVTGLFPGNYV 51

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 45.38 E-value: 4.64e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYG-SFQGKFGWFPCNYVE 802
Cdd:cd11767     3 VALYPFTGENDEELSFEKGERLEIIEKPEDDPDWWKArNALGTTGLVPRNYVE 55

Src Homology 3 domain of Pak Interactive eXchange factors; PIX proteins are Rho guanine nucleotide exchange factors (GEFs), which activate small GTPases by exchanging bound GDP for free GTP. They act as GEFs for both Cdc42 and Rac 1, and have been implicated in cell motility, adhesion, neurite outgrowth, and cell polarity. Vertebrates contain two proteins from the PIX subfamily, alpha-PIX and beta-PIX. Alpha-PIX, also called ARHGEF6, is localized in dendritic spines where it regulates spine morphogenesis. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. Beta-PIX play roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212810 [Multi-domain] Cd Length: 53 Bit Score: 45.38 E-value: 4.68e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVKL 1102
Cdd:cd11877     1 LVRAKFNFEGTNEDELSFDKGDIITVTQVVEGGWWEGTLNGK-----TGWFPSNYVKE 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 45.34 E-value: 4.73e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  748 VNYRALYPFEARNHDEMSFSSG-DIIQVDEKTvgEPGWLYGSFQ-GKFGWFPCNYVE 802
Cdd:cd11997     2 VRVRALYDYTGQEADELSFKAGeELLKIGEED--EQGWCKGRLLsGRIGLYPANYVE 56

Src Homology 3 domain of Membrane Protein, Palmitoylated 5 (or MAGUK p55 subfamily member 5); MPP5, also called PALS1 (Protein associated with Lin7) or Nagie oko protein in zebrafish or Stardust in Drosophila, is a scaffolding protein which associates with Crumbs homolog 1 (CRB1), CRB2, or CRB3 through its PDZ domain and with PALS1-associated tight junction protein (PATJ) or multi-PDZ domain protein 1 (MUPP1) through its L27 domain. The resulting tri-protein complexes are core proteins of the Crumb complex, which localizes at tight junctions or subapical regions, and is involved in the maintenance of apical-basal polarity in epithelial cells and the morphogenesis and function of photoreceptor cells. MPP5 is critical for the proper stratification of the retina and is also expressed in T lymphocytes where it is important for TCR-mediated activation of NFkB. Drosophila Stardust exists in several isoforms, some of which show opposing functions in photoreceptor cells, which suggests that the relative ratio of different Crumbs complexes regulates photoreceptor homeostasis. MPP5 contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212969 Cd Length: 63 Bit Score: 45.48 E-value: 4.76e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401 1126 YMANNEDELNFSKGQLINVMNKDDPDWWQG-----ETNG-LTGLFPS 1166
Cdd:cd12036    15 YIPCRELGLSFQKGDILHVISQEDPNWWQAyregeEDNQsLAGLIPS 61

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 45.40 E-value: 4.80e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDD---PDWWQGETNGLTGLFPSN 1167
Cdd:cd11954     3 VYALWDYEAQNADELSFQEGDAITILRRKDdseTEWWWARLNDKEGYVPKN 53

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 45.49 E-value: 4.81e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSY--SSVEPGDLTFTEGEEILVTQKDGEWWTG--SIGErTGIFPSNYVR 1023
Cdd:cd11855     4 ALYPYdaSPDDPNELSFEKGEILEVSDTSGKWWQArkSNGE-TGICPSNYLQ 54

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 45.38 E-value: 4.84e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHV 1100
Cdd:cd11902     3 AFVKFAYVAEREDELSLVKGSRVTVMEKCSDGWWRGSYNG-----QIGWFPSNYV 52

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 45.10 E-value: 5.05e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11959     2 AVALYDYQAADDDEISFDPDDIITNIEMiDEGWWRGVCRGKYGLFPANYVEL 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 45.44 E-value: 5.09e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEK--TVGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11800     2 YYALYTFEARSPGELSVTEGQVVTVLEKhdLKGNPEWWLVEDRGKQGYVPSNYLAK 57

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 45.43 E-value: 5.15e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTG---SIGErTGIFPSNYVRP 1024
Cdd:cd12006     3 FVALYDYEARTEDDLSFHKGEKFqILNSSEGDWWEArslTTGE-TGYIPSNYVAP 56

Src Homology 3 domain of Nephrocystin (or Nephrocystin-1); Nephrocystin contains an SH3 domain involved in signaling pathways that regulate cell adhesion and cytoskeletal organization. It is a protein that in humans is associated with juvenile nephronophthisis, an inherited kidney disease characterized by renal fibrosis that lead to chronic renal failure in children. It is localized in cell-cell junctions in renal duct cells, and is known to interact with Ack1, an activated Cdc42-associated kinase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212704 [Multi-domain] Cd Length: 54 Bit Score: 45.00 E-value: 5.20e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGE--EILVTQKDGeWWTG--SIGERtGIFPSNYVRP 1024
Cdd:cd11770     2 YEALSDFQAEQEGDLSFKKGEvlRIISKRADG-WWLAenSKGNR-GLVPKTYLKV 54

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 51.60 E-value: 5.29e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  367 KRKANYERGNM-----ELEKRRQVLMEQQQREAERKAQKEKEEWERKQ----------------RELQEQEwkkQLELEK 425
Cdd:PRK03918  379 KRLTGLTPEKLekeleELEKAKEEIEEEISKITARIGELKKEIKELKKaieelkkakgkcpvcgRELTEEH---RKELLE 455

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  426 RLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQ-KTREQE----DIVRLSSRKKSLHLELEAVN 500
Cdd:PRK03918  456 EYTAELKRIEKELKEIEEKERKLRKELRELEKVLKKESELIKLKELAEQlKELEEKlkkyNLEELEKKAEEYEKLKEKLI 535

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  501 GKHQQISGRLQDVQiRKQTQKTELEVLDKqcdleimEIKQLQQELKEYQNKLIYLVPEK-QLLNERIKnmQLSNTPDSGI 579
Cdd:PRK03918  536 KLKGEIKSLKKELE-KLEELKKKLAELEK-------KLDELEEELAELLKELEELGFESvEELEERLK--ELEPFYNEYL 605

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  580 SLLHKKS--SEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKcgsmddcvlqcllsllsclnnlflllkELRESYNt 657
Cdd:PRK03918  606 ELKDAEKelEREEKELKKLEEELDKAFEELAETEKRLEELRKELE---------------------------ELEKKYS- 657

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  658 qqlalEQLHKIKRDKL----KEIERKRLEQIQKKKLEDEAARKAKQGKENL-WRESIRKEEEEKQK---RLQE--EKSQD 727
Cdd:PRK03918  658 -----EEEYEELREEYlelsRELAGLRAELEELEKRREEIKKTLEKLKEELeEREKAKKELEKLEKaleRVEElrEKVKK 732

                         410       420
                  ....*....|....*....|
gi 312176401  728 KTQEEERKAEAKQSETASAL 747
Cdd:PRK03918  733 YKALLKERALSKVGEIASEI 752

C-terminal Src homology 3 domain of GRB2-related adaptor protein 2; GRAP2 is also called GADS (GRB2-related adapter downstream of Shc), GrpL, GRB2L, Mona, or GRID (Grb2-related protein with insert domain). It is expressed specifically in the hematopoietic system. It plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. It also has roles in antigen-receptor and tyrosine kinase mediated signaling. GRAP2 is unique from other GRB2-like adaptor proteins in that it can be regulated by caspase cleavage. It contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domain of GRAP2 binds to different motifs found in substrate peptides including the typical PxxP motif in hematopoietic progenitor kinase 1 (HPK1), the RxxK motif in SLP-76 and HPK1, and the RxxxxK motif in phosphatase-like protein HD-PTP. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212883 [Multi-domain] Cd Length: 53 Bit Score: 45.20 E-value: 5.30e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11950     2 VRALYDFEALEDDELGFNSGDVIEVLDSSNpSWWKGRLHGKLGLFPANYVA 52

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 45.19 E-value: 5.39e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  972 EDYIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGE-RTGIFPSNYVRPK 1025
Cdd:cd11905     1 EIVVAMYDFQPTEPHDLRLETGEEYVILEKnDVHWWKARDKYgKEGYIPSNYVTGK 56

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 45.03 E-value: 5.65e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  754 YPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11901     8 FNYTAEREDELSLVKGTKVIVMEKC--SDGWWRGSYNGQVGWFPSNYV 53

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 45.23 E-value: 5.66e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDP--DWWQGETNGLTGLFPSNYV 1169
Cdd:cd12044     4 GLWDCFGDNPDELSFQRGDLIYILSKEYNmyGWWVGELNGIVGIVPKDYL 53

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 3; GRAF3 is also called Rho GTPase activating protein 42 (ARHGAP42) or ARHGAP10-like. Though its function has not been characterized, it may be a GAP with activity towards RhoA and Cdc42, based on its similarity to GRAF and GRAF2. It contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212999 Cd Length: 55 Bit Score: 45.05 E-value: 5.82e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLI-NVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd12066     1 QAKAMYSCKAEHSHELSFPQGAIFsNVYPSVEPGWLKATYEGKTGLVPENYV 52

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 45.02 E-value: 5.82e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11781     1 KARALYPFKAQSAKELSLKKGDIIYIRRQiDKNWYEGEHNGRVGIFPASYVEI 53

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 45.24 E-value: 5.87e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGSIGER------TGIFPSNYV 1022
Cdd:cd11847     2 YKALWDFKARGDEELSFQAGDQFRIAERSGDWWTALKLDRaggvvaQGFVPNNYL 56

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 45.18 E-value: 5.87e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGE--TNGLTGLFPSNYV 1169
Cdd:cd11889     2 VKAVYSWAGETEGDLGFLEGDLIEVLSIGDGSWWSGKlrRNGAEGIFPSNFV 53

C-terminal Src Homology 3 domain of the Nebulin family of proteins; Nebulin family proteins contain multiple nebulin repeats, and may contain an N-terminal LIM domain and/or a C-terminal SH3 domain. They have molecular weights ranging from 34 to 900 kD, depending on the number of nebulin repeats, and they all bind actin. They are involved in the regulation of actin filament architecture and function as stabilizers and scaffolds for cytoskeletal structures with which they associate, such as long actin filaments or focal adhesions. Nebulin family proteins that contain a C-terminal SH3 domain include the giant filamentous protein nebulin, nebulette, Lasp1, and Lasp2. Lasp2, also called LIM-nebulette, is an alternatively spliced variant of nebulette. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212723 [Multi-domain] Cd Length: 55 Bit Score: 45.00 E-value: 5.93e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIgERT---GIFPSNYVRP 1024
Cdd:cd11789     1 RYRAMYDYAAADDDEVSFQEGDVIInVEIIDDGWMEGTV-QRTgqsGMLPANYVEL 55

Second Src homology 3 domain (or SH3B) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212922 [Multi-domain] Cd Length: 52 Bit Score: 45.09 E-value: 6.08e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKtvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11989     3 QALYPWRAKKDNHLNFNKNDVITVLEQ---QDMWWFGEVQGQKGWFPKSYVK 51

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 45.02 E-value: 6.14e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGE--EILVTQKDGeWWTGSIGERTGIFPSNYV 1022
Cdd:cd11874     4 VLFSYTPQNEDELELKVGDtiEVLGEVEEG-WWEGKLNGKVGVFPSNFV 51

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 51.28 E-value: 6.25e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   349 QKTQEEEPQKKLPVTFEDKRKANYERGNMElEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQleleKRLE 428
Cdd:pfam17380  404 VKILEEERQRKIQQQKVEMEQIRAEQEEAR-QREVRRLEEERAREMERVRLEEQERQQQVERLRQQEEERKR----KKLE 478

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   429 KQreleRQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKslhlELEAVNGKHQQISG 508
Cdd:pfam17380  479 LE----KEKRDRKRAEEQRRKILEKELEERKQAMIEEERKRKLLEKEMEERQKAIYEEERRR----EAEEERRKQQEMEE 550

                          170       180       190       200
                   ....*....|....*....|....*....|....*....|.
gi 312176401   509 RLQ-DVQIRKQT-QKTELEVLDKQCDL--EIMEIKQLQQEL 545
Cdd:pfam17380  551 RRRiQEQMRKATeERSRLEAMEREREMmrQIVESEKARAEY 591

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 44.81 E-value: 6.26e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSF-QGKFGWFPCNYV 801
Cdd:cd11812     4 ALYDYTANRSDELTIHRGDIIRVLYKD--NDNWWFGSLvNGQQGYFPANYV 52

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 44.83 E-value: 6.34e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFG-WFPCNYVEKV 804
Cdd:cd11969     3 KALYDYRAKRSDELSFCKGALIHNVSKETG--GWWKGDYGGKVQhYFPSNYVEDV 55

Caldesmon;

Pssm-ID: 460421 [Multi-domain] Cd Length: 495 Bit Score: 50.64 E-value: 6.36e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   388 EQQQREAE-RKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRKEIerreaAKQELERQRRLEWERL 466
Cdd:pfam02029   10 ERRRRAREeRRRQKEEEEPSGQVTESVEPNEHNSYEEDSELKPSGQGGLDEEEAFLDRT-----AKREERRQKRLQEALE 84

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   467 RRQELLSQKTREQEDIvrlSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDleimEIKQLQQELK 546
Cdd:pfam02029   85 RQKEFDPTIADEKESV---AERKENNEEEENSSWEKEEKRDSRLGRYKEEETEIREKEYQENKWST----EVRQAEEEGE 157

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   547 EyqnkliylVPEKQLLNERIKnmqlsntpdsgisllhKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQlkcGSM 626
Cdd:pfam02029  158 E--------EEDKSEEAEEVP----------------TENFAKEEVKDEKIKKEKKVKYESKVFLDQKRGHPEV---KSQ 210

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   627 DDCVLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQ-LHKIKRdKLKEIERKRLEQIQKKKLE-----DEAARKAKQG 700
Cdd:pfam02029  211 NGEEEVTKLKVTTKRRQGGLSQSQEREEEAEVFLEAEQkLEELRR-RRQEKESEEFEKLRQKQQEaelelEELKKKREER 289

                          330       340       350       360
                   ....*....|....*....|....*....|....*....|
gi 312176401   701 KENLWRESIRK--EEEEKQKRLQEEKSQDKTQEEERKAEA 738
Cdd:pfam02029  290 RKLLEEEEQRRkqEEAERKLREEEEKRRMKEEIERRRAEA 329

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 44.81 E-value: 6.56e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKdDPDWWQGE--TNGLTGLFPSNYVKM 1171
Cdd:cd12005     1 LVVALYSYEPSHDGDLGFEKGEKLRILEQ-SGEWWKAQslTTGQEGFIPFNFVAK 54

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase and similar proteins; This subfamily is composed of Rho GTPase activating proteins (GAPs) with similarity to GRAF. Members contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. Although vertebrates harbor four Rho GAPs in the GRAF subfamily including GRAF, GRAF2, GRAF3, and Oligophrenin-1 (OPHN1), only three are included in this model. OPHN1 contains the BAR, PH and GAP domains, but not the C-terminal SH3 domain. GRAF and GRAF2 show GAP activity towards RhoA and Cdc42. GRAF influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase. GRAF2 regulates caspase-activated p21-activated protein kinase-2. The SH3 domain of GRAF and GRAF2 binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212815 [Multi-domain] Cd Length: 54 Bit Score: 44.98 E-value: 6.74e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11882     4 ALYACKAEDESELSFEPGQIITNVQPSDEpgWLEGTLNGRTGLIPENYVEF 54

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 44.93 E-value: 7.38e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ--QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11830     2 AKARYDFCARDMRELSLKEGDVVKIYNKkgQQGWWRGEINGRIGWFPSTYVE 53

Second or C-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212955 [Multi-domain] Cd Length: 53 Bit Score: 44.83 E-value: 7.48e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGSIGERTGIFPSNYV 1022
Cdd:cd12022     2 YITIKAYTAVEEDELTLLEGEAIEVIHKllDG-WWVVRKGEVTGYFPSMYL 51

cell envelope integrity inner membrane protein TolA; Provisional

Pssm-ID: 236545 [Multi-domain] Cd Length: 387 Bit Score: 50.19 E-value: 7.53e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  658 QQLALEQLHKI--KRDKLKEIERKRLEQIQKKKLEDEAARKA----KQGKENLWR--ESIRKEEEEKQKRLQEEKSQDKt 729
Cdd:PRK09510   86 QQQAEELQQKQaaEQERLKQLEKERLAAQEQKKQAEEAAKQAalkqKQAEEAAAKaaAAAKAKAEAEAKRAAAAAKKAA- 164

                          90
                  ....*....|....*..
gi 312176401  730 QEEERKAEAKQSETASA 746
Cdd:PRK09510  165 AEAKKKAEAEAAKKAAA 181

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 44.69 E-value: 7.55e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGS--IGERTGIFPSNYVRP 1024
Cdd:cd11783     2 YVALYPYKPQKPDELELRKGEMYTVTEKcqDG-WFKGTslRTGQSGVFPGNYVQP 55

Src homology 3 domain of Src-Like Adaptor Proteins; SLAPs are adaptor proteins with limited similarity to Src family tyrosine kinases. They contain an N-terminal SH3 domain followed by an SH2 domain, and a unique C-terminal sequence. They function in regulating the signaling, ubiquitination, and trafficking of T-cell receptor (TCR) and B-cell receptor (BCR) components. Vertebrates contain two SLAPs, named SLAP (or SLA1) and SLAP2 (or SLA2). SLAP has been shown to interact with the EphA receptor, EpoR, Lck, PDGFR, Syk, CD79a, among others, while SLAP2 interacts with CSF1R. Both SLAPs interact with c-Cbl, LAT, CD247, and Zap70. SLAP modulates TCR surface expression levels as well as surface and total BCR levels. As an adaptor to c-Cbl, SLAP increases the ubiquitination, intracellular retention, and targeted degradation of the BCR complex components. SLAP2 plays a role in c-Cbl-dependent regulation of CSF1R, a tyrosine kinase important for myeloid cell growth and differentiation. The SH3 domain of SLAP forms a complex with v-Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212782 Cd Length: 55 Bit Score: 44.87 E-value: 7.87e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTgSIGERTG---IFPSNYV 1022
Cdd:cd11848     3 VALGDYPSGGPAELSLRLGEPLTIVSDEGDWWK-VLSEVTGresYIPSVHV 52

Src Homology 3 domain of Tec (Tyrosine kinase expressed in hepatocellular carcinoma); Tec is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. It is more widely-expressed than other Tec subfamily kinases. Tec is found in endothelial cells, both B- and T-cells, and a variety of myeloid cells including mast cells, erythroid cells, platelets, macrophages and neutrophils. Tec is a key component of T-cell receptor (TCR) signaling, and is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212838 [Multi-domain] Cd Length: 56 Bit Score: 44.81 E-value: 7.98e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQG-ETNGLTGLFPSNYV 1169
Cdd:cd11905     3 VVAMYDFQPTEPHDLRLETGEEYVILEKNDVHWWKArDKYGKEGYIPSNYV 53

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 44.58 E-value: 8.00e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGW-----LYGSFQGKFGWFPCNY 800
Cdd:cd11883     3 VALYDFTPKSKNQLSFKAGDIIYVLNK--DPSGWwdgviISSSGKVKRGWFPSNY 55

C2 domain second repeat present in Synaptotagmin; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. There are several classes of Synaptotagmins. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 175975 [Multi-domain] Cd Length: 134 Bit Score: 47.19 E-value: 8.00e-06

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSM---GSQSYT--TRTLQDTLNPKWnfNCQFFIK----DLYQDVLCLTMFDR 1627
Cdd:cd00276    14 ERLTVVVLKARNLPPSDGKGLSDPYVKVSLlqgGKKLKKkkTSVKKGTLNPVF--NEAFSFDvpaeQLEEVSLVITVVDK 91

                          90       100
                  ....*....|....*....|....
gi 312176401 1628 DQFSPDDFLGRTEVPVAKIRTEQE 1651
Cdd:cd00276    92 DSVGRNEVIGQVVLGPDSGGEELE 115

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 44.81 E-value: 8.03e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11948     4 ALYSFQATESDELPFQKGDILKILNME-DDQNWYKAELQGREGYIPKNYIK 53

First or N-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the first SH3 domain (or N-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212954 [Multi-domain] Cd Length: 53 Bit Score: 44.56 E-value: 8.07e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12021     2 YRAIADYEKSSKSEMALKTGDVVEVVEKS--ENGWWFCQLKAKRGWVPASYLE 52

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 44.62 E-value: 8.10e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  882 LKAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:cd11920     1 LPARAVYDFKAQTSKELSFKKGDTVYILRKiDQNWYEGEHHGRVGIFPISYVEKL 55

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 50.84 E-value: 8.22e-06

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   365 EDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQ---RELQEQEWKKQLELEKRLEKQRELERQREEER 441
Cdd:TIGR02169  170 RKKEKALEELEEVEENIERLDLIIDEKRQQLERLRREREKAERYQallKEKREYEGYELLKEKEALERQKEAIERQLASL 249

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   442 RKEIERREAAKQELERQrrleweRLRRQELLSQKTRE-----QEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQir 516
Cdd:TIGR02169  250 EEELEKLTEEISELEKR------LEEIEQLLEELNKKikdlgEEEQLRVKEKIGELEAEIASLERSIAEKERELEDAE-- 321

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   517 KQTQKTELEvLDKQcdleIMEIKQLQQELKEYQNKLIylvpekQLLNERIKNMQLSNTPDSGISLLHKKSSE-KEELCQR 595
Cdd:TIGR02169  322 ERLAKLEAE-IDKL----LAEIEELEREIEEERKRRD------KLTEEYAELKEELEDLRAELEEVDKEFAEtRDELKDY 390

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   596 lKEQLDALEKETASKLSEMDSFNNQLKCGSMDDCVLQCLlsllsclnnlfllLKELREsyntQQLALEQLHKIKRDKLKE 675
Cdd:TIGR02169  391 -REKLEKLKREINELKRELDRLQEELQRLSEELADLNAA-------------IAGIEA----KINELEEEKEDKALEIKK 452

                          330       340       350       360       370       380       390
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   676 IERKrLEQIQKKKledeaaRKAKQGKENLwresirkeeEEKQKRLQEEKSQDKTQEEERKAEAKQSETAS 745
Cdd:TIGR02169  453 QEWK-LEQLAADL------SKYEQELYDL---------KEEYDRVEKELSKLQRELAEAEAQARASEERV 506

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 44.64 E-value: 8.37e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHV 1100
Cdd:cd11901     4 AYVKFNYTAEREDELSLVKGTKVIVMEKCSDGWWRGSYNGQ-----VGWFPSNYV 53

Src Homology 3 domain of Membrane Protein, Palmitoylated 6 (or MAGUK p55 subfamily member 6); MPP6, also called Veli-associated MAGUK 1 (VAM-1) or PALS2, is a scaffolding protein that binds to Veli-1, a homolog of Caenorhabditis Lin-7. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212971 Cd Length: 61 Bit Score: 44.67 E-value: 8.86e-06

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|..
gi 312176401 1131 EDELNFSKGQLINVMNKDDPDWWQG---ETNGLTGLFPSNYV 1169
Cdd:cd12038    20 EAGLKFSKGEILQIVNREDPNWWQAshvKEGGSAGLIPSQFL 61

Variant SH3 domain; SH3 (Src homology 3) domains are often indicative of a protein involved in signal transduction related to cytoskeletal organization. First described in the Src cytoplasmic tyrosine kinase. The structure is a partly opened beta barrel.

Pssm-ID: 429575 [Multi-domain] Cd Length: 54 Bit Score: 44.51 E-value: 9.03e-06

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:pfam07653    2 GRVIFDYVGTDKNGLTLKKGDVVKVLGK--DNDGWWEGETGGRVGLVPSTAVEEI 54

Src Homology 3 domain of Tec-like Protein Tyrosine Kinases; The Tec (Tyrosine kinase expressed in hepatocellular carcinoma) subfamily is composed of Tec, Btk, Bmx (Etk), Itk (Tsk, Emt), Rlk (Txk), and similar proteins. They are cytoplasmic (or nonreceptor) tyr kinases containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. Most Tec subfamily members (except Rlk) also contain an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation. In addition, some members contain the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. Tec kinases are expressed mainly by haematopoietic cells, although Tec and Bmx are also found in endothelial cells. B-cells express Btk and Tec, while T-cells express Itk, Txk, and Tec. Collectively, Tec kinases are expressed in a variety of myeloid cells such as mast cells, platelets, macrophages, and dendritic cells. Each Tec kinase shows a distinct cell-type pattern of expression. The function of Tec kinases in lymphoid cells have been studied extensively. They play important roles in the development, differentiation, maturation, regulation, survival, and function of B-cells and T-cells. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212702 [Multi-domain] Cd Length: 54 Bit Score: 44.57 E-value: 9.27e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGE-RTGIFPSNYVRP 1024
Cdd:cd11768     3 VALYDFQPIEPGDLPLEKGEEYVVLDDSNEhWWRARDKNgNEGYIPSNYVTE 54

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 44.33 E-value: 9.81e-06

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTG---SIGeRTGIFPSNYVRP 1024
Cdd:cd12008     2 FVALYDYESRTETDLSFKKGERLqIVNNTEGDWWLAhslTTG-QTGYIPSNYVAP 55

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase; GRAF, also called Rho GTPase activating protein 26 (ARHGAP26), Oligophrenin-1-like (OPHN1L) or GRAF1, is a GAP with activity towards RhoA and Cdc42 and is only weakly active towards Rac1. It influences Rho-mediated cytoskeletal rearrangements and binds focal adhesion kinase (FAK), which is a critical component of integrin signaling. It is essential for the major clathrin-independent endocytic pathway mediated by pleiomorphic membranes. GRAF contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212997 Cd Length: 56 Bit Score: 44.33 E-value: 1.01e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLI-NVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12064     5 ALYACKAEHDSELSFTAGTVFdNVHPSQEPGWLEGTLNGKTGLIPENYVE 54

C2 domain second repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); plant subset; MCTPs are involved in Ca2+ signaling at the membrane. Plant-MCTPs are composed of a variable N-terminal sequence, four C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176024 [Multi-domain] Cd Length: 121 Bit Score: 46.54 E-value: 1.05e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1558 RLMVHVIEATELkackPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNfncQFFI--KDLYQ-DVLCLTMFDRDqFSPDD 1634
Cdd:cd08378     1 YLYVRVVKARGL----PANSNDPVVEVKLGNYKGSTKAIERTSNPEWN---QVFAfsKDRLQgSTLEVSVWDKD-KAKDD 72

                          90
                  ....*....|....
gi 312176401 1635 FLGR-----TEVPV 1643
Cdd:cd08378    73 FLGGvcfdlSEVPT 86

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 2; BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The related proteins, BAIAP2L1 and IRSp53, function as regulators of membrane dynamics and the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212847 [Multi-domain] Cd Length: 59 Bit Score: 44.42 E-value: 1.08e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  885 QALCSWTAKKeNH--LNFSKHDVITVL--EQQENWWFGEVHGG--RGWFPKSYVK 933
Cdd:cd11914     4 RAIVSHPAGS-NPtlLRFNRGDIITVLvpEARNGWLYGKLEGSsrQGWFPEAYVK 57

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 44.22 E-value: 1.09e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  754 YPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11902     7 FAYVAEREDELSLVKGSRVTVMEKC--SDGWWRGSYNGQIGWFPSNYV 52

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 44.16 E-value: 1.11e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTGSIGERTGIFPSNYV 1022
Cdd:cd11976     4 ARYDFCARDRSELSLKEGDIIKILNKKGQqgWWRGEIYGRVGWFPANYV 52

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 44.27 E-value: 1.13e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQV---DEktvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11804     3 VAKHDFKATAEDELSFKKGSILKVlnmED----DPNWYKAELDGKEGLIPKNYI 52

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 44.04 E-value: 1.14e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11948     1 EAVALYSFQATESDELPFQKGDILKILnmEDDQNWYKAELQGREGYIPKNYIKV 54

Src Homology 3 domain of Membrane Protein, Palmitoylated 1 (or MAGUK p55 subfamily member 1); MPP1, also called 55 kDa erythrocyte membrane protein (p55), is a ubiquitously-expressed scaffolding protein that plays roles in regulating neutrophil polarity, cell shape, hair cell development, and neural development and patterning of the retina. It was originally identified as an erythrocyte protein that stabilizes the actin cytoskeleton to the plasma membrane by forming a complex with 4.1R protein and glycophorin C. MPP1 is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains the three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213013 Cd Length: 62 Bit Score: 44.56 E-value: 1.15e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1122 AMYDY-------MANNEDELNFSKGQLINVMNKDDPDWWQGETNG----LTGLFPS 1166
Cdd:cd12080     4 AQFDYdpkkdnlIPCKEAGLKFQTGDIIQIINKDDSNWWQGRVEGsgeeSAGLIPS 59

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 44.29 E-value: 1.21e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11824     1 KYSVLYDYTAQEDDELSISKGDVVAVIEKGEDgWWTVERNGQKGLVPGTYLEK 53

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 44.62 E-value: 1.23e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11973    20 AEALWDHVTMDDQELGFKAGDVIEVMDaTNKEWWWGRVLDSEGWFPASFVRL 71

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 44.18 E-value: 1.25e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIG--ERTGIFPSNYVR 1023
Cdd:cd11924     2 EAVAQYTFKGDLEVELSFRKGEHIcLIRKVNENWYEGRITgtGRQGIFPASYVQ 55

C-terminal (or second) Src homology 3 domain of VAV1 protein; VAV1 is expressed predominantly in the hematopoietic system and it plays an important role in the development and activation of B and T cells. It is activated by tyrosine phosphorylation to function as a guanine nucleotide exchange factor (GEF) for Rho GTPases following cell surface receptor activation, triggering various effects such as cytoskeletal reorganization, transcription regulation, cell cycle progression, and calcium mobilization. It also serves as a scaffold protein and has been shown to interact with Ku70, Socs1, Janus kinase 2, SIAH2, S100B, Abl gene, ZAP-70, SLP76, and Syk, among others. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The C-terminal SH3 domain of Vav1 interacts with a wide variety of proteins including cytoskeletal regulators (zyxin), RNA-binding proteins (Sam68), transcriptional regulators, viral proteins, and dynamin 2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212909 [Multi-domain] Cd Length: 54 Bit Score: 44.16 E-value: 1.26e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILIL-KKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd11976     8 FCARDRSELSLKEGDIIKILnKKGQQGWWRGEIYGR-----VGWFPANYVE 53

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 44.20 E-value: 1.29e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11991     4 AMYTYESNEQGDLTFQQGDVILVTKKDGDWWTGTVGDKTGVFPSNYVRP 52

Trichohyalin-plectin-homology domain; This family is a mixtrue of two different families of eukaryotic proteins. Trichoplein or mitostatin, was first defined as a meiosis-specific nuclear structural protein. It has since been linked with mitochondrial movement. It is associated with the mitochondrial outer membrane, and over-expression leads to reduction in mitochondrial motility whereas lack of it enhances mitochondrial movement. The activity appears to be mediated through binding the mitochondria to the actin intermediate filaments (IFs). The family is in the trichohyalin-plectin-homology domain.

Pssm-ID: 464007 [Multi-domain] Cd Length: 341 Bit Score: 49.15 E-value: 1.32e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   377 MELEKRRQVLMEQQQREAErKAQKEKEEWERKQRELQEQEWKKQLElEKRLEKQrelerqreeerrkeierREAAKQELE 456
Cdd:pfam13868   39 KEEERRLDEMMEEERERAL-EEEEEKEEERKEERKRYRQELEEQIE-EREQKRQ-----------------EEYEEKLQE 99

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   457 RQRRLEWERLRRQEllsqktrEQEDIVRLSSRKKSLHLELEAVNgkhqqisgRLQDVQIRKQTQKTELEvldkqcDLEIM 536
Cdd:pfam13868  100 REQMDEIVERIQEE-------DQAEAEEKLEKQRQLREEIDEFN--------EEQAEWKELEKEEEREE------DERIL 158

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   537 E-IKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLsntpdsgisLLHKKSSEKEELCQRL-----KEQLDALEKETASK 610
Cdd:pfam13868  159 EyLKEKAEREEEREAEREEIEEEKEREIARLRAQQE---------KAQDEKAERDELRAKLyqeeqERKERQKEREEAEK 229

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   611 LSEMdsfnnqlkcgsmddcvlqcllsllsclnnlfllLKELRESYnTQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLE 690
Cdd:pfam13868  230 KARQ---------------------------------RQELQQAR-EEQIELKERRLAEEAEREEEEFERMLRKQAEDEE 275

                          330       340       350       360       370
                   ....*....|....*....|....*....|....*....|....*....|....
gi 312176401   691 DEAARKAKQGKENL-WRESIRKEEEEKQKRLQEEKSQD-KTQEEERKAEAKQSE 742
Cdd:pfam13868  276 IEQEEAEKRRMKRLeHRRELEKQIEEREEQRAAEREEElEEGERLREEEAERRE 329

Third Src homology 3 domain (or SH3C) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (or SH3C) of ITSN1 has been shown to bind many proteins including dynamin1/2, CIN85, c-Cbl, SHIP2, Reps1, synaptojanin-1, and WNK, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212924 Cd Length: 52 Bit Score: 43.82 E-value: 1.34e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11991     2 YVAMYTYESNEQGDLTFQQGDVILVTKK---DGDWWTGTVGDKTGVFPSNYV 50

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 43.88 E-value: 1.35e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11782     1 EARAKYNFNADTGVELSFRKGDVITLTRRvDENWYEGRIGGRQGIFPVSYVQ 52

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212777 [Multi-domain] Cd Length: 53 Bit Score: 43.95 E-value: 1.36e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGE-WWTGSIGERTGIFPSNYV 1022
Cdd:cd11843     4 ALYDYEGQESDELSFKAGDILTkLEEEDEQgWCKGRLDGRVGLYPANYV 52

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 44.16 E-value: 1.37e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11894     3 KALYDYEGQTDDELSFPEGAIIRIlNKENQDDDGFWEGEFNGRIGVFPSVLVE 55

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 43.90 E-value: 1.39e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQE-----NWWFGEVHGGRGWFPKSY 931
Cdd:cd11800     4 ALYTFEARSPGELSVTEGQVVTVLEKHDlkgnpEWWLVEDRGKQGYVPSNY 54

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 44.02 E-value: 1.40e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTG--SIGERtGIFPSNYVR 1023
Cdd:cd11962     3 VVLYDYEKDEDNEIELVEGEIVTnIEMVDEDWWMGtnSKGES-GLFPSNYVE 53

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 44.19 E-value: 1.42e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD----DPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11895     4 ALYSYTGQSPEELSFPEGALIRLLPRAqdgvDDGFWRGEFGGRVGVFPSLLVE 56

Third Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212946 Cd Length: 61 Bit Score: 43.91 E-value: 1.50e-05

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1119 QVIAMYDY-------MANNEDELNFSKGQLINVMNKDDPD-WWQGETNGLTGLFPSNYVK 1170
Cdd:cd12013     1 RMVALFDYdpresspNVDAEVELSFRAGDIITVFGEMDEDgFYYGELNGQRGLVPSNFLE 60

Third Src Homology 3 domain of Nck adaptor proteins; This group contains the third SH3 domain of Nck, the first SH3 domain of Caenorhabditis elegans Ced-2 (Cell death abnormality protein 2), and similar domains. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. Ced-2 is a cell corpse engulfment protein that interacts with Ced-5 in a pathway that regulates the activation of Ced-10, a Rac small GTPase.

Pssm-ID: 212701 [Multi-domain] Cd Length: 56 Bit Score: 43.84 E-value: 1.51e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK---DGEWWTG--SIGErTGIFPSNYV 1022
Cdd:cd11767     3 VALYPFTGENDEELSFEKGERLEIIEKpedDPDWWKArnALGT-TGLVPRNYV 54

C-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The C-terminal SH3 domains (SH3c) of the related proteins, GRB2 and GRAP2, have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212884 Cd Length: 53 Bit Score: 44.02 E-value: 1.53e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11951     3 QAQYDFSAEDPSQLSFRRGDIIEVLDCP--DPNWWRGRISGRVGFFPRNYV 51

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 44.19 E-value: 1.55e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-----DGEWWTGSIGERTGIFPS 1019
Cdd:cd11895     4 ALYSYTGQSPEELSFPEGALIRLLPRaqdgvDDGFWRGEFGGRVGVFPS 52

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 49.56 E-value: 1.58e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   337 QVDSVNGTLPSYQKTQEEEPQKKLpVTFEDKRKANYERGNMELEKRRQVLMEQQQREAE--RKAQKEKEEWERKQRELQE 414
Cdd:pfam15709  301 QTFVVTGNMESEEERSEEDPSKAL-LEKREQEKASRDRLRAERAEMRRLEVERKRREQEeqRRLQQEQLERAEKMREELE 379

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   415 QEWKKQLElEKRLEKQREL-ERQREEERRKEIERREAAKQELERQrRLEWERLRRQELlsQKTREQEDIVRLSSRKKSLH 493
Cdd:pfam15709  380 LEQQRRFE-EIRLRKQRLEeERQRQEEEERKQRLQLQAAQERARQ-QQEEFRRKLQEL--QRKKQQEEAERAEAEKQRQK 455

                          170       180       190       200       210
                   ....*....|....*....|....*....|....*....|....*....|.
gi 312176401   494 LELEAVNGKHQQISGRLQDVQIRKQTQKTELEvldKQCDLEIMEIKQLQQE 544
Cdd:pfam15709  456 ELEMQLAEEQKRLMEMAEEERLEYQRQKQEAE---EKARLEAEERRQKEEE 503

C2 domain found in the Human chromosome 21 open reading frame 25 (C21orf25) protein; The members in this cd are named after the Human C21orf25 which contains a single C2 domain. Several other members contain a C1 domain downstream of the C2 domain. No other information on this protein is currently known. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176060 [Multi-domain] Cd Length: 126 Bit Score: 45.82 E-value: 1.59e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKpnGKSNPYCEVSMGS--QSYTTRTLQDTLNPKWNfncQFFIKDLYQD--VLCLTMFDRDQFSPDD 1634
Cdd:cd08678     1 LLVKNIKANGLSEAA--GSSNPYCVLEMDEppQKYQSSTQKNTSNPFWD---EHFLFELSPNskELLFEVYDNGKKSDSK 75

                          90       100
                  ....*....|....*....|....*..
gi 312176401 1635 FLGRTEVPVAKIRteqesKGPTTRRLL 1661
Cdd:cd08678    76 FLGLAIVPFDELR-----KNPSGRQIF 97

Second Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212857 Cd Length: 56 Bit Score: 43.80 E-value: 1.61e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT--GLFPSNYVKM 1171
Cdd:cd11924     2 EAVAQYTFKGDLEVELSFRKGEHICLIRKVNENWYEGRITGTGrqGIFPASYVQV 56

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 2; BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The related proteins, BAIAP2L1 and IRSp53, function as regulators of membrane dynamics and the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212847 [Multi-domain] Cd Length: 59 Bit Score: 44.03 E-value: 1.65e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  760 NHDEMSFSSGDIIQVdekTVGEP--GWLYGSFQG--KFGWFPCNYVEKV 804
Cdd:cd11914    14 NPTLLRFNRGDIITV---LVPEArnGWLYGKLEGssRQGWFPEAYVKAL 59

Src homology 3 domain of Lck Protein Tyrosine Kinase; Lck is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lck is expressed in T-cells and natural killer cells. It plays a critical role in T-cell maturation, activation, and T-cell receptor (TCR) signaling. Lck phosphorylates ITAM (immunoreceptor tyr activation motif) sequences on several subunits of TCRs, leading to the activation of different second messenger cascades. Phosphorylated ITAMs serve as binding sites for other signaling factor such as Syk and ZAP-70, leading to their activation and propagation of downstream events. In addition, Lck regulates drug-induced apoptosis by interfering with the mitochondrial death pathway. The apototic role of Lck is independent of its primary function in T-cell signaling. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212938 [Multi-domain] Cd Length: 54 Bit Score: 43.66 E-value: 1.70e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTG---SIGERtGIFPSNYV 1022
Cdd:cd12005     3 VALYSYEPSHDGDLGFEKGEKLRILEQSGEWWKAqslTTGQE-GFIPFNFV 52

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 43.85 E-value: 1.71e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  972 EDYIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11972     3 EKVVAIYDYTKDKEDELSFQEGAIIYVIKKnDDGWYEGVMNGVTGLFPGNYV 54

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 43.84 E-value: 1.72e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  882 LKAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 933
Cdd:cd12060     2 LVVKARFNFKQTNEDELSVCKGDIIYVTRVEEGgWWEGTLNGKTGWFPSNYVR 54

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 1; ASAP1 is also called DDEF1 (Development and Differentiation Enhancing Factor 1), AMAP1, centaurin beta-4, or PAG2. an Arf GTPase activating protein (GAP) with activity towards Arf1 and Arf5 but not Arf6. However, it has been shown to bind GTP-Arf6 stably without GAP activity. It has been implicated in cell growth, migration, and survival, as well as in tumor invasion and malignancy. It binds paxillin and cortactin, two components of invadopodia which are essential for tumor invasiveness. It also binds focal adhesion kinase (FAK) and the SH2/SH3 adaptor CrkL. ASAP1 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212898 [Multi-domain] Cd Length: 57 Bit Score: 43.84 E-value: 1.75e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|
gi 312176401  987 DLTFTEGEEILVT-QKDGEWWTGSI---GERTGIFPSNYV 1022
Cdd:cd11965    15 ELTFVEGEVIIVTgEEDQEWWIGHIegqPERKGVFPVSFV 54

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 49.56 E-value: 1.76e-05

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401   672 KLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERK 735
Cdd:pfam15709  346 RRLEVERKRREQEEQRRLQQEQLERAEKMREELELEQQRRFEEIRLRKQRLEEERQRQEEEERK 409

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 43.86 E-value: 1.84e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILI-LKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd11978     2 IAIARYDFCARDMRELSLLKGDVVKIyTKMSTNGWWRGEVNGR-----VGWFPSTYVE 54

Src Homology 3 domain of Mixed Lineage Kinase 4; MLK4 is a Serine/Threonine Kinase (STK), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. The specific function of MLK4 is yet to be determined. Mutations in the kinase domain of MLK4 have been detected in colorectal cancers. MLK4 contains an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212991 [Multi-domain] Cd Length: 58 Bit Score: 43.78 E-value: 1.85e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTS-----GWWQGELQARgkkrqKGWFPASHV 1100
Cdd:cd12058     8 YEASGEDELSLRRGDVVEVLSQDAAvsgddGWWAGKIRHR-----LGIFPANYV 56

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 43.80 E-value: 1.88e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYV 1169
Cdd:cd11926     3 VAIYPYTPRKEDELELRKGEMFLVFERCQDGWFKGTSmhTSKIGVFPGNYV 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. Also included in this subfamily is the second C-terminal SH3 domain of Rho guanine nucleotide exchange factor 37 (ARHGEF37), whose function is still unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212734 [Multi-domain] Cd Length: 57 Bit Score: 43.51 E-value: 1.97e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-----DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11800     2 YYALYTFEARSPGELSVTEGQVVTVLEKhdlkgNPEWWLVEDRGKQGYVPSNYLAK 57

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 43.64 E-value: 1.99e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12046     4 ALFSYEASQPEDLEFQKGDVILVLSKVNED--WLEGQCKGKIGIFPSAFVE 52

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 43.39 E-value: 1.99e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1045 IAQVTSAYAASGTEQLSLAPGQLILIL-KKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd11830     1 TAKARYDFCARDMRELSLKEGDVVKIYnKKGQQGWWRGEINGR-----IGWFPSTYVE 53

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 43.52 E-value: 2.02e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  973 DYIALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYV 1022
Cdd:cd11824     1 KYSVLYDYTAQEDDELSISKGDVVAVIEKGEDgWWTVERNGQKGLVPGTYL 51

First Src Homology 3 domain of SH3 domain containing ring finger protein 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212860 Cd Length: 54 Bit Score: 43.40 E-value: 2.03e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11927     4 KALYNYEGKEPGDLKFSKGDIIilrrQVDEN------WYHGEVNGIHGFFPTNFVQ 53

C-terminal Src Homology 3 domain of LIM and SH3 domain protein 1; Lasp1 is a cytoplasmic protein that binds focal adhesion proteins and is involved in cell signaling, migration, and proliferation. It is overexpressed in several cancer cells including breast, ovarian, bladder, and liver. In cancer cells, it can be found in the nucleus; its degree of nuclear localization correlates with tumor size and poor prognosis. Lasp1 is a 36kD protein containing an N-terminal LIM domain, two nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212867 [Multi-domain] Cd Length: 59 Bit Score: 43.83 E-value: 2.07e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  971 GEDYIALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIgERT---GIFPSNYV 1022
Cdd:cd11934     2 GKRYRAVYDYNAADEDEVSFQDGDTIVnVQQIDDGWMYGTV-ERTgdtGMLPANYV 56

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 43.46 E-value: 2.10e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11982     4 MAVKPYQSQAEGEISLSKGEKIKVLSVGEGGFWEGQVKGRVGWFPSDCV 52

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 43.24 E-value: 2.12e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNY 800
Cdd:cd11817     4 ALYDFTGETEEDLSFQRGDRILVTEHLDAE--WSRGRLNGREGIFPRAF 50

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 43.48 E-value: 2.13e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHG-GR----GWFPKSYVKL 934
Cdd:cd11839     2 AQVIAPFTATAENQLSLAVGQLVLVRKKSPSgWWEGELQArGKkrqiGWFPANYVKL 58

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 43.45 E-value: 2.15e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGET--NGLTGLFPSNYV 1169
Cdd:cd11925     4 LALYAYKPQKNDELELRKGEMYRVIEKCQDGWFKGTSlrTGVSGVFPGNYV 54

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 43.35 E-value: 2.15e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  977 LYSYSSVEPGDLTFTEGEEILVTQK---DGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd12057     5 LFPYEAQNEDELTIKEGDIVTLISKdciDAGWWEGELNGRRGVFPDNFVK 54

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 49.38 E-value: 2.24e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  378 ELEKRRQVLMEQQQREAE-RKAQKEKEEWERKQRELQEQEWKKQLELEkRLEKQRELERQREEERrkeierreAAKQEL- 455
Cdd:COG4717    72 ELKELEEELKEAEEKEEEyAELQEELEELEEELEELEAELEELREELE-KLEKLLQLLPLYQELE--------ALEAELa 142

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  456 ---ERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKH-QQISGRLQDVQIRKQTQKTELEVLDKqc 531
Cdd:COG4717   143 elpERLEELEERLEELRELEEELEELEAELAELQEELEELLEQLSLATEEElQDLAEELEELQQRLAELEEELEEAQE-- 220

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  532 dleimEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLsntpdSGISLLHKKSSEKEELCQRLKEQLDA--------- 602
Cdd:COG4717   221 -----ELEELEEELEQLENELEAAALEERLKEARLLLLIA-----AALLALLGLGGSLLSLILTIAGVLFLvlgllallf 290

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  603 --LEKETASKLSEMDSFNNQLKCGSMDDcvLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKlKEIERKR 680
Cdd:COG4717   291 llLAREKASLGKEAEELQALPALEELEE--EELEELLAALGLPPDLSPEELLELLDRIEELQELLREAEELE-EELQLEE 367

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  681 LEQIQKKKL-------EDEAARKAKQGKEnlwRESIRKEEEEKQKRLQEEKS-----QDKTQEEERKAEAKQSETA 744
Cdd:COG4717   368 LEQEIAALLaeagvedEEELRAALEQAEE---YQELKEELEELEEQLEELLGeleelLEALDEEELEEELEELEEE 440

Src Homology 3 domain of Bbc1 and similar domains; This subfamily is composed of Saccharomyces cerevisiae Bbc1p, also called Mti1p (Myosin tail region-interacting protein), and similar proteins. Bbc1p interacts with and regulates type I myosins in yeast, Myo3p and Myo5p, which are involved in actin cytoskeletal reorganization. It also binds and inhibits Las17, a WASp family protein that functions as an activator of the Arp2/3 complex. Bbc1p contains an N-terminal SH3 domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212820 [Multi-domain] Cd Length: 60 Bit Score: 43.49 E-value: 2.29e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQG-----KFGWFPCNYVEK 803
Cdd:cd11887     5 KALYPYESDHEDDLNFDVGQLITVTEEEDAD--WYFGEYVDsngntKEGIFPKNFVEV 60

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 43.46 E-value: 2.29e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKVL 805
Cdd:cd11972     7 AIYDYTKDKEDELSFQEGAIIYVIKKN--DDGWYEGVMNGVTGLFPGNYVESIM 58

First Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the first C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212845 [Multi-domain] Cd Length: 55 Bit Score: 43.37 E-value: 2.31e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQ--GETNGLTGLFPSNYVKM 1171
Cdd:cd11912     4 VLYDYTASGDDEVSISEGEEVTVLEPDDGSGWTkvRNGSGEEGLVPTSYIEI 55

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 43.53 E-value: 2.35e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvgEPG--WLYGSFQG-KFGWFPCNYVE 802
Cdd:cd11858     2 YKALYDFAGSVANELSLKKDDIVYIVQK---EDNgwWLAKKLDEsKEGWVPAAYLE 54

Third Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212717 [Multi-domain] Cd Length: 55 Bit Score: 43.54 E-value: 2.36e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGS--FQGKFGWFPCNYV 801
Cdd:cd11783     2 YVALYPYKPQKPDELELRKGEMYTVTEKCQD--GWFKGTslRTGQSGVFPGNYV 53

First Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212861 Cd Length: 54 Bit Score: 43.37 E-value: 2.40e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11928     4 KALYSYEGKEPGDLKFNKGDIIILRRKV--DENWYHGELNGCHGFLPASYIQ 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 43.49 E-value: 2.41e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLE---QQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11875     1 KARVLFDYEAENEDELTLREGDIVTILSkdcEDKGWWKGELNGKRGVFPDNFVEP 55

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 43.46 E-value: 2.41e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvGEpgWLYGSFQGKFGWFPCNYV 801
Cdd:cd11992     2 YIALYPYSSSEPGDLTFNEGEEILVTQKD-GE--WWTGSIEDRTGIFPSNYV 50

C2 domain first repeat in Copine; There are 2 copies of the C2 domain present in copine, a protein involved in membrane trafficking, protein-protein interactions, and perhaps even cell division and growth. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176013 [Multi-domain] Cd Length: 120 Bit Score: 45.25 E-value: 2.54e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1577 KSNPYCEVSM---GSQSYT----TRTLQDTLNPkwNFNCQFFIKDLYQDV--LCLTMFDRDQFSPD----DFLGRTEVPV 1643
Cdd:cd04048    20 KSDPFVVVYVktgGSGQWVeigrTEVIKNNLNP--DFVTTFTVDYYFEEVqkLRFEVYDVDSKSKDlsdhDFLGEAECTL 97

                          90       100
                  ....*....|....*....|....*
gi 312176401 1644 AKIrteQESKGPTTRRLLLHEVPTG 1668
Cdd:cd04048    98 GEI---VSSPGQKLTLPLKGGKGKG 119

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing proteins, also called TULA (T cell Ubiquitin LigAnd) family of proteins; UBASH3 or TULA proteins are also referred to as Suppressor of T cell receptor Signaling (STS) proteins. They contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. In some vertebrates, there are two TULA family proteins, called UBASH3A (also called TULA or STS-2) and UBASH3B (also called TULA-2 or STS-1), which show partly overlapping as well as distinct functions. UBASH3B is widely expressed while UBASH3A is only found in lymphoid cells. UBASH3A facilitates apoptosis induced in T cells through its interaction with the apoptosis-inducing factor AIF. UBASH3B is an active phosphatase while UBASH3A is not. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212725 [Multi-domain] Cd Length: 59 Bit Score: 43.44 E-value: 2.63e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401 1117 VCQVIamYDYMANNEDELNFSKGQLINVMNKD---DPDWWQGETN---GLTGLFPSNYV 1169
Cdd:cd11791     1 VLRVL--YPYTPQEEDELELVPGDYIYVSPEEldsSSDGWVEGTSwltGCSGLLPENYT 57

Second or C-terminal Src homology 3 domain of NADPH oxidase (Nox) Organizing protein 1; Nox Organizing protein 1 (NoxO1) is a critical regulator of enzyme kinetics of the nonphagocytic NADPH oxidase Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Nox1 is expressed in colon, stomach, uterus, prostate, and vascular smooth muscle cells. NoxO1 is involved in targeting activator subunits (such as NoxA1) to Nox1. It is co-localized with Nox1 in the membranes of resting cells and directs the subcellular localization of Nox1. NoxO1 contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of NoxO1. The tandem SH3 domains of NoxO1 interact with the PRR of p22phox, which also complexes with Nox1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212957 Cd Length: 53 Bit Score: 43.09 E-value: 2.65e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12024     4 ATRAYEAQKEDELSVPAGVVVEVLQKSDNGWWLIRYNGRAGYVPSMYLQ 52

Src homology 3 domain of Lyn Protein Tyrosine Kinase; Lyn is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Lyn is expressed in B lymphocytes and myeloid cells. It exhibits both positive and negative regulatory roles in B cell receptor (BCR) signaling. Lyn, as well as Fyn and Blk, promotes B cell activation by phosphorylating ITAMs (immunoreceptor tyr activation motifs) in CD19 and in Ig components of BCR. It negatively regulates signaling by its unique ability to phosphorylate ITIMs (immunoreceptor tyr inhibition motifs) in cell surface receptors like CD22 and CD5. Lyn also plays an important role in G-CSF receptor signaling by phosphorylating a variety of adaptor molecules. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212937 [Multi-domain] Cd Length: 56 Bit Score: 43.44 E-value: 2.68e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMnKDDPDWWQGE--TNGLTGLFPSNYV 1169
Cdd:cd12004     2 VVALYPYDGIHEDDLSFKKGEKLKVI-EEHGEWWKARslTTKKEGFIPSNYV 52

C2 domain of Perforin; Perforin contains a single copy of a C2 domain in its C-terminus and plays a role in lymphocyte-mediated cytotoxicity. Mutations in perforin leads to familial hemophagocytic lymphohistiocytosis type 2. The function of perforin is calcium dependent and the C2 domain is thought to confer this binding to target cell membranes. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175998 [Multi-domain] Cd Length: 127 Bit Score: 45.33 E-value: 2.75e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1555 GIGRLMVHVIEATELkackpNG----KSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQ-DVLCLTMFDRDQ 1629
Cdd:cd04032    26 GLATLTVTVLRATGL-----WGdyftSTDGYVKVFFGGQEKRTEVIWNNNNPRWNATFDFGSVELSPgGKLRFEVWDRDN 100

                          90
                  ....*....|....
gi 312176401 1630 FSPDDFLGRTEVPV 1643
Cdd:cd04032   101 GWDDDLLGTCSVVP 114

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 43.00 E-value: 2.84e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  748 VNYRALYPFEARNHDEMSFSSGD-IIQVDEKTvgEPGWLYG-SFQGKFGWFPCNYVE 802
Cdd:cd11999     2 VRVRAVYDYTGQEPDELSFKAGEeLLKVEDED--EQGWCKGvTDGGAVGLYPANYVE 56

Src homology 3 domain of Cortactin and related proteins; This subfamily includes cortactin, Abp1 (actin-binding protein 1), hematopoietic lineage cell-specific protein 1 (HS1), and similar proteins. These proteins are involved in regulating actin dynamics through direct or indirect interaction with the Arp2/3 complex, which is required to initiate actin polymerization. They all contain at least one C-terminal SH3 domain. Cortactin and HS1 bind Arp2/3 and actin through an N-terminal region that contains an acidic domain and several copies of a repeat domain found in cortactin and HS1. Abp1 binds actin via an N-terminal actin-depolymerizing factor (ADF) homology domain. Yeast Abp1 binds Arp2/3 directly through two acidic domains. Mammalian Abp1 does not directly interact with Arp2/3; instead, it regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. The C-terminal region of these proteins acts as an adaptor or scaffold that can connect membrane trafficking and signaling proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212753 [Multi-domain] Cd Length: 54 Bit Score: 43.07 E-value: 2.87e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGElqarGKKRQKGWFPASHVKL 1102
Cdd:cd11819     8 YQAAEDNEISFVEGDIITQIEQIDEGWWLGV----NAKGQKGLFPANYVEL 54

Src homology 3 domain of ARHGEF9-like Rho guanine nucleotide exchange factors; Members of this family contain a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. They include the Rho guanine nucleotide exchange factors ARHGEF9, ASEF (also called ARHGEF4), ASEF2, and similar proteins. GEFs activate small GTPases by exchanging bound GDP for free GTP. ARHGEF9 specifically activates Cdc42, while both ASEF and ASEF2 can activate Rac1 and Cdc42. ARHGEF9 is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. ASEF plays a role in angiogenesis and cell migration. ASEF2 is important in cell migration and adhesion dynamics. ASEF exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli), leading to the activation of Rac1 or Cdc42. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212762 [Multi-domain] Cd Length: 53 Bit Score: 43.14 E-value: 2.89e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401 1058 EQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVKL 1102
Cdd:cd11828    14 EELGFKAGDVIEVLDMSDKDWWWGSIRDE-----EGWFPASFVRL 53

First Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the first SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213007 [Multi-domain] Cd Length: 53 Bit Score: 43.16 E-value: 2.95e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1048 VTSAYAASGTEQLSLAPGQLILILKKNTSGWWqgelqARGKKRQKGWFPASHV 1100
Cdd:cd12074     4 VVSNYEKQENSEISLQAGEVVDVIEKNESGWW-----FVSTAEEQGWVPATYL 51

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 43.08 E-value: 2.97e-05

                          10        20        30
                  ....*....|....*....|....*....|....*....
gi 312176401  898 LNFSKHDVITVL----EQQENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11884    16 LSFHKGDVIKLLpkegPLDPGWLFGTLDGRSGAFPKEYV 54

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 42.78 E-value: 2.98e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11816     3 VARFDFEGEQEDELSFSEGDVItLKEYVGEEWAKGELNGKIGIFPLNFV 51

Pleckstrin homology (PH) domain; PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 275388 [Multi-domain] Cd Length: 92 Bit Score: 44.07 E-value: 2.99e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1425 HSGKLYKT-----KSNKELHAFLFNDFLLLtylvrqfaaasgheklFNSKSSAQFRmYKTPIFLNEVLVKLPTDPSSDEP 1499
Cdd:cd00821     1 KEGYLLKRgggglKSWKKRWFVLFEGVLLY----------------YKSKKDSSYK-PKGSIPLSGILEVEEVSPKERPH 63

                          90       100
                  ....*....|....*....|....*....
gi 312176401 1500 VFHISH-IDRVYTLRTDNINERTAWVQKI 1527
Cdd:cd00821    64 CFELVTpDGRTYYLQADSEEERQEWLKAL 92

Src Homology 3 domain of Membrane Protein, Palmitoylated 1 (or MAGUK p55 subfamily member 1)-like proteins; This subfamily includes MPP1, CASK (Calcium/calmodulin-dependent Serine protein Kinase), Caenorhabditis elegans lin-2, and similar proteins. MPP1 and CASK are scaffolding proteins from the MAGUK (membrane-associated guanylate kinase) protein family, which is characterized by the presence of a core of three domains: PDZ, SH3, and guanylate kinase (GuK). In addition, they also have the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. CASK and lin-2 also contain an N-terminal calmodulin-dependent kinase (CaMK)-like domain and two L27 domains. MPP1 is ubiquitously-expressed and plays roles in regulating neutrophil polarity, cell shape, hair cell development, and neural development and patterning of the retina. CASK is highly expressed in the mammalian nervous system and plays roles in synaptic protein targeting, neural development, and gene expression regulation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212968 Cd Length: 62 Bit Score: 43.19 E-value: 3.04e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1120 VIAMYDYMANNED-------ELNFSKGQLINVMNKDDPDWWQ----GETNGLTGLFPS 1166
Cdd:cd12035     2 VRAQFDYDPSKDDlipcqqaGIAFKTGDILQIISKDDHNWWQarkpGASKEPAGLIPS 59

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 42.96 E-value: 3.19e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQ---ENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:cd12057     3 KVLFPYEAQNEDELTIKEGDIVTLISKDcidAGWWEGELNGRRGVFPDNFVKLL 56

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 42.76 E-value: 3.23e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11806     4 AIADFVATDDSQLSFESGDKLLVLRKpSVDWWWAEHNGCCGYIPASHL 51

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 42.99 E-value: 3.24e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11921     5 LKFDFQAQSPKELTLQKGDIVYIHKEVDKNWLEGEHHGRVGIFPANYVEV 54

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 42.87 E-value: 3.26e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDD----PDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12141     4 AVYTFKARSPNELSVSANQRVRILEFSDltgnKEWWLAEANGQKGYVPSNYIR 56

First Src homology 3 domain (or SH3A) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN2 is expected to bind many protein partners, similar to ITSN1 which has been shown to bind Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212921 [Multi-domain] Cd Length: 57 Bit Score: 42.94 E-value: 3.27e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11988     6 ALYPFEARNHDEMSFNAGDIIQVDEKTvgEPGWLYGSFQGNFGWFPCNYVE 56

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 42.69 E-value: 3.27e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGWLYGSFQGK---FGWFPCNY 800
Cdd:cd11821     3 RALYDCQADNDDELTFSEGEIIVVTGE--EDDEWWEGHIEGDpsrRGVFPVSF 53

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 48.81 E-value: 3.30e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   345 LPSYQKTQEEEPQ--KKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQle 422
Cdd:TIGR00618  276 EAVLEETQERINRarKAAPLAAHIKAVTQIEQQAQRIHTELQSKMRSRAKLLMKRAAHVKQQSSIEEQRRLLQTLHSQ-- 353

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   423 lEKRLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNG- 501
Cdd:TIGR00618  354 -EIHIRDAHEVATSIREISCQQHTLTQHIHTLQQQKTTLTQKLQSLCKELDILQREQATIDTRTSAFRDLQGQLAHAKKq 432

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   502 -KHQQISGRLQDVQIRKQTQ-----KTELEVLDKQCDLEIMEIKQLQQELKEYQNKliylvpeKQLLNERIKNMQLSNTP 575
Cdd:TIGR00618  433 qELQQRYAELCAAAITCTAQcekleKIHLQESAQSLKEREQQLQTKEQIHLQETRK-------KAVVLARLLELQEEPCP 505

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   576 DSGiSLLHKK--------SSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLkcgsmddcvlQCLLSLLSCLNNLFLL 647
Cdd:TIGR00618  506 LCG-SCIHPNparqdidnPGPLTRRMQRGEQTYAQLETSEEDVYHQLTSERKQR----------ASLKEQMQEIQQSFSI 574

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   648 LKELRESY-----NTQQLALEQLHKIkrDKLKEIERKRLE--QIQKKKLEDEAAR-------KAKQGKENLWRESIRKEE 713
Cdd:TIGR00618  575 LTQCDNRSkedipNLQNITVRLQDLT--EKLSEAEDMLACeqHALLRKLQPEQDLqdvrlhlQQCSQELALKLTALHALQ 652

                          410       420       430       440
                   ....*....|....*....|....*....|....*....|..
gi 312176401   714 EEKQKRLQEEKSQDKTQEEERKAEAKQSETASALVNYRALYP 755
Cdd:TIGR00618  653 LTLTQERVREHALSIRVLPKELLASRQLALQKMQSEKEQLTY 694

First Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212707 [Multi-domain] Cd Length: 57 Bit Score: 42.80 E-value: 3.36e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWW-------TGSIGERTGIFPSNY 1021
Cdd:cd11773     2 YKALYDYEPQTEDELTIQEDDILYLLEKsDDDWWkvklkvnSSDDDEPVGLVPATY 57

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 42.73 E-value: 3.37e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEktVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11796     3 RVLQDLSAQLDEELDLREGDVVTITG--ILDKGWFRGELNGRRGIFPEGFV 51

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 43.12 E-value: 3.37e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGWLYG-SFQGKFGWFPCNYVEK 803
Cdd:cd11761     6 VLYSYEAQRPDELTITEGEELEVIEDGDGD-GWVKArNKSGEVGYVPENYLQF 57

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor; ASEF, also called ARHGEF4, exists in an autoinhibited form and is activated upon binding of the tumor suppressor APC (adenomatous polyposis coli). GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF can activate Rac1 or Cdc42. Truncated ASEF, which is found in colorectal cancers, is constitutively active and has been shown to promote angiogenesis and cancer cell migration. ASEF contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. In its autoinhibited form, the SH3 domain of ASEF forms an extensive interface with the DH and PH domains, blocking the Rac binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212906 [Multi-domain] Cd Length: 73 Bit Score: 43.47 E-value: 3.38e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11973    22 ALWDHVTMDDQELGFKAGDVIEVMDATNKEWWWGRVLDSEGWFPASFVRL 71

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the third SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212714 [Multi-domain] Cd Length: 55 Bit Score: 43.06 E-value: 3.44e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGSiGERT---GIFPSNYVRP 1024
Cdd:cd11780     2 YRALYSYTPQNEDELELREGDIVYVMEKcdDG-WFVGT-SERTglfGTFPGNYVAR 55

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 42.69 E-value: 3.47e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  749 NYRALYPFEARNHDEMSFSSGDIIQVdeKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11982     2 TFMAVKPYQSQAEGEISLSKGEKIKV--LSVGEGGFWEGQVKGRVGWFPSDCV 52

Src Homology 3 domain of Interleukin-2-inducible T-cell Kinase; ITK (also known as Tsk or Emt) is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain, which contains proline-rich and zinc-binding regions. ITK is expressed in T-cells and mast cells, and is important in their development and differentiation. Of the three Tec kinases expressed in T-cells, ITK plays the predominant role in T-cell receptor (TCR) signaling. It is activated by phosphorylation upon TCR crosslinking and is involved in the pathway resulting in phospholipase C-gamma1 activation and actin polymerization. It also plays a role in the downstream signaling of the T-cell costimulatory receptor CD28, the T-cell surface receptor CD2, and the chemokine receptor CXCR4. In addition, ITK is crucial for the development of T-helper(Th)2 effector responses. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212841 [Multi-domain] Cd Length: 56 Bit Score: 43.08 E-value: 3.48e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQ-GETNGLTGLFPSNYV 1169
Cdd:cd11908     3 VIALYDYQTNDPQELALRYNEEYHLLDSSEIHWWRvQDKNGHEGYVPSSYL 53

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 42.71 E-value: 3.60e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1048 VTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHVK 1101
Cdd:cd12076     5 VIYPYTARDQDEINLEKGAVVEVIQKNLEGWWKIRYQG-----KEGWAPASYLK 53

Src Homology 3 domain of Myosin XV; This subfamily is composed of proteins with similarity to Myosin XVa. Myosin XVa is an unconventional myosin that is critical for the normal growth of mechanosensory stereocilia of inner ear hair cells. Mutations in the myosin XVa gene are associated with nonsyndromic hearing loss. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212817 [Multi-domain] Cd Length: 56 Bit Score: 42.70 E-value: 3.69e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE----WWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11884     3 VAVRAYITRDQTLLSFHKGDVIKLLPKEGPldpgWLFGTLDGRSGAFPKEYVQP 56

C2 domain second repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 175978 [Multi-domain] Cd Length: 111 Bit Score: 44.49 E-value: 3.84e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1561 VHVIEATELkackPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWN----FNCQFFIKDLYQDVLCLTMFDRDQFSPDDFL 1636
Cdd:cd04011     8 VRVIEARQL----VGGNIDPVVKVEVGGQKKYTSVKKGTNCPFYNeyffFNFHESPDELFDKIIKISVYDSRSLRSDTLI 83

                          90
                  ....*....|....*
gi 312176401 1637 GRTEVPVAKIRTEQE 1651
Cdd:cd04011    84 GSFKLDVGTVYDQPD 98

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 43.11 E-value: 3.95e-05

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|.
gi 312176401  881 NLKAQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGWFPKSYVKLIPG 937
Cdd:cd12001     2 NVLAKALYDNVAESPDELSFRKGDIMTVLERDtqglDGWWLCSLHGRQGIVPGNRLKILVG 62

Fifth Src homology 3 domain (or SH3E) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212928 [Multi-domain] Cd Length: 54 Bit Score: 42.63 E-value: 4.07e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHVKL 1102
Cdd:cd11995     9 YTAQNDDELAFSKGQIINVLNKEDPDWWKGELNG-----QVGLFPSNYVKL 54

C2 domain second repeat in Munc13 (mammalian uncoordinated) proteins; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 175993 [Multi-domain] Cd Length: 127 Bit Score: 44.87 E-value: 4.16e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1558 RLMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDlYQDVLCLTMFDRD--------- 1628
Cdd:cd04027     2 KISITVVCAQGLIAKDKTGTSDPYVTVQVGKTKKRTKTIPQNLNPVWNEKFHFECHN-SSDRIKVRVWDEDddiksrlkq 80

                          90       100
                  ....*....|....*....|....*
gi 312176401 1629 QFS--PDDFLGRTEVPVAKIRTEQE 1651
Cdd:cd04027    81 KFTreSDDFLGQTIIEVRTLSGEMD 105

Second Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212834 [Multi-domain] Cd Length: 55 Bit Score: 42.71 E-value: 4.19e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401  978 YSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGSIGERTGIFPSNYV 1022
Cdd:cd11901     8 FNYTAEREDELSLVKGTKVIVMEKcsDG-WWRGSYNGQVGWFPSNYV 53

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 42.49 E-value: 4.26e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11833     2 YVALYKFKPQENEDLEMRPGDKITLLDDSNED--WWKGKIEDRVGFFPANFVQR 53

Atrophin-1 family; Atrophin-1 is the protein product of the dentatorubral-pallidoluysian atrophy (DRPLA) gene. DRPLA OMIM:125370 is a progressive neurodegenerative disorder. It is caused by the expansion of a CAG repeat in the DRPLA gene on chromosome 12p. This results in an extended polyglutamine region in atrophin-1, that is thought to confer toxicity to the protein, possibly through altering its interactions with other proteins. The expansion of a CAG repeat is also the underlying defect in six other neurodegenerative disorders, including Huntington's disease. One interaction of expanded polyglutamine repeats that is thought to be pathogenic is that with the short glutamine repeat in the transcriptional coactivator CREB binding protein, CBP. This interaction draws CBP away from its usual nuclear location to the expanded polyglutamine repeat protein aggregates that are characteriztic of the polyglutamine neurodegenerative disorders. This interferes with CBP-mediated transcription and causes cytotoxicity.

Pssm-ID: 460830 [Multi-domain] Cd Length: 991 Bit Score: 48.61 E-value: 4.28e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401    86 IKLKLQGQQLPVvlPPImkQPPMFSPLISARFGMGSMPNLSIHQPLPPVAPIAtPLSSATSGtsiPPLMMPAPLVPSVST 165
Cdd:pfam03154  415 LQLMPQSQQLPP--PPA--QPPVLTQSQSLPPPAASHPPTSGLHQVPSQSPFP-QHPFVPGG---PPPITPPSGPPTSTS 486

                           90       100       110
                   ....*....|....*....|....*....|..
gi 312176401   166 SSLPngtaSLIQPLSIPYSSS-TLPHASSYSL 196
Cdd:pfam03154  487 SAMP----GIQPPSSASVSSSgPVPAAVSCPL 514

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 42.71 E-value: 4.38e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1119 QVIAMYDYMANNEDE---LNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11787     1 QCKALYDFEMKDEDEkdcLTFKKGDVITVIRRVDENWAEGRLGDKIGIFPISF 53

First Src homology 3 domain (or SH3A) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The first SH3 domain (or SH3A) of ITSN1 has been shown to bind many proteins including Sos1, dynamin1/2, CIN85, c-Cbl, PI3K-C2, SHIP2, N-WASP, and CdGAP, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212920 [Multi-domain] Cd Length: 55 Bit Score: 42.68 E-value: 4.42e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11987     4 ALYPFEARSHDEITIQPGDIVMVDESQtgEPGWLGGELKGKTGWFPANYAE 54

Src Homology 3 domain of TXK, also called Resting lymphocyte kinase (Rlk); TXK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal cysteine-rich region. Rlk is expressed in T-cells and mast cell lines, and is a key component of T-cell receptor (TCR) signaling. It is important in TCR-stimulated proliferation, IL-2 production and phospholipase C-gamma1 activation. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212840 [Multi-domain] Cd Length: 55 Bit Score: 42.63 E-value: 4.70e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGS--IGERtGIFPSNYV 1022
Cdd:cd11907     4 KALYDFLPREPSNLALKRAEEYLILEQyDPHWWKARdrYGNE-GLIPSNYV 53

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing protein B; UBASH3B, also called Suppressor of T cell receptor Signaling (STS)-1 or T cell Ubiquitin LigAnd (TULA)-2 is an active phosphatase that is expressed ubiquitously. The phosphatase activity of UBASH3B is essential for its roles in the suppression of TCR signaling and the regulation of EGFR. It also interacts with Syk and functions as a negative regulator of platelet glycoprotein VI signaling. TULA proteins contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212869 Cd Length: 62 Bit Score: 42.72 E-value: 4.77e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVD--EKTVGEPGWLYGSF--QGKFGWFPCNYVEK 803
Cdd:cd11936     5 QVIYPYTPQNDDELELVPGDYIFMSpmEQTSTSEGWIYGTSltTGCSGLLPENYITK 61

Third Src Homology 3 domain (SH3C) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CIN85. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212990 [Multi-domain] Cd Length: 56 Bit Score: 42.58 E-value: 4.82e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401 1047 QVTSAYAASGTEQLSLAPGQLILILKKNT--SGWWQGELQARgkkrqKGWFPASHVKLL 1103
Cdd:cd12057     3 KVLFPYEAQNEDELTIKEGDIVTLISKDCidAGWWEGELNGR-----RGVFPDNFVKLL 56

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 42.34 E-value: 4.85e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWF-GEVHGGRGWFPKSYV 932
Cdd:cd11796     1 QARVLQDLSAQLDEELDLREGDVVTITGILDKGWFrGELNGRRGIFPEGFV 51

Src homology 3 domain of Signal Transducing Adaptor Molecule 2; STAM2, also called EAST (Epidermal growth factor receptor-associated protein with SH3 and TAM domain) or Hbp (Hrs binding protein), is part of the endosomal sorting complex required for transport (ESCRT-0). It plays a role in sorting mono-ubiquinated endosomal cargo for trafficking to the lysosome for degradation. It is also involved in the regulation of exocytosis. STAMs were discovered as proteins that are highly phosphorylated following cytokine and growth factor stimulation. They function in cytokine signaling and surface receptor degradation, as well as regulate Golgi morphology. They associate with many proteins including Jak2 and Jak3 tyrosine kinases, Hrs, AMSH, and UBPY. STAM adaptor proteins contain VHS (Vps27, Hrs, STAM homology), ubiquitin interacting (UIM), and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212896 [Multi-domain] Cd Length: 57 Bit Score: 42.70 E-value: 5.02e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11963     5 RALYDFEAVEDNELTFKHGEIIIVLDDS--DANWWKGENHRGVGLFPSNFV 53

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 3 (PACSIN3); PACSIN 3 or Syndapin III (Synaptic dynamin-associated protein III) is expressed ubiquitously and regulates glucose uptake in adipocytes through its role in GLUT1 trafficking. It also modulates the subcellular localization and stimulus-specific function of the cation channel TRPV4. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212930 [Multi-domain] Cd Length: 56 Bit Score: 42.64 E-value: 5.14e-05

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                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTGSIGE-RTGIFPSNYV 1022
Cdd:cd11997     6 ALYDYTGQEADELSFKAGEELLKIGEEDEqgWCKGRLLSgRIGLYPANYV 55

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 42.25 E-value: 5.21e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401  890 WTAKKENHLNFSKHDVIT-VLEQQENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11873     8 YDAEEPDELTLKVGDIITnVKKMEEGWWEGTLNGKRGMFPDNFVK 52

Src Homology 3 domain of Abelson helper integration site-1 (AHI-1); AHI-1, also called Jouberin, is expressed in high levels in the brain, gonad tissues, and skeletal muscle. It is an adaptor protein that interacts with the small GTPase Rab8a and regulates it distribution and function, affecting cilium formation and vesicle transport. Mutations in the AHI-1 gene can cause Joubert syndrome, a disorder characterized by brainstem malformations, cerebellar aplasia/hypoplasia, and retinal dystrophy. AHI-1 variation is also associated with susceptibility to schizophrenia and type 2 diabetes mellitus progression. AHI-1 contains WD40 and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212746 [Multi-domain] Cd Length: 52 Bit Score: 42.11 E-value: 5.43e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELqARGkkrQKGWFPASHV 1100
Cdd:cd11812     8 YTANRSDELTIHRGDIIRVLYKDNDNWWFGSL-VNG---QQGYFPANYV 52

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 42.31 E-value: 5.58e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQ--ENWWFGE-VHGGRGWFPKSYV 932
Cdd:cd11763     1 KVRALYDFDSQPSGELSLRAGEVLTITRQDvgDGWLEGRnSRGEVGLFPSSYV 53

Src homology 3 domain of Myosins Ie, If, and similar proteins; Myosins Ie (MyoIe) and If (MyoIf) are nonmuscle, unconventional, long tailed, class I myosins containing an N-terminal motor domain and a myosin tail with TH1, TH2, and SH3 domains. MyoIe interacts with the endocytic proteins, dynamin and synaptojanin-1, through its SH3 domain; it may play a role in clathrin-dependent endocytosis. In the kidney, MyoIe is critical for podocyte function and normal glomerular filtration. Mutations in MyoIe is associated with focal segmental glomerulosclerosis, a disease characterized by massive proteinuria and progression to end-stage kidney disease. MyoIf is predominantly expressed in the immune system; it plays a role in immune cell motility and innate immunity. Mutations in MyoIf may be associated with the loss of hearing. The MyoIf gene has also been found to be fused to the MLL (Mixed lineage leukemia) gene in infant acute myeloid leukemias (AML). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212761 [Multi-domain] Cd Length: 53 Bit Score: 42.02 E-value: 5.90e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11827     1 QCKALYAYDAQDTDELSFNEGDIIEILkEDPSGWWTGRLRGKEGLFPGNYV 51

Src homology 3 domain of Yes Protein Tyrosine Kinase; Yes (or c-Yes) is a member of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. c-Yes kinase is the cellular homolog of the oncogenic protein (v-Yes) encoded by the Yamaguchi 73 and Esh sarcoma viruses. It displays functional overlap with other Src subfamily members, particularly Src. It also shows some unique functions such as binding to occludins, transmembrane proteins that regulate extracellular interactions in tight junctions. Yes also associates with a number of proteins in different cell types that Src does not interact with, like JAK2 and gp130 in pre-adipocytes, and Pyk2 in treated pulmonary vein endothelial cells. Although the biological function of Yes remains unclear, it appears to have a role in regulating cell-cell interactions and vesicle trafficking in polarized cells. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212940 [Multi-domain] Cd Length: 58 Bit Score: 42.33 E-value: 5.90e-05

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                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGWLYGSFQ-GKFGWFPCNYV 801
Cdd:cd12007     3 FVALYDYEARTTEDLSFKKGERFQIINNTEGD-WWEARSIAtGKNGYIPSNYV 54

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 42.32 E-value: 5.94e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEKVL 805
Cdd:cd11971     4 AIYDYSKDKDDELSFMEGAIIYVIKKN--DDGWYEGVCNGVTGLFPGNYVESIM 55

Src homology 3 domain of Abl Interactor 1; Abi1, also called e3B1, is a central regulator of actin cytoskeletal reorganization through interactions with many protein complexes. It is part of WAVE, a nucleation-promoting factor complex, that links Rac 1 activation to actin polymerization causing lamellipodia protrusion at the plasma membrane. Abi1 interact with formins to promote protrusions at the leading edge of motile cells. It also is a target of alpha4 integrin, regulating membrane protrusions at sites of integrin engagement. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212904 [Multi-domain] Cd Length: 59 Bit Score: 42.32 E-value: 6.00e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11971     3 VAIYDYSKDKDDELSFMEGAIIYVIKKnDDGWYEGVCNGVTGLFPGNYV 51

Src homology 3 domain of an unknown subfamily of proteins with similarity to Protein kinase C and Casein kinase Substrate in Neurons (PACSIN) proteins; PACSINs, also called Synaptic dynamin-associated proteins (Syndapins), act as regulators of cytoskeletal and membrane dynamics. They bind both dynamin and Wiskott-Aldrich syndrome protein (WASP), and may provide direct links between the actin cytoskeletal machinery through WASP and dynamin-dependent endocytosis. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212932 [Multi-domain] Cd Length: 56 Bit Score: 42.23 E-value: 6.11e-05

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                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGE--RTGIFPSNYV 1022
Cdd:cd11999     6 AVYDYTGQEPDELSFKAGEELLkVEDEDEQGWCKGVTDggAVGLYPANYV 55

Third (or C-terminal) Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212851 [Multi-domain] Cd Length: 58 Bit Score: 42.25 E-value: 6.17e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  971 GEDYIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGsIGERT---GIFPSNYVRP 1024
Cdd:cd11918     1 RTPYKAVYQYRPQNEDELELREGDRVDVMQQcDDGWFVG-VSRRTqkfGTFPGNYVAP 57

Second Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the second SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212716 [Multi-domain] Cd Length: 53 Bit Score: 41.95 E-value: 6.17e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11782     3 RAKYNFNADTGVELSFRKGDVItltrRVDEN------WYEGRIGGRQGIFPVSYVQ 52

MAEBL; Provisional

Pssm-ID: 173412 [Multi-domain] Cd Length: 2084 Bit Score: 48.21 E-value: 6.18e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  337 QVDSVNGTLPSY--------QKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAE--RKAQK-EKEEW 405
Cdd:PTZ00121 1065 HVGQDEGLKPSYkdfdfdakEDNRADEATEEAFGKAEEAKKTETGKAEEARKAEEAKKKAEDARKAEeaRKAEDaRKAEE 1144

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  406 ERKQRELQEQEWKKQLELEKRLEKQRELERQREEERRKEIERREAAKQ--------ELERQRRLEWERLRRQELLSQKTR 477
Cdd:PTZ00121 1145 ARKAEDAKRVEIARKAEDARKAEEARKAEDAKKAEAARKAEEVRKAEElrkaedarKAEAARKAEEERKAEEARKAEDAK 1224

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  478 EQEDIVRLSSRKK----SLHLELEAVNGKHQQISGRLQDVQIRKQTQkTELEVLDKQCDLEIMEIKQLQQELKEYQnkli 553
Cdd:PTZ00121 1225 KAEAVKKAEEAKKdaeeAKKAEEERNNEEIRKFEEARMAHFARRQAA-IKAEEARKADELKKAEEKKKADEAKKAE---- 1299

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  554 ylvpEKQLLNERIKNMQLSNTPDSgislLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLKCGSMDDCVLQC 633
Cdd:PTZ00121 1300 ----EKKKADEAKKKAEEAKKADE----AKKKAEEAKKKADAAKKKAEEAKKAAEAAKAEAEAAADEAEAAEEKAEAAEK 1371

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  634 LLSLLSCLNNLF-LLLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLE----DEAARKAKQGKENlwRES 708
Cdd:PTZ00121 1372 KKEEAKKKADAAkKKAEEKKKADEAKKKAEEDKKKADELKKAAAAKKKADEAKKKAEEkkkaDEAKKKAEEAKKA--DEA 1449

                         410       420       430
                  ....*....|....*....|....*....|....*....
gi 312176401  709 IRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSETASAL 747
Cdd:PTZ00121 1450 KKKAEEAKKAEEAKKKAEEAKKADEAKKKAEEAKKADEA 1488

Src homology 3 domain of Cortactin; Cortactin was originally identified as a substrate of Src kinase. It is an actin regulatory protein that binds to the Arp2/3 complex and stabilizes branched actin filaments. It is involved in cellular processes that affect cell motility, adhesion, migration, endocytosis, and invasion. It is expressed ubiquitously except in hematopoietic cells, where the homolog hematopoietic lineage cell-specific 1 (HS1) is expressed instead. Cortactin contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region interacts with the Arp2/3 complex and F-actin, and is crucial in regulating branched actin assembly. Cortactin also serves as a scaffold and provides a bridge to the actin cytoskeleton for membrane trafficking and signaling proteins that bind to its SH3 domain. Binding partners for the SH3 domain of cortactin include dynamin2, N-WASp, MIM, FGD1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212892 [Multi-domain] Cd Length: 53 Bit Score: 42.02 E-value: 6.18e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11959     3 VALYDYQAADDDEISFDPDDIITnIEMIDEGWWRGVCRGKYGLFPANYV 51

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 42.39 E-value: 6.28e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11975     9 AVWDHVTMANRELAFKAGDVIKVLDASNKDWWWGQIDDEEGWFPASFVRL 58

Arginine and glutamate-rich 1; ARGLU, arginine and glutamate-rich 1 protein family, is required for the oestrogen-dependent expression of ESR1 target genes. It functions in cooperation with MED1. The family of proteins is found in eukaryotes.

Pssm-ID: 405931 [Multi-domain] Cd Length: 151 Bit Score: 45.04 E-value: 6.33e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   663 EQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWR-------ESIRKEEEEKQKRLQEEKSQDktqEEERK 735
Cdd:pfam15346   45 EARKIMEKQVLEELEREREAELEEERRKEEEERKKREELERILEennrkieEAQRKEAEERLAMLEEQRRMK---EERQR 121


                   ....*..
gi 312176401   736 AEAKQSE 742
Cdd:pfam15346  122 REKEEEE 128

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 42.17 E-value: 6.41e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPD---WWQGETNGLTGLFPSN 1167
Cdd:cd12000     5 ALYDNKADCSDELAFRRGDILTVLEQNVPGsegWWKCLLHGRQGLAPAN 53

helix-rich Mycoplasma protein; Members of this family occur strictly within a subset of Mycoplasma species. Members average 750 amino acids in length, including signal peptide. Sequences are predicted (Jpred 3) to be almost entirely alpha-helical. These sequences show strong periodicity (consistent with long alpha helical structures) and low complexity rich in D,E,N,Q, and K. Genes encoding these proteins are often found in tandem. The function is unknown.

Pssm-ID: 275316 [Multi-domain] Cd Length: 745 Bit Score: 47.71 E-value: 6.42e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   378 ELEKRRQVLMEQQQREAERKAQKEKE---------EWERKQRELQEQEWKKQLELE------KRLEKQRelerqreeerr 442
Cdd:TIGR04523  222 ELKKQNNQLKDNIEKKQQEINEKTTEisntqtqlnQLKDEQNKIKKQLSEKQKELEqnnkkiKELEKQL----------- 290

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   443 keierreaakQELERQrrlewerlrRQELLSQKtreQEDIVrlssrkKSLHLELEAVNGKHQQIsgrlqDVQIRKQTQ-- 520
Cdd:TIGR04523  291 ----------NQLKSE---------ISDLNNQK---EQDWN------KELKSELKNQEKKLEEI-----QNQISQNNKii 337

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   521 ---KTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLS-NTPDSGISLLHKKSSEKEELCQRL 596
Cdd:TIGR04523  338 sqlNEQISQLKKELTNSESENSEKQRELEEKQNEIEKLKKENQSYKQEIKNLESQiNDLESKIQNQEKLNQQKDEQIKKL 417

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   597 KEQLDALEKETASKLSEMDSFNNQLKCGSMDDCVLQCLLSLLSCLNNLF-LLLKELRESYNTQQLALEQLHKIKRDKLKE 675
Cdd:TIGR04523  418 QQEKELLEKEIERLKETIIKNNSEIKDLTNQDSVKELIIKNLDNTRESLeTQLKVLSRSINKIKQNLEQKQKELKSKEKE 497

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   676 I-----ERKRLEQIQK-------------KKLEDEAARKAKQGKE----------NLWRESIRKEEEEKQKRLQE----- 722
Cdd:TIGR04523  498 LkklneEKKELEEKVKdltkkisslkekiEKLESEKKEKESKISDledelnkddfELKKENLEKEIDEKNKEIEElkqtq 577

                          410       420       430
                   ....*....|....*....|....*....|.
gi 312176401   723 ---EKSQDKTQEEERKAEAKQSETASALVNY 750
Cdd:TIGR04523  578 kslKKKQEEKQELIDQKEKEKKDLIKEIEEK 608

Second Src homology 3 domain (or SH3B) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The second SH3 domain (or SH3B) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212923 [Multi-domain] Cd Length: 52 Bit Score: 41.95 E-value: 6.57e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKtvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11990     3 QALCSWTAKKDNHLNFSKNDIITVLEQ---QENWWFGEVHGGRGWFPKSYVK 51

Fifth Src homology 3 domain (or SH3E) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fifth SH3 domain (or SH3E) of ITSN1 has been shown to bind many protein partners including SGIP1, Sos1, dynamin1/2, CIN85, c-Cbl, SHIP2, N-WASP, and synaptojanin-1, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212774 [Multi-domain] Cd Length: 53 Bit Score: 42.02 E-value: 6.57e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHVKL 1102
Cdd:cd11840     8 YTAQNEDELSFQKGDIINVLSKDDPDWWRGELNG-----QTGLFPSNYVEP 53

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 1, also called Insulin Receptor Tyrosine Kinase Substrate (IRTKS); BAIAP2L1 or IRTKS is widely expressed, serves as a substrate for the insulin receptor, and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. BAIAP2L1 expression leads to the formation of short actin bundles, distinct from filopodia-like protrusions induced by the expression of the related protein IRSp53. IRTKS mediates the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRTKS has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212846 Cd Length: 58 Bit Score: 42.21 E-value: 6.74e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....
gi 312176401  895 ENHLNFSKHDVITVL--EQQENWWFGE--VHGGRGWFPKSYVKL 934
Cdd:cd11913    15 KTLLSFAQGDVITLLipEEKDGWLYGEhdTTKARGWFPSSYTRP 58

C2 domain present in Phosphatidylserine decarboxylase (PSD); PSD is involved in the biosynthesis of aminophospholipid by converting phosphatidylserine (PtdSer) to phosphatidylethanolamine (PtdEtn). There is a single C2 domain present and it is thought to confer PtdSer binding motif that is common to PKC and synaptotagmin. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176004 [Multi-domain] Cd Length: 108 Bit Score: 43.78 E-value: 6.77e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSN----PYCEVSMGSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDV-LCLTMFDRDQFS 1631
Cdd:cd04039     1 GVVFMEIKSITDLPPLKNMTRTGfdmdPFVIISFGRRVFRTSWRRHTLNPVFNERLAFEVYPHEKNFdIQFKVLDKDKFS 80

                          90       100
                  ....*....|....*....|....*.
gi 312176401 1632 PDDFLGRTEVPVAKIRTEQESKGPTT 1657
Cdd:cd04039    81 FNDYVATGSLSVQELLNAAPQPDPET 106

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 42.19 E-value: 6.83e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd12052     2 AIVEFDYKAQHEDELTITVGDIITKIKKDDGGWWEGEIKGR-----RGLFPDNFVR 52

Src homology 3 domain of Phospholipase C (PLC) gamma; PLC catalyzes the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG) in response to various receptors. Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma catalyzes this reaction in tyrosine kinase-dependent signaling pathways. It is activated and recruited to its substrate at the membrane. Vertebrates contain two forms of PLCgamma, PLCgamma1, which is widely expressed, and PLCgamma2, which is primarily found in haematopoietic cells. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212759 [Multi-domain] Cd Length: 54 Bit Score: 41.93 E-value: 6.93e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELqarGKKRQKgWFPASHVK 1101
Cdd:cd11825     8 YRAQRPDELSFCKHAIITNVEKEDGGWWRGDY---GGKKQK-WFPANYVE 53

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 42.28 E-value: 6.95e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRG-WFPKSYVKLI 935
Cdd:cd11970     7 KALFDYKAQREDELTFTKNAIIQNVEKQEgGWWRGDYGGKKQlWFPSNYVEEI 59

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 47.66 E-value: 7.03e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   347 SYQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKR 426
Cdd:pfam02463  289 KLLAKEEEELKSELLKLERRKVDDEEKLKESEKEKKKAEKELKKEKEEIEELEKELKELEIKREAEEEEEEELEKLQEKL 368

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   427 LEKQRELERQREEERRKEIERREAAKQELERQrrleweRLRRQELLSQKTREQEDIVRLSSRKKSLhLELEAVNGKhqqi 506
Cdd:pfam02463  369 EQLEEELLAKKKLESERLSSAAKLKEEELELK------SEEEKEAQLLLELARQLEDLLKEEKKEE-LEILEEEEE---- 437

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   507 sgRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLvpEKQLLNERIKNMQLSNTpdsgiSLLHKKS 586
Cdd:pfam02463  438 --SIELKQGKLTEEKEELEKQELKLLKDELELKKSEDLLKETQLVKLQE--QLELLLSRQKLEERSQK-----ESKARSG 508

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   587 SEKEELCQRLKEQLD----ALEKETASKLSEMDSFNNQLKCGSMDDCVLQCLLSLLSCLNNLFLLLKELResYNTQQLAL 662
Cdd:pfam02463  509 LKVLLALIKDGVGGRiisaHGRLGDLGVAVENYKVAISTAVIVEVSATADEVEERQKLVRALTELPLGAR--KLRLLIPK 586

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   663 EQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSE 742
Cdd:pfam02463  587 LKLPLKSIAVLEIDPILNLAQLDKATLEADEDDKRAKVVEGILKDTELTKLKESAKAKESGLRKGVSLEEGLAEKSEVKA 666


                   ....*
gi 312176401   743 TASAL 747
Cdd:pfam02463  667 SLSEL 671

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 42.00 E-value: 7.09e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTG-SIGERTGIFPSNYV 1022
Cdd:cd11960     4 ALYDYQAADDTEISFDPGDIITdIEQIDEGWWRGtGPDGTYGLFPANYV 52

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 41.91 E-value: 7.20e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401  889 SWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11902     8 AYVAEREDELSLVKGSRVTVMEKcSDGWWRGSYNGQIGWFPSNYV 52

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 41.99 E-value: 7.34e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT--GLFPSNYVK 1170
Cdd:cd11858     4 ALYDFAGSVANELSLKKDDIVYIVQKEDNGWWLAKKLDESkeGWVPAAYLE 54

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 42.18 E-value: 7.46e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPD---WWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12003     5 ALYDNAAESPEELSFRRGDVLMVLKREHGSlpgWWLCSLHGQQGIAPANRLRL 57

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Neural precursor cell Expressed, Developmentally Down-regulated 9; NEDD9 is also called human enhancer of filamentation 1 (HEF1) or CAS-L (Crk-associated substrate in lymphocyte). It was first described as a gene predominantly expressed in early embryonic brain, and was also isolated from a screen of human proteins that regulate filamentous budding in yeast, and as a tyrosine phosphorylated protein in lymphocytes. It promotes metastasis in different solid tumors. NEDD9 localizes in focal adhesions and associates with FAK and Abl kinase. It also interacts with SMAD3 and the proteasomal machinery which allows its rapid turnover; these interactions are not shared by other CAS proteins. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212935 Cd Length: 57 Bit Score: 41.89 E-value: 7.61e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:cd12002     2 ARALYDNVPECAEELAFRKGDILTVIEQNtgglEGWWLCSLHGRQGIAPGNRLKLL 57

Src Homology 3 domain of Sdc25/Cdc25 guanine nucleotide exchange factors; This subfamily is composed of the Saccharomyces cerevisiae guanine nucleotide exchange factors (GEFs) Sdc25 and Cdc25, and similar proteins. These GEFs regulate Ras by stimulating the GDP/GTP exchange on Ras. Cdc25 is involved in the Ras/PKA pathway that plays an important role in the regulation of metabolism, stress responses, and proliferation, depending on available nutrients and conditions. Proteins in this subfamily contain an N-terminal SH3 domain as well as REM (Ras exchanger motif) and RasGEF domains at the C-terminus. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212816 Cd Length: 55 Bit Score: 41.88 E-value: 7.66e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKD--GeWWTGSIGERTGI-----FPSNY 1021
Cdd:cd11883     3 VALYDFTPKSKNQLSFKAGDIIYVLNKDpsG-WWDGVIISSSGKvkrgwFPSNY 55

Src homology 3 domain of Src-Like Adaptor Protein 2; SLAP2 plays a role in c-Cbl-dependent regulation of CSF1R, a tyrosine kinase important for myeloid cell growth and differentiation. It has been shown to interact with CSF1R, c-Cbl, LAT, CD247, and Zap70. SLAPs are adaptor proteins with limited similarity to Src family tyrosine kinases. They contain an N-terminal SH3 domain followed by an SH2 domain, and a unique C-terminal sequence. They function in regulating the signaling, ubiquitination, and trafficking of T-cell receptor (TCR) and B-cell receptor (BCR) components. The SH3 domain of SLAP forms a complex with v-Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212944 Cd Length: 55 Bit Score: 42.04 E-value: 7.90e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGEWWT--GSIGERTGIFPSNYV 1022
Cdd:cd12011     3 VALCNFPSGGPTELSIRMGEQLTILSEDGDWWKvsSAVTGRECYIPSNYV 52

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 41.84 E-value: 8.10e-05

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNY 800
Cdd:cd11952     5 ALWDYSAEFPDELSFKEGDMVTVLRKDGEGTDWWWASLCGREGYVPRNY 53

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 44.65 E-value: 8.15e-05

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   669 KRDKLKEIERKRLEQIQKK------KLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSE 742
Cdd:pfam05672   33 ERLEKEEEERLRKEELRRRaeeeraRREEEARRLEEERRREEEERQRKAEEEAEEREQREQEEQERLQKQKEEAEAKARE 112


                   ..
gi 312176401   743 TA 744
Cdd:pfam05672  113 EA 114

First Src Homology 3 domain of Nck adaptor proteins; Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4), which show partly overlapping functions but also bind distinct targets. Their SH3 domains are involved in recruiting downstream effector molecules, such as the N-WASP/Arp2/3 complex, which when activated induces actin polymerization that results in the production of pedestals, or protrusions of the plasma membrane. The first SH3 domain of Nck proteins preferentially binds the PxxDY sequence, which is present in the CD3e cytoplasmic tail. This binding inhibits phosphorylation by Src kinases, resulting in the downregulation of TCR surface expression. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212699 [Multi-domain] Cd Length: 51 Bit Score: 41.63 E-value: 8.62e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNkDDPDWWQGE-TNGLTGLFPSNYV 1169
Cdd:cd11765     2 VVAKYDYTAQGDQELSIKKNEKLTLLD-DSKHWWKVQnSSNQTGYVPSNYV 51

Uncharacterized N-terminal coiled-coil domain of peptidoglycan hydrolase CwlO [Function unknown];

Pssm-ID: 443091 [Multi-domain] Cd Length: 379 Bit Score: 46.75 E-value: 8.65e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  473 SQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKqcdleimEIKQLQQELKEYQNKL 552
Cdd:COG3883    16 PQIQAKQKELSELQAELEAAQAELDALQAELEELNEEYNELQAELEALQAEIDKLQA-------EIAEAEAEIEERREEL 88

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  553 iylvpekqllNERIKNMQLSNTPDSGISLLhKKSSEKEELCQRLkeqlDALEKETASKLSEMDSFNNQLKcgsmddcvlq 632
Cdd:COG3883    89 ----------GERARALYRSGGSVSYLDVL-LGSESFSDFLDRL----SALSKIADADADLLEELKADKA---------- 143

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  633 cllsllsclnnlflLLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKE 712
Cdd:COG3883   144 --------------ELEAKKAELEAKLAELEALKAELEAAKAELEAQQAEQEALLAQLSAEEAAAEAQLAELEAELAAAE 209

                         250       260       270       280       290
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  713 EEEKQKRLQEEKSQDKTQEEERKAEAKQSETASALVNYRALYPFEARNHDEMSFSSG 769
Cdd:COG3883   210 AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAASAAGAGAAGAAGAAAGSAGAAG 266

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 41.58 E-value: 8.73e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd11758     4 RALFDFPGNDDEDLPFKKGEILTVIRKP-EEQWWNARNSEGKTGMIPVPYVEK 55

C2 domain in Munc13 (mammalian uncoordinated) proteins; fungal group; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-II topology.

Pssm-ID: 176008 [Multi-domain] Cd Length: 126 Bit Score: 43.79 E-value: 8.98e-05

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1561 VHVIEATELKACKPNGKSNPYceVSM-----GSQSYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDF 1635
Cdd:cd04043     5 IRIVRAENLKADSSNGLSDPY--VTLvdtngKRRIAKTRTIYDTLNPRWDEEFELEVPAGEPLWISATVWDRSFVGKHDL 82


                  ....
gi 312176401 1636 LGRT 1639
Cdd:cd04043    83 CGRA 86

Src Homology 3 domain of Membrane Protein, Palmitoylated 3 (or MAGUK p55 subfamily member 3); MPP3 is a scaffolding protein that colocalizes with MPP5 and CRB1 at the subdpical region adjacent to adherens junctions and may function in photoreceptor polarity. It interacts with some nectins and regulates their trafficking and processing. Nectins are cell-cell adhesion proteins involved in the establishment apical-basal polarity at cell adhesion sites. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212972 Cd Length: 62 Bit Score: 41.87 E-value: 9.55e-05

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1105 PSSERTMPtfhavCQviamydymannEDELNFSKGQLINVMNKDDPDWWQ----GETNGLTGLFPS 1166
Cdd:cd12039    10 PYEDRAIP-----CQ-----------EAGLPFKRRDILEVVSQDDPTWWQakrvGDTNLRAGLIPS 59

Third Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212837 [Multi-domain] Cd Length: 57 Bit Score: 41.55 E-value: 9.63e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WW-FGEVHGGRGWFPKSYVKL 934
Cdd:cd11904     4 QALYPFSSSNDEELNFEKGEVMDVIEKPENdpeWWkCRKANGQVGLVPKNYVTV 57

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 41.70 E-value: 9.68e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGE-VHGGRGWFPKSYVKL 934
Cdd:cd11962     1 RAVVLYDYEKDEDNEIELVEGEIVTNIEMvDEDWWMGTnSKGESGLFPSNYVEL 54

First Src Homology 3 domain of Sorbin and SH3 domain containing (Sorbs) proteins and similar domains; This family, also called the vinexin family, is composed predominantly of adaptor proteins containing one sorbin homology (SoHo) and three SH3 domains. Members include the first SH3 domains of Sorbs1 (or ponsin), Sorbs2 (or ArgBP2), Vinexin (or Sorbs3), and similar domains. They are involved in the regulation of cytoskeletal organization, cell adhesion, and growth factor signaling. Members of this family bind multiple partners including signaling molecules like c-Abl, c-Arg, Sos, and c-Cbl, as well as cytoskeletal molecules such as vinculin and afadin. They may have overlapping functions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212715 [Multi-domain] Cd Length: 53 Bit Score: 41.56 E-value: 9.77e-05

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11781     3 RALYPFKAQSAKELSLKKGDIIYIRRQiDKNWYEGEHNGRVGIFPASYVEI 53

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 47.37 E-value: 1.01e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  367 KRKANYERGNMELEKR-RQVLME--------QQQREAERKAQKEKEEWERKQRELQEQEwKKQLELEKRLEKqrelerqr 437
Cdd:PRK03918  186 KRTENIEELIKEKEKElEEVLREineisselPELREELEKLEKEVKELEELKEEIEELE-KELESLEGSKRK-------- 256

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  438 eeerrkeierREAAKQELERQRrlewerlrrqELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRK 517
Cdd:PRK03918  257 ----------LEEKIRELEERI----------EELKKEIEELEEKVKELKELKEKAEEYIKLSEFYEEYLDELREIEKRL 316

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  518 QTQKTELEVLDKQC-DLEIME--IKQLQQELKEYQNKLIYLVPEKQLLN---------ERIKNMQLSNTPDSGISLLHKK 585
Cdd:PRK03918  317 SRLEEEINGIEERIkELEEKEerLEELKKKLKELEKRLEELEERHELYEeakakkeelERLKKRLTGLTPEKLEKELEEL 396

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  586 SSEKEELCQRLKE---QLDALEKETASKLSEMdsfnNQLKcGSMDDCVLQCLLSLLSCLnnlflllKELRESYntqqlaL 662
Cdd:PRK03918  397 EKAKEEIEEEISKitaRIGELKKEIKELKKAI----EELK-KAKGKCPVCGRELTEEHR-------KELLEEY------T 458

                         330       340       350       360       370       380       390
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  663 EQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEA 738
Cdd:PRK03918  459 AELKRIEKELKEIEEKERKLRKELRELEKVLKKESELIKLKELAEQLKELEEKLKKYNLEELEKKAEEYEKLKEKL 534

Src Homology 3 domain of Myosin XVb; Myosin XVb, also called KIAA1783, was named based on its similarity with myosin XVa. It is a transcribed and unprocessed pseudogene whose predicted amino acid sequence contains mutated or deleted amino acid residues that are normally conserved and important for myosin function. The related myosin XVa is important for normal growth of mechanosensory stereocilia of inner ear hair cells. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 213001 Cd Length: 55 Bit Score: 41.40 E-value: 1.04e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12068     4 ALRSYITDDKSLLSFHRGDLIKLLPMAGLEPGWQFGSTGGRSGLFPADIVQ 54

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 47.37 E-value: 1.04e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   351 TQEEEPQKKLPVTFEDKrKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEwkkqlELEKRLEKQ 430
Cdd:TIGR02169  740 EELEEDLSSLEQEIENV-KSELKELEARIEELEEDLHKLEEALNDLEARLSHSRIPEIQAELSKLE-----EEVSRIEAR 813

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   431 RELERQREEERRKEIERREAAKQELERQRRlewerlrrqELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRL 510
Cdd:TIGR02169  814 LREIEQKLNRLTLEKEYLEKEIQELQEQRI---------DLKEQIKSIEKEIENLNGKKEELEEELEELEAALRDLESRL 884

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   511 QD--------------VQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLVP-------------EKQLLN 563
Cdd:TIGR02169  885 GDlkkerdeleaqlreLERKIEELEAQIEKKRKRLSELKAKLEALEEELSEIEDPKGEDEEipeeelsledvqaELQRVE 964

                          250       260       270       280       290       300
                   ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 312176401   564 ERIKNMQLSNTpdsgisllhKKSSEKEELCQR---LKEQLDALEKETASKLSEMDSFNNQLK 622
Cdd:TIGR02169  965 EEIRALEPVNM---------LAIQEYEEVLKRldeLKEKRAKLEEERKAILERIEEYEKKKR 1017

Pleckstrin homology domain-containing family G member 5 and 6 pleckstrin homology (PH) domain; PLEKHG5 has a RhoGEF DH/double-homology domain in tandem with a PH domain which is involved in phospholipid binding. PLEKHG5 activates the nuclear factor kappa B (NFKB1) signaling pathway. Mutations in PLEKHG5 are associated with autosomal recessive distal spinal muscular atrophy. PLEKHG6 (also called MyoGEF) has no known function to date. PH domains have diverse functions, but in general are involved in targeting proteins to the appropriate cellular location or in the interaction with a binding partner. They share little sequence conservation, but all have a common fold, which is electrostatically polarized. Less than 10% of PH domains bind phosphoinositide phosphates (PIPs) with high affinity and specificity. PH domains are distinguished from other PIP-binding domains by their specific high-affinity binding to PIPs with two vicinal phosphate groups: PtdIns(3,4)P2, PtdIns(4,5)P2 or PtdIns(3,4,5)P3 which results in targeting some PH domain proteins to the plasma membrane. A few display strong specificity in lipid binding. Any specificity is usually determined by loop regions or insertions in the N-terminus of the domain, which are not conserved across all PH domains. PH domains are found in cellular signaling proteins such as serine/threonine kinase, tyrosine kinases, regulators of G-proteins, endocytotic GTPases, adaptors, as well as cytoskeletal associated molecules and in lipid associated enzymes.

Pssm-ID: 270064 Cd Length: 100 Bit Score: 42.98 E-value: 1.10e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1421 RKLLHSG--KLYKTKSNK-ELHAFLFNDFLLLTYLVRQfaaasGHEKLfnskssaqfRMYKTPIFLNEVLVKLPTDPSSd 1497
Cdd:cd13244     1 RRLLLEGdlRLKEGKGSKvDVHCFLFTDMLLICKPVKR-----KKDRL---------KVIRPPYLVDKLVVQELKDPGG- 65

                          90       100       110
                  ....*....|....*....|....*....|....*..
gi 312176401 1498 epvFHISHIDR------VYTLRTDNINERTAWVQKIK 1528
Cdd:cd13244    66 ---FLLVYLNEfhtavaAYTFQTSSQEDTRRWLDAIR 99

chromosome segregation protein SMC, primarily archaeal type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. It is found in a single copy and is homodimeric in prokaryotes, but six paralogs (excluded from this family) are found in eukarotes, where SMC proteins are heterodimeric. This family represents the SMC protein of archaea and a few bacteria (Aquifex, Synechocystis, etc); the SMC of other bacteria is described by TIGR02168. The N- and C-terminal domains of this protein are well conserved, but the central hinge region is skewed in composition and highly divergent. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274009 [Multi-domain] Cd Length: 1164 Bit Score: 47.37 E-value: 1.10e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   392 REAERKAQKEKEEWERKQRELQEqewkkqleLEKRLEkqreleRQReeerrkeierreaakQELERQrrlewerlrrQEL 471
Cdd:TIGR02169  663 RGGILFSRSEPAELQRLRERLEG--------LKRELS------SLQ---------------SELRRI----------ENR 703

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   472 LSQKTREQEDIVRLSSRKKSlhlELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNK 551
Cdd:TIGR02169  704 LDELSQELSDASRKIGEIEK---EIEQLEQEEEKLKERLEELEEDLSSLEQEIENVKSELKELEARIEELEEDLHKLEEA 780

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   552 LIYLvpEKQLLNERIKNMQlsntpdsgisllhKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNN--QLKCGSMDDC 629
Cdd:TIGR02169  781 LNDL--EARLSHSRIPEIQ-------------AELSKLEEEVSRIEARLREIEQKLNRLTLEKEYLEKeiQELQEQRIDL 845

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   630 VLQCLLSLLSCLNNLfLLLKELRESYNTQQLALEQLHK----IKRD------KLKEIERKRLE---QIQKKKLED---EA 693
Cdd:TIGR02169  846 KEQIKSIEKEIENLN-GKKEELEEELEELEAALRDLESrlgdLKKErdeleaQLRELERKIEEleaQIEKKRKRLselKA 924

                          330       340       350       360       370       380
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401   694 ARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSetasalVNYRALYPFE 757
Cdd:TIGR02169  925 KLEALEEELSEIEDPKGEDEEIPEEELSLEDVQAELQRVEEEIRALEP------VNMLAIQEYE 982

Src Homology 3 (SH3) domain of Apoptosis Stimulating of p53 protein 2; ASPP2 is the full length form of the previously-identified tumor supressor, p53-binding protein 2 (p53BP2). ASPP2 activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). It plays a central role in regulating apoptosis and cell growth; ASPP2-deficient mice show postnatal death. Downregulated expression of ASPP2 is frequently found in breast tumors, lung cancer, and diffuse large B-cell lymphoma where it is correlated with a poor clinical outcome. ASPP2 contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP2 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212886 [Multi-domain] Cd Length: 57 Bit Score: 41.48 E-value: 1.12e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPD---WWQGETNGLTGLFPSN 1167
Cdd:cd11953     3 VYALWDYEGESDDELSFKEGDCMTILRREDEDeteWWWARLNDKEGYVPRN 53

Src homology 3 domain of the Rho guanine nucleotide exchange factor ARHGEF9; ARHGEF9, also called PEM2 or collybistin, selectively activates Cdc42 by exchanging bound GDP for free GTP. It is highly expressed in the brain and it interacts with gephyrin, a postsynaptic protein associated with GABA and glycine receptors. Mutations in the ARHGEF9 gene cause X-linked mental retardation with associated features like seizures, hyper-anxiety, aggressive behavior, and sensory hyperarousal. ARHGEF9 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212908 Cd Length: 62 Bit Score: 41.62 E-value: 1.18e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  882 LKAQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11975     5 VSAEAVWDHVTMANRELAFKAGDVIKVLDaSNKDWWWGQIDDEEGWFPASFVRL 58

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 41.80 E-value: 1.20e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQE----NWWFGEVHGGRGWFPKSYVKLIP 936
Cdd:cd12003     3 AKALYDNAAESPEELSFRRGDVLMVLKREHgslpGWWLCSLHGQQGIAPANRLRLLP 59

Third Src Homology 3 domain (SH3C) of CD2-associated protein and similar proteins; This subfamily is composed of the third SH3 domain (SH3C) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3C of both proteins have been shown to bind to ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212808 [Multi-domain] Cd Length: 55 Bit Score: 41.18 E-value: 1.21e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNT--SGWWQGELQARgkkrqKGWFPASHVKL 1102
Cdd:cd11875     2 ARVLFDYEAENEDELTLREGDIVTILSKDCedKGWWKGELNGK-----RGVFPDNFVEP 55

C-terminal (or second) Src homology 3 domain of VAV proteins; VAV proteins function both as cytoplasmic guanine nucleotide exchange factors (GEFs) for Rho GTPases and scaffold proteins and they play important roles in cell signaling by coupling cell surface receptors to various effector functions. They play key roles in processes that require cytoskeletal reorganization including immune synapse formation, phagocytosis, cell spreading, and platelet aggregation, among others. Vertebrates have three VAV proteins (VAV1, VAV2, and VAV3). VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212764 [Multi-domain] Cd Length: 54 Bit Score: 41.46 E-value: 1.23e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTGSIGERTGIFPSNYV 1022
Cdd:cd11830     3 KARYDFCARDMRELSLKEGDVVKIYNKKGQqgWWRGEINGRIGWFPSTYV 52

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 41.49 E-value: 1.23e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401  895 ENHLNFSKHDVITVL------EQQENWWFGEVHGGR-GWFPKSYV 932
Cdd:cd11771    14 EMELSLKKGDIVAVLsktdplGRDSEWWKGRTRDGRiGWFPSNYV 58

C-terminal (or second) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212979 [Multi-domain] Cd Length: 53 Bit Score: 41.33 E-value: 1.37e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12046     4 ALFSYEASQPEDLEFQKGDVILVLSKvNEDWLEGQCKGKIGIFPSAFVE 52

Src Homology 3 domain of GTPase Regulator Associated with Focal adhesion kinase 2; GRAF2, also called Rho GTPase activating protein 10 (ARHGAP10) or PS-GAP, is a GAP with activity towards Cdc42 and RhoA. It regulates caspase-activated p21-activated protein kinase-2 (PAK-2p34). GRAF2 interacts with PAK-2p34, leading to its stabilization and decrease of cell death. It is highly expressed in skeletal muscle, and is involved in alpha-catenin recruitment at cell-cell junctions. GRAF2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, a Rho GAP domain, and a C-terminal SH3 domain. The SH3 domain of GRAF binds PKNbeta, a target of the small GTPase Rho. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212998 [Multi-domain] Cd Length: 54 Bit Score: 41.13 E-value: 1.37e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLI-NVMNKDDPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12065     4 AVYPCEAEHSSELSFEVGAIFeDVTLSREPGWLEGTLNGKRGLIPENYVEI 54

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 41.18 E-value: 1.41e-04

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGwfpksyvkLIPGNEVQ 941
Cdd:cd11844     2 ARALYDNVAESPDELAFRRGDILTVLEQNtaglEGWWLCSLRGRQG--------IAPGNRLK 55

Fourth Src homology 3 domain (or SH3D) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN2 is expected to bind protein partners, similar to ITSN1 which has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212927 Cd Length: 59 Bit Score: 41.46 E-value: 1.41e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHG-----GRGWFPKSYVKLI 935
Cdd:cd11994     2 AQVTTAYVASGVEQLSLSPGQLILILKKNSSgWWLGELQArgkkrQKGWFPASHVKLL 59

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 41.19 E-value: 1.44e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11804     2 AVAKHDFKATAEDELSFKKGSILKVLnmEDDPNWYKAELDGKEGLIPKNYI 52

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 46.60 E-value: 1.53e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  355 EPQKKLPVTFEDKRKAnyERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQL-ELEKR------L 427
Cdd:PRK03918  211 EISSELPELREELEKL--EKEVKELEELKEEIEELEKELESLEGSKRKLEEKIRELEERIEELKKEIeELEEKvkelkeL 288

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  428 EKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDivrLSSRKKSLHLELEAVNGKHQQis 507
Cdd:PRK03918  289 KEKAEEYIKLSEFYEEYLDELREIEKRLSRLEEEINGIEERIKELEEKEERLEE---LKKKLKELEKRLEELEERHEL-- 363

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  508 grLQDVqirkQTQKTELEVLDKQcdLEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNM-QLSNTPDSGISLLhKKS 586
Cdd:PRK03918  364 --YEEA----KAKKEELERLKKR--LTGLTPEKLEKELEELEKAKEEIEEEISKITARIGELkKEIKELKKAIEEL-KKA 434

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  587 SEKEELCQRL------KEQLDALEKETASKLSEMDSFNNQLKcgsmddcvlqcllsllsclnnlfLLLKELR--ESYNTQ 658
Cdd:PRK03918  435 KGKCPVCGRElteehrKELLEEYTAELKRIEKELKEIEEKER-----------------------KLRKELRelEKVLKK 491

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  659 QLALEQLHKIKrDKLKEIErKRLEQIQKKKLEDEA---------ARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKt 729
Cdd:PRK03918  492 ESELIKLKELA-EQLKELE-EKLKKYNLEELEKKAeeyeklkekLIKLKGEIKSLKKELEKLEELKKKLAELEKKLDEL- 568


                  ....*...
gi 312176401  730 qeEERKAE 737
Cdd:PRK03918  569 --EEELAE 574

Mitotic checkpoint protein; This family consists of several eukaryotic mitotic checkpoint (Mitotic arrest deficient or MAD) proteins. The mitotic spindle checkpoint monitors proper attachment of the bipolar spindle to the kinetochores of aligned sister chromatids and causes a cell cycle arrest in prometaphase when failures occur. Multiple components of the mitotic spindle checkpoint have been identified in yeast and higher eukaryotes. In S.cerevisiae, the existence of a Mad1-dependent complex containing Mad2, Mad3, Bub3 and Cdc20 has been demonstrated.

Pssm-ID: 461677 [Multi-domain] Cd Length: 660 Bit Score: 46.66 E-value: 1.53e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   368 RKANYERGNMELEKRRQVLMEQQQR--EAERKAQ---KEKEEWERKQRELQEQEWKKQlELEKRLEKQrelerqreeerR 442
Cdd:pfam05557  116 LRRQIQRAELELQSTNSELEELQERldLLKAKASeaeQLRQNLEKQQSSLAEAEQRIK-ELEFEIQSQ-----------E 183

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   443 KEIERREAAKQELERqrrlewerlrRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNG------KHQQISGRLQDVQIR 516
Cdd:pfam05557  184 QDSEIVKNSKSELAR----------IPELEKELERLREHNKHLNENIENKLLLKEEVEDlkrkleREEKYREEAATLELE 253

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   517 KQTQKTEL---EVLDKQCDLEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLSNTP--------DSGISLLHKK 585
Cdd:pfam05557  254 KEKLEQELqswVKLAQDTGLNLRSPEDLSRRIEQLQQREIVLKEENSSLTSSARQLEKARREleqelaqyLKKIEDLNKK 333

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   586 SSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQL-----------KCGSMDDcVLQCLLSLLSCLNNLFLLLKELRES 654
Cdd:pfam05557  334 LKRHKALVRRLQRRVLLLTKERDGYRAILESYDKELtmsnyspqlleRIEEAED-MTQKMQAHNEEMEAQLSVAEEELGG 412

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   655 YNTQQLALEQLHKIKR---------------DKLK------EIERKRLEQiQKKKLEDEAARKAKQGKENLWR------- 706
Cdd:pfam05557  413 YKQQAQTLERELQALRqqesladpsyskeevDSLRrkletlELERQRLRE-QKNELEMELERRCLQGDYDPKKtkvlhls 491

                          410       420       430       440       450
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   707 -------ESIRKEEEEK-QKRLQEEKSQDKTQEEERKAEAKQSETASALVNYRAL 753
Cdd:pfam05557  492 mnpaaeaYQQRKNQLEKlQAEIERLKRLLKKLEDDLEQVLRLPETTSTMNFKEVL 546

Src Homology 3 domain of SH3 domain and tetratricopeptide repeat-containing (SH3TC) proteins and similar domains; This subfamily is composed of vertebrate SH3TC proteins and hypothetical fungal proteins containing BAR and SH3 domains. Mammals contain two SH3TC proteins, SH3TC1 and SH3TC2. The function of SH3TC1 is unknown. SH3TC2 is localized in Schwann cells in the peripheral nervous system, where it interacts with Rab11 and plays a role in peripheral nerve myelination. Mutations in SH3TC2 are associated with Charcot-Marie-Tooth disease type 4C, a severe hereditary peripheral neuropathy with symptoms that include progressive scoliosis, delayed age of walking, muscular atrophy, distal weakness, and reduced nerve conduction velocity. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212818 Cd Length: 55 Bit Score: 40.76 E-value: 1.68e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVT---QKDGEWWTGSIGE--RTGIFPSNYV 1022
Cdd:cd11885     4 AKMDFEGVEPGELSFRQGDSIEIIgdlIPGLQWFVGRSKSsgRVGFVPTNHF 55

NIMA-related protein kinase; Provisional

Pssm-ID: 173502 [Multi-domain] Cd Length: 1021 Bit Score: 46.65 E-value: 1.69e-04

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401  653 ESYNTQQLALE-------QLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEK 724
Cdd:PTZ00266  441 EKENAHRKALEmkilekkRIERLEREERERLERERMERIERERLERERLERERLERDRLERDRLDRLERERVDRLERDR 519

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 40.81 E-value: 1.71e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1118 CQVIamYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETN--GLTGLFPSNYV 1169
Cdd:cd11761     4 CKVL--YSYEAQRPDELTITEGEELEVIEDGDGDGWVKARNksGEVGYVPENYL 55

N-terminal Src homology 3 domain of GRB2-related adaptor protein; GRAP is a GRB-2 like adaptor protein that is highly expressed in lymphoid tissues. It acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. It has been identified as a regulator of TGFbeta signaling in diabetic kidney tubules and may have a role in the pathogenesis of the disease. GRAP contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. The N-terminal SH3 domain of the related protein GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212881 [Multi-domain] Cd Length: 54 Bit Score: 40.95 E-value: 1.81e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVT--QKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11948     3 VALYSFQATESDELPFQKGDILKILnmEDDQNWYKAELQGREGYIPKNYIK 53

Src Homology 3 domain of fungal peroxisomal membrane protein Pex13p; Pex13p, located in the peroxisomal membrane, contains two transmembrane regions and a C-terminal SH3 domain. It binds to the peroxisomal targeting type I (PTS1) receptor Pex5p and the docking factor Pex14p through its SH3 domain. It is essential for both PTS1 and PTS2 protein import pathways into the peroxisomal matrix. Pex13p binds Pex14p, which contains a PxxP motif, in a classical fashion to the proline-rich ligand binding site of its SH3 domain. It binds the WxxxF/Y motif of Pex5p in a novel site that does not compete with Pex14p binding. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212705 [Multi-domain] Cd Length: 60 Bit Score: 41.11 E-value: 1.81e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  976 ALYSYSSVEPG-DLTFTEGEEILVTQK------DGEWWTGSIGE-RTGIFPSNYV 1022
Cdd:cd11771     4 ALYDFTPENPEmELSLKKGDIVAVLSKtdplgrDSEWWKGRTRDgRIGWFPSNYV 58

C2 domain first repeat present in Synaptotagmin-like proteins; All Slp members basically share an N-terminal Slp homology domain (SHD) and C-terminal tandem C2 domains (named the C2A domain and the C2B domain) with the SHD and C2 domains being separated by a linker sequence of various length. Slp1/JFC1 and Slp2/exophilin 4 promote granule docking to the plasma membrane. Additionally, their C2A domains are both Ca2+ independent, unlike the case in Slp3 and Slp4/granuphilin in which their C2A domains are Ca2+ dependent. It is thought that SHD (except for the Slp4-SHD) functions as a specific Rab27A/B-binding domain. In addition to Slps, rabphilin, Noc2, and Munc13-4 also function as Rab27-binding proteins. It has been demonstrated that Slp3 and Slp4/granuphilin promote dense-core vesicle exocytosis. Slp5 mRNA has been shown to be restricted to human placenta and liver suggesting a role in Rab27A-dependent membrane trafficking in specific tissues. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176056 [Multi-domain] Cd Length: 123 Bit Score: 43.01 E-value: 1.82e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1550 SQKTSGigrLMVHVIEATELKACKP-NGKSNPYCEV------SMGSQSyTTRTLQDTLNPKWNFNCQFFIK--DLYQDVL 1620
Cdd:cd08521    10 NYKTGS---LEVHIKECRNLAYADEkKKRSNPYVKVyllpdkSKQSKR-KTSVKKNTTNPVFNETLKYHISksQLETRTL 85

                          90       100
                  ....*....|....*....|....
gi 312176401 1621 CLTMFDRDQFSPDDFLGRTEVPVA 1644
Cdd:cd08521    86 QLSVWHHDRFGRNTFLGEVEIPLD 109

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 40.90 E-value: 1.85e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12017     2 YFTIGEFQATIQDGISFQKGQKVEVIDKNPS--GWWYVKIDGKEGWAPSSYIEK 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212855 [Multi-domain] Cd Length: 58 Bit Score: 41.13 E-value: 1.87e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT--GLFPSNYVKM 1171
Cdd:cd11922     2 EAIAKFNFNGDTQVEMSFRKGERITLLRQVDENWYEGRIPGTSrqGIFPITYVDV 56

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 45.61 E-value: 1.88e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   648 LKELRESYNTQQLA--LEQLHKIKRDKLKEIERKRLEQI--QKKKLEDEAARKAKQgkenlwrESIRKEEEEKQKRLQEE 723
Cdd:TIGR02794   91 QKELEQRAAAEKAAkqAEQAAKQAEEKQKQAEEAKAKQAaeAKAKAEAEAERKAKE-------EAAKQAEEEAKAKAAAE 163

                           90       100
                   ....*....|....*....|...
gi 312176401   724 kSQDKTQEEERKAEAKQSETASA 746
Cdd:TIGR02794  164 -AKKKAEEAKKKAEAEAKAKAEA 185

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 40.81 E-value: 1.88e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLY-GSFQGKFGWFPCNYV 801
Cdd:cd11903     4 QTLYPFSSVTEEELNFEKGETMEVIEKPENDPEWWKcKNSRGQVGLVPKNYV 55

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 40.97 E-value: 1.89e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd12073     4 VALYDYQGEGDDEISFDPQETITdIEMVDEGWWKGTCHGHRGLFPANYVE 53

Src homology 3 domain of Endophilin-B; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain two endophilin-B isoforms. Endophilin-B proteins are cytoplasmic proteins expressed mainly in the heart, placenta, and skeletal muscle. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212736 [Multi-domain] Cd Length: 52 Bit Score: 40.73 E-value: 1.91e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLE---QQENWWFGEVHGGRGWFPKSY 931
Cdd:cd11802     1 KARVLYDYDAEDSTELSLLADEVITVYElpgMDEDYMMGERGSQRGKVPVAY 52

Myosin tail; The myosin molecule is a multi-subunit complex made up of two heavy chains and four light chains it is a fundamental contractile protein found in all eukaryote cell types. This family consists of the coiled-coil myosin heavy chain tail region. The coiled-coil is composed of the tail from two molecules of myosin. These can then assemble into the macromolecular thick filament. The coiled-coil region provides the structural backbone the thick filament.

Pssm-ID: 460256 [Multi-domain] Cd Length: 1081 Bit Score: 46.32 E-value: 1.94e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   347 SYQKTQEEEPQKKLP----------VTFEDKRKANyERGNMELEK-RRQV----------LMEQQQREAERKAQKEKEEW 405
Cdd:pfam01576  165 TSNLAEEEEKAKSLSklknkheamiSDLEERLKKE-EKGRQELEKaKRKLegestdlqeqIAELQAQIAELRAQLAKKEE 243

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   406 E-------------------RKQRELQEQewkkQLELEKRLEKQRELERQREEERRKEIERREAAKQELErqrRLEWERL 466
Cdd:pfam01576  244 ElqaalarleeetaqknnalKKIRELEAQ----ISELQEDLESERAARNKAEKQRRDLGEELEALKTELE---DTLDTTA 316

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   467 RRQELLSQKTREQEDIVR-LSSRKKSLHLELEAVNGKHQQISGRLQD---------VQIRKQTQKTELEVLDKQCDLEIM 536
Cdd:pfam01576  317 AQQELRSKREQEVTELKKaLEEETRSHEAQLQEMRQKHTQALEELTEqleqakrnkANLEKAKQALESENAELQAELRTL 396

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   537 EI---------KQLQQELKEYQNKLIYLVPEKQLLNERIKNMQlsNTPDSGISLLhkksSEKEELCQRLKEQLDALE--- 604
Cdd:pfam01576  397 QQakqdsehkrKKLEGQLQELQARLSESERQRAELAEKLSKLQ--SELESVSSLL----NEAEGKNIKLSKDVSSLEsql 470

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   605 KETASKLSEmdSFNNQLKCGSMddcvlqcllsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKrleQI 684
Cdd:pfam01576  471 QDTQELLQE--ETRQKLNLSTR---------------------LRQLEDERNSLQEQLEEEEEAKRNVERQLSTL---QA 524

                          410       420       430       440       450
                   ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401   685 Q----KKKLEDEAArkakqgkenlwreSIRKEEEEKqKRLQEEkSQDKTQEEERKAEAK 739
Cdd:pfam01576  525 QlsdmKKKLEEDAG-------------TLEALEEGK-KRLQRE-LEALTQQLEEKAAAY 568

Variant SH3 domain;

Pssm-ID: 434066 [Multi-domain] Cd Length: 49 Bit Score: 40.68 E-value: 1.95e-04

                           10        20        30        40        50
                   ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:pfam14604    4 PYEPKDDDELSLQRGDVITVIEESEDGWWEGINTGR-----TGLVPANYVE 49

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 40.78 E-value: 1.99e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  882 LKAQALCSWTAKKENHLNFSKHDVITVL--EQQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11946     1 MEAIAKYDFKATADDELSFKRGDILKVLneECDQNWYKAELNGKDGFIPKNYIEM 55

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 40.79 E-value: 2.03e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQgeLQARGKkrqKGWFPASHVK 1101
Cdd:cd12077     8 PYTSQGKDEIGFEKGVTVEVIQKNLEGWWY--IRYLGK---EGWAPASYLK 53

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 41.18 E-value: 2.04e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDP---DWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12001     7 ALYDNVAESPDELSFRKGDIMTVLERDTQgldGWWLCSLHGRQGIVPGNRLKI 59

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 40.72 E-value: 2.04e-04

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 312176401  875 QGQAVENLKAQALcswtakKEnhLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:cd11919     2 PARAKFDFKAQTL------KE--LPLQKGDIVYIYKQiDQNWYEGEHHGRVGIFPRSYIELL 55

C2 domain found in the Human KIAA0528 cDNA clone; The members of this CD are named after the Human KIAA0528 cDNA clone. All members here contain a single C2 repeat. No other information on this protein is currently known. The C2 domain was first identified in PKC. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176070 [Multi-domain] Cd Length: 110 Bit Score: 42.29 E-value: 2.07e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKAC-KPNGKSNPYCEVSMGSQSYTTRTLQDTLNPKWnfNCQFFI-----KDLYQDVLCLTMFDRDQFSP 1632
Cdd:cd08688     1 LKVRVVAARDLPVMdRSSDLTDAFVEVKFGSTTYKTDVVKKSLNPVW--NSEWFRfevddEELQDEPLQIRVMDHDTYSA 78


                  ....*....
gi 312176401 1633 DDFLGRTEV 1641
Cdd:cd08688    79 NDAIGKVYI 87

Third N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212730 Cd Length: 51 Bit Score: 40.42 E-value: 2.16e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11796     4 VLQDLSAQLDEELDLREGDVVTITGiLDKGWFRGELNGRRGIFPEGFV 51

C2 domain present in Soybean genes Regulated by Cold 2 (SRC2)-like proteins; SRC2 production is a response to pathogen infiltration. The initial response of increased Ca2+ concentrations are coupled to downstream signal transduction pathways via calcium binding proteins. SRC2 contains a single C2 domain which localizes to the plasma membrane and is involved in Ca2+ dependent protein binding. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 176016 [Multi-domain] Cd Length: 125 Bit Score: 42.60 E-value: 2.16e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1563 VIEATELKACKPNGKSNPYCEVSM-GSQSYTTRTlqDTL---NPKWNFNCQFFIKD--LYQDVLCLTM--FDRDQFSPDD 1634
Cdd:cd04051     6 IISAEDLKNVNLFGKMKVYAVVWIdPSHKQSTPV--DRDggtNPTWNETLRFPLDErlLQQGRLALTIevYCERPSLGDK 83

                          90
                  ....*....|
gi 312176401 1635 FLGRTEVPVA 1644
Cdd:cd04051    84 LIGEVRVPLK 93

PAT complex subunit CCDC47; This family represents CCDC47 proteins which are a component of the PAT complex, an endoplasmic reticulum (ER)-resident membrane multiprotein complex that facilitates multi-pass membrane proteins insertion into membranes. The PAT complex, formed by CCDC47 and Asterix proteins, acts as an intramembrane chaperone by directly interacting with nascent transmembrane domains (TMDs), releasing its substrates upon correct folding, and is needed for optimal biogenesis of multi-pass membrane proteins. CCDC47 is required to maintain the stability of Asterix. CCDC47 is associated with various membrane-associated processes and is component of a ribosome-associated ER translocon complex involved in multi-pass membrane protein transport into the ER membrane and biogenesis. It is also involved in the regulation of calcium ion homeostasis in the ER, being also required for proper protein degradation via the ERAD (ER-associated degradation) pathway.

Pssm-ID: 462322 Cd Length: 323 Bit Score: 45.25 E-value: 2.17e-04

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401   365 EDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKrlEKQ 430
Cdd:pfam07946  257 EALKKAKKTREEEIEKIKKAAEEERAEEAQEKKEEAKKKEREEKLAKLSPEEQRKYEEKER--KKE 320

First Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the first SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213008 Cd Length: 55 Bit Score: 40.83 E-value: 2.19e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1048 VTSAYAASGTEQLSLAPGQLILILKKNTSGWWqgelqARGKKRQKGWFPAS 1098
Cdd:cd12075     5 VVANYQKQESSEISLYVGQVVDIIEKNESGWW-----FVSTADEQGWVPAT 50

C2 domain second repeat in Munc13 (mammalian uncoordinated)-like proteins; C2-like domains are thought to be involved in phospholipid binding in a Ca2+ independent manner in both Unc13 and Munc13. Caenorabditis elegans Unc13 has a central domain with sequence similarity to PKC, which includes C1 and C2-related domains. Unc13 binds phorbol esters and DAG with high affinity in a phospholipid manner. Mutations in Unc13 results in abnormal neuronal connections and impairment in cholinergic neurotransmission in the nematode. Munc13 is the mammalian homolog which are expressed in the brain. There are 3 isoforms (Munc13-1, -2, -3) and are thought to play a role in neurotransmitter release and are hypothesized to be high-affinity receptors for phorbol esters. Unc13 and Munc13 contain both C1 and C2 domains. There are two C2 related domains present, one central and one at the carboxyl end. Munc13-1 contains a third C2-like domain. Munc13 interacts with syntaxin, synaptobrevin, and synaptotagmin suggesting a role for these as scaffolding proteins. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the third C2 repeat, C2C, and has a type-II topology.

Pssm-ID: 175976 [Multi-domain] Cd Length: 133 Bit Score: 43.00 E-value: 2.21e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1546 YQARSQKtsgigrLMVHVIEATELKACKPNGKSNPYCEVSM-------GSQSYTTRTLQDTLNPKWNFNCQFFIKD---- 1614
Cdd:cd04009    11 YRASEQS------LRVEILNARNLLPLDSNGSSDPFVKVELlprhlfpDVPTPKTQVKKKTLFPLFDESFEFNVPPeqcs 84

                          90       100       110
                  ....*....|....*....|....*....|..
gi 312176401 1615 LYQDVLCLTMFDRDQFSPDDFLGRTEVPVAKI 1646
Cdd:cd04009    85 VEGALLLFTVKDYDLLGSNDFEGEAFLPLNDI 116

Src Homology 3 (SH3) domain of Inhibitor of ASPP protein (iASPP); iASPP, also called RelA-associated inhibitor (RAI), is an oncoprotein that inhibits the apoptotic transactivation potential of p53. It is upregulated in human breast cancers expressing wild-type p53, in acute leukemias regardless of the p53 mutation status, as well as in ovarian cancer where it is associated with poor patient outcome and chemoresistance. iASPP is also a binding partner and negative regulator of p65RelA, which promotes cell proliferation and inhibits apoptosis; p65RelA has the opposite effect on cell growth compared to the p53 family. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of iASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212885 [Multi-domain] Cd Length: 56 Bit Score: 40.68 E-value: 2.21e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLE---QQENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11952     5 ALWDYSAEFPDELSFKEGDMVTVLRkdgEGTDWWWASLCGREGYVPRNYFGL 56

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 40.65 E-value: 2.22e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  754 YPFEARNHDEMSFSSGDIIQVDEKTVGepGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12052     6 FDYKAQHEDELTITVGDIITKIKKDDG--GWWEGEIKGRRGLFPDNFVRE 53

Src homology 3 domain of Abl Interactor proteins; Abl interactor (Abi) proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. They localize to sites of actin polymerization in epithelial adherens junction and immune synapses, as well as to the leading edge of lamellipodia. Vertebrates contain two Abi proteins, Abi1 and Abi2. Abi1 displays a wide expression pattern while Abi2 is highly expressed in the eye and brain. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212760 [Multi-domain] Cd Length: 52 Bit Score: 40.38 E-value: 2.22e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHV 1100
Cdd:cd11826     7 DYTADKDDELSFQEGDIIYVTKKNDDGWYEGVLNGV-----TGLFPGNYV 51

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 40.45 E-value: 2.27e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWqgeLQARGKKRQKGWFPASHVKL 1102
Cdd:cd11858     8 FAGSVANELSLKKDDIVYIVQKEDNGWW---LAKKLDESKEGWVPAAYLEE 55

Src homology 3 domain of Protein kinase C and Casein kinase Substrate in Neurons 1 (PACSIN1) and PACSIN 2; PACSIN 1 or Syndapin I (Synaptic dynamin-associated protein I) is expressed specifically in the brain and is localized in neurites and synaptic boutons. It binds the brain-specific proteins dynamin I, synaptojanin, synapsin I, and neural Wiskott-Aldrich syndrome protein (nWASP), and functions as a link between the cytoskeletal machinery and synaptic vesicle endocytosis. PACSIN 1 interacts with huntingtin and may be implicated in the neuropathology of Huntington's disease. PACSIN 2 or Syndapin II is expressed ubiquitously and is involved in the regulation of tubulin polymerization. It associates with Golgi membranes and forms a complex with dynamin II which is crucial in promoting vesicle formation from the trans-Golgi network. PACSINs act as regulators of cytoskeletal and membrane dynamics. Vetebrates harbor three isoforms with distinct expression patterns and specific functions. PACSINs contain an N-terminal F-BAR domain and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212931 [Multi-domain] Cd Length: 56 Bit Score: 40.70 E-value: 2.31e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTGSI-GERTGIFPSNYVRP 1024
Cdd:cd11998     5 ALYDYDGQEQDELSFKAGDELTKLEDEDEqgWCKGRLdSGQVGLYPANYVEP 56

First Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212853 [Multi-domain] Cd Length: 55 Bit Score: 40.76 E-value: 2.33e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11920     5 AVYDFKAQTSKELSFKKGDTVYILRKiDQNWYEGEHHGRVGIFPISYV 52

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 40.59 E-value: 2.34e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11956     5 VACFDYTGRTAQELSFKRGDVLLLHSKaSSDWWRGEHNGMRGLIPHKYI 53

C-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The C-terminal SH3 domain of CRK has not been shown to bind any target protein; it acts as a negative regulator of CRK function by stabilizing a structure that inhibits the access by target proteins to the N-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212693 [Multi-domain] Cd Length: 57 Bit Score: 40.55 E-value: 2.34e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401 1046 AQVTSAYaasGTEQLSLAPGQLILILKKNTSGWWQGELqaRGKkrqKGWFPASHVKL 1102
Cdd:cd11759     9 KRVPNAY---DKTALALEVGDLVKVTKINVSGQWEGEL--NGK---VGHFPFTHVEL 57

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 40.36 E-value: 2.35e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12055     3 QVAFSYLPQNEDELELKVGDIIEVVGEV--EEGWWEGVLNGKTGMFPSNFIKE 53

Fourth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212751 [Multi-domain] Cd Length: 50 Bit Score: 40.54 E-value: 2.35e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSY 931
Cdd:cd11817     2 AVALYDFTGETEEDLSFQRGDRILVTEHLDaEWSRGRLNGREGIFPRAF 50

Src Homology 3 domain of beta-Pak Interactive eXchange factor; Beta-PIX, also called Rho guanine nucleotide exchange factor 7 (ARHGEF7) or Cool (Cloned out of Library)-1, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and plays important roles in regulating neuroendocrine exocytosis, focal adhesion maturation, cell migration, synaptic vesicle localization, and insulin secretion. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212994 [Multi-domain] Cd Length: 54 Bit Score: 40.44 E-value: 2.46e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd12061     8 FQQTNEDELSFSKGDVIHVTRVEEGGWWEGTHNGR-----TGWFPSNYVR 52

Src Homology 3 domain of Membrane Protein, Palmitoylated 2 (or MAGUK p55 subfamily member 2); MPP2 is a scaffolding protein that interacts with the non-receptor tyrosine kinase c-Src in epithelial cells to negatively regulate its activity and morphological function. It is one of seven vertebrate homologs of the Drosophila Stardust protein, which is required in establishing cell polarity, and it contains two L27 domains followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212970 Cd Length: 59 Bit Score: 40.71 E-value: 2.47e-04

                          10        20        30
                  ....*....|....*....|....*....|....*...
gi 312176401 1131 EDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPS 1166
Cdd:cd12037    20 EAGLKFRAGDLLQIVNQEDPNWWQAchVEGGSAGLIPS 57

Src homology 3 domain of Hematopoietic lineage cell-specific protein 1; HS1, also called HCLS1 (hematopoietic cell-specific Lyn substrate 1), is a cortactin homolog expressed specifically in hematopoietic cells. It is an actin regulatory protein that binds the Arp2/3 complex and stabilizes branched actin filaments. It is required for cell spreading and signaling in lymphocytes. It regulates cytoskeletal remodeling that controls lymphocyte trafficking, and it also affects tissue invasion and infiltration of leukemic B cells. Like cortactin, HS1 contains an N-terminal acidic domain, several copies of a repeat domain found in cortactin and HS1, a proline-rich region, and a C-terminal SH3 domain. The N-terminal region binds the Arp2/3 complex and F-actin, while the C-terminal region acts as an adaptor or scaffold that can connect varied proteins that bind the SH3 domain within the actin network. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213006 [Multi-domain] Cd Length: 55 Bit Score: 40.59 E-value: 2.57e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGelQARGKkrqKGWFPASHVKLL 1103
Cdd:cd12073     9 YQGEGDDEISFDPQETITDIEMVDEGWWKG--TCHGH---RGLFPANYVELL 55

C2 domain second repeat present in Synaptotagmins 3, 5, 6, 9, and 10; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 3, a member of class 3 synaptotagmins, is located in the brain and localized to the active zone and plasma membrane. It functions as a Ca2+ sensor for fast exocytosis. It, along with synaptotagmins 5,6, and 10, has disulfide bonds at its N-terminus. Synaptotagmin 9, a class 5 synaptotagmins, is located in the brain and localized to the synaptic vesicles. It is thought to be a Ca2+-sensor for dense-core vesicle exocytosis. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176048 [Multi-domain] Cd Length: 134 Bit Score: 42.88 E-value: 2.66e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMGSQ-----SYTTRTLQDTLNPKWNFNCQFFIKDLYQDVLCLTM--FDRDQ 1629
Cdd:cd08403    14 GRLTLTIIKARNLKAMDITGFSDPYVKVSLMCEgrrlkKKKTSVKKNTLNPTYNEALVFDVPPENVDNVSLIIavVDYDR 93

                          90
                  ....*....|..
gi 312176401 1630 FSPDDFLGRTEV 1641
Cdd:cd08403    94 VGHNELIGVCRV 105

Ca2+-dependent lipid-binding protein, contains C2 domain [General function prediction only];

Pssm-ID: 227371 [Multi-domain] Cd Length: 1227 Bit Score: 45.91 E-value: 2.78e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1556 IGRLMVHVIEATELKACKP--NGKSNPYCEVSMGSQSY-TTRTLQDTLNPKWNFNCQFFIKDLyQDVLCLTMFDRDQFSP 1632
Cdd:COG5038   435 IGVVEVKIKSAEGLKKSDStiNGTVDPYITVTFSDRVIgKTRVKKNTLNPVWNETFYILLNSF-TDPLNLSLYDFNSFKS 513

                          90       100       110       120
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401 1633 DDFLGRTEVPVAKIRtEQESKGPTTRRLLLHEVPTGEvwVRFDLQLF 1679
Cdd:COG5038   514 DKVVGSTQLDLALLH-QNPVKKNELYEFLRNTKNVGR--LTYDLRFF 557

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 40.11 E-value: 2.81e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPS 1019
Cdd:cd11832     2 FIAVKSYSPQEEGEISLHKGDRVKVLSiGEGGFWEGSVRGRTGWFPS 48

Src Homology 3 domain of Myosin XVb; Myosin XVb, also called KIAA1783, was named based on its similarity with myosin XVa. It is a transcribed and unprocessed pseudogene whose predicted amino acid sequence contains mutated or deleted amino acid residues that are normally conserved and important for myosin function. The related myosin XVa is important for normal growth of mechanosensory stereocilia of inner ear hair cells. Myosin XVa contains a unique N-terminal extension followed by a motor domain, light chain-binding IQ motifs, and a tail consisting of a pair of MyTH4-FERM tandems separated by a SH3 domain, and a PDZ domain. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 213001 Cd Length: 55 Bit Score: 40.24 E-value: 2.86e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINV--MNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12068     2 VVALRSYITDDKSLLSFHRGDLIKLlpMAGLEPGWQFGSTGGRSGLFPADIVQ 54

C2 domain second repeat present in Synaptotagmin 7; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 7, a member of class 2 synaptotagmins, is located in presynaptic plasma membranes in neurons, dense-core vesicles in endocrine cells, and lysosomes in fibroblasts. It has been shown to play a role in regulation of Ca2+-dependent lysosomal exocytosis in fibroblasts and may also function as a vesicular Ca2+-sensor. It is distinguished from the other synaptotagmins by having over 12 splice forms. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176050 [Multi-domain] Cd Length: 136 Bit Score: 42.79 E-value: 2.89e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMGS-----QSYTTRTLQDTLNPKWNfncQFFIKDLYQDVL-----CLTMFD 1626
Cdd:cd08405    15 NRITVNIIKARNLKAMDINGTSDPYVKVWLMYkdkrvEKKKTVIKKRTLNPVFN---ESFIFNIPLERLrettlIITVMD 91

                          90
                  ....*....|..
gi 312176401 1627 RDQFSPDDFLGR 1638
Cdd:cd08405    92 KDRLSRNDLIGK 103

cell envelope integrity inner membrane protein TolA; Provisional

Pssm-ID: 236545 [Multi-domain] Cd Length: 387 Bit Score: 45.18 E-value: 2.93e-04

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401  368 RKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEW-ERKQRELQEQEWKKQLELEKRLEKQ 430
Cdd:PRK09510   66 RQQQQQKSAKRAEEQRKKKEQQQAEELQQKQAAEQERLkQLEKERLAAQEQKKQAEEAAKQAAL 129

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 40.39 E-value: 2.95e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQ--ENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11978     3 AIARYDFCARDMRELSLLKGDVVKIYTKMstNGWWRGEVNGRVGWFPSTYVE 54

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 40.34 E-value: 2.98e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYV 801
Cdd:cd11926     2 YVAIYPYTPRKEDELELRKGEMFLVFERC--QDGWFKGTsmHTSKIGVFPGNYV 53

Second Src Homology 3 domain of FCH and double SH3 domains protein 1; FCHSD1 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212828 Cd Length: 58 Bit Score: 40.33 E-value: 2.98e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGE--PGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:cd11895     3 RALYSYTGQSPEELSFPEGALIRLLPRAQDGvdDGFWRGEFGGRVGVFPSLLVEEL 58

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 45.83 E-value: 3.03e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  380 EKRRQVLMEQQQREAERkAQKEKEEWERKQRELQEQEwkkqLELEKRLEKQRELERQREEERRKEIERREAAKQELERqr 459
Cdd:PRK03918  447 EEHRKELLEEYTAELKR-IEKELKEIEEKERKLRKEL----RELEKVLKKESELIKLKELAEQLKELEEKLKKYNLEE-- 519

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  460 rlewerlrrqelLSQKTRE----QEDIVRLSSRKKSLHLELEavngKHQQISGRLQDVQIRKQTQKTEL-EVLDKQCDLE 534
Cdd:PRK03918  520 ------------LEKKAEEyeklKEKLIKLKGEIKSLKKELE----KLEELKKKLAELEKKLDELEEELaELLKELEELG 583

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  535 IMEIKQLQ---QELKEYQNKLIYLVPEKQLLNERIKNMQ-LSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETASK 610
Cdd:PRK03918  584 FESVEELEerlKELEPFYNEYLELKDAEKELEREEKELKkLEEELDKAFEELAETEKRLEELRKELEELEKKYSEEEYEE 663

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  611 LS-EMDSFNNQLkcgsmddcvlqcllsllsclnnlFLLLKELRESYNTQQLALEQLHKIKRDKlKEIE--RKRLEQIQKK 687
Cdd:PRK03918  664 LReEYLELSREL-----------------------AGLRAELEELEKRREEIKKTLEKLKEEL-EEREkaKKELEKLEKA 719

                         330       340       350       360       370
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  688 KLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAE 737
Cdd:PRK03918  720 LERVEELREKVKKYKALLKERALSKVGEIASEIFEELTEGKYSGVRVKAE 769

Src homology 3 domain of Slit-Robo GTPase Activating Protein 4; srGAP4, also called ARHGAP4, is highly expressed in hematopoietic cells and may play a role in lymphocyte differentiation. It is able to stimulate the GTPase activity of Rac1, Cdc42, and RhoA. In the nervous system, srGAP4 has been detected in differentiating neurites and may be involved in axon and dendritic growth. srGAPs are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212889 [Multi-domain] Cd Length: 55 Bit Score: 40.21 E-value: 3.05e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  882 LKAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11956     2 VEAVACFDYTGRTAQELSFKRGDVLLLHSKaSSDWWRGEHNGMRGLIPHKYISV 55

Second C-terminal Src homology 3 domain of Rho guanine nucleotide exchange factor 37; ARHGEF37 contains a RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. Its specific function is unknown. Its domain architecture is similar to the C-terminal half of DNMBP or Tuba, a cdc42-specific GEF that provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics, and plays an important role in regulating cell junction configuration. GEFs activate small GTPases by exchanging bound GDP for free GTP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212874 Cd Length: 57 Bit Score: 40.28 E-value: 3.05e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDD----PDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11941     1 QVVAAYPFTARSKHEVSLQAGQPVTVLEPHDkkgsPEWSLVEVNGQRGYVPSSYL 55

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 44.84 E-value: 3.07e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   663 EQLHKIKRDKLKEIERKRLEQIQKKKLED-----------EAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQE 731
Cdd:TIGR02794   68 ERQKKLEQQAEEAEKQRAAEQARQKELEQraaaekaakqaEQAAKQAEEKQKQAEEAKAKQAAEAKAKAEAEAERKAKEE 147

                           90
                   ....*....|....*
gi 312176401   732 EERKAEAKQSETASA 746
Cdd:TIGR02794  148 AAKQAEEEAKAKAAA 162

Third Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The third SH3 domain of Nck appears to prefer ligands with a PxAPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212836 [Multi-domain] Cd Length: 59 Bit Score: 40.43 E-value: 3.08e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  977 LYSYSSVEPGDLTFTEGEEILVTQK---DGEWW--TGSIGErTGIFPSNYV 1022
Cdd:cd11903     6 LYPFSSVTEEELNFEKGETMEVIEKpenDPEWWkcKNSRGQ-VGLVPKNYV 55

Ca2+-binding protein, EF-hand superfamily [Signal transduction mechanisms];

Pssm-ID: 444056 [Multi-domain] Cd Length: 137 Bit Score: 42.47 E-value: 3.09e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*....
gi 312176401  250 RQKFNSLDKGMSGYLSGFQARNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMH 308
Cdd:COG5126    72 RAAFDLLDTDGDGKISADEFRRLLTALGVSEEEADELFARLDTDGDGKISFEEFVAAVR 130

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 40.14 E-value: 3.13e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQ--GKFGWFPCNYVEK 803
Cdd:cd11785     2 YRVIVPYPPQSEAELELKEGDIVFVHKKR--EDGWFKGTLQrtGKTGLFPGSFVES 55

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 40.10 E-value: 3.25e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*.
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQVdeKTVGEPGWLYGSFQGKFGWFP 797
Cdd:cd11797     4 ALYRFQALEPNELDFEVGDRIRI--IATLEDGWLEGELKGRRGIFP 47

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF16 and ARHGEF26; ARHGEF16, also called ephexin-4, acts as a GEF for RhoG, activating it by exchanging bound GDP for free GTP. RhoG is a small GTPase that is a crucial regulator of Rac in migrating cells. ARHGEF16 interacts directly with the ephrin receptor EphA2 and mediates cell migration and invasion in breast cancer cells by activating RhoG. ARHGEF26, also called SGEF (SH3 domain-containing guanine exchange factor), also activates RhoG. It is highly expressed in liver and may play a role in regulating membrane dynamics. ARHGEF16 and ARHGEF26 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212871 Cd Length: 55 Bit Score: 40.21 E-value: 3.29e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1047 QVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGElqaRGKKRQKGWFPASHVK 1101
Cdd:cd11938     3 EIIKAYTAKQPDELSLQQADVVLVLQTESDGWYYGE---RLRDGERGWFPSSCAK 54

Src Homology 3 domain of alpha-Pak Interactive eXchange factor; Alpha-PIX, also called Rho guanine nucleotide exchange factor 6 (ARHGEF6) or Cool (Cloned out of Library)-2, activates small GTPases by exchanging bound GDP for free GTP. It acts as a GEF for both Cdc42 and Rac 1, and is localized in dendritic spines where it regulates spine morphogenesis. It controls dendritic length and spine density in the hippocampus. Mutations in the ARHGEF6 gene cause X-linked intellectual disability in humans. PIX proteins contain an N-terminal SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains, and a C-terminal leucine-zipper domain for dimerization. The SH3 domain of PIX binds to an atypical PxxxPR motif in p21-activated kinases (PAKs) with high affinity. The binding of PAKs to PIX facilitate the localization of PAKs to focal complexes and also localizes PAKs to PIX targets Cdc43 and Rac, leading to the activation of PAKs. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212993 Cd Length: 58 Bit Score: 40.37 E-value: 3.34e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....
gi 312176401 1058 EQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd12060    16 DELSVCKGDIIYVTRVEEGGWWEGTLNGK-----TGWFPSNYVR 54

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 40.36 E-value: 3.45e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSiGERT---GIFPSNYVRP 1024
Cdd:cd11916     4 YQALYSYAPQNDDELELRDGDIVDVMEKcDDGWFVGT-SRRTkqfGTFPGNYVKL 57

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 40.02 E-value: 3.49e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401  890 WTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12077     9 YTSQGKDEIGFEKGVTVEVIQKNlEGWWYIRYLGKEGWAPASYLK 53

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 40.02 E-value: 3.52e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEK-TVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11844     3 RALYDNVAESPDELAFRRGDILTVLEQnTAGLEGWWLCSLRGRQGIAPGNRLK 55

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 40.01 E-value: 3.52e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  975 IALYSYssvEPGD------LTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNY 1021
Cdd:cd11787     3 KALYDF---EMKDedekdcLTFKKGDVITVIRRvDENWAEGRLGDKIGIFPISF 53

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 45.68 E-value: 3.58e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  538 IKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQlsnTPDSGISLLHKKSSEKEELcQRLKEQLDALEKEtaskLSEMDSF 617
Cdd:COG4913   612 LAALEAELAELEEELAEAEERLEALEAELDALQ---ERREALQRLAEYSWDEIDV-ASAEREIAELEAE----LERLDAS 683

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  618 NNQLKcgsmddcVLQCLlsllsclnnlfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKA 697
Cdd:COG4913   684 SDDLA-------ALEEQ-------------LEELEAELEELEEELDELKGEIGRLEKELEQAEEELDELQDRLEAAEDLA 743

                         170       180       190       200       210       220       230
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  698 KQGK----ENLWRESIRKE-EEEKQKRLQEEksqdkTQEEERKAEAKQSETASALVNYRALYPFEARNHD 762
Cdd:COG4913   744 RLELrallEERFAAALGDAvERELRENLEER-----IDALRARLNRAEEELERAMRAFNREWPAETADLD 808

Second Src homology 3 domain (or SH3B) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The second SH3 domain (or SH3B) of ITSN1 has been shown to bind WNK and CdGAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212771 [Multi-domain] Cd Length: 53 Bit Score: 40.04 E-value: 3.58e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1047 QVTSAYAASGTE--QLSLAPGQLILILKKNTSgWWQGELQargkKRQKGWFPASHVKL 1102
Cdd:cd11837     1 TATALYPWRAKKenHLSFAKGDIITVLEQQEM-WWFGELE----GGEEGWFPKSYVKE 53

Fourth Src homology 3 domain (or SH3D) of Intersectin; Intersectins (ITSNs) are adaptor proteins that function in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. They are essential for initiating clathrin-coated pit formation. They bind to many proteins through their multidomain structure and facilitate the assembly of multimeric complexes. Vertebrates contain two ITSN proteins, ITSN1 and ITSN2, which exist in alternatively spliced short and long isoforms. The short isoforms contain two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoforms, in addition, contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. ITSN1 and ITSN2 are both widely expressed, with variations depending on tissue type and stage of development. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212773 [Multi-domain] Cd Length: 58 Bit Score: 40.01 E-value: 3.58e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  979 SYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSI-----GERTGIFPSNYVR 1023
Cdd:cd11839     7 PFTATAENQLSLAVGQLVLVRKKSPSgWWEGELqargkKRQIGWFPANYVK 57

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 40.07 E-value: 3.81e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-----WWFGEVHGGRGWFP 928
Cdd:cd11762     2 VRALYDYEAQSDEELSFPEGAIIRILRKDDNgvddgWWEGEFNGRVGVFP 51

Src Homology 3 domain of Mixed Lineage Kinases; MLKs are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Mammals have four MLKs (MLK1-4), mostly conserved in vertebrates, which contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212809 [Multi-domain] Cd Length: 58 Bit Score: 40.19 E-value: 3.83e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTS-----GWWQGELQARgkkrqKGWFPASHV 1100
Cdd:cd11876     8 YDARGEDELTLRRGQPVEVLSKDAAvsgdeGWWTGKIGDK-----VGIFPSNYV 56

Src homology 3 domain of Ubiquitin-associated and SH3 domain-containing protein A; UBASH3A is also called Cbl-Interacting Protein 4 (CLIP4), T cell Ubiquitin LigAnd (TULA), or T cell receptor Signaling (STS)-2. It is only found in lymphoid cells and exhibits weak phosphatase activity. UBASH3A facilitates T cell-induced apoptosis through interaction with the apoptosis-inducing factor AIF. It is involved in regulating the level of phosphorylation of the zeta-associated protein (ZAP)-70 tyrosine kinase. TULA proteins contain an N-terminal UBA domain, a central SH3 domain, and a C-terminal histidine phosphatase domain. They bind c-Cbl through the SH3 domain and to ubiquitin via UBA. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212870 [Multi-domain] Cd Length: 60 Bit Score: 40.00 E-value: 4.03e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVD--EKTVGEPGWLYGSFQ--GKFGWFPCNYVEK 803
Cdd:cd11937     4 RALFQYKPQNIDELMLSPGDYIFVDptQQSEASEGWVIGISHrtGCRGFLPENYTER 60

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 39.86 E-value: 4.15e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTV-GEPGWLYGSFQGKFGWFPCN 799
Cdd:cd12000     4 RALYDNKADCSDELAFRRGDILTVLEQNVpGSEGWWKCLLHGRQGLAPAN 53

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 39.73 E-value: 4.29e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVdeKTVGEPGWLYGSFQGKFGWFP 797
Cdd:cd11832     2 FIAVKSYSPQEEGEISLHKGDRVKV--LSIGEGGFWEGSVRGRTGWFP 47

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 39.93 E-value: 4.32e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  753 LYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYVEK 803
Cdd:cd11939     5 VHPYVSQEPDELSLELADVLNILDKT--DDGWIFGErlHDQERGWFPSSVVEE 55

Src Homology 3 domain of Class A and B Dedicator of Cytokinesis proteins; DOCK proteins are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. They are divided into four classes (A-D) based on sequence similarity and domain architecture: class A includes Dock1, 2 and 5; class B includes Dock3 and 4; class C includes Dock6, 7, and 8; and class D includes Dock9, 10 and 11. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. This subfamily includes only Class A and B DOCKs, which also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus. Class A/B DOCKs are mostly specific GEFs for Rac, except Dock4 which activates the Ras family GTPase Rap1, probably indirectly through interaction with Rap regulatory proteins. The SH3 domain of class A/B DOCKs have been shown to bind Elmo, a scaffold protein that promotes GEF activity of DOCKs by releasing DHR-2 autoinhibition by the intramolecular SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212805 [Multi-domain] Cd Length: 56 Bit Score: 39.87 E-value: 4.39e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNtSGWWQGELQarGKKRQKGWFPASHVKL 1102
Cdd:cd11872     8 FQGDGEHQLSLQVGDTVQILEEC-EGWYRGFSL--RNKSLKGIFPKSYVHI 55

Src homology 3 domain of Proline-Serine-Threonine Phosphatase-Interacting Protein 1; PSTPIP1, also called CD2 Binding Protein 1 (CD2BP1), is mainly expressed in hematopoietic cells. It is a binding partner of the cell surface receptor CD2 and PTP-PEST, a tyrosine phosphatase which functions in cell motility and Rac1 regulation. It also plays a role in the activation of the Wiskott-Aldrich syndrome protein (WASP), which couples actin rearrangement and T cell activation. Mutations in the gene encoding PSTPIP1 cause the autoinflammatory disorder known as PAPA (pyogenic sterile arthritis, pyoderma gangrenosum, and acne) syndrome. PSTPIP1 contains an N-terminal F-BAR domain, PEST motifs, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212758 [Multi-domain] Cd Length: 53 Bit Score: 39.66 E-value: 4.47e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGElqargKKRQKGWFPASHVKL 1102
Cdd:cd11824     2 YSVLYDYTAQEDDELSISKGDVVAVIEKGEDGWWTVE-----RNGQKGLVPGTYLEK 53

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 39.62 E-value: 4.50e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11874     1 RCKVLFSYTPQNEDELELKVGDTIEVLGEvEEGWWEGKLNGKVGVFPSNFVKE 53

Second Src homology 3 domain of Tyrosine kinase substrate with four SH3 domains; Tks4, also called SH3 and PX domain-containing protein 2B (SH3PXD2B) or HOFI, is a Src substrate and scaffolding protein that plays an important role in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. It is required in the formation of functional podosomes, EGF-induced membrane ruffling, and lamellipodia generation. It plays an important role in cellular attachment and cell spreading. Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. It contains an N-terminal Phox homology (PX) domain and four SH3 domains. This model characterizes the second SH3 domain of Tks4. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213009 [Multi-domain] Cd Length: 54 Bit Score: 39.63 E-value: 4.51e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12076     2 KYTVIYPYTARDQDEINLEKGAVVEVIQKNlEGWWKIRYQGKEGWAPASYLK 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 39.61 E-value: 4.61e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGG---RGWFPKSY 931
Cdd:cd11821     1 RVRALYDCQADNDDELTFSEGEIIVVTgEEDDEWWEGHIEGDpsrRGVFPVSF 53

C2 domain third repeat found in Multiple C2 domain and Transmembrane region Proteins (MCTP); plant subset; MCTPs are involved in Ca2+ signaling at the membrane. Plant-MCTPs are composed of a variable N-terminal sequence, four C2 domains, two transmembrane regions (TMRs), and a short C-terminal sequence. It is one of four protein classes that are anchored to membranes via a transmembrane region; the others being synaptotagmins, extended synaptotagmins, and ferlins. MCTPs are the only membrane-bound C2 domain proteins that contain two functional TMRs. MCTPs are unique in that they bind Ca2+ but not phospholipids. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the third C2 repeat, C2C, and has a type-II topology.

Pssm-ID: 175986 [Multi-domain] Cd Length: 150 Bit Score: 42.27 E-value: 4.61e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKACKPNGKSNPYCEVSMGSQSYTTRTLQD-TLNPKWNFNCQFFIKDLYQDVLCLTMFDRDQFSPDDFLG 1637
Cdd:cd04019     2 LRVTVIEAQDLVPSDKNRVPEVFVKAQLGNQVLRTRPSQTrNGNPSWNEELMFVAAEPFEDHLILSVEDRVGPNKDEPLG 81


                  ....*....
gi 312176401 1638 RTEVPVAKI 1646
Cdd:cd04019    82 RAVIPLNDI 90

First Src Homology 3 domain of Bud emergence protein 1 and similar domains; Members of this subfamily bear similarity to Saccharomyces cerevisiae Bem1p, containing two Src Homology 3 (SH3) domains at the N-terminus, a central PX domain, and a C-terminal PB1 domain. Bem1p is a scaffolding protein that is critical for proper Cdc42p activation during bud formation in yeast. During budding and mating, Bem1p migrates to the plasma membrane where it can serve as an adaptor for Cdc42p and some other proteins. Bem1p also functions as an effector of the G1 cyclin Cln3p and the cyclin-dependent kinase Cdc28p in promoting vacuolar fusion. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212811 [Multi-domain] Cd Length: 54 Bit Score: 39.58 E-value: 4.68e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1120 VI-AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT---GLFPSNY 1168
Cdd:cd11878     1 VIrALYDYRAQTPGELSFSKGDFFHVIGEEDQGEWYEATNPVTgkrGLVPKSY 53

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 39.75 E-value: 4.87e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1048 VTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd12016     5 TTQAYKAENEDEIGFETGVVVEVIQKNLDGWWKIRYQGK-----EGWAPATYLK 53

Coiled-coil domain-containing protein 158; CCDC158 is a family of proteins found in eukaryotes. The function is not known.

Pssm-ID: 464943 [Multi-domain] Cd Length: 1112 Bit Score: 45.11 E-value: 5.16e-04

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   354 EEPQKKLPVTFEDKRKANYER-------GNMElEKRRQVLMEQQQREAERKAQKE--KEEWERK----------QRELQE 414
Cdd:pfam15921  345 EELEKQLVLANSELTEARTERdqfsqesGNLD-DQLQKLLADLHKREKELSLEKEqnKRLWDRDtgnsitidhlRRELDD 423

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   415 QEWKKQlelekRLEKQRELERQREEERRKEIERREAAKQE-LERQRRLEWERLRRQELLSQKTREqedivrLSSRKkslh 493
Cdd:pfam15921  424 RNMEVQ-----RLEALLKAMKSECQGQMERQMAAIQGKNEsLEKVSSLTAQLESTKEMLRKVVEE------LTAKK---- 488

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   494 LELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQN------KLIYLVPEK----QLLN 563
Cdd:pfam15921  489 MTLESSERTVSDLTASLQEKERAIEATNAEITKLRSRVDLKLQELQHLKNEGDHLRNvqteceALKLQMAEKdkviEILR 568

                          250       260       270       280       290
                   ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401   564 ERIKNM-QL--SNTPDSGISLLHKKSSEKEELCQRLK-EQLDALEKETASKLSEMDS 616
Cdd:pfam15921  569 QQIENMtQLvgQHGRTAGAMQVEKAQLEKEINDRRLElQEFKILKDKKDAKIRELEA 625

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 39.50 E-value: 5.20e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WWFGEVHGGRGWFPKSYV 932
Cdd:cd12045     3 QGLWDCTGDQPDELSFKRGDTIYILSKEYNrfgWWVGEMKGTIGLVPKAYI 53

Src homology 3 domain of Rho GTPase-activating proteins 32 and 33, and similar proteins; Members of this family contain N-terminal PX and Src Homology 3 (SH3) domains, a central Rho GAP domain, and C-terminal extensions. RhoGAPs (or ARHGAPs) bind to Rho proteins and enhance the hydrolysis rates of bound GTP. ARHGAP32 is also called RICS, PX-RICS, p250GAP, or p200RhoGAP. It is a Rho GTPase-activating protein for Cdc42 and Rac1, and is implicated in the regulation of postsynaptic signaling and neurite outgrowth. PX-RICS, a variant of RICS that contain PX and SH3 domains, is the main isoform expressed during neural development. It is involved in neural functions including axon and dendrite extension, postnatal remodeling, and fine-tuning of neural circuits during early brain development. ARHGAP33, also called sorting nexin 26 or TCGAP (Tc10/CDC42 GTPase-activating protein), is widely expressed in the brain where it is involved in regulating the outgrowth of axons and dendrites and is regulated by the protein tyrosine kinase Fyn. It is translocated to the plasma membrane in adipocytes in response to insulin and may be involved in the regulation of insulin-stimulated glucose transport. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212769 [Multi-domain] Cd Length: 54 Bit Score: 39.36 E-value: 5.24e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401 1126 YMANNEDELNFSKGQLINVMN---KDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11835     8 YTAQAPDELSLEVGDIVSVIDmppPEESTWWRGKKGFQVGFFPSECV 54

Src Homology 3 domain of Sorting nexin 18; SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. It binds FIP5 and is required for apical lumen formation. It may also play a role in axonal elongation. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX18 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212830 [Multi-domain] Cd Length: 55 Bit Score: 39.59 E-value: 5.30e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWW---TGSIGERtGIFPSNYVR 1023
Cdd:cd11897     4 ALYDFRSENPGEISLREHEVLsLCSEQDIEGWlegVNSRGDR-GLFPASYVE 54

Src Homology 3 domain of Mixed Lineage Kinases 1, 2, and 3; MLKs 1, 2, and 3 are Serine/Threonine Kinases (STKs), catalyzing the transfer of the gamma-phosphoryl group from ATP to S/T residues on protein substrates. MLKs act as mitogen-activated protein kinase kinase kinases (MAP3Ks, MKKKs, MAPKKKs), which phosphorylate and activate MAPK kinases (MAPKKs or MKKs or MAP2Ks), which in turn phosphorylate and activate MAPKs during signaling cascades that are important in mediating cellular responses to extracellular signals. MLKs play roles in immunity and inflammation, as well as in cell death, proliferation, and cell cycle regulation. Little is known about the specific function of MLK1, also called MAP3K9. It is capable of activating the c-Jun N-terminal kinase pathway. Mice lacking both MLK1 and MLK2 are viable, fertile, and have normal life spans. MLK2, also called MAP3K10, is abundant in brain, skeletal muscle, and testis. It functions upstream of the MAPK, c-Jun N-terminal kinase. It binds hippocalcin, a calcium-sensor protein that protects neurons against calcium-induced cell death. Both MLK2 and hippocalcin may be associated with the pathogenesis of Parkinson's disease. MLK3, also called MAP3K11, is highly expressed in breast cancer cells and its signaling through c-Jun N-terminal kinase has been implicated in the migration, invasion, and malignancy of cancer cells. It also functions as a negative regulator of Inhibitor of Nuclear Factor-KappaB Kinase (IKK) and thus, impacts inflammation and immunity. MLKs contain an SH3 domain, a catalytic kinase domain, a leucine zipper, a proline-rich region, and a CRIB domain that mediates binding to GTP-bound Cdc42 and Rac. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212992 [Multi-domain] Cd Length: 58 Bit Score: 39.75 E-value: 5.34e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTS-----GWWQGELQARgkkrqKGWFPASHV 1100
Cdd:cd12059     8 YEASAEDELTLRRGDRVEVLSKDSAvsgdeGWWTGKINDR-----VGIFPSNYV 56

First Src Homology 3 domain (SH3A) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the first SH3 domain (SH3A) of CIN85; SH3A binds to internal proline-rich motifs within the proline-rich region. This intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. SH3A has also been shown to bind ubiquitin and to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic end of the cell adhesion protein CD2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212985 [Multi-domain] Cd Length: 53 Bit Score: 39.49 E-value: 5.39e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401  890 WTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 933
Cdd:cd12052     8 YKAQHEDELTITVGDIITKIKKDDGgWWEGEIKGRRGLFPDNFVR 52

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member 4; CASS4, also called HEPL (HEF1-EFS-p130Cas-like), localizes to focal adhesions and plays a role in regulating FAK activity, focal adhesion integrity, and cell spreading. It is most abundant in blood cells and lung tissue, and is also found in high levels in leukemia and ovarian cell lines. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212933 Cd Length: 57 Bit Score: 39.48 E-value: 5.41e-04

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401  882 LKAQALCSWTAKKENHLNFSKHDVITVLEQQ----ENWWFGEVHGGRGwfpksyvkLIPGNEVQ 941
Cdd:cd12000     1 LLARALYDNKADCSDELAFRRGDILTVLEQNvpgsEGWWKCLLHGRQG--------LAPANRLQ 56

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 1; Shank1, also called SSTRIP (Somatostatin receptor-interacting protein), is a brain-specific protein that plays a role in the construction of postsynaptic density (PSD) and the maturation of dendritic spines. Mice deficient in Shank1 show altered PSD composition, thinner PSDs, smaller dendritic spines, and weaker basal synaptic transmission, although synaptic plasticity is normal. They show increased anxiety and impaired fear memory, but also show better spatial learning. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212915 [Multi-domain] Cd Length: 52 Bit Score: 39.61 E-value: 5.50e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILV-TQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11982     3 FMAVKPYQSQAEGEISLSKGEKIKVlSVGEGGFWEGQVKGRVGWFPSDCV 52

Second Src Homology 3 domain (SH3B) of Cbl-interacting protein of 85 kDa; CIN85, also called SH3 domain-containing kinase-binding protein 1 (SH3KBP1) or CD2-binding protein 3 (CD2BP3) or Ruk, is an adaptor protein that is involved in the downregulation of receptor tyrosine kinases by facilitating endocytosis through interaction with endophilin-associated ubiquitin ligase Cbl proteins. It is also important in many other cellular processes including vesicle-mediated transport, cytoskeletal remodelling, apoptosis, cell adhesion and migration, and viral infection, among others. CIN85 exists as multiple variants from alternative splicing; the main variant contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CIN85. SH3B has been shown to bind Cbl proline-rich peptides and ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212988 [Multi-domain] Cd Length: 53 Bit Score: 39.59 E-value: 5.59e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12055     1 RCQVAFSYLPQNEDELELKVGDIIEVVgEVEEGWWEGVLNGKTGMFPSNFIK 52

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 39.33 E-value: 5.65e-04

                          10        20        30
                  ....*....|....*....|....*....|....*....
gi 312176401  894 KENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSY 931
Cdd:cd12015    12 QPNEISLRAGDVVDVIEKNENgWWFVSLEDEQGWVPATY 50

Src homology 3 domain of SH3 and multiple ankyrin repeat domains (Shank) proteins; Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. They bind a variety of membrane and cytosolic proteins, and exist in alternatively spliced isoforms. They are highly enriched in postsynaptic density (PSD) where they interact with the cytoskeleton and with postsynaptic membrane receptors including NMDA and glutamate receptors. They are crucial in the construction and organization of the PSD and dendritic spines of excitatory synapses. There are three members of this family (Shank1, Shank2, Shank3) which show distinct and cell-type specific patterns of expression. Shank1 is brain-specific; Shank2 is found in neurons, glia, endocrine cells, liver, and kidney; Shank3 is widely expressed. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212766 Cd Length: 50 Bit Score: 39.34 E-value: 5.65e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPS 1166
Cdd:cd11832     1 YFIAVKSYSPQEEGEISLHKGDRVKVLSIGEGGFWEGSVRGRTGWFPS 48

Src homology 3 domain of Fyn and Yrk Protein Tyrosine Kinases; Fyn and Yrk (Yes-related kinase) are members of the Src subfamily of proteins, which are cytoplasmic (or non-receptor) PTKs. Fyn, together with Lck, plays a critical role in T-cell signal transduction by phosphorylating ITAM (immunoreceptor tyr activation motif) sequences on T-cell receptors, ultimately leading to the proliferation and differentiation of T-cells. In addition, Fyn is involved in the myelination of neurons, and is implicated in Alzheimer's and Parkinson's diseases. Yrk has been detected only in chickens. It is primarily found in neuronal and epithelial cells and in macrophages. It may play a role in inflammation and in response to injury. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212939 [Multi-domain] Cd Length: 56 Bit Score: 39.65 E-value: 5.71e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGWLYGSF-QGKFGWFPCNYV 801
Cdd:cd12006     3 FVALYDYEARTEDDLSFHKGEKFQILNSSEGD-WWEARSLtTGETGYIPSNYV 54

Src Homology 3 domain of Saccharomyces cerevisiae Nap1-binding protein 2 and similar fungal proteins; This subfamily includes Saccharomyces cerevisiae Nbp2 (Nucleosome assembly protein 1 (Nap1)-binding protein 2), Schizosaccharomyces pombe Skb5, and similar proteins. Nbp2 interacts with Nap1, which is essential for maintaining proper nucleosome structures in transcription and replication. It is also the binding partner of the yeast type II protein phosphatase Ptc1p and serves as a scaffolding protein that brings seven kinases in close contact to Ptc1p. Nbp2 plays a role many cell processes including organelle inheritance, mating hormone response, cell wall stress, mitotic cell growth at elevated temperatures, and high osmolarity. Skb5 interacts with the p21-activated kinase (PAK) homolog Shk1, which is critical for fission yeast cell viability. Skb5 activates Shk1 and plays a role in regulating cell morphology and growth under hypertonic conditions. Nbp2 and Skb5 contain an SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212799 Cd Length: 55 Bit Score: 39.42 E-value: 5.89e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWW--QGETNGLTGLFPSNYVKM 1171
Cdd:cd11865     1 RAVALYDFEPEHDNELGFAEGQILFILYKHGQGWLiaEDESGGKTGLVPEEFVSY 55

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 39.57 E-value: 5.95e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  977 LYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTGSIGERTGIFPSNYVR 1023
Cdd:cd12054     6 LFEYVPQNEDELELKVGDIIDINEEVEEgWWSGTLNGKSGLFPSNFVK 53

Membrane protein TolA involved in colicin uptake [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442298 [Multi-domain] Cd Length: 485 Bit Score: 44.26 E-value: 6.10e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  349 QKTQEEEPQKKLPvTFEDKRKAN---YERGNMELEKRRQVLMEQQqREAERKAQKEKEEWERKQRELQEQEWKKQLELEK 425
Cdd:COG3064     7 EKAAEAAAQERLE-QAEAEKRAAaeaEQKAKEEAEEERLAELEAK-RQAEEEAREAKAEAEQRAAELAAEAAKKLAEAEK 84


                  ....
gi 312176401  426 RLEK 429
Cdd:COG3064    85 AAAE 88

Second Src Homology 3 domain (SH3B) of CD2-associated protein and similar proteins; This subfamily is composed of the second SH3 domain (SH3B) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3B of both proteins have been shown to bind to Cbl. In the case of CD2AP, its SH3B binds to Cbl at a site distinct from the c-Cbl/SH3A binding site. The CIN85 SH3B also binds ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212807 [Multi-domain] Cd Length: 53 Bit Score: 39.24 E-value: 6.23e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWqgelqaRGKKRQK-GWFPASHVKL 1102
Cdd:cd11874     2 CKVLFSYTPQNEDELELKVGDTIEVLGEVEEGWW------EGKLNGKvGVFPSNFVKE 53

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 39.42 E-value: 6.33e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1044 EIAQVTSAYAASGTEQLSLAPGQLILILKKNT--SGWWQGELQARgkkrqKGWFP 1096
Cdd:cd12056     2 EYCKALFHYEGTNEDELDFKEGEIILIISKDTgePGWWKGELNGK-----EGVFP 51

Second Src Homology 3 domain of Nck2 adaptor protein; Nck2 (also called Nckbeta or Growth factor receptor-bound protein 4, Grb4) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds neuronal signaling proteins such as ephrinB and Disabled-1 (Dab-1) exclusively. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The second SH3 domain of Nck appears to prefer ligands containing the APxxPxR motif. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212835 [Multi-domain] Cd Length: 55 Bit Score: 39.22 E-value: 6.65e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401  978 YSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGSIGERTGIFPSNYV 1022
Cdd:cd11902     7 FAYVAEREDELSLVKGSRVTVMEKcsDG-WWRGSYNGQIGWFPSNYV 52

Src Homology 3 domain of Cdc42-Interacting Protein 4; This subfamily is composed of Cdc42-Interacting Protein 4 (CIP4), Formin Binding Protein 17 (FBP17), FormiN Binding Protein 1-Like (FNBP1L), and similar proteins. CIP4 and FNBP1L are Cdc42 effectors that bind Wiskott-Aldrich syndrome protein (WASP) and function in endocytosis. CIP4 and FBP17 bind to the Fas ligand and may be implicated in the inflammatory response. CIP4 may also play a role in phagocytosis. It functions downstream of Cdc42 in PDGF-dependent actin reorganization and cell migration, and also regulates the activity of PDGFRbeta. It uses Src as a substrate in regulating the invasiveness of breast tumor cells. CIP4 may also play a role in the pathogenesis of Huntington's disease. Members of this subfamily typically contain an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs) domain, a central Cdc42-binding HR1 domain, and a C-terminal SH3 domain. The SH3 domain of CIP4 associates with Gapex-5, a Rab31 GEF. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212844 [Multi-domain] Cd Length: 55 Bit Score: 39.17 E-value: 6.70e-04

                          10        20        30
                  ....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGW 784
Cdd:cd11911     3 TALYDFDGTSEGTLSMEEGEILLVLEEDGGD-GW 35

C2 domain (first repeat) of Ras GTPase activating proteins (GAPs); RasGAPs suppress Ras function by enhancing the GTPase activity of Ras proteins resulting in the inactive GDP-bound form of Ras. In this way it can control cellular proliferation and differentiation. The proteins here all contain either a single C2 domain or two tandem C2 domains, a Ras-GAP domain, and a pleckstrin homology (PH)-like domain. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. Members here have a type-I topology.

Pssm-ID: 176029 [Multi-domain] Cd Length: 117 Bit Score: 41.10 E-value: 6.78e-04

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1559 LMVHVIEATELKackPNGKSNPYCEVSMGS-QSYTTRTLQDtLNPKWNFncQFFIKDLYQDV----LCLTMFDRDQFSPD 1633
Cdd:cd08383     2 LRLRILEAKNLP---SKGTRDPYCTVSLDQvEVARTKTVEK-LNPFWGE--EFVFDDPPPDVtfftLSFYNKDKRSKDRD 75

                          90       100       110
                  ....*....|....*....|....*....|....*...
gi 312176401 1634 DFLGRTEvpvakIRTEQESKGPTTRRLLLHEVPTGEVW 1671
Cdd:cd08383    76 IVIGKVA-----LSKLDLGQGKDEWFPLTPVDPDSEVQ 108

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The N-terminal SH3 domain of GRB2 binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212738 [Multi-domain] Cd Length: 52 Bit Score: 39.26 E-value: 6.86e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGE--EILVTQKDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11804     3 VAKHDFKATAEDELSFKKGSilKVLNMEDDPNWYKAELDGKEGLIPKNYI 52

Src Homology 3 domain of Apoptosis Stimulating of p53 protein 1; ASPP1, like ASPP2, activates the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73). In addition, it functions in the cytoplasm to regulate the nuclear localization of the transcriptional cofactors YAP and TAZ by inihibiting their phosphorylation; YAP and TAZ are important regulators of cell expansion, differentiation, migration, and invasion. ASPP1 is downregulated in breast tumors expressing wild-type p53. It contains a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain at its C-terminal half. The SH3 domain and the ANK repeats of ASPP1 contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212887 [Multi-domain] Cd Length: 57 Bit Score: 39.23 E-value: 6.93e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCN 799
Cdd:cd11954     5 ALWDYEAQNADELSFQEGDAITIlRRKDDSETEWWWARLNDKEGYVPKN 53

N-terminal Src homology 3 domain of Growth factor receptor-bound protein 2; GRB2 is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. It is ubiquitously expressed in all tissues throughout development and is important in cell cycle progression, motility, morphogenesis, and angiogenesis. In lymphocytes, GRB2 is associated with antigen receptor signaling components. GRB2 contains an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. Its N-terminal SH3 domain binds to Sos and Sos-derived proline-rich peptides. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212879 [Multi-domain] Cd Length: 56 Bit Score: 39.24 E-value: 7.00e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQV-DEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11946     5 AKYDFKATADDELSFKRGDILKVlNEEC--DQNWYKAELNGKDGFIPKNYIE 54

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 39.21 E-value: 7.04e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDGEWWTGSIGERT---GIFPSNYVRP 1024
Cdd:cd11925     3 YLALYAYKPQKNDELELRKGEMYRVIEKCQDGWFKGTSLRTgvsGVFPGNYVTP 56

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 39.28 E-value: 7.28e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11974     5 ALWDHVTMDDQELAFKAGDVIRVLEaSNKDWWWGRNEDREAWFPASFVR 53

Second Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212856 [Multi-domain] Cd Length: 57 Bit Score: 39.13 E-value: 7.30e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLT--GLFPSNYVKM 1171
Cdd:cd11923     2 EAVAKYNFNADTNVELSLRKGDRVVLLKQVDQNWYEGKIPGTNrqGIFPVSYVEV 56

Src Homology 3 domain of Melanoma Inhibitory Activity protein and similar proteins; MIA is a single domain protein that adopts a SH3 domain-like fold; it contains an additional antiparallel beta sheet and two disulfide bonds compared to classical SH3 domains. MIA is secreted from malignant melanoma cells and it plays an important role in melanoma development and invasion. MIA is expressed by chondrocytes in normal tissues and may be important in the cartilage cell phenotype. Unlike classical SH3 domains, MIA does not bind proline-rich ligands. MIA is a member of the recently identified family that also includes MIA-like (MIAL), MIA2, and MIA3 (also called TANGO); the biological functions of this family are not yet fully understood.

Pssm-ID: 212694 Cd Length: 76 Bit Score: 39.77 E-value: 7.36e-04

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1115 HAVCQVIAMYDYMANNEDELNFSKGQLINVMNK---DDPDWWQGETNG---LTGLFPSNYVK 1170
Cdd:cd11760     9 NPISRARALEDYHGPDCRFLNFKKGDTIYVYSKlagERQDLWAGSVGGdagLFGYFPKNLVQ 70

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing (Stac) proteins; Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. This model represents the first C-terminal SH3 domain of Stac1 and Stac3, and the single C-terminal SH3 domain of Stac2. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212767 [Multi-domain] Cd Length: 53 Bit Score: 39.02 E-value: 7.38e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11833     4 ALYKFKPQENEDLEMRPGDKITLLDdSNEDWWKGKIEDRVGFFPANFV 51

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 38.91 E-value: 7.89e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYV 801
Cdd:cd11806     2 YVAIADFVATDDSQLSFESGDKLLVLRKPSVD--WWWAEHNGCCGYIPASHL 51

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 39.02 E-value: 8.19e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  750 YRALYPFEARNHDEMSFSSGD---IIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12141     2 YYAVYTFKARSPNELSVSANQrvrILEFSDLT-GNKEWWLAEANGQKGYVPSNYIRK 57

Second Src Homology 3 domain of FCH and double SH3 domains protein 2; FCHSD2 has a domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. It has only been characterized in silico and its function is unknown. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212827 Cd Length: 56 Bit Score: 39.15 E-value: 8.28e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILV----TQKDGEWWTGSIGERTGIFPS 1019
Cdd:cd11894     4 ALYDYEGQTDDELSFPEGAIIRIlnkeNQDDDGFWEGEFNGRIGVFPS 51

N-terminal Src Homology 3 domain of Ct10 Regulator of Kinase adaptor proteins; CRK adaptor proteins consists of SH2 and SH3 domains, which bind tyrosine-phosphorylated peptides and proline-rich motifs, respectively. They function downstream of protein tyrosine kinases in many signaling pathways started by various extracellular signals, including growth and differentiation factors. Cellular CRK (c-CRK) contains a single SH2 domain, followed by N-terminal and C-terminal SH3 domains. It is involved in the regulation of many cellular processes including cell growth, motility, adhesion, and apoptosis. CRK has been implicated in the malignancy of various human cancers. The N-terminal SH3 domain of CRK binds a number of target proteins including DOCK180, C3G, SOS, and cABL. The CRK family includes two alternatively spliced protein forms, CRKI and CRKII, that are expressed by the CRK gene, and the CRK-like (CRKL) protein, which is expressed by a distinct gene (CRKL). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212692 [Multi-domain] Cd Length: 55 Bit Score: 38.88 E-value: 8.39e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE-WWTG--SIGeRTGIFPSNYV 1022
Cdd:cd11758     4 RALFDFPGNDDEDLPFKKGEILTVIRKPEEqWWNArnSEG-KTGMIPVPYV 53

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 38.94 E-value: 8.45e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILV--TQKDGeWWTGSIGERTGIFPSNY 1021
Cdd:cd11797     3 VALYRFQALEPNELDFEVGDRIRIiaTLEDG-WLEGELKGRRGIFPHRF 50

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 38.98 E-value: 8.79e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12016     2 KYITTQAYKAENEDEIGFETGVVVEVIQKNLDGWWKIRYQGKEGWAPATYLK 53

Src Homology 3 domain of Cytokinesis protein 3 and similar proteins; Cytokinesis protein 3 (Cyk3 or Cyk3p) is a component of the actomyosin ring independent cytokinesis pathway in yeast. It interacts with Inn1 and facilitates its recruitment to the bud neck, thereby promoting cytokinesis. Cyk3p contains an N-terminal SH3 domain and a C-terminal transglutaminase-like domain. The Cyk3p SH3 domain binds to the C-terminal proline-rich region of Inn1. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212822 Cd Length: 53 Bit Score: 39.02 E-value: 8.83e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLE-QQENWWFGEV--HGGRGWFPKSYV 932
Cdd:cd11889     1 KVKAVYSWAGETEGDLGFLEGDLIEVLSiGDGSWWSGKLrrNGAEGIFPSNFV 53

Third Src homology 3 domain (or SH3C) of Intersectin-2; Intersectin-2 (ITSN2) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN2 also functions as a specific GEF for Cdc42 activation in epithelial morphogenesis, and is required in mitotic spindle orientation. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The third SH3 domain (SH3C) of ITSN2 has been shown to bind the K15 protein of Kaposi's sarcoma-associated herpesvirus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212925 Cd Length: 52 Bit Score: 38.84 E-value: 8.92e-04

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11992     4 ALYPYSSSEPGDLTFNEGEEILVTQKDGEWWTGSIEDRTGIFPSNYVR 51

First Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212852 [Multi-domain] Cd Length: 55 Bit Score: 38.79 E-value: 9.02e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11919     4 RAKFDFKAQTLKELPLQKGDIVyiykQIDQN------WYEGEHHGRVGIFPRSYIE 53

Src Homology 3 domain of fungal BOI-like proteins; This subfamily includes the Saccharomyces cerevisiae proteins BOI1 and BOI2, and similar proteins. They contain an N-terminal SH3 domain, a Sterile alpha motif (SAM), and a Pleckstrin homology (PH) domain at the C-terminus. BOI1 and BOI2 interact with the SH3 domain of Bem1p, a protein involved in bud formation. They promote polarized cell growth and participates in the NoCut signaling pathway, which is involved in the control of cytokinesis. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212819 Cd Length: 55 Bit Score: 38.85 E-value: 9.18e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDP---DWWQGE--TNGLTGLFPSNY 1168
Cdd:cd11886     2 LIVIHDFNARSEDELTLKPGDKIELIEDDEEfgdGWYLGRnlRTGETGLFPVVF 55

Src Homology 3 domain of Sorting nexin 18; SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. It binds FIP5 and is required for apical lumen formation. It may also play a role in axonal elongation. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX18 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212830 [Multi-domain] Cd Length: 55 Bit Score: 38.82 E-value: 9.48e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETN--GLTGLFPSNYVKM 1171
Cdd:cd11897     4 ALYDFRSENPGEISLREHEVLSLCSEQDIEGWLEGVNsrGDRGLFPASYVEV 55

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 39.08 E-value: 9.73e-04

                          10        20
                  ....*....|....*....|....*...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEK 777
Cdd:cd11847     2 YKALWDFKARGDEELSFQAGDQFRIAER 29

C-terminal Src Homology 3 domain of Nebulin; Nebulin is a giant filamentous protein (600-900 kD) that is expressed abundantly in skeletal muscle. It binds to actin thin filaments and regulates its assembly and function. Nebulin was thought to be part of a molecular ruler complex that is critical in determining the lengths of actin thin filaments in skeletal muscle since its length, which varies due to alternative splicing, correlates with the length of thin filaments in various muscle types. Recent studies indicate that nebulin regulates thin filament length by stabilizing the filaments and preventing depolymerization. Mutations in nebulin can cause nemaline myopathy, characterized by muscle weakness which can be severe and can lead to neonatal lethality. Nebulin contains an N-terminal LIM domain, many nebulin repeats/super repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212866 [Multi-domain] Cd Length: 58 Bit Score: 38.84 E-value: 9.73e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  971 GEDYIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGE--RTGIFPSNYV 1022
Cdd:cd11933     1 GKSFRAMYDYRAADDDEVSFKDGDTIVNVQTiDEGWMYGTVQRtgKTGMLPANYV 55

Src Homology 3 domain of Sorting Nexin 33; SNX33 interacts with Wiskott-Aldrich syndrome protein (WASP) and plays a role in the maintenance of cell shape and cell cycle progression. It modulates the shedding and endocytosis of cellular prion protein (PrP(c)) and amyloid precursor protein (APP). SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX33 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212829 [Multi-domain] Cd Length: 55 Bit Score: 38.79 E-value: 9.77e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPD-WWQGE-TNGLTGLFPSNYVKM 1171
Cdd:cd11896     4 ALYSFQSENKEEINIQENEELVIFSENSLDgWLQGQnSRGETGLFPASYVEI 55

Src homology 3 domain of Src Protein Tyrosine Kinase; Src (or c-Src) is a cytoplasmic (or non-receptor) PTK and is the vertebrate homolog of the oncogenic protein (v-Src) from Rous sarcoma virus. Together with other Src subfamily proteins, it is involved in signaling pathways that regulate cytokine and growth factor responses, cytoskeleton dynamics, cell proliferation, survival, and differentiation. Src also play a role in regulating cell adhesion, invasion, and motility in cancer cells, and tumor vasculature, contributing to cancer progression and metastasis. Elevated levels of Src kinase activity have been reported in a variety of human cancers. Several inhibitors of Src have been developed as anti-cancer drugs. Src is also implicated in acute inflammatory responses and osteoclast function. Src kinases contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr. They are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212941 [Multi-domain] Cd Length: 56 Bit Score: 38.94 E-value: 9.77e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpGWLYGSFQ-GKFGWFPCNYV 801
Cdd:cd12008     2 FVALYDYESRTETDLSFKKGERLQIVNNTEGD-WWLAHSLTtGQTGYIPSNYV 53

Second Src Homology 3 domain of Bzz1 and similar domains; Bzz1 (or Bzz1p) is a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Together with other proteins, it induces membrane scission in yeast. Bzz1 contains an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), a central coiled-coil, and two C-terminal SH3 domains. This model represents the second C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212712 [Multi-domain] Cd Length: 51 Bit Score: 38.63 E-value: 9.83e-04

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN--WWFGEVHGGRGWFPKSY 931
Cdd:cd11778     1 YVEALYDYEAQGDDEISIRVGDRIAVIRGDDGsgWTYGEINGVKGLFPTSY 51

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 38.82 E-value: 1.00e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1051 AYAASGTEQLSLAPGQLILILKKNTSGWWQGELqargkKRQKGWFPASHV 1100
Cdd:cd11772     7 DYEAQHPDELSFEEGDLLYISDKSDPNWWKATC-----GGKTGLIPSNYV 51

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 39.02 E-value: 1.01e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQE-----NWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12141     4 AVYTFKARSPNELSVSANQRVRILEFSDltgnkEWWLAEANGQKGYVPSNYIR 56

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Embryonal Fyn-associated Substrate; EFS is also called HEFS, CASS3 (Cas scaffolding protein family member 3) or SIN (Src-interacting protein). It was identified based on interactions with the Src kinases, Fyn and Yes. It plays a role in thymocyte development and acts as a negative regulator of T cell proliferation. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212936 Cd Length: 62 Bit Score: 39.10 E-value: 1.01e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE----WWTGSIGERTGIFPSNYVR 1023
Cdd:cd12003     5 ALYDNAAESPEELSFRRGDVLMVLKREHGslpgWWLCSLHGQQGIAPANRLR 56

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 38.63 E-value: 1.01e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd11869     4 ALFDFTGNSKLELNFKAGDVIfLLSRVNKDWLEGTVRGATGIFPLSFVK 52

Src Homology 3 domain of C-terminal Src kinase; CSK is a cytoplasmic (or nonreceptor) tyr kinase containing the Src homology domains, SH3 and SH2, N-terminal to the catalytic tyr kinase domain. They negatively regulate the activity of Src kinases that are anchored to the plasma membrane. To inhibit Src kinases, CSK is translocated to the membrane via binding to specific transmembrane proteins, G-proteins, or adaptor proteins near the membrane. CSK catalyzes the tyr phosphorylation of the regulatory C-terminal tail of Src kinases, resulting in their inactivation. It is expressed in a wide variety of tissues and plays a role, as a regulator of Src, in cell proliferation, survival, and differentiation, and consequently, in cancer development and progression. In addition, CSK also shows Src-independent functions. It is a critical component in G-protein signaling, and plays a role in cytoskeletal reorganization and cell migration. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212703 [Multi-domain] Cd Length: 57 Bit Score: 38.82 E-value: 1.02e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  971 GEDYIALYSYSSVEPGDLTFTEGEEILVTQ--KDGEWWTG--SIGeRTGIFPSNYV 1022
Cdd:cd11769     1 GTECIAKYNFNGASEEDLPFKKGDILTIVAvtKDPNWYKAknKDG-REGMIPANYV 55

C-terminal Src Homology 3 domain of the p67phox subunit of NADPH oxidase and similar proteins; This subfamily is composed of p67phox, NADPH oxidase activator 1 (Noxa1), and similar proteins. p67phox, also called Neutrophil cytosol factor 2 (NCF-2), and Noxa1 are homologs and are the cytosolic subunits of the phagocytic (Nox2) and nonphagocytic (Nox1) NADPH oxidase complexes, respectively. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox and Noxa1 play regulatory roles. p67phox contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. Noxa1 has a similar domain architecture except it is lacking the N-terminal SH3 domain. The TPR domain of both binds activated GTP-bound Rac, while the C-terminal SH3 domain of p67phox and Noxa1 binds the polyproline motif found at the C-terminus of p47phox and Noxo1, respectively. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212803 [Multi-domain] Cd Length: 53 Bit Score: 38.66 E-value: 1.03e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11870     1 QVVALHRYEAQGPEDLGFREGDTIDVLSEvNEAWLEGHSDGRVGIFPKCFVV 52

Src homology 3 domain of ephexin-1-like SH3 domain containing Rho guanine nucleotide exchange factors; Members of this family contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and C-terminal SH3 domains. They include the Rho guanine nucleotide exchange factors ARHGEF5, ARHGEF16, ARHGEF19, ARHGEF26, ARHGEF27 (also called ephexin-1), and similar proteins, and are also called ephexins because they interact directly with ephrin A receptors. GEFs interact with Rho GTPases via their DH domains to catalyze nucleotide exchange by stabilizing the nucleotide-free GTPase intermediate. They play important roles in neuronal development. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212727 [Multi-domain] Cd Length: 55 Bit Score: 38.86 E-value: 1.04e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQ-ENWWFGE--VHGGRGWFPKSYV 932
Cdd:cd11793     2 VQCVHAYTAQQPDELTLEEGDVVNVLRKMpDGWYEGErlRDGERGWFPSSYT 53

Src homology 3 domain of SH3 and multiple ankyrin repeat domains protein 3; Shank3, also called ProSAP2 (Proline-rich synapse-associated protein 2), is widely expressed. It plays a role in the formation of dendritic spines and synapses. Haploinsufficiency of the Shank3 gene causes the 22q13 deletion/Phelan-McDermid syndrome, and variants of Shank3 have been implicated in autism spectrum disorder, schizophrenia, and intellectual disability. Shank proteins carry scaffolding functions through multiple sites of protein-protein interaction in its domain architecture, including ankyrin (ANK) repeats, a long proline rich region, as well as SH3, PDZ, and SAM domains. The SH3 domain of Shank binds GRIP, a scaffold protein that binds AMPA receptors and Eph receptors/ligands. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212917 Cd Length: 52 Bit Score: 38.78 E-value: 1.05e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQ-KDGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11984     3 FIAVKAYSPQGEGEIQLNRGERVKVLSiGEGGFWEGTVKGRTGWFPADCV 52

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 38.57 E-value: 1.05e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd11866     2 YMGLWDCSGNEPDELSFKRGDLIYIISKEYDSFGWWVGELNGKVGLVPKDYL 53

Src Homology 3 domain of the p85 regulatory subunit of Class IA Phosphatidylinositol 3-kinases; Class I PI3Ks convert PtdIns(4,5)P2 to the critical second messenger PtdIns(3,4,5)P3. They are heterodimers and exist in multiple isoforms consisting of one catalytic subunit (out of four isoforms) and one of several regulatory subunits. Class IA PI3Ks associate with the p85 regulatory subunit family, which contains SH3, RhoGAP, and SH2 domains. The p85 subunits recruit the PI3K p110 catalytic subunit to the membrane, where p110 phosphorylates inositol lipids. Vertebrates harbor two p85 isoforms, called alpha and beta. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212710 Cd Length: 72 Bit Score: 39.41 E-value: 1.05e-03

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  748 VNYRALYPFEARNHDEMSFSSGDIIQVD------------EKTVGEP-GWLYGSFQ--GKFGWFPCNYVE 802
Cdd:cd11776     1 VQYRALYDYEKERDEDIILKTGDVLVVEnpellalgvpdgKETVPKPeGWLEGKNErtGERGDFPGTYVE 70

Third Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212718 Cd Length: 55 Bit Score: 38.60 E-value: 1.06e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYV 801
Cdd:cd11784     2 CVALHSYSAHRPEELELQKGEGVRVLGKF--QEGWLRGLslVTGRVGIFPSNYV 53

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 38.62 E-value: 1.09e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1047 QVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGelqARGKKRQKGWFPASHVKL 1102
Cdd:cd11940     3 QCIRSYKAQENDELTLEKADIIMVRQQSSDGWLEG---VRLSDGERGWFPQSHVEE 55

Uncharacterized conserved protein, contains a C-terminal ATPase domain [Function unknown];

Pssm-ID: 443941 [Multi-domain] Cd Length: 1089 Bit Score: 43.75 E-value: 1.14e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  382 RRQVLMEQQQREAERKAQKEKEEWERKQRELQEQE--------WKKQLELEkrlekqrelerqreeerrkeierreAAKQ 453
Cdd:COG4913   241 HEALEDAREQIELLEPIRELAERYAAARERLAELEylraalrlWFAQRRLE-------------------------LLEA 295

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  454 ELERqrrlewerlrrqeLLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRlqdvqiRKQTQKTELEVLDKqcdl 533
Cdd:COG4913   296 ELEE-------------LRAELARLEAELERLEARLDALREELDELEAQIRGNGGD------RLEQLEREIERLER---- 352

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  534 eimEIKQLQQELKEYQNKLIYL---VP--EKQLLNERIKNMQLSNTPDSGISLLHKKSSEKEELCQRLKEQLDALEKETA 608
Cdd:COG4913   353 ---ELEERERRRARLEALLAALglpLPasAEEFAALRAEAAALLEALEEELEALEEALAEAEAALRDLRRELRELEAEIA 429


                  .
gi 312176401  609 S 609
Cdd:COG4913   430 S 430

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 43.89 E-value: 1.14e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   348 YQKTQEEEPQKKLPVTFEDKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKkqlELEKRL 427
Cdd:TIGR02168  708 EELEEELEQLRKELEELSRQISALRKDLARLEAEVEQLEERIAQLSKELTELEAEIEELEERLEEAEEELA---EAEAEI 784

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   428 EKQRELERQREEERRKEIERREAAKQELER-QRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQ- 505
Cdd:TIGR02168  785 EELEAQIEQLKEELKALREALDELRAELTLlNEEAANLRERLESLERRIAATERRLEDLEEQIEELSEDIESLAAEIEEl 864

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   506 ------ISGRLQDVQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLiylvpekQLLNERIKNMQLsntpdsgi 579
Cdd:TIGR02168  865 eelieeLESELEALLNERASLEEALALLRSELEELSEELRELESKRSELRREL-------EELREKLAQLEL-------- 929

                          250       260
                   ....*....|....*....|....
gi 312176401   580 sllhkkssEKEELCQRLKEQLDAL 603
Cdd:TIGR02168  930 --------RLEGLEVRIDNLQERL 945

DNA double-strand break repair Rad50 ATPase;

Pssm-ID: 179385 [Multi-domain] Cd Length: 880 Bit Score: 43.88 E-value: 1.15e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  365 EDKRKANYERGNME--LEKRRQVLMEQQQREAE-RKAQKEKEEWERKQRELQE--QEWKKQLElekRLEKQRELERQREE 439
Cdd:PRK02224  227 EQREQARETRDEADevLEEHEERREELETLEAEiEDLRETIAETEREREELAEevRDLRERLE---ELEEERDDLLAEAG 303

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  440 ERRKEIERREAAKQELERQRRL-----EWERLRRQELLSQKTREQEDIVRLSSRKKSLH-----LELEAVNGKHQQISGR 509
Cdd:PRK02224  304 LDDADAEAVEARREELEDRDEElrdrlEECRVAAQAHNEEAESLREDADDLEERAEELReeaaeLESELEEAREAVEDRR 383

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  510 LQDVQIRKQTQKTELEVLDKQCDLEIME--IKQLQQELKEYQNKLIYLVPEKQLLNERI-KNMQL---SNTPDSGISL-- 581
Cdd:PRK02224  384 EEIEELEEEIEELRERFGDAPVDLGNAEdfLEELREERDELREREAELEATLRTARERVeEAEALleaGKCPECGQPVeg 463

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  582 ------LHKKSSEKEELCQRL---KEQLDALEK--ETASKLSEMDSFNNQLKcgsmddcvlqcllsllSCLNNLFLLLKE 650
Cdd:PRK02224  464 sphvetIEEDRERVEELEAELedlEEEVEEVEErlERAEDLVEAEDRIERLE----------------ERREDLEELIAE 527

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  651 LRESYNTQQLALEQLHKIKRDKLKEIERKRlEQIQKKKLEDEAARKA------KQGKENLWRESIRK---------EEEE 715
Cdd:PRK02224  528 RRETIEEKRERAEELRERAAELEAEAEEKR-EAAAEAEEEAEEAREEvaelnsKLAELKERIESLERirtllaaiaDAED 606

                         410       420
                  ....*....|....*....|
gi 312176401  716 KQKRLQEEKSQDKTQEEERK 735
Cdd:PRK02224  607 EIERLREKREALAELNDERR 626

First Src Homology 3 domain of Vinexin, also called Sorbin and SH3 domain containing 3 (Sorbs3); Vinexin is also called Sorbs3, SH3P3, and SH3-containing adapter molecule 1 (SCAM-1). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. Vinexin was first identified as a vinculin binding protein; it is co-localized with vinculin at cell-ECM and cell-cell adhesion sites. There are several splice variants of vinexin: alpha, which contains the SoHo and three SH3 domains and displays tissue-specific expression; and beta, which contains only the three SH3 domains and is widely expressed. Vinexin alpha stimulates the accumulation of F-actin at focal contact sites. Vinexin also promotes keratinocyte migration and wound healing. The SH3 domains of vinexin have been reported to bind a number of ligands including vinculin, WAVE2, DLG5, Abl, and Cbl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212854 Cd Length: 55 Bit Score: 38.75 E-value: 1.17e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11921     4 RLKFDFQAQSPKELTLQKGDIVYIHKEV--DKNWLEGEHHGRVGIFPANYVE 53

DNA double-strand break repair ATPase Rad50;

Pssm-ID: 235175 [Multi-domain] Cd Length: 880 Bit Score: 43.90 E-value: 1.18e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  383 RQVLMEQQQREAERKAQKEKEEWERKQREL-----QEQEWKKQL-----ELEKRLEKQRElerqreeerrkeierreaaK 452
Cdd:PRK03918  152 RQILGLDDYENAYKNLGEVIKEIKRRIERLekfikRTENIEELIkekekELEEVLREINE-------------------I 212

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  453 QELERQrrlewerlrRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCD 532
Cdd:PRK03918  213 SSELPE---------LREELEKLEKEVKELEELKEEIEELEKELESLEGSKRKLEEKIRELEERIEELKKEIEELEEKVK 283

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  533 lEIMEIK-------QLQQELKEYQNKLIYLVPEKQLLNERIKNMQlsntpdSGISLLHKKSSEKEELCQRLKEQLDALEK 605
Cdd:PRK03918  284 -ELKELKekaeeyiKLSEFYEEYLDELREIEKRLSRLEEEINGIE------ERIKELEEKEERLEELKKKLKELEKRLEE 356

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  606 ---------ETASKLSEMDSFNNQLKCGSMDDCVLQCLLSLLSCLNNLFLLLK------ELRESYNTQQLALEQLHKIKR 670
Cdd:PRK03918  357 leerhelyeEAKAKKEELERLKKRLTGLTPEKLEKELEELEKAKEEIEEEISKitarigELKKEIKELKKAIEELKKAKG 436

                         330       340       350       360       370       380       390       400
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  671 D------KLKEIERKRLEQIQKKKLEDEAARKAKQGKEnlwRESIRKEEEEKQKRLQEEK---SQDKTQEEERKAEAKQS 741
Cdd:PRK03918  437 KcpvcgrELTEEHRKELLEEYTAELKRIEKELKEIEEK---ERKLRKELRELEKVLKKESeliKLKELAEQLKELEEKLK 513


                  .
gi 312176401  742 E 742
Cdd:PRK03918  514 K 514

Third Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212750 [Multi-domain] Cd Length: 51 Bit Score: 38.54 E-value: 1.23e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYV 932
Cdd:cd11816     1 RCVARFDFEGEQEDELSFSEGDVITLKEYvGEEWAKGELNGKIGIFPLNFV 51

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 38.62 E-value: 1.26e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  756 FEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGS--FQGKFGWFPCNYVE 802
Cdd:cd11940     8 YKAQENDELTLEKADIIMVRQQS--SDGWLEGVrlSDGERGWFPQSHVE 54

Src Homology 3 domain of Sorting Nexin 9 and similar proteins; Sorting nexins (SNXs) are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNXs differ from each other in their lipid-binding specificity, subcellular localization and specific function in the endocytic pathway. This subfamily consists of SH3 domain containing SNXs including SNX9, SNX18, SNX33, and similar proteins. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis, while SNX18 is localized to peripheral endosomal structures, and acts in a trafficking pathway that is clathrin-independent but relies on AP-1 and PACS1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212697 [Multi-domain] Cd Length: 55 Bit Score: 38.46 E-value: 1.30e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNT-SGWWQGElQARGKkrqKGWFPASHV 1100
Cdd:cd11763     8 FDSQPSGELSLRAGEVLTITRQDVgDGWLEGR-NSRGE---VGLFPSSYV 53

60S ribosomal protein L19-like protein; Provisional

Pssm-ID: 185616 [Multi-domain] Cd Length: 357 Bit Score: 43.01 E-value: 1.37e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  646 LLLKELRESYNTQQLALEQLHKIKRDKLKEieRKRLEQIQKKKLEDEAARKAKQGKEnlwresIRKEEEEKQKRLQEEKS 725
Cdd:PTZ00436  123 LYVKAKGNVFRNKRNLMEHIHKVKNEKKKE--RQLAEQLAAKRLKDEQHRHKARKQE------LRKREKDRERARREDAA 194

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  726 qdKTQEEERKAEAKQSETASALVNYRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPcnyvekvl 805
Cdd:PTZ00436  195 --AAAAAKQKAAAKKAAAPSGKKSAKAAAPAKAAAAPAKAAAPPAKAAAAPAKAAAAPAKAAAPPAKAAAPP-------- 264

                         170       180       190
                  ....*....|....*....|....*....|
gi 312176401  806 sSEKALSPKKALLPPTVSLSATSTSSQPPA 835
Cdd:PTZ00436  265 -AKAAAPPAKAAAPPAKAAAPPAKAAAPPA 293

Src Homology 3 domain of metazoan osteoclast stimulating factor 1; OSTF1, also named OSF or SH3P2, is a signaling protein containing SH3 and ankyrin-repeat domains. It acts through a Src-related pathway to enhance the formation of osteoclasts and bone resorption. It also acts as a negative regulator of cell motility. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212706 [Multi-domain] Cd Length: 53 Bit Score: 38.44 E-value: 1.39e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVLEQQE-NWWFGEVHGGRGWFPKSYV 932
Cdd:cd11772     4 ALYDYEAQHPDELSFEEGDLLYISDKSDpNWWKATCGGKTGLIPSNYV 51

Src homology 3 domain of APC-Stimulated guanine nucleotide Exchange Factor 2; ASEF2, also called Spermatogenesis-associated protein 13 (SPATA13), is a GEF that localizes with actin at the leading edge of cells and is important in cell migration and adhesion dynamics. GEFs activate small GTPases by exchanging bound GDP for free GTP. ASEF2 can activate both Rac 1 and Cdc42, but only Rac1 activation is necessary for increased cell migration and adhesion turnover. Together with APC (adenomatous polyposis coli) and Neurabin2, a scaffold protein that binds F-actin, it is involved in regulating HGF-induced cell migration. ASEF2 contains a SH3 domain followed by RhoGEF (also called Dbl-homologous or DH) and Pleckstrin Homology (PH) domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212907 Cd Length: 54 Bit Score: 38.51 E-value: 1.45e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401 1058 EQLSLAPGQLILILKKNTSGWWQGelqaRGKKRQkGWFPASHVKL 1102
Cdd:cd11974    15 QELAFKAGDVIRVLEASNKDWWWG----RNEDRE-AWFPASFVRL 54

Src homology 3 domain of Slit-Robo GTPase Activating Proteins; Slit-Robo GTPase Activating Proteins (srGAPs) are Rho GAPs that interact with Robo1, the transmembrane receptor of Slit proteins. Slit proteins are secreted proteins that control axon guidance and the migration of neurons and leukocytes. Vertebrates contain three isoforms of srGAPs (srGAP1-3), all of which are expressed during embryonic and early development in the nervous system but with different localization and timing. A fourth member has also been reported (srGAP4, also called ARHGAP4). srGAPs contain an N-terminal F-BAR domain, a Rho GAP domain, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212743 [Multi-domain] Cd Length: 53 Bit Score: 38.15 E-value: 1.46e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVKL 934
Cdd:cd11809     2 ATAQFDYTGRSERELSFKKGDSLTLYRQVSDdWWRGQLNGQDGLVPHKYITL 53

Predicted nucleic acid-binding protein DR0291, contains C4-type Zn-ribbon domain [General function prediction only];

Pssm-ID: 441187 [Multi-domain] Cd Length: 236 Bit Score: 42.22 E-value: 1.48e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  648 LKELRESYNTQQLALEQL-HKIKRDK---------------LKEIE--RKRLEQIQKKKLE----DEAARKAKQGKENLw 705
Cdd:COG1579    54 LEDLEKEIKRLELEIEEVeARIKKYEeqlgnvrnnkeyealQKEIEslKRRISDLEDEILElmerIEELEEELAELEAE- 132

                          90       100       110
                  ....*....|....*....|....*....|....*
gi 312176401  706 RESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQ 740
Cdd:COG1579   133 LAELEAELEEKKAELDEELAELEAELEELEAEREE 167

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 2 (Sorbs2), also called Arg-binding protein 2 (ArgBP2); Sorbs2 or ArgBP2 is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It regulates actin-dependent processes including cell adhesion, morphology, and migration. It is expressed in many tissues and is abundant in the heart. Like vinexin, it is found in focal adhesion where it interacts with vinculin and afadin. It also localizes in epithelial cell stress fibers and in cardiac muscle cell Z-discs. Sorbs2 has been implicated to play roles in the signaling of c-Arg, Akt, and Pyk2. Other interaction partners of Sorbs2 include c-Abl, flotillin, spectrin, dynamin 1/2, synaptojanin, PTP-PEST, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212850 [Multi-domain] Cd Length: 61 Bit Score: 38.44 E-value: 1.51e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  971 GEDYIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSiGERT---GIFPSNYVR 1023
Cdd:cd11917     4 GEPFQALYNYMPRNEDELELREGDVIDVMEKcDDGWFVGT-SRRTkffGTFPGNYVK 59

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 40.79 E-value: 1.56e-03

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401   675 EIERKRLEQIQKKKLEDEAAR----KAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEA--KQSETASA 746
Cdd:pfam05672   31 EQERLEKEEEERLRKEELRRRaeeeRARREEEARRLEEERRREEEERQRKAEEEAEEREQREQEEQERlqKQKEEAEA 108

First or N-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the first SH3 domain (or N-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212954 [Multi-domain] Cd Length: 53 Bit Score: 38.01 E-value: 1.65e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGEVHGGRGWFPKSYVK 933
Cdd:cd12021     3 RAIADYEKSSKSEMALKTGDVVEVVEKSENgWWFCQLKAKRGWVPASYLE 52

Src homology 3 domain of RUN and SH3 domain-containing protein 1; RUSC1, also called NESCA (New molecule containing SH3 at the carboxy-terminus), is highly expressed in the brain and is translocated to the nuclear membrane from the cytoplasm upon stimulation with neurotrophin. It plays a role in facilitating neurotrophin-dependent neurite outgrowth. It also interacts with NEMO (or IKKgamma) and may function in NEMO-mediated activation of NF-kB. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212891 [Multi-domain] Cd Length: 51 Bit Score: 37.89 E-value: 1.66e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1120 VIAMYDYMANnEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11958     2 VRALCDHAGS-ESQLSFRKGEELQVLGTVDEDWIRCRRGDREGLVPVGY 49

Third Src Homology 3 domain of SH3 domain containing ring finger 1, an E3 ubiquitin-protein ligase; SH3RF1 is also called POSH (Plenty of SH3s) or SH3MD2 (SH3 multiple domains protein 2). It is a scaffold protein that acts as an E3 ubiquitin-protein ligase. It plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF1 also enhances the ubiquitination of ROMK1 potassium channel resulting in its increased endocytosis. It contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212859 [Multi-domain] Cd Length: 55 Bit Score: 38.03 E-value: 1.69e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK--DGeWWTGSI--GERTGIFPSNYVRP 1024
Cdd:cd11926     2 YVAIYPYTPRKEDELELRKGEMFLVFERcqDG-WFKGTSmhTSKIGVFPGNYVAP 55

First Src Homology 3 domain (SH3A) of CD2-associated protein and similar proteins; This subfamily is composed of the first SH3 domain (SH3A) of CD2AP, CIN85 (Cbl-interacting protein of 85 kDa), and similar domains. CD2AP and CIN85 are adaptor proteins that bind to protein partners and assemble complexes that have been implicated in T cell activation, kidney function, and apoptosis of neuronal cells. They also associate with endocytic proteins, actin cytoskeleton components, and other adaptor proteins involved in receptor tyrosine kinase (RTK) signaling. CD2AP and the main isoform of CIN85 contain three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP and CIN85 to bind various protein partners and assemble complexes that have been implicated in many different functions. SH3A of both proteins bind to an atypical PXXXPR motif at the C-terminus of Cbl and the cytoplasmic domain of the cell adhesion protein CD2. CIN85 SH3A binds to internal proline-rich motifs within the proline-rich region; this intramolecular interaction serves as a regulatory mechanism to keep CIN85 in a closed conformation, preventing the recruitment of other proteins. CIN85 SH3A has also been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212806 [Multi-domain] Cd Length: 53 Bit Score: 38.02 E-value: 1.70e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd11873     8 YDAEEPDELTLKVGDIITNVKKMEEGWWEGTLNGK-----RGMFPDNFVK 52

Third (or C-terminal) Src Homology 3 domain of Sorbin and SH3 domain containing 1 (Sorbs1), also called ponsin; Sorbs1 is also called ponsin, SH3P12, or CAP (c-Cbl associated protein). It is an adaptor protein containing one sorbin homology (SoHo) and three SH3 domains. It binds Cbl and plays a major role in regulating the insulin signaling pathway by enhancing insulin-induced phosphorylation of Cbl. Sorbs1, like vinexin, localizes at cell-ECM and cell-cell adhesion sites where it binds vinculin, paxillin, and afadin. It may function in the control of cell motility. Other interaction partners of Sorbs1 include c-Abl, Sos, flotillin, Grb4, ataxin-7, filamin C, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212849 [Multi-domain] Cd Length: 59 Bit Score: 38.43 E-value: 1.72e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQENWWF-GEVHGGR--GWFPKSYVKLI 935
Cdd:cd11916     5 QALYSYAPQNDDELELRDGDIVDVMEKCDDGWFvGTSRRTKqfGTFPGNYVKLL 58

Src homology 3 domain of Growth Arrest Specific protein 7; GAS7 is mainly expressed in the brain and is required for neurite outgrowth. It may also play a role in the protection and migration of embryonic stem cells. Treatment-related acute myeloid leukemia (AML) has been reported resulting from mixed-lineage leukemia (MLL)-GAS7 translocations as a complication of primary cancer treatment. GAS7 contains an N-terminal SH3 domain, followed by a WW domain, and a central F-BAR domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212763 [Multi-domain] Cd Length: 52 Bit Score: 37.88 E-value: 1.73e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  976 ALYSYSSvEPGD--LTFTEGEEILVTQK-DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11829     4 TLYAFTG-EQHQqgLSFEAGELIRVLQApDGGWWEGEKDGLRGWFPASYV 52

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 40.79 E-value: 1.73e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   349 QKTQEEEPQKKLPVTfEDKRKANYERGNME-----LEKRRQVLMEQQQR----EAERKAQKEKEEWERKQRELQEQEWKK 419
Cdd:pfam05672   32 QERLEKEEEERLRKE-ELRRRAEEERARREeearrLEEERRREEEERQRkaeeEAEEREQREQEEQERLQKQKEEAEAKA 110

                           90
                   ....*....|....*
gi 312176401   420 QLELEK-RLEKQREL 433
Cdd:pfam05672  111 REEAERqRQEREKIM 125

C2 domain first repeat in Ferlin; Ferlins are involved in vesicle fusion events. Ferlins and other proteins, such as Synaptotagmins, are implicated in facilitating the fusion process when cell membranes fuse together. There are six known human Ferlins: Dysferlin (Fer1L1), Otoferlin (Fer1L2), Myoferlin (Fer1L3), Fer1L4, Fer1L5, and Fer1L6. Defects in these genes can lead to a wide range of diseases including muscular dystrophy (dysferlin), deafness (otoferlin), and infertility (fer-1, fertilization factor-1). Structurally they have 6 tandem C2 domains, designated as (C2A-C2F) and a single C-terminal transmembrane domain, though there is a new study that disputes this and claims that there are actually 7 tandem C2 domains with another C2 domain inserted between C2D and C2E. In a subset of them (Dysferlin, Myoferlin, and Fer1) there is an additional conserved domain called DysF. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-II topology.

Pssm-ID: 176019 [Multi-domain] Cd Length: 127 Bit Score: 40.31 E-value: 1.74e-03

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1575 NGKSNPYCEVSMGSQSYTTRTLQDTLNPKWNfncQFFIKDLY-----QDVLCLTMFDRDQFSPDDFLGRTEVP 1642
Cdd:cd08373    12 KGKGDRIAKVTFRGVKKKTRVLENELNPVWN---ETFEWPLAgspdpDESLEIVVKDYEKVGRNRLIGSATVS 81

N-terminal (or first) Src Homology 3 domain of the p67phox subunit of NADPH oxidase; p67phox, also called Neutrophil cytosol factor 2 (NCF-2), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p67phox plays a regulatory role and contains N-terminal TPR, first SH3 (or N-terminal or central SH3), PB1, and C-terminal SH3 domains. It binds, via its C-terminal SH3 domain, to a proline-rich region of p47phox and upon activation, this complex assembles with flavocytochrome b558, the Nox2-p22phox heterodimer. Concurrently, RacGTP translocates to the membrane and interacts with the TPR domain of p67phox, which leads to the activation of NADPH oxidase. The PB1 domain of p67phox binds to its partner PB1 domain in p40phox, and this facilitates the assembly of p47phox-p67phox at the membrane. The N-terminal SH3 domain increases the affinity of p67phox for the oxidase complex. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212804 Cd Length: 54 Bit Score: 37.96 E-value: 1.74e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKtvGEPGWLYGSFQGKFGWFPCNYVEKV 804
Cdd:cd11871     2 HRVLYEFVPETKEELQVLPGNIVFVLKK--GTDNWATVVFNGKKGLVPCNFLEPV 54

Src homology 3 domain of Protein arginine N-methyltransferase 2; PRMT2, also called HRMT1L1, belongs to the arginine methyltransferase protein family. It functions as a coactivator to both estrogen receptor alpha (ER-alpha) and androgen receptor (AR), presumably through arginine methylation. The ER-alpha transcription factor is involved in cell proliferation, differentiation, morphogenesis, and apoptosis, and is also implicated in the development and progression of breast cancer. PRMT2 and its variants are upregulated in breast cancer cells and may be involved in modulating the ER-alpha signaling pathway during formation of breast cancer. PRMT2 also plays a role in regulating the function of E2F transcription factors, which are critical cell cycle regulators, by binding to the retinoblastoma gene product (RB). It contains an N-terminal SH3 domain and an AdoMet binding domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212740 [Multi-domain] Cd Length: 53 Bit Score: 38.14 E-value: 1.75e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQKDG-EWWTGSIGERTGIFPSNYVRP 1024
Cdd:cd11806     2 YVAIADFVATDDSQLSFESGDKLLVLRKPSvDWWWAEHNGCCGYIPASHLHQ 53

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing proteins; ASAPs are Arf GTPase activating proteins (GAPs) and they function in regulating cell growth, migration, and invasion. They contain an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. Vertebrates contain at least three members, ASAP1, ASAP2, and ASAP3, but some ASAP3 proteins do not seem to harbor a C-terminal SH3 domain. ASAP1 and ASAP2 show GTPase activating protein (GAP) activity towards Arf1 and Arf5. They do not show GAP activity towards Arf6, but are able to mediate Arf6 signaling by binding stably to GTP-Arf6. ASAP3 is an Arf6-specific GAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212755 [Multi-domain] Cd Length: 53 Bit Score: 38.06 E-value: 1.76e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|.
gi 312176401 1058 EQLSLAPGQLILILKKNTSGWWQGELQarGKKRQKGWFPAS 1098
Cdd:cd11821    14 DELTFSEGEIIVVTGEEDDEWWEGHIE--GDPSRRGVFPVS 52

Src Homology 3 domain of Bruton's tyrosine kinase; BTK is a cytoplasmic (or nonreceptor) tyr kinase containing Src homology protein interaction domains (SH3, SH2) N-terminal to the catalytic tyr kinase domain. It also contains an N-terminal pleckstrin homology (PH) domain, which binds the products of PI3K and allows membrane recruitment and activation, and the Tec homology (TH) domain with proline-rich and zinc-binding regions. Btk is expressed in B-cells, and a variety of myeloid cells including mast cells, platelets, neutrophils, and dendrictic cells. It interacts with a variety of partners, from cytosolic proteins to nuclear transcription factors, suggesting a diversity of functions. Stimulation of a diverse array of cell surface receptors, including antigen engagement of the B-cell receptor (BCR), leads to PH-mediated membrane translocation of Btk and subsequent phosphorylation by Src kinase and activation. Btk plays an important role in the life cycle of B-cells including their development, differentiation, proliferation, survival, and apoptosis. Mutations in Btk cause the primary immunodeficiency disease, X-linked agammaglobulinaemia (XLA) in humans. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212839 [Multi-domain] Cd Length: 55 Bit Score: 37.88 E-value: 1.83e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEE-ILVTQKDGEWWTGSIGE-RTGIFPSNYV 1022
Cdd:cd11906     4 VALYDYTPMNAQDLQLRKGEEyVILEESNLPWWRARDKNgREGYIPSNYV 53

Src homology 3 domain of Phospholipase C (PLC) gamma 1; PLCgamma1 is widely expressed and is essential in growth and development. It is activated by the TrkA receptor tyrosine kinase and functions as a key regulator of cell differentiation. It is also the predominant PLCgamma in T cells and is required for T cell and NK cell function. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. The SH3 domain of PLCgamma1 directly interacts with dynamin-1 and can serve as a guanine nucleotide exchange factor (GEF). It also interacts with Cbl, inhibiting its phosphorylation and activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212903 Cd Length: 60 Bit Score: 38.05 E-value: 1.86e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGI-FPSNYV 1022
Cdd:cd11970     8 ALFDYKAQREDELTFTKNAIIQnVEKQEGGWWRGDYGGKKQLwFPSNYV 56

Protein of unknown function (DUF3584); This protein is found in bacteria and eukaryotes. Proteins in this family are typically between 943 to 1234 amino acids in length. This family contains a P-loop motif suggesting it is a nucleotide binding protein. It may be involved in replication.

Pssm-ID: 432349 [Multi-domain] Cd Length: 1191 Bit Score: 43.29 E-value: 1.90e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   345 LPSYQkTQEEEPQKKLPVtFEDK-----RKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWERKQRELQEQEWKK 419
Cdd:pfam12128  349 LPSWQ-SELENLEERLKA-LTGKhqdvtAKYNRRRSKIKEQNNRDIAGIKDKLAKIREARDRQLAVAEDDLQALESELRE 426

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   420 QLELEKR-LEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQEDivrlssrkksLHLELEA 498
Cdd:pfam12128  427 QLEAGKLeFNEEEYRLKSRLGELKLRLNQATATPELLLQLENFDERIERAREEQEAANAEVER----------LQSELRQ 496

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   499 VNGKHQQISGRLQDVQIRKQTQKTELEVLDKQCDLEIME-IKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQLSNTPDS 577
Cdd:pfam12128  497 ARKRRDQASEALRQASRRLEERQSALDELELQLFPQAGTlLHFLRKEAPDWEQSIGKVISPELLHRTDLDPEVWDGSVGG 576

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   578 GISL----LHKKSSEKEE---LCQRLKEQLDALEKEtasklsemdsfnnqlkcgsmddcvlqcllsllsclnnlfllLKE 650
Cdd:pfam12128  577 ELNLygvkLDLKRIDVPEwaaSEEELRERLDKAEEA-----------------------------------------LQS 615

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   651 LRESYNTQQLALEQLhkikrdklkeieRKRLEQIQKKklEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQ 730
Cdd:pfam12128  616 AREKQAAAEEQLVQA------------NGELEKASRE--ETFARTALKNARLDLRRLFDEKQSEKDKKNKALAERKDSAN 681

                          410
                   ....*....|
gi 312176401   731 EEERKAEAKQ 740
Cdd:pfam12128  682 ERLNSLEAQL 691

Src homology 3 domain of Apoptosis Stimulating of p53 proteins (ASPP); The ASPP family of proteins bind to important regulators of apoptosis (p53, Bcl-2, and RelA) and cell growth (APCL, PP1). They share similarity at their C-termini, where they harbor a proline-rich region, four ankyrin (ANK) repeats, and an SH3 domain. Vertebrates contain three members of the family: ASPP1, ASPP2, and iASPP. ASPP1 and ASPP2 activate the apoptotic function of the p53 family of tumor suppressors (p53, p63, and p73), while iASPP is an oncoprotein that specifically inhibits p53-induced apoptosis. The expression of ASPP proteins is altered in tumors; ASPP1 and ASPP2 are downregulated whereas iASPP is upregulated is some cancer types. ASPP proteins also bind and regulate protein phosphatase 1 (PP1), and this binding is competitive with p53 binding. The SH3 domain and the ANK repeats of ASPP contribute to the p53 binding site; they bind to the DNA binding domain of p53. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212741 [Multi-domain] Cd Length: 57 Bit Score: 38.13 E-value: 1.92e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  752 ALYPFEARNHDEMSFSSGDIIQV----DEKtvgEPGWLYGSFQGKFGWFPCNY 800
Cdd:cd11807     5 ALFDYEAENGDELSFREGDELTVlrkgDDD---ETEWWWARLNDKEGYVPRNL 54

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 37.83 E-value: 1.93e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401 1126 YMANNEDELNFSKGQLINVMNKDDPDWWQG--ETNGLTGLFPSNYVK 1170
Cdd:cd11785     8 YPPQSEAELELKEGDIVFVHKKREDGWFKGtlQRTGKTGLFPGSFVE 54

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 37.78 E-value: 1.97e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1048 VTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQargkkRQKGWFPASH 1099
Cdd:cd12015     4 VVADYKKQQPNEISLRAGDVVDVIEKNENGWWFVSLE-----DEQGWVPATY 50

First C-terminal Src homology 3 domain of SH3 and cysteine-rich domain-containing protein 3 (Stac3); Stac proteins are putative adaptor proteins that contain a cysteine-rich C1 domain and one or two SH3 domains at the C-terminus. There are three mammalian members (Stac1, Stac2, and Stac3) of this family. Stac1 and Stac3 contain two SH3 domains while Stac2 contains a single SH3 domain at the C-terminus. Stac1 and Stac2 have been found to be expressed differently in mature dorsal root ganglia (DRG) neurons. Stac1 is mainly expressed in peptidergic neurons while Stac2 is found in a subset of nonpeptidergic and all trkB+ neurons. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212919 [Multi-domain] Cd Length: 53 Bit Score: 37.97 E-value: 2.01e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYV 801
Cdd:cd11986     2 FVALYRFKALEKDDLDFHPGERITVIDDSNEE--WWRGKIGEKTGYFPMNFI 51

Src homology 3 domain of Phospholipase C (PLC) gamma 2; PLCgamma2 is primarily expressed in haematopoietic cells, specifically in B cells. It is activated by tyrosine phosphorylation by B cell receptor (BCR) kinases and is recruited to the plasma membrane where its substrate is located. It is required in pre-BCR signaling and in the maturation of B cells. PLCs catalyze the hydrolysis of phosphatidylinositol (4,5)-bisphosphate [PtdIns(4,5)P2] to produce Ins(1,4,5)P3 and diacylglycerol (DAG). Ins(1,4,5)P3 initiates the calcium signaling cascade while DAG functions as an activator of PKC. PLCgamma contains a Pleckstrin homology (PH) domain followed by an elongation factor (EF) domain, two catalytic regions of PLC domains that flank two tandem SH2 domains, followed by a SH3 domain and C2 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212902 Cd Length: 55 Bit Score: 37.90 E-value: 2.02e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELqarGKKRQKgWFPASHVK 1101
Cdd:cd11969     8 YRAKRSDELSFCKGALIHNVSKETGGWWKGDY---GGKVQH-YFPSNYVE 53

Second C-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba, and similar domains; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin, Rho GTPase signaling, and actin dynamics. It plays an important role in regulating cell junction configuration. The C-terminal SH3 domains of DNMBP bind to N-WASP and Ena/VASP proteins, which are key regulatory proteins of the actin cytoskeleton. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213017 [Multi-domain] Cd Length: 57 Bit Score: 37.86 E-value: 2.05e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQ-----KDGEWWTGSIGERTGIFPSNYVR 1023
Cdd:cd12141     2 YYAVYTFKARSPNELSVSANQRVRILEfsdltGNKEWWLAEANGQKGYVPSNYIR 56

Domain of unknown function (DUF4670); This family of proteins is found in eukaryotes. Proteins in this family are typically between 373 and 763 amino acids in length.

Pssm-ID: 464815 [Multi-domain] Cd Length: 522 Bit Score: 42.63 E-value: 2.10e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   649 KELRESYNTQQLALEQLHKIkRDKLKEIERKRLEQIQ--KKKLEDEAARKAKQGK-----ENLWRESIRKEEEEKQKRLQ 721
Cdd:pfam15709  355 REQEEQRRLQQEQLERAEKM-REELELEQQRRFEEIRlrKQRLEEERQRQEEEERkqrlqLQAAQERARQQQEEFRRKLQ 433

                           90
                   ....*....|....*....
gi 312176401   722 EEKsQDKTQEEERKAEAKQ 740
Cdd:pfam15709  434 ELQ-RKKQQEEAERAEAEK 451

Src Homology 3 domain of Sorting nexin 9; Sorting nexin 9 (SNX9), also known as SH3PX1, is a cytosolic protein that interacts with proteins associated with clathrin-coated pits such as Cdc-42-associated tyrosine kinase 2 (ACK2). It binds class I polyproline sequences found in dynamin 1/2 and the WASP/N-WASP actin regulators. SNX9 is localized to plasma membrane endocytic sites and acts primarily in clathrin-mediated endocytosis. Its array of interacting partners suggests that SNX9 functions at the interface between endocytosis and actin cytoskeletal organization. SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX9 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212831 Cd Length: 57 Bit Score: 37.92 E-value: 2.11e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEAR-NHDEMSFSSGDIIQVDEKTVGePGWLYG-SFQGKFGWFPCNYVE 802
Cdd:cd11898     3 RVLYDFAAEpGNNELTVKEGEIITVTNPNVG-GGWIEAkNSQGERGLVPTDYVE 55

Second Src homology 3 domain of Tyrosine kinase substrate with five SH3 domains; Tks5, also called SH3 and PX domain-containing protein 2A (SH3PXD2A) or Five SH (FISH), is a scaffolding protein and Src substrate that is localized in podosomes, which are electron-dense structures found in Src-transformed fibroblasts, osteoclasts, macrophages, and some invasive cancer cells. It binds and regulates some members of the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. It is required for podosome formation, degradation of the extracellular matrix, and cancer cell invasion. Tks5 contains an N-terminal Phox homology (PX) domain and five SH3 domains. This model characterizes the second SH3 domain of Tks5. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213010 Cd Length: 54 Bit Score: 37.70 E-value: 2.11e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12077     4 VTVQPYTSQGKDEIGFEKGVTVEVIQKNLEGWWYIRYLGKEGWAPASYLK 53

Second Src Homology 3 domain of the fungal endocytic adaptor protein Sla1p; Sla1p facilitates endocytosis by playing a role as an adaptor protein in coupling components of the actin cytoskeleton to the endocytic machinery. It interacts with Abp1p, Las17p and Pan1p, which are activator proteins of actin-related protein 2/3 (Arp2/3). Sla1p contains multiple domains including three SH3 domains, a SAM (sterile alpha motif) domain, and a Sla1 homology domain 1 (SHD1), which binds to the NPFXD motif that is found in many integral membrane proteins such as the Golgi-localized Arf-binding protein Lsb5p and the P4-ATPases, Drs2p and Dnf1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212708 [Multi-domain] Cd Length: 52 Bit Score: 37.83 E-value: 2.12e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILV-TQKDGEW-WTGSIGERTGIFPSNYV 1022
Cdd:cd11774     4 ALYDYDKQTEEELSFNEGDTLDVyDDSDSDWiLVGFNGTQFGFVPANYI 52

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding protein family member, Neural precursor cell Expressed, Developmentally Down-regulated 9; NEDD9 is also called human enhancer of filamentation 1 (HEF1) or CAS-L (Crk-associated substrate in lymphocyte). It was first described as a gene predominantly expressed in early embryonic brain, and was also isolated from a screen of human proteins that regulate filamentous budding in yeast, and as a tyrosine phosphorylated protein in lymphocytes. It promotes metastasis in different solid tumors. NEDD9 localizes in focal adhesions and associates with FAK and Abl kinase. It also interacts with SMAD3 and the proteasomal machinery which allows its rapid turnover; these interactions are not shared by other CAS proteins. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212935 Cd Length: 57 Bit Score: 38.04 E-value: 2.14e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDD---PDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd12002     4 ALYDNVPECAEELAFRKGDILTVIEQNTgglEGWWLCSLHGRQGIAPGNRLKL 56

EF-hand domain pair;

Pssm-ID: 463900 [Multi-domain] Cd Length: 67 Bit Score: 38.00 E-value: 2.14e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401   248 KYRQKFNSLDKGMSGYLSG--FQA--RNALLQSNLSQTQLATIWTLADIDGDGQLKAEEFILAM 307
Cdd:pfam13499    3 KLKEAFKLLDSDGDGYLDVeeLKKllRKLEEGEPLSDEEVEELFKEFDLDKDGRISFEEFLELY 66

Src homology 3 domain of CAS (Crk-Associated Substrate) scaffolding proteins; CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes including migration, chemotaxis, apoptosis, differentiation, and progenitor cell function. They mediate the signaling of integrins at focal adhesions where they localize, and thus, regulate cell invasion and survival. Over-expression of these proteins is implicated in poor prognosis, increased metastasis, and resistance to chemotherapeutics in many cancers such as breast, lung, melanoma, and glioblastoma. CAS proteins have also been linked to the pathogenesis of inflammatory disorders, Alzheimer's, Parkinson's, and developmental defects. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. Vertebrates contain four CAS proteins: BCAR1 (or p130Cas), NEDD9 (or HEF1), EFS (or SIN), and CASS4 (or HEPL). The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212778 Cd Length: 56 Bit Score: 37.71 E-value: 2.17e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEILVTQKDGE----WWTGSIGERTGIFPSNYVR 1023
Cdd:cd11844     4 ALYDNVAESPDELAFRRGDILTVLEQNTAglegWWLCSLRGRQGIAPGNRLK 55

First Src Homology 3 domain of SH3 domain containing ring finger 2; SH3RF2 is also called POSHER (POSH-eliminating RING protein) or HEPP1 (heart protein phosphatase 1-binding protein). It acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1 (or POSH), a scaffold protein that is required for pro-apoptotic JNK activation. It may also play a role in cardiac functions together with protein phosphatase 1. SH3RF2 contains an N-terminal RING finger domain and three SH3 domains. This model represents the first SH3 domain, located at the N-terminal half, of SH3RF2. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212862 Cd Length: 54 Bit Score: 37.61 E-value: 2.23e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  751 RALYPFEARNHDEMSFSSGDII----QVDEKtvgepgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11929     4 KALCNYRGHNPGDLKFNKGDVIllrrQLDEN------WYLGEINGVSGIFPASSVE 53

exonuclease SbcC; All proteins in this family for which functions are known are part of an exonuclease complex with sbcD homologs. This complex is involved in the initiation of recombination to regulate the levels of palindromic sequences in DNA. This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University). [DNA metabolism, DNA replication, recombination, and repair]

Pssm-ID: 129705 [Multi-domain] Cd Length: 1042 Bit Score: 43.03 E-value: 2.26e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   363 TFEDKRKAnyeRGNMELEKRR-----QVLMEQQQREAERKAQKEKE--EWERKQRELQEQEWKKQLELEK---RLEKQRe 432
Cdd:TIGR00618  185 EFAKKKSL---HGKAELLTLRsqlltLCTPCMPDTYHERKQVLEKElkHLREALQQTQQSHAYLTQKREAqeeQLKKQQ- 260

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   433 lerqreeerrkeierreaAKQELERQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSlhleLEAVNGKHQQISGRLQd 512
Cdd:TIGR00618  261 ------------------LLKQLRARIEELRAQEAVLEETQERINRARKAAPLAAHIKA----VTQIEQQAQRIHTELQ- 317

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   513 VQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEyQNKLIYLVPEKQLLNERIKNMQLSNTPDsgislLHKKSSEKE-- 590
Cdd:TIGR00618  318 SKMRSRAKLLMKRAAHVKQQSSIEEQRRLLQTLHS-QEIHIRDAHEVATSIREISCQQHTLTQH-----IHTLQQQKTtl 391

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   591 -ELCQRLKEQLDALEKETASKLSEMDSFNnqlkcgsmddcVLQCLlsllsclnnlfLLLKELRESYNTQQLALEQLHkik 669
Cdd:TIGR00618  392 tQKLQSLCKELDILQREQATIDTRTSAFR-----------DLQGQ-----------LAHAKKQQELQQRYAELCAAA--- 446

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   670 rdklkeIERKRLEQIQKKKLEDEAARKAKQGKENLW-RESIRKEEEEKQKrlQEEKSQDKTQEEERKAEAKQSETASALV 748
Cdd:TIGR00618  447 ------ITCTAQCEKLEKIHLQESAQSLKEREQQLQtKEQIHLQETRKKA--VVLARLLELQEEPCPLCGSCIHPNPARQ 518

Src homology 3 domain of Endophilin-B; Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They are classified into two types, A and B. Vertebrates contain two endophilin-B isoforms. Endophilin-B proteins are cytoplasmic proteins expressed mainly in the heart, placenta, and skeletal muscle. Endophilins contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212736 [Multi-domain] Cd Length: 52 Bit Score: 37.65 E-value: 2.30e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11802     4 VLYDYDAEDSTELSLLADEVITVYELPgmDEDYMMGERGSQRGKVPVAY 52

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 37.62 E-value: 2.31e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQEN-WWFGE-VHGG-RGWFPKSYVK 933
Cdd:cd11939     1 QVQCVHPYVSQEPDELSLELADVLNILDKTDDgWIFGErLHDQeRGWFPSSVVE 54

Src homology 3 domain of High osmolarity signaling protein Sho1p; Sho1p (or Sho1), also called SSU81 (Suppressor of SUA8-1 mutation), is a yeast membrane protein that regulates adaptation to high salt conditions by activating the HOG (high-osmolarity glycerol) pathway. High salt concentrations lead to the localization to the membrane of the MAPKK Pbs2, which is then activated by the MAPKK Ste11 and in turn, activates the MAPK Hog1. Pbs2 is localized to the membrane though the interaction of its PxxP motif with the SH3 domain of Sho1p. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212789 [Multi-domain] Cd Length: 55 Bit Score: 37.78 E-value: 2.36e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  883 KAQALCSWTAKKE--NHLNFSKHDVITVLEQQENWWFGEVHGGR-GWFPKSYVKL 934
Cdd:cd11855     1 RARALYPYDASPDdpNELSFEKGEILEVSDTSGKWWQARKSNGEtGICPSNYLQL 55

Ezrin/radixin/moesin, alpha-helical domain; The ERM family consists of three closely-related proteins, ezrin, radixin and moesin. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions, and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). ERM molecules contain 3 domains, an N-terminal globular domain, an extended alpha-helical domain and a charged C-terminal domain (pfam00769). Ezrin, radixin and merlin also contain a polyproline linker region between the helical and C-terminal domains. The N-terminal domain is highly conserved and is also found in merlin, band 4.1 proteins and members of the band 4.1 superfamily, designated the FERM domain. ERM proteins crosslink actin filaments with plasma membranes. They co-localize with CD44 at actin filament plasma membrane interaction sites, associating with CD44 via their N-terminal domains and with actin filaments via their C-terminal domains. This is the alpha-helical domain, which is involved in intramolecular masking of protein-protein interaction sites, regulating the activity of this proteins.

Pssm-ID: 466641 [Multi-domain] Cd Length: 120 Bit Score: 39.52 E-value: 2.38e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   652 RESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLwrESIRKEEEEKQKRLQEEKS-QDKTQ 730
Cdd:pfam20492    1 REEAEREKQELEERLKQYEEETKKAQEELEESEETAEELEEERRQAEEEAERL--EQKRQEAEEEKERLEESAEmEAEEK 78

                           90
                   ....*....|....*
gi 312176401   731 EE-ERKAEAKQSETA 744
Cdd:pfam20492   79 EQlEAELAEAQEEIA 93

First Src Homology 3 domain of Nck1 adaptor protein; Nck1 (also called Nckalpha) plays a crucial role in connecting signaling pathways of tyrosine kinase receptors and important effectors in actin dynamics and cytoskeletal remodeling. It binds and activates RasGAP, resulting in the downregulation of Ras. It is also involved in the signaling of endothilin-mediated inhibition of cell migration. Nck adaptor proteins regulate actin cytoskeleton dynamics by linking proline-rich effector molecules to protein tyrosine kinases and phosphorylated signaling intermediates. They contain three SH3 domains and a C-terminal SH2 domain. They function downstream of the PDGFbeta receptor and are involved in Rho GTPase signaling and actin dynamics. Vertebrates contain two Nck adaptor proteins: Nck1 (also called Nckalpha) and Nck2, which show partly overlapping functions but also bind distinct targets. The first SH3 domain of Nck1 binds the PxxDY sequence in the CD3e cytoplasmic tail; this binding inhibits phosphorylation by Src kinases, resulting in the downregulation of TCR surface expression. SH3 domains are protein interaction domains that usually bind to proline-rich ligands with moderate affinity and selectivity, preferentially a PxxP motif. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212833 [Multi-domain] Cd Length: 59 Bit Score: 37.78 E-value: 2.40e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNkDDPDWWQ-GETNGLTGLFPSNYVK 1170
Cdd:cd11900     5 VVAKFDYVAQQDQELDIKKNERLWLLD-DSKSWWRvRNAMNKTGFVPSNYVE 55

Second Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the second SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212949 Cd Length: 54 Bit Score: 37.82 E-value: 2.42e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*.
gi 312176401  889 SWTAKKENHLNFSKHDVITVLEQQ-ENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12016     8 AYKAENEDEIGFETGVVVEVIQKNlDGWWKIRYQGKEGWAPATYLK 53

C2 domain second repeat present in Synaptotagmin 17; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 17 is located in the brain, kidney, and prostate and is thought to be a peripheral membrane protein. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176055 [Multi-domain] Cd Length: 135 Bit Score: 39.87 E-value: 2.42e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMGS-----QSYTTRTLQDTLNPKWNFNCQFFI--KDLYQDVLCLTMFDRDQ 1629
Cdd:cd08410    14 GRLNVDIIRAKQLLQTDMSQGSDPFVKIQLVHglkliKTKKTSCMRGTIDPFYNESFSFKVpqEELENVSLVFTVYGHNV 93


                  ....*....
gi 312176401 1630 FSPDDFLGR 1638
Cdd:cd08410    94 KSSNDFIGR 102

First Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212695 [Multi-domain] Cd Length: 57 Bit Score: 37.73 E-value: 2.43e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEI-LVTQKDGEWWT---GSIGErTGIFPSNYV 1022
Cdd:cd11761     5 KVLYSYEAQRPDELTITEGEELeVIEDGDGDGWVkarNKSGE-VGYVPENYL 55

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 37.43 E-value: 2.44e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*
gi 312176401 1125 DYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd12017     7 EFQATIQDGISFQKGQKVEVIDKNPSGWWYVKIDGKEGWAPSSYI 51

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 37.68 E-value: 2.47e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1052 YAASGTEQLSLAPGQLILILKK--NTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd11977     9 FAARDMRELSLREGDVVRIYSRigGDQGWWKGETNGR-----IGWFPSTYVE 55

C-terminal Src Homology 3 domain of Nebulette and LIM-nebulette (or Lasp2); Nebulette is a cardiac-specific protein that localizes to the Z-disc. It interacts with tropomyosin and is important in stabilizing actin thin filaments in cardiac muscles. Polymorphisms in the nebulette gene are associated with dilated cardiomyopathy, with some mutations resulting in severe heart failure. Nebulette is a 107kD protein that contains an N-terminal acidic region, multiple nebulin repeats, and a C-terminal SH3 domain. LIM-nebulette, also called Lasp2 (LIM and SH3 domain protein 2), is an alternatively spliced variant of nebulette. Although it shares a gene with nebulette, Lasp2 is not transcribed from a muscle-specific promoter, giving rise to its multiple tissue expression pattern with highest amounts in the brain. It can crosslink actin filaments and it affects cell spreading. Lasp2 is a 34kD protein containing an N-terminal LIM domain, three nebulin repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212868 [Multi-domain] Cd Length: 58 Bit Score: 37.68 E-value: 2.51e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGE--RTGIFPSNYV 1022
Cdd:cd11935     3 YRAMYDYSAQDEDEVSFRDGDYIVNVQPiDEGWMYGTVQRtgRTGMLPANYI 54

Second Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212749 [Multi-domain] Cd Length: 52 Bit Score: 37.55 E-value: 2.52e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  753 LYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11815     5 LHDFPAEHSDDLSLNSGEIVYLLEKIDTE--WYRGKCKNTTGIFPANHVK 52

Src homology 3 domain of RUN and SH3 domain-containing protein 2; RUSC2, also called Iporin or Interacting protein of Rab1, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. RUSC proteins are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212890 Cd Length: 52 Bit Score: 37.59 E-value: 2.53e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYV 1169
Cdd:cd11957     1 EVKALCHHIATEPGQLSFNKGDILQVLSRADGDWLRCSLGPDSGLVPIAYV 51

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53, Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2 (BAIAP2)-Like proteins, and similar proteins; Proteins in this family include IRSp53, BAIAP2L1, BAIAP2L2, and similar proteins. They all contain an Inverse-Bin/Amphiphysin/Rvs (I-BAR) or IMD domain in addition to the SH3 domain. IRSp53, also known as BAIAP2, is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. BAIAP2L1, also called IRTKS (Insulin Receptor Tyrosine Kinase Substrate), serves as a substrate for the insulin receptor and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. IRSp53 and IRTKS also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. BAIAP2L2 co-localizes with clathrin plaques but its function has not been determined. The SH3 domains of IRSp53 and IRTKS have been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212713 [Multi-domain] Cd Length: 57 Bit Score: 37.69 E-value: 2.53e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQ-GET--NGLTGLFPSNYVK 1170
Cdd:cd11779     2 RVKALYPHAAGGETQLSFEEGDVITLLGPEPRDGWHyGENerSGRRGWFPIAYTE 56

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 37.63 E-value: 2.59e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTVGEpgWLYGSFQG---KFGWFPCNYV 801
Cdd:cd11966     3 KALYNCVADNPDELTFSEGEIIIVDGEEDKE--WWIGHIDGeptRRGAFPVSFV 54

C2 domain second repeat present in Synaptotagmin 1; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. Synaptotagmin 1, a member of the class 1 synaptotagmins, is located in the brain and endocranium and localized to the synaptic vesicles and secretory granules. It functions as a Ca2+ sensor for fast exocytosis. It, like synaptotagmin-2, has an N-glycosylated N-terminus. Synaptotagmin 4, a member of class 4 synaptotagmins, is located in the brain. It functions are unknown. It, like synaptotagmin-11, has an Asp to Ser substitution in its C2A domain. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the second C2 repeat, C2B, and has a type-I topology.

Pssm-ID: 176047 [Multi-domain] Cd Length: 136 Bit Score: 39.69 E-value: 2.62e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEATELKACKPNGKSNPYCEVSMG------SQSYTTRTlQDTLNPKWNFNCQFFIK-DLYQDV-LCLTMFDRD 1628
Cdd:cd08402    15 GKLTVVILEAKNLKKMDVGGLSDPYVKIHLMqngkrlKKKKTTIK-KRTLNPYYNESFSFEVPfEQIQKVhLIVTVLDYD 93

                          90
                  ....*....|
gi 312176401 1629 QFSPDDFLGR 1638
Cdd:cd08402    94 RIGKNDPIGK 103

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 42.14 E-value: 2.70e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   657 TQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDE---AARKAKQGKENLWR---ESIRKEEEEKQKRLQEEKSQDKTQ 730
Cdd:TIGR02794   83 QRAAEQARQKELEQRAAAEKAAKQAEQAAKQAEEKQkqaEEAKAKQAAEAKAKaeaEAERKAKEEAAKQAEEEAKAKAAA 162

                           90
                   ....*....|....*..
gi 312176401   731 EEERKA-EAKQSETASA 746
Cdd:TIGR02794  163 EAKKKAeEAKKKAEAEA 179

Second Src Homology 3 domain (SH3B) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the second SH3 domain (SH3B) of CD2AP. SH3B binds to c-Cbl in a site (TPSSRPLR is the core binding motif) distinct from the c-Cbl/SH3A binding site. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212987 [Multi-domain] Cd Length: 55 Bit Score: 37.64 E-value: 2.71e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd12054     2 QCKVLFEYVPQNEDELELKVGDIIDINEEvEEGWWSGTLNGKSGLFPSNFVK 53

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 37.29 E-value: 2.74e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKDDPDWWQgETN--GLTGLFPSNYVK 1170
Cdd:cd11849     4 ALYDFKSAEPNTLSFSEGETFLLLERSNAHWWL-VTNhsGETGYVPANYVK 53

Predicted nucleic acid-binding protein DR0291, contains C4-type Zn-ribbon domain [General function prediction only];

Pssm-ID: 441187 [Multi-domain] Cd Length: 236 Bit Score: 41.06 E-value: 2.86e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  469 QELLSQktreqedIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVqirkqtqKTELEVLDKQCDLEIMEIKQLQQELKEY 548
Cdd:COG1579    13 QELDSE-------LDRLEHRLKELPAELAELEDELAALEARLEAA-------KTELEDLEKEIKRLELEIEEVEARIKKY 78

                          90       100       110       120       130       140       150
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  549 QNKLiylvpeKQLLNER-IKNMQLSntpdsgISLLHKKSSEKEELCQRLKEQLDALEKETASKLSEMDSFNNQLK 622
Cdd:COG1579    79 EEQL------GNVRNNKeYEALQKE------IESLKRRISDLEDEILELMERIEELEEELAELEAELAELEAELE 141

Mitotic checkpoint protein; This family consists of several eukaryotic mitotic checkpoint (Mitotic arrest deficient or MAD) proteins. The mitotic spindle checkpoint monitors proper attachment of the bipolar spindle to the kinetochores of aligned sister chromatids and causes a cell cycle arrest in prometaphase when failures occur. Multiple components of the mitotic spindle checkpoint have been identified in yeast and higher eukaryotes. In S.cerevisiae, the existence of a Mad1-dependent complex containing Mad2, Mad3, Bub3 and Cdc20 has been demonstrated.

Pssm-ID: 461677 [Multi-domain] Cd Length: 660 Bit Score: 42.42 E-value: 3.08e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   377 MELEKRRQvlmeqqQREAERKAQKEKEEWERKQRELQEQEWKKQLeLEKRLEKQrelerqreeerrkeierREAAKQELE 456
Cdd:pfam05557   21 MELEHKRA------RIELEKKASALKRQLDRESDRNQELQKRIRL-LEKREAEA-----------------EEALREQAE 76

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   457 RQRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELeavngkHQQIsgrlQDVQIRKQTQKTELEVLDKQCDLE-- 534
Cdd:pfam05557   77 LNRLKKKYLEALNKKLNEKESQLADAREVISCLKNELSEL------RRQI----QRAELELQSTNSELEELQERLDLLka 146

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   535 -IMEIKQLQQELKEYQNKLiylvpekQLLNERIKNMQLSNTPDSGISLLHKKSseKEELcqrlkEQLDALEKETAsKLSE 613
Cdd:pfam05557  147 kASEAEQLRQNLEKQQSSL-------AEAEQRIKELEFEIQSQEQDSEIVKNS--KSEL-----ARIPELEKELE-RLRE 211

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   614 MDSFNNQLKcgsmDDCvlqcllsllsclnnlfLLLKELRESYNTQqlaLEQLHKIKRDKLK-EIERKRLEQ--------I 684
Cdd:pfam05557  212 HNKHLNENI----ENK----------------LLLKEEVEDLKRK---LEREEKYREEAATlELEKEKLEQelqswvklA 268

                          330       340       350       360       370       380       390
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   685 QKKKLE----DEAARKAKQ--------GKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSE 742
Cdd:pfam05557  269 QDTGLNlrspEDLSRRIEQlqqreivlKEENSSLTSSARQLEKARRELEQELAQYLKKIEDLNKKLKRHK 338

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1 and similar proteins; This subfamily is composed of SKAP1, SKAP2, and similar proteins. SKAP1 and SKAP2 are immune cell-specific adaptor proteins that play roles in T- and B-cell adhesion, respectively, and are thus important in the migration of T- and B-cells to sites of inflammation and for movement during T-cell conjugation with antigen-presenting cells. Both SKAP1 and SKAP2 bind to ADAP (adhesion and degranulation-promoting adaptor protein), among many other binding partners. They contain a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212800 Cd Length: 53 Bit Score: 37.41 E-value: 3.11e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WWFGEVHGGRGWFPKSYV 932
Cdd:cd11866     3 MGLWDCSGNEPDELSFKRGDLIYIISKEYDsfgWWVGELNGKVGLVPKDYL 53

Coiled-coil domain-containing protein 66; This protein family, named Coiled-coil domain-containing protein 66 (CCDC) refers to a protein domain found in eukaryotes, and is approximately 160 amino acids in length. CCDC66 protein is detected mainly in the inner segments of photoreceptors in many vertebrates including mice and humans. It has been found in dogs, that a mutation in the CCDC66 gene causes generalized progressive retinal atrophy (gPRA). This shows that the protein encoded for by this gene is vital for healthy vision and guards against photoreceptor cell degeneration. The structure of CCDC66 proteins includes a heptad repeat pattern which contains at least one coiled-coil domain. There are at least two or more alpha-helices which form a cable-like structure.

Pssm-ID: 434558 [Multi-domain] Cd Length: 154 Bit Score: 40.16 E-value: 3.13e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   349 QKTQEEEPQKKLpvtfEDKRKANyERGNMELEKRRQVLMEQQQREAERKAQKEKEE-WERKQRELQE-----QEWKKQLE 422
Cdd:pfam15236   63 KQLEEKERQKKL----EEERRRQ-EEQEEEERLRREREEEQKQFEEERRKQKEKEEaMTRKTQALLQamqkaQELAQRLK 137


                   ....
gi 312176401   423 LEKR 426
Cdd:pfam15236  138 QEQR 141

Ezrin/radixin/moesin, alpha-helical domain; The ERM family consists of three closely-related proteins, ezrin, radixin and moesin. Ezrin was first identified as a constituent of microvilli, radixin as a barbed, end-capping actin-modulating protein from isolated junctional fractions, and moesin as a heparin binding protein. A tumour suppressor molecule responsible for neurofibromatosis type 2 (NF2) is highly similar to ERM proteins and has been designated merlin (moesin-ezrin-radixin-like protein). ERM molecules contain 3 domains, an N-terminal globular domain, an extended alpha-helical domain and a charged C-terminal domain (pfam00769). Ezrin, radixin and merlin also contain a polyproline linker region between the helical and C-terminal domains. The N-terminal domain is highly conserved and is also found in merlin, band 4.1 proteins and members of the band 4.1 superfamily, designated the FERM domain. ERM proteins crosslink actin filaments with plasma membranes. They co-localize with CD44 at actin filament plasma membrane interaction sites, associating with CD44 via their N-terminal domains and with actin filaments via their C-terminal domains. This is the alpha-helical domain, which is involved in intramolecular masking of protein-protein interaction sites, regulating the activity of this proteins.

Pssm-ID: 466641 [Multi-domain] Cd Length: 120 Bit Score: 39.13 E-value: 3.15e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   377 MELEKRRQVLMEQ-QQREAE-RKAQKEKEEWERKQRELQEQewKKQLELEK-RLEKQrelerqreeerrkeierREAAKQ 453
Cdd:pfam20492    2 EEAEREKQELEERlKQYEEEtKKAQEELEESEETAEELEEE--RRQAEEEAeRLEQK-----------------RQEAEE 62

                           90       100       110
                   ....*....|....*....|....*....|....*...
gi 312176401   454 ELERQRRLEWERLRRQELLSQKTRE-QEDIVRLSSRKK 490
Cdd:pfam20492   63 EKERLEESAEMEAEEKEQLEAELAEaQEEIARLEEEVE 100

Family of unknown function (DUF5401); This is a family of unknown function found in Chromadorea.

Pssm-ID: 375164 [Multi-domain] Cd Length: 722 Bit Score: 42.42 E-value: 3.21e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   345 LPSYQKTQEEEPQKKLPVTFEDKRKAnYERgNMELEKRRQvlmEQQQREAERKAQKE-------KEEWERKQRELQEQEW 417
Cdd:pfam17380  318 LEEAEKARQAEMDRQAAIYAEQERMA-MER-ERELERIRQ---EERKRELERIRQEEiameisrMRELERLQMERQQKNE 392

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   418 KKQLELE-----KRLEKQRELERQREEERRKE-IERREAAKQE----LERQRRLEWERLRRQELLSQKT----REQEDiv 483
Cdd:pfam17380  393 RVRQELEaarkvKILEEERQRKIQQQKVEMEQiRAEQEEARQRevrrLEEERAREMERVRLEEQERQQQverlRQQEE-- 470

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   484 rlSSRKKSLHLELEAVNGKHQQisgrlqdvQIRKQTQKTELEVLDKQCDLEIMEIKQLQQELKEYQNKLIYLVPEKQLLN 563
Cdd:pfam17380  471 --ERKRKKLELEKEKRDRKRAE--------EQRRKILEKELEERKQAMIEEERKRKLLEKEMEERQKAIYEEERRREAEE 540

                          250       260       270       280
                   ....*....|....*....|....*....|....*....|...
gi 312176401   564 ERIKNMQLSNtpdsgisllHKKSSEKEELCQRLKEQLDALEKE 606
Cdd:pfam17380  541 ERRKQQEMEE---------RRRIQEQMRKATEERSRLEAMERE 574

Second Src Homology 3 domain of SH3 domain containing ring finger proteins; This model represents the second SH3 domain of SH3RF1 (or POSH), SH3RF2 (or POSHER), SH3RF3 (POSH2), and similar domains. Members of this family are scaffold proteins that function as E3 ubiquitin-protein ligases. They all contain an N-terminal RING finger domain and multiple SH3 domains; SH3RF1 and SH3RF3 have four SH3 domains while SH3RF2 has three. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3RF2 acts as an anti-apoptotic regulator of the JNK pathway by binding to and promoting the degradation of SH3RF1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212721 [Multi-domain] Cd Length: 53 Bit Score: 37.31 E-value: 3.23e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  751 RALYPFEARNHDE---MSFSSGDIIQV----DEKtvgepgWLYGSFQGKFGWFPCNY 800
Cdd:cd11787     3 KALYDFEMKDEDEkdcLTFKKGDVITVirrvDEN------WAEGRLGDKIGIFPISF 53

C2 domain present in Toll-interacting protein (Tollip); Tollip is a part of the Interleukin-1 receptor (IL-1R) signaling pathway. Tollip is proposed to link serine/threonine kinase IRAK to IL-1Rs as well as inhibiting phosphorylation of IRAK. There is a single C2 domain present in Tollip. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions.

Pssm-ID: 175983 [Multi-domain] Cd Length: 121 Bit Score: 39.24 E-value: 3.26e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1557 GRLMVHVIEAtelKACKPNG--KSNPYCEVSMGSQSYTTRT-LQDTLNPKWNFNCQFFIKDLYqDVLCLTMFDRDQFSPD 1633
Cdd:cd04016     2 GRLSITVVQA---KLVKNYGltRMDPYCRIRVGHAVYETPTaYNGAKNPRWNKTIQCTLPEGV-DSIYIEIFDERAFTMD 77

                          90
                  ....*....|
gi 312176401 1634 DFLGRTEVPV 1643
Cdd:cd04016    78 ERIAWTHITI 87

Src Homology 3 domain of Insulin Receptor tyrosine kinase Substrate p53; IRSp53 is also known as BAIAP2 (Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2). It is a scaffolding protein that takes part in many signaling pathways including Cdc42-induced filopodia formation, Rac-mediated lamellipodia extension, and spine morphogenesis. IRSp53 exists as multiple splicing variants that differ mainly at the C-termini. One variant (T-form) is expressed exclusively in human breast cancer cells. The gene encoding IRSp53 is a putative susceptibility gene for Gilles de la Tourette syndrome. IRSp53 can also mediate the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD, a CRIB (Cdc42 and Rac interactive binding motif), an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRSp53 has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212848 Cd Length: 59 Bit Score: 37.30 E-value: 3.40e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401  883 KAQALCSWTAKKENHL-NFSKHDVITVL--EQQENWWFGEVHGG--RGWFPKSYVKLI 935
Cdd:cd11915     2 RVQAIFSHAAGDNSTLlSFKEGDYITLLvpEARDGWHYGECEKTkmRGWFPFSYTRVL 59

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 37.29 E-value: 3.43e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd11849     2 YRALYDFKSAEPNTLSFSEGETFLLLERS-NAHWWLVTNHSGETGYVPANYVK 53

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 41.75 E-value: 3.48e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   658 QQLALEQLHKIKRDKLKEI--ERKRLEQIQKKKLEDEAARKAKQGKENlwRESIRKEEEEKQKRLQEEKSQDKTQEEERK 735
Cdd:TIGR02794   66 EQERQKKLEQQAEEAEKQRaaEQARQKELEQRAAAEKAAKQAEQAAKQ--AEEKQKQAEEAKAKQAAEAKAKAEAEAERK 143

                           90
                   ....*....|
gi 312176401   736 AEA---KQSE 742
Cdd:TIGR02794  144 AKEeaaKQAE 153

Tetrahymena thermophila ribosomal protein mS26 and similar proteins; Ribosomal protein mS26 is a component of small subunit (SSU) in Tetrahymena thermophila mitochondrial ribosome (mitoribosome). The structure of the mitoribosome reveals an assembly of 94-ribosomal proteins and four-rRNAs with an additional protein mass of ~700 kDa on the small subunit; the large mitoribosomal subunit (LSU) lacks 5S rRNA.

Pssm-ID: 467909 [Multi-domain] Cd Length: 496 Bit Score: 42.12 E-value: 3.51e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  523 ELEVLDKQCDLEIMEIKQLQQELKEYQNKLiyLVPEKQLLNERIKNMqlSNTPDS----------GISLLHKKSSEKEel 592
Cdd:cd23695   144 ELAFLFEQGDHEEMDKLLDENEEIEYKNSL--LMPIYQDLKSLIKHL--KYTELFkllkeyqdakAIIIEDFRESSEE-- 217

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  593 cqrLKEQLDALEKETA----SKLSEMDSFNNQLKcgsmddcvlqcllsllsclnnlfLLLKELRESYNTQQLALEQLHKI 668
Cdd:cd23695   218 ---GAEKLEKLEKAFAtllkNYKEELEEPEKQLE-----------------------FMQKRLLDLYNLLRLWGQYITIV 271

                         170       180       190       200       210       220       230
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  669 KRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLwRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSETAS 745
Cdd:cd23695   272 KMPDSVVRDIMNKTQARPEVAKLNSKQELEDAKNRK-RDTEENEFDDDYESADEGETSDEEDEIEEENFQLQKEKKK 347

Src homology 3 domain of eumetazoan Actin-binding protein 1; Abp1, also called drebrin-like protein, is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a helical domain, and a C-terminal SH3 domain. Mammalian Abp1, unlike yeast Abp1, does not contain an acidic domain that interacts with the Arp2/3 complex. It regulates actin dynamics indirectly by interacting with dynamin and WASP family proteins. Abp1 deficiency causes abnormal organ structure and function of the spleen, heart, and lung of mice. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212893 [Multi-domain] Cd Length: 54 Bit Score: 36.99 E-value: 3.56e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGelqaRGKKRQKGWFPASHVKL 1102
Cdd:cd11960     8 YQAADDTEISFDPGDIITDIEQIDEGWWRG----TGPDGTYGLFPANYVEL 54

Src Homology 3 domain of Cdc42-Interacting Protein 4, Bzz1 and similar domains; This subfamily is composed of Cdc42-Interacting Protein 4 (CIP4) and similar proteins such as Formin Binding Protein 17 (FBP17) and FormiN Binding Protein 1-Like (FNBP1L), as well as yeast Bzz1 (or Bzz1p). CIP4 and FNBP1L are Cdc42 effectors that bind Wiskott-Aldrich syndrome protein (WASP) and function in endocytosis. CIP4 and FBP17 bind to the Fas ligand and may be implicated in the inflammatory response. CIP4 may also play a role in phagocytosis. Bzz1 is also a WASP/Las17-interacting protein involved in endocytosis and trafficking to the vacuole. It physically interacts with type I myosins and functions in the early steps of endocytosis. Members of this subfamily contain an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs) domain as well as at least one C-terminal SH3 domain. Bzz1 contains a second SH3 domain at the C-terminus. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212711 [Multi-domain] Cd Length: 55 Bit Score: 37.20 E-value: 3.59e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQ--GETNGLTGLFPSNYVKM 1171
Cdd:cd11777     1 ECKALYAFVGSSEGTISMTEGEKLSLVEEDKGDGWTrvRRDTGEEGYVPTSYIRI 55

Src homology 3 domain of Endophilin-B2; Endophilin-B2, also called SH3GLB2 (SH3-domain GRB2-like endophilin B2), is a cytoplasmic protein that interacts with the apoptosis inducer Bax. It is overexpressed in prostate cancer metastasis and has been identified as a cancer antigen with potential utility in immunotherapy. Endophilins play roles in synaptic vesicle formation, virus budding, mitochondrial morphology maintenance, receptor-mediated endocytosis inhibition, and endosomal sorting. They contain an N-terminal N-BAR domain (BAR domain with an additional N-terminal amphipathic helix), followed by a variable region containing proline clusters, and a C-terminal SH3 domain. Endophilin-B2 forms homo- and heterodimers (with endophilin-B1) through its BAR domain. The related protein endophilin-B1 interacts with amphiphysin 1 and dynamin 1 through its SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212877 Cd Length: 55 Bit Score: 37.28 E-value: 3.72e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401 1122 AMYDYMANNEDELNFSKGQLINVMNKD--DPDWWQGETNGLTGLFPSNYVKM 1171
Cdd:cd11944     4 VLYDYEAADSSELALLADELITVYSLPgmDPDWLIGERGNQKGKVPVTYLEL 55

Src homology 3 domain of ArfGAP with SH3 domain, ankyrin repeat and PH domain containing protein 2; ASAP2 is also called DDEF2 (Development and Differentiation Enhancing Factor 2), AMAP2, centaurin beta-3, or PAG3. It mediates the functions of Arf GTPases vial dual mechanisms: it exhibits GTPase activating protein (GAP) activity towards class I (Arf1) and II (Arf5) Arfs; and it binds class III Arfs (GTP-Arf6) stably without GAP activity. It binds paxillin and is implicated in Fcgamma receptor-mediated phagocytosis in macrophages and in cell migration. ASAP2 contains an N-terminal BAR domain, followed by a Pleckstrin homology (PH) domain, an Arf GAP domain, ankyrin (ANK) repeats, and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212899 Cd Length: 56 Bit Score: 37.24 E-value: 3.76e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITV-LEQQENWWFGEVHGG---RGWFPKSYV 932
Cdd:cd11966     1 RVKALYNCVADNPDELTFSEGEIIIVdGEEDKEWWIGHIDGEptrRGAFPVSFV 54

First C-terminal Src homology 3 domain of Fungal Actin-binding protein 1; Abp1 is an adaptor protein that functions in receptor-mediated endocytosis and vesicle trafficking. It contains an N-terminal actin-binding module, the actin-depolymerizing factor (ADF) homology domain, a central proline-rich region, and a C-terminal SH3 domain (many yeast Abp1 proteins contain two C-terminal SH3 domains). Yeast Abp1 also contains two acidic domains that bind directly to the Arp2/3 complex, which is required to initiate actin polymerization. The SH3 domain of yeast Abp1 binds and localizes the kinases, Ark1p and Prk1p, which facilitate actin patch disassembly following vesicle internalization. It also mediates the localization to the actin patch of the synaptojanin-like protein, Sjl2p, which plays a key role in endocytosis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212895 [Multi-domain] Cd Length: 54 Bit Score: 37.08 E-value: 3.77e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401 1046 AQVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGElqarGKKRQKGWFPASHVKL 1102
Cdd:cd11962     2 AVVLYDYEKDEDNEIELVEGEIVTNIEMVDEDWWMGT----NSKGESGLFPSNYVEL 54

Third Src Homology 3 domain of SH3 domain containing ring finger 3, an E3 ubiquitin-protein ligase; SH3RF3 is also called POSH2 (Plenty of SH3s 2) or SH3MD4 (SH3 multiple domains protein 4). It is a scaffold protein with E3 ubiquitin-protein ligase activity. It was identified in the screen for interacting partners of p21-activated kinase 2 (PAK2). It may play a role in regulating JNK mediated apoptosis in certain conditions. It also interacts with GTP-loaded Rac1. SH3RF3 is highly homologous to SH3RF1; it also contains an N-terminal RING finger domain and four SH3 domains. This model represents the third SH3 domain, located in the middle, of SH3RF3. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212858 Cd Length: 57 Bit Score: 37.28 E-value: 3.87e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSF--QGKFGWFPCNYVEKV 804
Cdd:cd11925     3 YLALYAYKPQKNDELELRKGEMYRVIEKC--QDGWFKGTSlrTGVSGVFPGNYVTPV 57

Src homology 3 domain of Type I fungal Myosins; Type I myosins (myosin-I) are actin-dependent motors in endocytic actin structures and actin patches. They play roles in membrane traffic in endocytic and secretory pathways, cell motility, and mechanosensing. Saccharomyces cerevisiae has two myosins-I, Myo3 and Myo5, which are involved in endocytosis and the polarization of the actin cytoskeleton. Myosin-I contains an N-terminal actin-activated ATPase, a phospholipid-binding TH1 (tail homology 1) domain, and a C-terminal extension which includes an F-actin-binding TH2 domain, an SH3 domain, and an acidic peptide that participates in activating the Arp2/3complex. The SH3 domain of myosin-I is required for myosin-I-induced actin polymerization. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212792 [Multi-domain] Cd Length: 55 Bit Score: 36.98 E-value: 3.95e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  974 YIALYSYSSVEPGDLTFTEGEEILVTQK-DGEWWTGSIGERT--GIFPSNYVRP 1024
Cdd:cd11858     2 YKALYDFAGSVANELSLKKDDIVYIVQKeDNGWWLAKKLDESkeGWVPAAYLEE 55

TolA protein; TolA couples the inner membrane complex of itself with TolQ and TolR to the outer membrane complex of TolB and OprL (also called Pal). Most of the length of the protein consists of low-complexity sequence that may differ in both length and composition from one species to another, complicating efforts to discriminate TolA (the most divergent gene in the tol-pal system) from paralogs such as TonB. Selection of members of the seed alignment and criteria for setting scoring cutoffs are based largely conserved operon struction. //The Tol-Pal complex is required for maintaining outer membrane integrity. Also involved in transport (uptake) of colicins and filamentous DNA, and implicated in pathogenesis. Transport is energized by the proton motive force. TolA is an inner membrane protein that interacts with periplasmic TolB and with outer membrane porins ompC, phoE and lamB. [Transport and binding proteins, Other, Cellular processes, Pathogenesis]

Pssm-ID: 274303 [Multi-domain] Cd Length: 346 Bit Score: 41.37 E-value: 3.96e-03

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   672 KLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWREsiRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSETASA 746
Cdd:TIGR02794  143 KAKEEAAKQAEEEAKAKAAAEAKKKAEEAKKKAEAE--AKAKAEAEAKAKAEEAKAKAEAAKAKAAAEAAAKAEA 215

C-terminal (or second) Src homology 3 domain of VAV3 protein; VAV3 is ubiquitously expressed and functions as a phosphorylation-dependent guanine nucleotide exchange factor (GEF) for RhoA, RhoG, and Rac1. It has been implicated to function in the hematopoietic, bone, cerebellar, and cardiovascular systems. VAV3 is essential in axon guidance in neurons that control blood pressure and respiration. It is overexpressed in prostate cancer cells and it plays a role in regulating androgen receptor transcriptional activity. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212911 [Multi-domain] Cd Length: 56 Bit Score: 37.31 E-value: 3.96e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE--WWTGSIGERTGIFPSNYV 1022
Cdd:cd11978     4 IARYDFCARDMRELSLLKGDVVKIYTKMSTngWWRGEVNGRVGWFPSTYV 53

Src homology 3 domain of RUN and SH3 domain-containing proteins 1 and 2; RUSC1 and RUSC2, that were originally characterized in silico. They are adaptor proteins consisting of RUN, leucine zipper, and SH3 domains. RUSC1, also called NESCA (New molecule containing SH3 at the carboxy-terminus), is highly expressed in the brain and is translocated to the nuclear membrane from the cytoplasm upon stimulation with neurotrophin. It plays a role in facilitating neurotrophin-dependent neurite outgrowth. It also interacts with NEMO (or IKKgamma) and may function in NEMO-mediated activation of NF-kB. RUSC2, also called Iporin, is expressed ubiquitously with highest amounts in the brain and testis. It interacts with the small GTPase Rab1 and the Golgi matrix protein GM130, and may function in linking GTPases to certain intracellular signaling pathways. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212744 Cd Length: 50 Bit Score: 37.04 E-value: 3.99e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11810     2 VRALCHHVATDSGQLSFRKGDILRVIARVDDDWLLCTRGSTKGLVPLSY 50

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 37.30 E-value: 4.00e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQQENWWF-GEVHGGRGWFPKSYVKLIPG 937
Cdd:cd11972     4 KVVAIYDYTKDKEDELSFQEGAIIYVIKKNDDGWYeGVMNGVTGLFPGNYVESIMH 59

Uncharacterized conserved protein YhaN, contains AAA domain [Function unknown];

Pssm-ID: 443752 [Multi-domain] Cd Length: 641 Bit Score: 41.68 E-value: 4.13e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  378 ELEKRRQVLMEQQQREAERkAQKEKEEWERKQRELQEQEwKKQLELEKRLEKqrelerqreeeRRKEIERREAAKQELER 457
Cdd:COG4717    50 RLEKEADELFKPQGRKPEL-NLKELKELEEELKEAEEKE-EEYAELQEELEE-----------LEEELEELEAELEELRE 116

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  458 QRRLEWERLRRQELLSQKTREQEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQiRKQTQKTELEVLDKQCDLEIM- 536
Cdd:COG4717   117 ELEKLEKLLQLLPLYQELEALEAELAELPERLEELEERLEELRELEEELEELEAELA-ELQEELEELLEQLSLATEEELq 195

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  537 ----EIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQlsntpdsgisllhkKSSEKEELCQRLKEQLDALekETASKLS 612
Cdd:COG4717   196 dlaeELEELQQRLAELEEELEEAQEELEELEEELEQLE--------------NELEAAALEERLKEARLLL--LIAAALL 259

                         250       260       270       280       290       300       310       320
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  613 EMDSFNNQLKCGSMDDC-VLQCLLSLLSCLNNLFLLLKELRESYNTQQLALEQLHKIKRDKLKEI-ERKRLEQIQKKKLE 690
Cdd:COG4717   260 ALLGLGGSLLSLILTIAgVLFLVLGLLALLFLLLAREKASLGKEAEELQALPALEELEEEELEELlAALGLPPDLSPEEL 339

                         330       340       350       360       370       380
                  ....*....|....*....|....*....|....*....|....*....|....*....|....
gi 312176401  691 DEAARKAKQGKEnLWRESIRKEEEEKQKRLQEEKSQ-----DKTQEEERKAEAKQSETASALVN 749
Cdd:COG4717   340 LELLDRIEELQE-LLREAEELEEELQLEELEQEIAAllaeaGVEDEEELRAALEQAEEYQELKE 402

Arginine and glutamate-rich 1; ARGLU, arginine and glutamate-rich 1 protein family, is required for the oestrogen-dependent expression of ESR1 target genes. It functions in cooperation with MED1. The family of proteins is found in eukaryotes.

Pssm-ID: 405931 [Multi-domain] Cd Length: 151 Bit Score: 39.65 E-value: 4.14e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   663 EQLHKIKRDKLKEIERkRLEqIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEERKAEAKQSE 742
Cdd:pfam15346   26 EELEKRKDEIEAEVER-RVE-EARKIMEKQVLEELEREREAELEEERRKEEEERKKREELERILEENNRKIEEAQRKEAE 103

Second or C-terminal Src homology 3 domain of the p47phox subunit of NADPH oxidase, also called Neutrophil Cytosolic Factor 1; p47phox, or NCF1, is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox), which plays a key role in the ability of phagocytes to defend against bacterial infections. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p47phox is required for activation of NADH oxidase and plays a role in translocation. It contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), a polybasic/autoinhibitory region, and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of p47phox. In its inactive state, the tandem SH3 domains interact intramolecularly with the autoinhibitory region; upon activation, the tandem SH3 domains are exposed through a conformational change, resulting in their binding to the PRR of p22phox and the activation of NADPH oxidase. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212955 [Multi-domain] Cd Length: 53 Bit Score: 37.13 E-value: 4.30e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd12022     3 ITIKAYTAVEEDELTLLEGEAIEVIHKLLDGWWVVRKGEVTGYFPSMYLQ 52

C-terminal Src Homology 3 domain of NADPH oxidase activator 1; Noxa1 is a homolog of p67phox and is a cytosolic subunit of the nonphagocytic NADPH oxidase complex Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Noxa1 is co-expressed with Nox1 in colon, stomach, uterus, prostate, and vascular smooth muscle cells, consistent with its regulatory role. It does not interact with p40phox, unlike p67phox, making Nox1 activity independent of p40phox, unlike Nox2. Noxa1 contains TPR, PB1, and C-terminal SH3 domains, but lacks the central SH3 domain that is present in p67phox. The TPR domain binds activated GTP-bound Rac. The C-terminal SH3 domain binds the polyproline motif found at the C-terminus of Noxo1, a homolog of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212980 Cd Length: 53 Bit Score: 37.11 E-value: 4.32e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*...
gi 312176401  886 ALCSWTAKKENHLNFSKHDVITVL-EQQENWWFGEVHGGRGWFPKSYV 932
Cdd:cd12047     4 AQHDYSAQGPEDLEFSQGDTIDILsEVNQEWLEGHCDGRIGIFPKCFA 51

Src Homology 3 domain of Brain-specific Angiogenesis Inhibitor 1-Associated Protein 2-Like 1, also called Insulin Receptor Tyrosine Kinase Substrate (IRTKS); BAIAP2L1 or IRTKS is widely expressed, serves as a substrate for the insulin receptor, and binds the small GTPase Rac. It plays a role in regulating the actin cytoskeleton and colocalizes with F-actin, cortactin, VASP, and vinculin. BAIAP2L1 expression leads to the formation of short actin bundles, distinct from filopodia-like protrusions induced by the expression of the related protein IRSp53. IRTKS mediates the recruitment of effector proteins Tir and EspFu, which regulate host cell actin reorganization, to bacterial attachment sites. It contains an N-terminal IMD or Inverse-Bin/Amphiphysin/Rvs (I-BAR) domain, an SH3 domain, and a WASP homology 2 (WH2) actin-binding motif at the C-terminus. The SH3 domain of IRTKS has been shown to bind the proline-rich C-terminus of EspFu. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212846 Cd Length: 58 Bit Score: 37.20 E-value: 4.33e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1053 AASGTEQLSLAPGQ-LILILKKNTSGWWQGELQARGkkrQKGWFPASHVKL 1102
Cdd:cd11913    11 AGNNKTLLSFAQGDvITLLIPEEKDGWLYGEHDTTK---ARGWFPSSYTRP 58

rad50; All proteins in this family for which functions are known are involvedin recombination, recombinational repair, and/or non-homologous end joining.They are components of an exonuclease complex with MRE11 homologs. This family is distantly related to the SbcC family of bacterial proteins.This family is based on the phylogenomic analysis of JA Eisen (1999, Ph.D. Thesis, Stanford University).

Pssm-ID: 129694 [Multi-domain] Cd Length: 1311 Bit Score: 41.96 E-value: 4.33e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   349 QKTQEEEPQKKLPVTFEDKrkanyergnmELEKRRQVLMEQQQREAERKAQKEKEEW-----ER---------------- 407
Cdd:TIGR00606  200 QKVQEHQMELKYLKQYKEK----------ACEIRDQITSKEAQLESSREIVKSYENEldplkNRlkeiehnlskimkldn 269

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   408 -----KQRELQEQEWKKQLElEKRLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREqedi 482
Cdd:TIGR00606  270 eikalKSRKKQMEKDNSELE-LKMEKVFQGTDEQLNDLYHNHQRTVREKERELVDCQRELEKLNKERRLLNQEKTE---- 344

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   483 vrLSSRKKSLHLELEAVngkHQQIsgRLQDVQIRKQTQKTELEVLDKQCDLEIM--------------EIKQLQQELKEY 548
Cdd:TIGR00606  345 --LLVEQGRLQLQADRH---QEHI--RARDSLIQSLATRLELDGFERGPFSERQiknfhtlvierqedEAKTAAQLCADL 417

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   549 QNKLiyLVPEKQLLNERIKNMQLSNTPDSGISLLHKKSSE----KEELCQRLKEQLDALEKETASKLSEMD----SFNNQ 620
Cdd:TIGR00606  418 QSKE--RLKQEQADEIRDEKKGLGRTIELKKEILEKKQEElkfvIKELQQLEGSSDRILELDQELRKAERElskaEKNSL 495

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   621 LKCGSMDDCVLQCLLSLLSCLNNLfllLKELRESYNTQQLALEQLHKIKRDKLKEIERKRLEQIQ--------------K 686
Cdd:TIGR00606  496 TETLKKEVKSLQNEKADLDRKLRK---LDQEMEQLNHHTTTRTQMEMLTKDKMDKDEQIRKIKSRhsdeltsllgyfpnK 572

                          410       420       430       440       450
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   687 KKLEDEAARKAKQgkENLWRESIRKEEEEKQKrlqEEKSQDKTQEEERKAEAKQS 741
Cdd:TIGR00606  573 KQLEDWLHSKSKE--INQTRDRLAKLNKELAS---LEQNKNHINNELESKEEQLS 622

Coiled-coil domain-containing protein 3; This family is found in eukaryotes; it has several conserved tryptophan residues. The function is not known.

Pssm-ID: 464032 [Multi-domain] Cd Length: 221 Bit Score: 40.46 E-value: 4.50e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   658 QQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENL----------WRESIRKEEEEKQKRLQEEKSQD 727
Cdd:pfam13904   90 KRLAKEKYQEWLQRKARQQTKKREESHKQKAAESASKSLAKPERKVSqeeakevlqeWERKKLEQQQRKREEEQREQLKK 169

                           90
                   ....*....|...
gi 312176401   728 KTQEEERKAEAKQ 740
Cdd:pfam13904  170 EEEEQERKQLAEK 182

Src Homology 3 domain of eumetazoan Peroxisomal biogenesis factor 13; PEX13 is a peroxin and is required for protein import into the peroxisomal matrix and membrane. It is an integral membrane protein that is essential for the localization of PEX14 and the import of proteins containing the peroxisome matrix targeting signals, PTS1 and PTS2. Mutations of the PEX13 gene in humans lead to a wide range of peroxisome biogenesis disorders (PBDs), the most severe of which is known as Zellweger syndrome (ZS), a severe multisystem disorder characterized by hypotonia, psychomotor retardation, and neuronal migration defects. PEX13 contains two transmembrane regions and a C-terminal SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212798 Cd Length: 58 Bit Score: 36.84 E-value: 4.52e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQKDGE-----WWTGSI-GERTGIFPSNYVR 1023
Cdd:cd11864     3 RAEYDFVAESEDELSFRAGDKLRLAPKELQprvrgWLLATVdGQKIGLVPANYVK 57

C-terminal (Fourth) Src Homology 3 domain of SH3 domain containing ring finger 1 (SH3RF1), SH3RF3, and similar domains; SH3RF1 (or POSH) and SH3RF3 (or POSH2) are scaffold proteins that function as E3 ubiquitin-protein ligases. They contain an N-terminal RING finger domain and four SH3 domains. This model represents the fourth SH3 domain, located at the C-terminus of SH3RF1 and SH3RF3, and similar domains. SH3RF1 plays a role in calcium homeostasis through the control of the ubiquitin domain protein Herp. It may also have a role in regulating death receptor mediated and JNK mediated apoptosis. SH3RF3 interacts with p21-activated kinase 2 (PAK2) and GTP-loaded Rac1. It may play a role in regulating JNK mediated apoptosis in certain conditions. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212719 Cd Length: 55 Bit Score: 37.06 E-value: 4.55e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1047 QVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGELQARGKkrqKGWFPASHVK 1101
Cdd:cd11785     3 RVIVPYPPQSEAELELKEGDIVFVHKKREDGWFKGTLQRTGK---TGLFPGSFVE 54

Src Homology 3 domain of Small G protein Signaling Modulator 3; SGSM3 is also called Merlin-associated protein (MAP), RUN and SH3 domain-containing protein (RUSC3), RUN and TBC1 domain-containing protein 3 (RUTBC3), Rab GTPase-activating protein 5 (RabGAP5), or Rab GAP-like protein (RabGAPLP). It is expressed ubiquitously and functions as a regulator of small G protein RAP- and RAB-mediated neuronal signaling. It is involved in modulating NGF-mediated neurite outgrowth and differentiation. It also interacts with the tumor suppressor merlin and may play a role in the merlin-associated suppression of cell growth. SGSM3 contains TBC, SH3, and RUN domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212747 Cd Length: 53 Bit Score: 36.71 E-value: 4.62e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQVDEKTvGEPGWLyGSFQGKFGWFPCNYVE 802
Cdd:cd11813     3 KALLDFERHDDDELGFRKNDIITIISQK-DEHCWV-GELNGLRGWFPAKFVE 52

Src homology 3 domain of Abl Interactor 2; Abi2 is highly expressed in the brain and eye. It regulates actin cytoskeletal reorganization at adherens junctions and dendritic spines, which is important in cell morphogenesis, migration, and cognitive function. Mice deficient with Abi2 show defects in orientation and migration of lens fibers, neuronal migration, dendritic spine morphology, as well as deficits in learning and memory. Abi proteins are adaptor proteins serving as binding partners and substrates of Abl tyrosine kinases. They are involved in regulating actin cytoskeletal reorganization and play important roles in membrane-ruffling, endocytosis, cell motility, and cell migration. Abi proteins contain a homeobox homology domain, a proline-rich region, and a SH3 domain. The SH3 domain of Abi binds to a PxxP motif in Abl. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212905 [Multi-domain] Cd Length: 61 Bit Score: 37.30 E-value: 4.69e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHVK-LLGPS 1106
Cdd:cd11972    11 YTKDKEDELSFQEGAIIYVIKKNDDGWYEGVMNG-----VTGLFPGNYVEsIMHYS 61

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 36.63 E-value: 4.69e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNYVEK 803
Cdd:cd12015     2 YVVVADYKKQQPNEISLRAGDVVDVIEKN--ENGWWFVSLEDEQGWVPATYLEP 53

Fourth Src homology 3 domain (or SH3D) of Intersectin-1; Intersectin-1 (ITSN1) is an adaptor protein that functions in exo- and endocytosis, actin cytoskeletal reorganization, and signal transduction. It plays a role in clathrin-coated pit (CCP) formation. It binds to many proteins through its multidomain structure and facilitate the assembly of multimeric complexes. ITSN1 localizes in membranous organelles, CCPs, the Golgi complex, and may be involved in the cell membrane trafficking system. It exists in alternatively spliced short and long isoforms. The short isoform contains two Eps15 homology domains (EH1 and EH2), a coiled-coil region and five SH3 domains (SH3A-E), while the long isoform, in addition, contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin homology (PH) and C2 domains. The fourth SH3 domain (or SH3D) of ITSN1 has been shown to bind SHIP2, Numb, CdGAP, and N-WASP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212926 Cd Length: 65 Bit Score: 37.40 E-value: 4.72e-03

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|...
gi 312176401  739 KQSETASALVNYRALYPfearnhDEMSFSSGDIIQVDEKTVGepGWLYGSFQGK-----FGWFPCNYVeKVLS 806
Cdd:cd11993     1 KKPEIAQVIASYTATGP------EQLTLAPGQLILIRKKNPG--GWWEGELQARgkkrqIGWFPANYV-KLLS 64

Trichohyalin-plectin-homology domain; This family is a mixtrue of two different families of eukaryotic proteins. Trichoplein or mitostatin, was first defined as a meiosis-specific nuclear structural protein. It has since been linked with mitochondrial movement. It is associated with the mitochondrial outer membrane, and over-expression leads to reduction in mitochondrial motility whereas lack of it enhances mitochondrial movement. The activity appears to be mediated through binding the mitochondria to the actin intermediate filaments (IFs). The family is in the trichohyalin-plectin-homology domain.

Pssm-ID: 464007 [Multi-domain] Cd Length: 341 Bit Score: 41.06 E-value: 4.77e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   512 DVQIR-KQTQKTELEVLDKQCDlEIMEiKQLQQELKEYQNKliylvpEKQLLNERIKNMQLsntpdsgislLHKKSSEKE 590
Cdd:pfam13868   25 DAQIAeKKRIKAEEKEEERRLD-EMME-EERERALEEEEEK------EEERKEERKRYRQE----------LEEQIEERE 86

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   591 ELCQRLKEQLDaLEKEtasklsemdsfnnqlkcgSMDDCVLQCLLSLLSCLNNLFLLLKELREsYNTQQLALEQLHKIKR 670
Cdd:pfam13868   87 QKRQEEYEEKL-QERE------------------QMDEIVERIQEEDQAEAEEKLEKQRQLRE-EIDEFNEEQAEWKELE 146

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   671 DKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRK------EEEEKQKRLQEEKSQDKTQEE-ERKAEAKQSET 743
Cdd:pfam13868  147 KEEEREEDERILEYLKEKAEREEEREAEREEIEEEKEREIArlraqqEKAQDEKAERDELRAKLYQEEqERKERQKEREE 226


                   .
gi 312176401   744 A 744
Cdd:pfam13868  227 A 227

Src homology 3 domain of the Rho guanine nucleotide exchange factor, ephexin-1 (also called NGEF or ARHGEF27); Ephexin-1, also called NGEF (neuronal GEF) or ARHGEF27, activates RhoA, Tac1, and Cdc42 by exchanging bound GDP for free GTP. It is expressed mainly in the brain in a region associated with movement control. It regulates the stability of postsynaptic acetylcholine receptor (AChR) clusters and thus, plays a critical role in the maturation and neurotransmission of neuromuscular junctions. Ephexin-1 directly interacts with the ephrin receptor EphA4 and their coexpression enhances the ability of ephexin-1 to activate RhoA. It is required for normal axon growth and EphA-induced growth cone collapse. Ephexin-1 contains RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212872 [Multi-domain] Cd Length: 55 Bit Score: 36.85 E-value: 4.83e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1047 QVTSAYAASGTEQLSLAPGQLILILKKNTSGWWQGElqaRGKKRQKGWFPASHVK 1101
Cdd:cd11939     3 QCVHPYVSQEPDELSLELADVLNILDKTDDGWIFGE---RLHDQERGWFPSSVVE 54

Membrane protein TolA involved in colicin uptake [Cell wall/membrane/envelope biogenesis];

Pssm-ID: 442298 [Multi-domain] Cd Length: 485 Bit Score: 41.56 E-value: 4.89e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  649 KELRESYNTQQLALEQLHKI--KRDKLKEIERKRLEQIQKKKLED-----EAARKAKQGKENLWRESIRKEEEEKQKRLQ 721
Cdd:COG3064     2 QEALEEKAAEAAAQERLEQAeaEKRAAAEAEQKAKEEAEEERLAEleakrQAEEEAREAKAEAEQRAAELAAEAAKKLAE 81

                          90       100
                  ....*....|....*....|...
gi 312176401  722 EEKSQDKTQEEERKAEAKQSETA 744
Cdd:COG3064    82 AEKAAAEAEKKAAAEKAKAAKEA 104

Third Src Homology 3 domain (SH3C) of CD2-associated protein; CD2AP, also called CMS (Cas ligand with Multiple SH3 domains) or METS1 (Mesenchyme-to-Epithelium Transition protein with SH3 domains), is a cytosolic adaptor protein that plays a role in regulating the cytoskeleton. It is critical in cell-to-cell union necessary for kidney function. It also stabilizes the contact between a T cell and antigen-presenting cells. It is primarily expressed in podocytes at the cytoplasmic face of the slit diaphragm and serves as a linker anchoring podocin and nephrin to the actin cytoskeleton. CD2AP contains three SH3 domains, a proline-rich region, and a C-terminal coiled-coil domain. All of these domains enable CD2AP to bind various protein partners and assemble complexes that have been implicated in many different functions. This alignment model represents the third SH3 domain (SH3C) of CD2AP. SH3C has been shown to bind ubiquitin. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212989 [Multi-domain] Cd Length: 57 Bit Score: 36.73 E-value: 4.91e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQ---QENWWFGEVHGGRGWFPKSYVKL 934
Cdd:cd12056     5 KALFHYEGTNEDELDFKEGEIILIISKdtgEPGWWKGELNGKEGVFPDNFVSQ 57

Chromatin assembly factor 1 complex p150 subunit, N-terminal; CAF-1_p150 is a polypeptide subunit of CAF-1, which functions in depositing newly synthesized and acetylated histones H3/H4 into chromatin during DNA replication and repair. CAF-1_p150 includes the HP1 interaction site, the PEST, KER and ED interacting sites. CAF-1_p150 interacts directly with newly synthesized and acetylated histones through the acidic KER and ED domains. The PEST domain is associated with proteins that undergo rapid proteolysis.

Pssm-ID: 402959 [Multi-domain] Cd Length: 164 Bit Score: 39.67 E-value: 4.91e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   352 QEEEPQKKLpvtfedKRKANYERGNMELEKRRQVLMEQQQREAERKAQKEKEEWER--KQRELQEQEWKKQLELEKRLEK 429
Cdd:pfam11600   33 AEKEEKERL------KEEAKAEKERAKEEARRKKEEEKELKEKERREKKEKDEKEKaeKLRLKEEKRKEKQEALEAKLEE 106


                   .
gi 312176401   430 Q 430
Cdd:pfam11600  107 K 107

Third Src homology 3 domain of Rab3-interacting molecules (RIMs) binding proteins; RIMs binding proteins (RBPs, RIM-BPs) associate with calcium channels present in photoreceptors, neurons, and hair cells; they interact simultaneously with specific calcium channel subunits, and active zone proteins, RIM1 and RIM2. RIMs are part of the matrix at the presynaptic active zone and are associated with synaptic vesicles through their interaction with the small GTPase Rab3. RIM-BPs play a role in regulating synaptic transmission by serving as adaptors and linking calcium channels with the synaptic vesicle release machinery. RIM-BPs contain three SH3 domains and two to three fibronectin III repeats. Invertebrates contain one, while vertebrates contain at least two RIM-BPs, RIM-BP1 and RIM-BP2. RIM-BP1 is also called peripheral-type benzodiazapine receptor associated protein 1 (PRAX-1). Mammals contain a third protein, RIM-BP3. RIM-BP1 and RIM-BP2 are predominantly expressed in the brain where they display overlapping but distinct expression patterns, while RIM-BP3 is almost exclusively expressed in the testis and is essential in spermiogenesis. The SH3 domains of RIM-BPs bind to the PxxP motifs of RIM1, RIM2, and L-type (alpha1D) and N-type (alpha1B) calcium channel subunits. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212946 Cd Length: 61 Bit Score: 36.97 E-value: 4.91e-03

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  750 YRALYPFEAR----NHD---EMSFSSGDIIQVdEKTVGEPGWLYGSFQGKFGWFPCNYVE 802
Cdd:cd12013     2 MVALFDYDPResspNVDaevELSFRAGDIITV-FGEMDEDGFYYGELNGQRGLVPSNFLE 60

Septal ring factor EnvC, activator of murein hydrolases AmiA and AmiB [Cell cycle control, cell division, chromosome partitioning];

Pssm-ID: 443969 [Multi-domain] Cd Length: 377 Bit Score: 41.29 E-value: 4.92e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  378 ELEKRRQVLMEQ-QQREAERKAQKEKEEWERKQRELQEQewkKQLELEKRLEKQRELERQREEERRKEIERREAAKQELE 456
Cdd:COG4942    24 EAEAELEQLQQEiAELEKELAALKKEEKALLKQLAALER---RIAALARRIRALEQELAALEAELAELEKEIAELRAELE 100

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  457 RQRRLEWERLRRQELLSQKTRE-----QEDIVRLSSRKKSLHLELEAVNGKHQQISGRLQDVQIRKQTQKTELEVLDKQC 531
Cdd:COG4942   101 AQKEELAELLRALYRLGRQPPLalllsPEDFLDAVRRLQYLKYLAPARREQAEELRADLAELAALRAELEAERAELEALL 180

                         170       180       190       200       210       220       230       240
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  532 DLEIMEIKQLQQELKEYQNKLIYLVPEKQLLNERIKNMQlsntpdsgisllhkksseKEElcQRLKEQLDALEKETASKL 611
Cdd:COG4942   181 AELEEERAALEALKAERQKLLARLEKELAELAAELAELQ------------------QEA--EELEALIARLEAEAAAAA 240


                  ....*
gi 312176401  612 SEMDS 616
Cdd:COG4942   241 ERTPA 245

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 36.91 E-value: 4.92e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  884 AQALCSWTAKKENHLNFSKHDVITVLEQ---QENWWFGEVHGGRGWFPKSYVK 933
Cdd:cd11977     3 AVARYNFAARDMRELSLREGDVVRIYSRiggDQGWWKGETNGRIGWFPSTYVE 55

Src homology 3 domain of SH3 protein interacting with Nck, 90 kDa (SPIN90); SPIN90 is also called NCK interacting protein with SH3 domain (NCKIPSD), Dia-interacting protein (DIP), 54 kDa vimentin-interacting protein (VIP54), or WASP-interacting SH3-domain protein (WISH). It is an F-actin binding protein that regulates actin polymerization and endocytosis. It associates with the Arp2/3 complex near actin filaments and determines filament localization at the leading edge of lamellipodia. SPIN90 is expressed in the early stages of neuronal differentiation and plays a role in regulating growth cone dynamics and neurite outgrowth. It also interacts with IRSp53 and regulates cell motility by playing a role in the formation of membrane protrusions. SPIN90 contains an N-terminal SH3 domain, a proline-rich domain, and a C-terminal VCA (verprolin-homology and cofilin-like acidic) domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212783 [Multi-domain] Cd Length: 53 Bit Score: 36.91 E-value: 4.95e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGR-GWFPKSYVK 933
Cdd:cd11849     3 RALYDFKSAEPNTLSFSEGETFLLLERsNAHWWLVTNHSGEtGYVPANYVK 53

N-terminal domain of Kruppel-like factor 3; Kruppel-like factor 3 (KLF3; also called Krueppel-like factor 3 and originally called Basic Kruppel-like Factor/BKLF), was the third member of the KLF family of zinc finger transcription factors to be discovered. KLF3 possesses a wide range of biological impacts on regulating apoptosis, differentiation, and proliferation in various tissues during the entire progression process. It has been proposed as a tumor suppressor in colorectal cancer. It appears to function predominantly as a repressor of transcription, turning genes off by recruiting the C-terminal Binding Protein co-repressors CtBP1 and CtBP2. CtBP docks onto a short motif (residues 61-65) in the N-terminus of KLF3, through the Proline-X-Aspartate-Leucine-Serine (PXDLS) motif. CtBP in turn recruits histone modifying enzymes to alter chromatin and repress gene expression. KLF3 belongs to a family of proteins, called the Specificity Protein (SP)/KLF family, characterized by a C-terminal DNA-binding domain of 81 amino acids consisting of three Kruppel-like C2H2 zinc fingers. These factors bind to a loose consensus motif, namely NNRCRCCYY (where N is any nucleotide; R is A/G, and Y is C/T), such as the recurring motifs in GC and GT boxes (5'-GGGGCGGGG-3' and 5-GGTGTGGGG-3') that are present in promoters and more distal regulatory elements of mammalian genes. Members of the KLF family can act as activators or repressors of transcription depending on cell and promoter context. KLFs regulate various cellular functions, such as proliferation, differentiation, and apoptosis, as well as the development and homeostasis of several types of tissue. In addition to the C-terminal DNA-binding domain, each KLF also has a unique N-terminal activation/repression domain that confers specificity and allows it to bind specifically to a certain partner, leading to distinct activities in vivo. This model represents the N-terminal domain of KLF3.

Pssm-ID: 410554 [Multi-domain] Cd Length: 214 Bit Score: 40.41 E-value: 4.95e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  106 PPMFSPLISARFGMGSMPNLSIHQPLPPVAPIATPLSsatsgtsIPPLMMPAPLVPSVSTSSLPNGTASLIQPLSIPYSS 185
Cdd:cd21577    42 SSSSSSSPSSRASPPSPYSKSSPPSPPQQRPLSPPLS-------LPPPVAPPPLSPGSVPGGLPVISPVMVQPVPVLYPP 114

Second Src Homology 3 domain of FCH and double SH3 domains proteins; This group is composed of FCH and double SH3 domains protein 1 (FCHSD1) and FCHSD2. These proteins have a common domain structure consisting of an N-terminal F-BAR (FES-CIP4 Homology and Bin/Amphiphysin/Rvs), two SH3, and C-terminal proline-rich domains. They have only been characterized in silico and their functions remain unknown. This group also includes the insect protein, nervous wreck, which acts as a regulator of synaptic growth signaling. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212696 [Multi-domain] Cd Length: 57 Bit Score: 36.99 E-value: 5.02e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTS----GWWQGELQARgkkrqKGWFPA 1097
Cdd:cd11762     8 YEAQSDEELSFPEGAIIRILRKDDNgvddGWWEGEFNGR-----VGVFPS 52

Src homology 3 domain of the CAS (Crk-Associated Substrate) scaffolding protein family member, Breast Cancer Anti-estrogen Resistance 1; BCAR1, also called p130cas or CASS1, is the founding member of the CAS family of scaffolding proteins and was originally identified through its ability to associate with Crk. The name BCAR1 was designated because the human gene was identified in a screen for genes that promote resistance to tamoxifen. It is widely expressed and its deletion is lethal in mice. It plays a role in regulating cell motility, survival, proliferation, transformation, cancer progression, and bacterial pathogenesis. CAS proteins function as molecular scaffolds to regulate protein complexes that are involved in many cellular processes. They share a common domain structure that includes an N-terminal SH3 domain, an unstructured substrate domain that contains many YxxP motifs, a serine-rich four-helix bundle, and a FAT-like C-terminal domain. The SH3 domain of CAS proteins binds to diverse partners including FAK, FRNK, Pyk2, PTP-PEST, DOCK180, among others. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212934 Cd Length: 68 Bit Score: 37.33 E-value: 5.27e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQV-DEKTVGEPGWLYGSFQGKFGWFPCN 799
Cdd:cd12001     6 KALYDNVAESPDELSFRKGDIMTVlERDTQGLDGWWLCSLHGRQGIVPGN 55

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 2; SKAP2, also called SKAP55-Related (SKAP55R) or SKAP55 homolog (SKAP-HOM or SKAP55-HOM), is an immune cell-specific adaptor protein that plays an important role in adhesion and migration of B-cells and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), YopH, SHPS1, and HPK1. SKAP2 has also been identified as a substrate for lymphoid-specific tyrosine phosphatase (Lyp), which has been implicated in a wide variety of autoimmune diseases. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. Like SKAP1, SKAP2 is expected to bind primarily to a proline-rich region of ADAP through its SH3 domain; its degradation may be regulated by ADAP. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212978 Cd Length: 53 Bit Score: 36.80 E-value: 5.43e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd12045     2 YQGLWDCTGDQPDELSFKRGDTIYILSKEYNRFGWWVGEMKGTIGLVPKAYI 53

Programmed cell death protein 7;

Pssm-ID: 464979 [Multi-domain] Cd Length: 305 Bit Score: 40.86 E-value: 5.44e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   663 EQLHKIKRdKLKEIERKRLEQIQKKK-LEDEAARKAKQGKE-----NLWRESIRKEEEEKQKRLQEEKSQDKTQEEERK- 735
Cdd:pfam16021   62 ELLESLKR-KLERRQKKRLRRKRRKEeRKEEKKEEQERRAEreakiDKWRRKQIQEVEEKKRERELKLAADAVLSEVRKk 140

                           90       100       110       120
                   ....*....|....*....|....*....|....*....|...
gi 312176401   736 -AEAKQS-ETASALVNYRALypfearnHDEMSFSSGDIIQVDE 776
Cdd:pfam16021  141 qADAKRMlDILRSLEKLRKL-------RKEAARRKGIKPESEC 176

MAP7 (E-MAP-115) family; The organization of microtubules varies with the cell type and is presumably controlled by tissue-specific microtubule-associated proteins (MAPs). The 115-kDa epithelial MAP (E-MAP-115/MAP7) has been identified as a microtubule-stabilising protein predominantly expressed in cell lines of epithelial origin. The binding of this microtubule associated protein is nucleotide independent.

Pssm-ID: 461709 [Multi-domain] Cd Length: 153 Bit Score: 39.25 E-value: 5.56e-03

                           10        20        30        40        50        60
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401   677 ERKRLEQIQKKKLEDEaaRKAKQGKENLWRESIRKEEEEKQKRLQEE----KSQDKTQEEERKAEAKQ 740
Cdd:pfam05672   18 EKRRQAREQREREEQE--RLEKEEEERLRKEELRRRAEEERARREEEarrlEEERRREEEERQRKAEE 83

recombination and DNA strand exchange inhibitor protein; Reviewed

Pssm-ID: 234750 [Multi-domain] Cd Length: 782 Bit Score: 41.35 E-value: 5.63e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  388 EQQQREAE---RKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKQrelerqreeeRRKEIERREAAKQELErQRRLEWE 464
Cdd:PRK00409  526 EELERELEqkaEEAEALLKEAEKLKEELEEKKEKLQEEEDKLLEEA----------EKEAQQAIKEAKKEAD-EIIKELR 594

                          90       100       110       120       130       140       150       160
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  465 RLRRQELLSQKTREQEDIvrlssrKKSLHLELEAVNgKHQQISGRLQD-------VQIRKQTQKTE-LEVLDK---QCDL 533
Cdd:PRK00409  595 QLQKGGYASVKAHELIEA------RKRLNKANEKKE-KKKKKQKEKQEelkvgdeVKYLSLGQKGEvLSIPDDkeaIVQA 667

                         170       180       190       200       210       220       230
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  534 EIMEIKqlqqelkeyqnkliylVPEKQLlnERIKNMQlSNTPDSGISLLHKKSSEKEEL---CQRLKEQLDALEK 605
Cdd:PRK00409  668 GIMKMK----------------VPLSDL--EKIQKPK-KKKKKKPKTVKPKPRTVSLELdlrGMRYEEALERLDK 723

Src Homology 3 domain of the p40phox subunit of NADPH oxidase; p40phox, also called Neutrophil cytosol factor 4 (NCF-4), is a cytosolic subunit of the phagocytic NADPH oxidase complex (also called Nox2 or gp91phox) which plays a crucial role in the cellular response to bacterial infection. NADPH oxidase catalyzes the transfer of electrons from NADPH to oxygen during phagocytosis forming superoxide and reactive oxygen species. p40phox positively regulates NADPH oxidase in both phosphatidylinositol-3-phosphate (PI3P)-dependent and PI3P-independent manner. It contains an N-terminal PX domain, a central SH3 domain, and a C-terminal PB1 domain that interacts with p67phox. The SH3 domain of p40phox binds to canonical polyproline and noncanonical motifs at the C-terminus of p47phox. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212802 Cd Length: 54 Bit Score: 36.70 E-value: 5.68e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  883 KAQALCSWTAKKENHLNFSKHDVITVLEQ-QENWWFGEVHGGRGWFPKSYVKLI 935
Cdd:cd11869     1 RAEALFDFTGNSKLELNFKAGDVIFLLSRvNKDWLEGTVRGATGIFPLSFVKII 54

Synaptonemal complex protein 1 (SCP-1); Synaptonemal complex protein 1 (SCP-1) is the major component of the transverse filaments of the synaptonemal complex. Synaptonemal complexes are structures that are formed between homologous chromosomes during meiotic prophase.

Pssm-ID: 114219 [Multi-domain] Cd Length: 787 Bit Score: 41.25 E-value: 5.96e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   349 QKTQEEEPQKKLPVTFEDKR-KANyergnmELEKRRQVLMEQQQREAERKAQKEKEEWERK---QRELQEQewkKQLELE 424
Cdd:pfam05483  248 QITEKENKMKDLTFLLEESRdKAN------QLEEKTKLQDENLKELIEKKDHLTKELEDIKmslQRSMSTQ---KALEED 318

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   425 KRLEKQRELERQREEERRKEIERREAAKQELErQRRLEWERLRRQELLSQktrEQEDIVRLSSRKKSLHLELeavngkhQ 504
Cdd:pfam05483  319 LQIATKTICQLTEEKEAQMEELNKAKAAHSFV-VTEFEATTCSLEELLRT---EQQRLEKNEDQLKIITMEL-------Q 387

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   505 QISGRLQDVQIRKQTQKTELEVL------DKQCDLEIMEIKQLQQELKEYQNKLIYLvpekqlLNERIKNMQlsntpDSG 578
Cdd:pfam05483  388 KKSSELEEMTKFKNNKEVELEELkkilaeDEKLLDEKKQFEKIAEELKGKEQELIFL------LQAREKEIH-----DLE 456

                          250       260       270       280       290       300       310       320
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   579 ISLLHKKSSEkEELCQRLKEQLDALEKETAsKLSEMDSFNNQLkcgsmddcvLQCLLSLLSCLNNLFLLLKELRESYNTQ 658
Cdd:pfam05483  457 IQLTAIKTSE-EHYLKEVEDLKTELEKEKL-KNIELTAHCDKL---------LLENKELTQEASDMTLELKKHQEDIINC 525

                          330       340       350       360       370       380       390       400
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   659 QLALEQLHKiKRDKLKEIE---RKRLEQIQK--KKLEDEAARKAKQGKENLWRESIRKEEEEKQKRLQEEKSQDKTQEEE 733
Cdd:pfam05483  526 KKQEERMLK-QIENLEEKEmnlRDELESVREefIQKGDEVKCKLDKSEENARSIEYEVLKKEKQMKILENKCNNLKKQIE 604


                   ....
gi 312176401   734 RKAE 737
Cdd:pfam05483  605 NKNK 608

Src homology 3 domain of the Rho guanine nucleotide exchange factors ARHGEF5 and ARHGEF19; ARHGEF5, also called ephexin-3 or TIM (Transforming immortalized mammary oncogene), is a potent activator of RhoA and it plays roles in regulating cell shape, adhesion, and migration. It binds to the SH3 domain of Src and is involved in regulating Src-induced podosome formation. ARHGEF19, also called ephexin-2 or WGEF (weak-similarity GEF), is highly expressed in the intestine, liver, heart and kidney. It activates RhoA, Cdc42, and Rac 1, and has been shown to activate RhoA in the Wnt-PCP (planar cell polarity) pathway. It is involved in the regulation of cell polarity and cytoskeletal reorganization. ARHGEF5 and ARHGEF19 contain RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), and SH3 domains. The SH3 domains of ARHGEFs play an autoinhibitory role through intramolecular interactions with a proline-rich region N-terminal to the DH domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212873 Cd Length: 55 Bit Score: 36.69 E-value: 6.04e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQENWWFGEVH---GGRGWFPKSYVKL 934
Cdd:cd11940     3 QCIRSYKAQENDELTLEKADIIMVRQQSSDGWLEGVRlsdGERGWFPQSHVEE 55

Third Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the third SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212950 Cd Length: 53 Bit Score: 36.66 E-value: 6.10e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1052 YAASGTEQLSLAPGQLILILKKNTSGWWQGELQArgkkrQKGWFPASHV 1100
Cdd:cd12017     8 FQATIQDGISFQKGQKVEVIDKNPSGWWYVKIDG-----KEGWAPSSYI 51

Src homology 3 domain of Brk (Breast tumor kinase) Protein Tyrosine Kinase (PTK), also called PTK6; Brk is a cytoplasmic (or non-receptor) PTK with limited homology to Src kinases. It has been found to be overexpressed in a majority of breast tumors. It plays roles in normal cell differentiation, proliferation, survival, migration, and cell cycle progression. Brk substrates include RNA-binding proteins (SLM-1/2, Sam68), transcription factors (STAT3/5), and signaling molecules (Akt, paxillin, IRS-4). Src kinases in general contain an N-terminal SH4 domain with a myristoylation site, followed by SH3 and SH2 domains, a tyr kinase domain, and a regulatory C-terminal region containing a conserved tyr; they are activated by autophosphorylation at the tyr kinase domain, but are negatively regulated by phosphorylation at the C-terminal tyr by Csk (C-terminal Src Kinase). However, Brk lacks the N-terminal myristoylation site. The SH3 domain of Src kinases contributes to substrate recruitment by binding adaptor proteins/substrates, and regulation of kinase activity through an intramolecular interaction. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212781 [Multi-domain] Cd Length: 58 Bit Score: 36.77 E-value: 6.20e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401 1121 IAMYDYMANNEDELNFSKGQLINVMNKDDpDWWQ----GETNGLT--GLFPSNYV 1169
Cdd:cd11847     3 KALWDFKARGDEELSFQAGDQFRIAERSG-DWWTalklDRAGGVVaqGFVPNNYL 56

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 36.37 E-value: 6.29e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|..
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTVGEPGWLYGSFQGKFGWFPCNYV 801
Cdd:cd12044     2 YQGLWDCFGDNPDELSFQRGDLIYILSKEYNMYGWWVGELNGIVGIVPKDYL 53

C-terminal Src homology 3 domain of Growth factor receptor-bound protein 2 (GRB2) and related proteins; This family includes the adaptor protein GRB2 and related proteins including Drosophila melanogaster Downstream of receptor kinase (DRK), Caenorhabditis elegans Sex muscle abnormal protein 5 (Sem-5), GRB2-related adaptor protein (GRAP), GRAP2, and similar proteins. Family members contain an N-terminal SH3 domain, a central SH2 domain, and a C-terminal SH3 domain. GRB2/Sem-5/DRK is a critical signaling molecule that regulates the Ras pathway by linking tyrosine kinases to the Ras guanine nucleotide releasing protein Sos (son of sevenless), which converts Ras to the active GTP-bound state. GRAP2 plays an important role in T cell receptor (TCR) signaling by promoting the formation of the SLP-76:LAT complex, which couples the TCR to the Ras pathway. GRAP acts as a negative regulator of T cell receptor (TCR)-induced lymphocyte proliferation by downregulating the signaling to the Ras/ERK pathway. The C-terminal SH3 domains (SH3c) of GRB2 and GRAP2 have been shown to bind to classical PxxP motif ligands, as well as to non-classical motifs. GRB2 SH3c binds Gab2 (Grb2-associated binder 2) through epitopes containing RxxK motifs, while the SH3c of GRAP2 binds to the phosphatase-like protein HD-PTP via a RxxxxK motif. SH3 domains are protein interaction domains that typically bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212739 [Multi-domain] Cd Length: 53 Bit Score: 36.45 E-value: 6.46e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*..
gi 312176401 1047 QVTSAYAASGTE--QLSLAPGQLILILKKNTSGWWQGELQARgkkrqKGWFPASHVK 1101
Cdd:cd11805     1 RVQALYDFNPQEpgELEFRRGDIITVLDSSDPDWWKGELRGR-----VGIFPANYVQ 52

EF-hand, calcium binding motif; A diverse superfamily of calcium sensors and calcium signal modulators; most examples in this alignment model have 2 active canonical EF hands. Ca2+ binding induces a conformational change in the EF-hand motif, leading to the activation or inactivation of target proteins. EF-hands tend to occur in pairs or higher copy numbers.

Pssm-ID: 238008 [Multi-domain] Cd Length: 63 Bit Score: 36.76 E-value: 6.96e-03

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 312176401  248 KYRQKFNSLDKGMSGYLSGFQARNAL--LQSNLSQTQLATIWTLADIDGDGQLKAEEFILAMH 308
Cdd:cd00051     1 ELREAFRLFDKDGDGTISADELKAALksLGEGLSEEEIDEMIREVDKDGDGKIDFEEFLELMA 63

Src Homology 3 domain of Class A Dedicator of Cytokinesis proteins 1 and 5; Dock1, also called Dock180, and Dock5 are class A DOCKs and are atypical guanine nucleotide exchange factors (GEFs) that lack the conventional Dbl homology (DH) domain. Dock1 interacts with the scaffold protein Elmo and the resulting complex functions upstream of Rac in many biological events including phagocytosis of apoptotic cells, cell migration and invasion. Dock5 functions upstream of Rac1 to regulate osteoclast function. All DOCKs contain two homology domains: the DHR-1 (Dock homology region-1), also called CZH1 (CED-5, Dock180, and MBC-zizimin homology 1), and DHR-2 (also called CZH2 or Docker). The DHR-1 domain binds phosphatidylinositol-3,4,5-triphosphate while DHR-2 contains the catalytic activity for Rac and/or Cdc42. Class A DOCKs also contain an SH3 domain at the N-terminal region and a PxxP motif at the C-terminus; they are specific GEFs for Rac. The SH3 domain of Dock1 binds to DHR-2 in an autoinhibitory manner; binding of Elmo to the SH3 domain of Dock1 exposes the DHR-2 domain and promotes GEF activity. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212984 [Multi-domain] Cd Length: 56 Bit Score: 36.34 E-value: 7.12e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401 1052 YAASGTEQLSLAPGQLILILKkNTSGWWQGelQARGKKRQKGWFPASHVKL 1102
Cdd:cd12051     8 YDARGPDELSLQIGDTVHILE-TYEGWYRG--YTLRKKSKKGIFPASYIHL 55

Src Homology 3 domain of Melanoma Inhibitory Activity 2 protein; MIA2 is expressed specifically in hepatocytes and its expression is controlled by hepatocyte nuclear factor 1 binding sites in the MIA2 promoter. It inhibits the growth and invasion of hepatocellular carcinomas (HCC) and may act as a tumor suppressor. A mutation in MIA2 in mice resulted in reduced cholesterol and triglycerides. Since MIA2 localizes to ER exit sites, it may function as an ER-to-Golgi trafficking protein that regulates lipid metabolism. MIA2 contains an N-terminal SH3-like domain, similar to MIA. It is a member of the recently identified family that also includes MIA, MIAL, and MIA3 (also called TANGO). MIA is a single domain protein that adopts a SH3 domain-like fold; it contains an additional antiparallel beta sheet and two disulfide bonds compared to classical SH3 domains. Unlike classical SH3 domains, MIA does not bind proline-rich ligands.

Pssm-ID: 212825 Cd Length: 73 Bit Score: 36.74 E-value: 7.38e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*...
gi 312176401 1116 AVCQVIAMYDYMANNEDELNFSKGQLINVMNK---DDPDWWQGETNGLTGLFPSNYVK 1170
Cdd:cd11892    10 LMSRVQAIRDYRGPDCRYLSFKKGDEIIVYYKlsgKREDLWAGSTGKEFGYFPKDAVK 67

Fourth N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP bind the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212731 Cd Length: 50 Bit Score: 36.25 E-value: 7.53e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 312176401 1120 VIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd11797     2 GVALYRFQALEPNELDFEVGDRIRIIATLEDGWLEGELKGRRGIFPHRF 50

Second N-terminal Src homology 3 domain of Dynamin Binding Protein, also called Tuba; DNMBP or Tuba is a cdc42-specific guanine nucleotide exchange factor (GEF) that contains four N-terminal SH3 domains, a central RhoGEF [or Dbl homology (DH)] domain followed by a Bin/Amphiphysin/Rvs (BAR) domain, and two C-terminal SH3 domains. It provides a functional link between dynamin and key regulatory proteins of the actin cytoskeleton. It plays an important role in regulating cell junction configuration. The four N-terminal SH3 domains of DNMBP binds the GTPase dynamin, which plays an important role in the fission of endocytic vesicles. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212729 Cd Length: 54 Bit Score: 36.27 E-value: 7.57e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|...
gi 312176401 1049 TSAYAASGTEQLSLAPGQLILILKKNTSGWwqgeLQARGKKRQKGWFPASHVK 1101
Cdd:cd11795     5 IEAFTSQEPGHLNLQRGDLVELTGTTDSGW----LQGRSCWGSSGFFPSSCVQ 53

Src Homology 3 domain of Sorting Nexin 33; SNX33 interacts with Wiskott-Aldrich syndrome protein (WASP) and plays a role in the maintenance of cell shape and cell cycle progression. It modulates the shedding and endocytosis of cellular prion protein (PrP(c)) and amyloid precursor protein (APP). SNXs are Phox homology (PX) domain containing proteins that are involved in regulating membrane traffic and protein sorting in the endosomal system. SNX33 also contains BAR and SH3 domains. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212829 [Multi-domain] Cd Length: 55 Bit Score: 36.48 E-value: 7.66e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....
gi 312176401  751 RALYPFEARNHDEMSFSSGDIIQV-DEKTVGepGWLYG-SFQGKFGWFPCNYVE 802
Cdd:cd11896     3 RALYSFQSENKEEINIQENEELVIfSENSLD--GWLQGqNSRGETGLFPASYVE 54

Fifth Src homology 3 domain of ADAM-binding protein Eve-1; Eve-1, also called SH3 domain-containing protein 19 (SH3D19) or EEN-binding protein (EBP), exists in multiple alternatively spliced isoforms. The longest isoform contains five SH3 domain in the C-terminal region and seven proline-rich motifs in the N-terminal region. It is abundantly expressed in skeletal muscle and heart, and may be involved in regulating the activity of ADAMs (A disintegrin and metalloproteases). Eve-1 interacts with EEN, an endophilin involved in endocytosis and may be the target of the MLL-EEN fusion protein that is implicated in leukemogenesis. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212752 [Multi-domain] Cd Length: 50 Bit Score: 36.31 E-value: 7.67e-03

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*..
gi 312176401  976 ALYSYSSVEPGDLTFTEGEEIL-VTQKDGEWWTGSIGERTGIFPSNY 1021
Cdd:cd11818     4 ALYDFTGENEDELSFKAGDIITeLESIDEEWMSGELRGKSGIFPKNF 50

RecF/RecN/SMC N terminal domain; This domain is found at the N terminus of SMC proteins. The SMC (structural maintenance of chromosomes) superfamily proteins have ATP-binding domains at the N- and C-termini, and two extended coiled-coil domains separated by a hinge in the middle. The eukaryotic SMC proteins form two kind of heterodimers: the SMC1/SMC3 and the SMC2/SMC4 types. These heterodimers constitute an essential part of higher order complexes, which are involved in chromatin and DNA dynamics. This family also includes the RecF and RecN proteins that are involved in DNA metabolism and recombination.

Pssm-ID: 426784 [Multi-domain] Cd Length: 1161 Bit Score: 41.11 E-value: 7.81e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   651 LRESYN--TQQLALEQLHKIKRDKLKEIERKRLEQIQKKKLEdEAARKAKQGKENLWRESIRKEEEEKQKR---LQEEKS 725
Cdd:pfam02463  131 SPEAYNflVQGGKIEIIAMMKPERRLEIEEEAAGSRLKRKKK-EALKKLIEETENLAELIIDLEELKLQELklkEQAKKA 209

                           90       100
                   ....*....|....*....|....*..
gi 312176401   726 QDKTQEEERKAEAKQSETASALVNYRA 752
Cdd:pfam02463  210 LEYYQLKEKLELEEEYLLYLDYLKLNE 236

Chromatin assembly factor 1 complex p150 subunit, N-terminal; CAF-1_p150 is a polypeptide subunit of CAF-1, which functions in depositing newly synthesized and acetylated histones H3/H4 into chromatin during DNA replication and repair. CAF-1_p150 includes the HP1 interaction site, the PEST, KER and ED interacting sites. CAF-1_p150 interacts directly with newly synthesized and acetylated histones through the acidic KER and ED domains. The PEST domain is associated with proteins that undergo rapid proteolysis.

Pssm-ID: 402959 [Multi-domain] Cd Length: 164 Bit Score: 38.90 E-value: 7.85e-03

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   663 EQLHKIKRDKLKEIERKRLEQIQKKKLEDEAARKAKQGKENLWRESIRKEEEEKQKRlQEEKSQDKTQEEERKAE 737
Cdd:pfam11600   11 EEKEKQRLEKDKERLRRQLKLEAEKEEKERLKEEAKAEKERAKEEARRKKEEEKELK-EKERREKKEKDEKEKAE 84

Src Homology 3 domain of fungal BOI-like proteins; This subfamily includes the Saccharomyces cerevisiae proteins BOI1 and BOI2, and similar proteins. They contain an N-terminal SH3 domain, a Sterile alpha motif (SAM), and a Pleckstrin homology (PH) domain at the C-terminus. BOI1 and BOI2 interact with the SH3 domain of Bem1p, a protein involved in bud formation. They promote polarized cell growth and participates in the NoCut signaling pathway, which is involved in the control of cytokinesis. SH3 domains bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs; they play a role in the regulation of enzymes by intramolecular interactions, changing the subcellular localization of signal pathway components and mediate multiprotein complex assemblies.

Pssm-ID: 212819 Cd Length: 55 Bit Score: 36.16 E-value: 7.86e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQV--DEKTVGEpGWLYGS--FQGKFGWFPCNY 800
Cdd:cd11886     2 LIVIHDFNARSEDELTLKPGDKIELieDDEEFGD-GWYLGRnlRTGETGLFPVVF 55

C2A domain first repeat present in Synaptotagmins 15 and 17; Synaptotagmin is a membrane-trafficking protein characterized by a N-terminal transmembrane region, a linker, and 2 C-terminal C2 domains. It is thought to be involved in the trafficking and exocytosis of secretory vesicles in non-neuronal tissues and is Ca2+ independent. Human synaptotagmin 15 has 2 alternatively spliced forms that encode proteins with different C-termini. The larger, SYT15a, contains a N-terminal TM region, a putative fatty-acylation site, and 2 tandem C terminal C2 domains. The smaller, SYT15b, lacks the C-terminal portion of the second C2 domain. Unlike most other synaptotagmins it is nearly absent in the brain and rather is found in the heart, lungs, skeletal muscle, and testis. Synaptotagmin 17 is located in the brain, kidney, and prostate and is thought to be a peripheral membrane protein. Previously all synaptotagmins were thought to be calcium sensors in the regulation of neurotransmitter release and hormone secretion, but it has been shown that not all of them bind calcium. Of the 17 identified synaptotagmins only 8 bind calcium (1-3, 5-7, 9, 10). The function of the two C2 domains that bind calcium are: regulating the fusion step of synaptic vesicle exocytosis (C2A) and binding to phosphatidyl-inositol-3,4,5-triphosphate (PIP3) in the absence of calcium ions and to phosphatidylinositol bisphosphate (PIP2) in their presence (C2B). C2B also regulates also the recycling step of synaptic vesicles. C2 domains fold into an 8-standed beta-sandwich that can adopt 2 structural arrangements: Type I and Type II, distinguished by a circular permutation involving their N- and C-terminal beta strands. Many C2 domains are Ca2+-dependent membrane-targeting modules that bind a wide variety of substances including bind phospholipids, inositol polyphosphates, and intracellular proteins. Most C2 domain proteins are either signal transduction enzymes that contain a single C2 domain, such as protein kinase C, or membrane trafficking proteins which contain at least two C2 domains, such as synaptotagmin 1. However, there are a few exceptions to this including RIM isoforms and some splice variants of piccolo/aczonin and intersectin which only have a single C2 domain. C2 domains with a calcium binding region have negatively charged residues, primarily aspartates, that serve as ligands for calcium ions. This cd contains the first C2 repeat, C2A, and has a type-I topology.

Pssm-ID: 176036 [Multi-domain] Cd Length: 123 Bit Score: 38.01 E-value: 7.93e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401 1546 YQARSQktsgigRLMVHVIEATELKACKPNGK-SNPYCEVS------MGSQSYTTRtlqDTLNPkwNFNCQFFIKDLYQD 1618
Cdd:cd08390     9 YDLEEE------QLTVSLIKARNLPPRTKDVAhCDPFVKVCllpderRSLQSKVKR---KTQNP--NFDETFVFQVSFKE 77

                          90       100       110
                  ....*....|....*....|....*....|
gi 312176401 1619 V----LCLTMFDRDQFSPDDFLGRTEVPVA 1644
Cdd:cd08390    78 LqrrtLRLSVYDVDRFSRHCIIGHVLFPLK 107

Saccharomyces cerevisiae mitochondrial small ribosomal subunit protein mS26 and similar proteins; mS26, also known as mitochondrial 37S ribosomal protein PET12, is a component of the mitochondrial small ribosomal subunit (mt-SSU) of Saccharomyces cerevisiae mitochondrial ribosome (mitoribosome), a dedicated translation machinery responsible for the synthesis of mitochondrial genome-encoded proteins, including at least some of the essential transmembrane subunits of the mitochondrial respiratory chain. The mitoribosomes are attached to the mitochondrial inner membrane and translation products are cotranslationally integrated into the membrane. The family also includes a group of uncharacterized proteins from pezizomycotina, which show high sequence similarity with mS26.

Pssm-ID: 467916 [Multi-domain] Cd Length: 179 Bit Score: 39.07 E-value: 7.95e-03

                          10        20        30        40        50        60        70
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|..
gi 312176401  676 IERKRLEQIQKKKLEDEAARKAKQG---KENLwRESIRKEEEEKQKR--LQEEKSQDKTQEEERKAEAKQSE 742
Cdd:cd23703    32 TPEPKKEPKPKSPLSEYQEWKRKMAelrRQNL-REGLRELEERKLKTeeLRAKRSERKQAERERALNAPERE 102

Second or C-terminal Src homology 3 domain of NADPH oxidase (Nox) Organizing protein 1; Nox Organizing protein 1 (NoxO1) is a critical regulator of enzyme kinetics of the nonphagocytic NADPH oxidase Nox1, which catalyzes the transfer of electrons from NADPH to molecular oxygen to form superoxide. Nox1 is expressed in colon, stomach, uterus, prostate, and vascular smooth muscle cells. NoxO1 is involved in targeting activator subunits (such as NoxA1) to Nox1. It is co-localized with Nox1 in the membranes of resting cells and directs the subcellular localization of Nox1. NoxO1 contains an N-terminal Phox homology (PX) domain, tandem SH3 domains (N-SH3 and C-SH3), and a C-terminal proline-rich region (PRR). This model characterizes the second SH3 domain (or C-SH3) of NoxO1. The tandem SH3 domains of NoxO1 interact with the PRR of p22phox, which also complexes with Nox1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212957 Cd Length: 53 Bit Score: 36.16 E-value: 8.13e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  750 YRALYPFEARNHDEMSFSSGDIIQVDEKTvgEPGWLYGSFQGKFGWFPCNY 800
Cdd:cd12024     2 YYATRAYEAQKEDELSVPAGVVVEVLQKS--DNGWWLIRYNGRAGYVPSMY 50

Src Homology 3 domain of Src Kinase-Associated Phosphoprotein 1; SKAP1, also called SKAP55 (Src kinase-associated protein of 55kDa), is an immune cell-specific adaptor protein that plays an important role in T-cell adhesion, migration, and integrin clustering. It is expressed exclusively in T-lymphocytes, mast cells, and macrophages. Binding partners include ADAP (adhesion and degranulation-promoting adaptor protein), Fyn, Riam, RapL, and RasGRP. It contains a pleckstrin homology (PH) domain, a C-terminal SH3 domain, and several tyrosine phosphorylation sites. The SH3 domain of SKAP1 is necessary for its ability to regulate T-cell conjugation with antigen-presenting cells and the formation of LFA-1 clusters. SKAP1 binds primarily to a proline-rich region of ADAP through its SH3 domain; its degradation is regulated by ADAP. A secondary interaction occurs via the ADAP SH3 domain and the RKxxYxxY motif in SKAP1. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212977 Cd Length: 53 Bit Score: 35.99 E-value: 8.29e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  885 QALCSWTAKKENHLNFSKHDVITVLEQQEN---WWFGEVHGGRGWFPKSYV 932
Cdd:cd12044     3 QGLWDCFGDNPDELSFQRGDLIYILSKEYNmygWWVGELNGIVGIVPKDYL 53

chromosome segregation protein SMC, common bacterial type; SMC (structural maintenance of chromosomes) proteins bind DNA and act in organizing and segregating chromosomes for partition. SMC proteins are found in bacteria, archaea, and eukaryotes. This family represents the SMC protein of most bacteria. The smc gene is often associated with scpB (TIGR00281) and scpA genes, where scp stands for segregation and condensation protein. SMC was shown (in Caulobacter crescentus) to be induced early in S phase but present and bound to DNA throughout the cell cycle. [Cellular processes, Cell division, DNA metabolism, Chromosome-associated proteins]

Pssm-ID: 274008 [Multi-domain] Cd Length: 1179 Bit Score: 40.81 E-value: 8.72e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   336 KQVDSVNGTLPSYQKTQEEEPQKKLpvtfEDKRKANyergnmELEKRRQVLMEQQQREAER--KAQKEKEEWERKQRELQ 413
Cdd:TIGR02168  309 ERLANLERQLEELEAQLEELESKLD----ELAEELA------ELEEKLEELKEELESLEAEleELEAELEELESRLEELE 378

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   414 EQ---------EWKKQLELEK----RLEKQRELERQREEERRKEIERREAAKQELERQRRLEWERLRRQELLSQKTREQE 480
Cdd:TIGR02168  379 EQletlrskvaQLELQIASLNneieRLEARLERLEDRRERLQQEIEELLKKLEEAELKELQAELEELEEELEELQEELER 458

                          170       180       190       200       210       220
                   ....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   481 DIVRLSSRKKSLHL---ELEAVNGKHQQISGR---LQDVQIRKQT-QKTELEVLDKQCDL 533
Cdd:TIGR02168  459 LEEALEELREELEEaeqALDAAERELAQLQARldsLERLQENLEGfSEGVKALLKNQSGL 518

Borrelia P83/100 protein; This family consists of several Borrelia P83/P100 antigen proteins.

Pssm-ID: 114011 [Multi-domain] Cd Length: 489 Bit Score: 40.76 E-value: 8.73e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   379 LEKRRQV--LMEQQQREAERKAQKEKEEWERKQRELQEQEWKKQLElEKRLEKQRELERQREEE----------RRKEIE 446
Cdd:pfam05262  194 VNFRRDMtdLKERESQEDAKRAQQLKEELDKKQIDADKAQQKADFA-QDNADKQRDEVRQKQQEaknlpkpadtSSPKED 272

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   447 RREAAKQELERQRRLEWERLRRQELLSQKTREQEDIVR--LSSRKKSLHLELEAvNGKHQQISGRLQDVQIRKQTQKTE- 523
Cdd:pfam05262  273 KQVAENQKREIEKAQIEIKKNDEEALKAKDHKAFDLKQesKASEKEAEDKELEA-QKKREPVAEDLQKTKPQVEAQPTSl 351

                          170       180       190       200       210
                   ....*....|....*....|....*....|....*....|....*....|....*
gi 312176401   524 -------------LEVLDKQCDLEIMEIKQLQQE-------LKEYQNKLIYLVPE 558
Cdd:pfam05262  352 nedaidssnpvygLKVVDPITNLSELVLIDLKTEvrlresaQQTIRRRGLYEREK 406

First Src homology 3 domain of Tyrosine kinase substrate (Tks) proteins; Tks proteins are Src substrates and scaffolding proteins that play important roles in the formation of podosomes and invadopodia, the dynamic actin-rich structures that are related to cell migration and cancer cell invasion. Vertebrates contain two Tks proteins, Tks4 (Tyr kinase substrate with four SH3 domains) and Tks5 (Tyr kinase substrate with five SH3 domains), which display partially overlapping but non-redundant functions. Both associate with the ADAMs family of transmembrane metalloproteases, which function as sheddases and mediators of cell and matrix interactions. Tks5 interacts with N-WASP and Nck, while Tks4 is essential for the localization of MT1-MMP (membrane-type 1 matrix metalloproteinase) to invadopodia. Tks proteins contain an N-terminal Phox homology (PX) domain and four or five SH3 domains. This model characterizes the first SH3 domain of Tks proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212948 Cd Length: 53 Bit Score: 35.86 E-value: 8.82e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|
gi 312176401 1119 QVIAMYDYMANNEDELNFSKGQLINVMNKDDPDWWQGETNGLTGLFPSNY 1168
Cdd:cd12015     1 QYVVVADYKKQQPNEISLRAGDVVDVIEKNENGWWFVSLEDEQGWVPATY 50

calmodulin; Provisional

Pssm-ID: 185504 [Multi-domain] Cd Length: 149 Bit Score: 38.59 E-value: 8.82e-03

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|..
gi 312176401  248 KYRQKFNSLDKGMSGYLSGFQARNAL--LQSNLSQTQLATIWTLADIDGDGQLKAEEFILAM 307
Cdd:PTZ00184   85 EIKEAFKVFDRDGNGFISAAELRHVMtnLGEKLTDEEVDEMIREADVDGDGQINYEEFVKMM 146

Src Homology 3 domain of Calcium/calmodulin-dependent Serine protein Kinase; CASK is a scaffolding protein that is highly expressed in the mammalian nervous system and plays roles in synaptic protein targeting, neural development, and gene expression regulation. CASK interacts with many different binding partners including parkin, neurexin, syndecans, calcium channel proteins, caskin, among others, to perform specific functions in different subcellular locations. Disruption of the CASK gene in mice results in neonatal lethality while mutations in the human gene have been associated with X-linked mental retardation. Drosophila CASK is associated with both pre- and postsynaptic membranes and is crucial in synaptic transmission and vesicle cycling. CASK contains an N-terminal calmodulin-dependent kinase (CaMK)-like domain, two L27 domains, followed by the core of three domains characteristic of MAGUK (membrane-associated guanylate kinase) proteins: PDZ, SH3, and guanylate kinase (GuK). In addition, it also contains the Hook (Protein 4.1 Binding) motif in between the SH3 and GuK domains. The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 213014 Cd Length: 62 Bit Score: 36.42 E-value: 8.82e-03

                          10        20        30
                  ....*....|....*....|....*....|....*..
gi 312176401 1134 LNFSKGQLINVMNKDDPDWWQGE----TNGLTGLFPS 1166
Cdd:cd12081    23 IRFRVGDILQIISKDDHNWWQAKlensKNGTAGLIPS 59

phosphodiesterase; Provisional

Pssm-ID: 237177 [Multi-domain] Cd Length: 520 Bit Score: 40.53 E-value: 8.85e-03

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401  648 LKELRESYNTQQLALEQLHKIKRDKLKEIErKRLEQiQKKKLEDEAarkakqgkenlwrESIRKEEEEKQKRLQE-EKSQ 726
Cdd:PRK12704   59 LLEAKEEIHKLRNEFEKELRERRNELQKLE-KRLLQ-KEENLDRKL-------------ELLEKREEELEKKEKElEQKQ 123

                          90       100       110
                  ....*....|....*....|....*....|....
gi 312176401  727 DKTQEEERKAEAKQSETASALVNYRALYPFEARN 760
Cdd:PRK12704  124 QELEKKEEELEELIEEQLQELERISGLTAEEAKE 157

C-terminal (or second) Src homology 3 domain of VAV2 protein; VAV2 is widely expressed and functions as a guanine nucleotide exchange factor (GEF) for RhoA, RhoB and RhoG and also activates Rac1 and Cdc42. It is implicated in many cellular and physiological functions including blood pressure control, eye development, neurite outgrowth and branching, EGFR endocytosis and degradation, and cell cluster morphology, among others. It has been reported to associate with Nek3. VAV proteins contain several domains that enable their function: N-terminal calponin homology (CH), acidic, RhoGEF (also called Dbl-homologous or DH), Pleckstrin Homology (PH), C1 (zinc finger), SH2, and two SH3 domains. The SH3 domain of VAV is involved in the localization of proteins to specific sites within the cell, by interacting with proline-rich sequences within target proteins. SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

Pssm-ID: 212910 [Multi-domain] Cd Length: 58 Bit Score: 36.14 E-value: 9.91e-03

                          10        20        30        40        50
                  ....*....|....*....|....*....|....*....|....*....|.
gi 312176401  975 IALYSYSSVEPGDLTFTEGEEILVTQK---DGEWWTGSIGERTGIFPSNYV 1022
Cdd:cd11977     4 VARYNFAARDMRELSLREGDVVRIYSRiggDQGWWKGETNGRIGWFPSTYV 54

Hyaluronan mediated motility receptor N-terminal; HMMR_N is the N-terminal region of eukaryotic hyaluronan-mediated motility receptor proteins. The protein is functionally associated with BRCA1 and thus predicted to be a common, low-penetrance breast cancer candidate.

Pssm-ID: 464932 [Multi-domain] Cd Length: 329 Bit Score: 40.18 E-value: 9.96e-03

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   388 EQQQREAERKAQKEKEEWERKQRELQEQEWKKQLELEKRLEKqrelERQREEERRKEIERREAAKQELERQrrlEWERLR 467
Cdd:pfam15905   64 KSQKNLKESKDQKELEKEIRALVQERGEQDKRLQALEEELEK----VEAKLNAAVREKTSLSASVASLEKQ---LLELTR 136

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   468 RQELLSQKTRE---QEDIVRLSSRKKSLHLELEA----VNGKHQQISGRLQDVQ------------IRKQTQKTELEVLD 528
Cdd:pfam15905  137 VNELLKAKFSEdgtQKKMSSLSMELMKLRNKLEAkmkeVMAKQEGMEGKLQVTQknlehskgkvaqLEEKLVSTEKEKIE 216

                          170       180       190       200       210       220       230       240
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 312176401   529 KQCDLE-----IMEIKQLQQELKEYQNKLIYLvpeKQLLNERIKNMQ-LSNTPDSGISLLHKKSSEKEELCQRLKEQLDA 602
Cdd:pfam15905  217 EKSETEklleyITELSCVSEQVEKYKLDIAQL---EELLKEKNDEIEsLKQSLEEKEQELSKQIKDLNEKCKLLESEKEE 293

                          250       260       270
                   ....*....|....*....|....*....|....
gi 312176401   603 LEKETASK----LSEMDSFNNQLKCGSMDDCVLQ 632
Cdd:pfam15905  294 LLREYEEKeqtlNAELEELKEKLTLEEQEHQKLQ 327