The Bin/Amphiphysin/Rvs (BAR) domain of ArfGAP with SH3 domain, ANK repeat and PH domain containing protein 3; BAR domains are dimerization, lipid binding and curvature sensing modules found in many different proteins with diverse functions. ASAP3 (ArfGAP with SH3 domain, ANK repeat and PH domain containing protein 3) is also known as ACAP4 (ArfGAP with Coiled-coil, ANK repeat and PH domain containing protein 4), DDEFL1 (Development and Differentiation Enhancing Factor-Like 1), or centaurin beta-6. It is an Arf6-specific GTPase activating protein (GAP) and is co-localized with Arf6 in ruffling membranes upon EGF stimulation. ASAP3 is implicated in the pathogenesis of hepatocellular carcinoma and plays a role in regulating cell migration and invasion. ASAP3 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. BAR domains form dimers that bind to membranes, induce membrane bending and curvature, and may also be involved in protein-protein interactions. The BAR domain of the related protein ASAP1 mediates membrane bending, is essential for function, and autoinhibits GAP activity by interacting with the PH and/or Arf GAP domains.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540  35 RGAALAREEILEGDQAILQRIKKAVRAIHSSGLGHVENEEQYREAVESLGNSHLSQNSHELSTGFLNLAVFTREVAALFK 114
Cdd:cd07640   1 RSTAAALEESLEGDQASLQRIKKIVKAIHNSGLNHVENEEQYTEALENLGNSHLSQNNHELSTGFLNLAVFTREVTALFK 80

                        90       100       110       120       130       140       150       160
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 115 NLIQNLNNIVSFPLDSLMKGQLRDGRQDSKKQLEKAWKDYEAKMAKLEKERDRARVTGGI----PGEVAQDMQRERRIFQ 190
Cdd:cd07640  81 NLVQNLNNIVSFPLDSLLKGQLRDGRLESKKQMEKAWKDYEAKIGKLEKERREKQKQHGLirldMTDTAEDMQRERRNFQ 160

                       170       180       190       200       210
                ....*....|....*....|....*....|....*....|....*....|...
gi 19923540 191 LHMCEYLLKAGESQMKQGPDFLQSLIKFFHAQHNFFQDGWKAAQSLFPFIEKL 243
Cdd:cd07640 161 LHMCEYLLKAQESQMKQGPDFLQSLIKFFHAQHNFFQDGWKAAQNLGPFIEKL 213

ArfGAP with SH3 domain, ankyrin repeat and PH domain Pleckstrin homology (PH) domain; ASAPs (ASAP1, ASAP2, and ASAP3) function as an Arf-specific GAPs, participates in rhodopsin trafficking, is associated with tumor cell metastasis, modulates phagocytosis, promotes cell proliferation, facilitates vesicle budding, Golgi exocytosis, and regulates vesicle coat assembly via a Bin/Amphiphysin/Rvs domain. ASAPs contain an NH2-terminal BAR domain, a tandem PH domain/GAP domain, three ankyrin repeats, two proline-rich regions, and a COOH-terminal Src homology 3 (SH3) 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.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 294 QHQGNKQFGTEKVGFLYKKSDG-IRRVWQKRKCGVKYGCLTISHSTINRPPVKLTLLTCQVRPNPEEKKCFDLVTHNRTY 372
Cdd:cd13251   1 QQQGNKSHGTEKSGYLLKKSEGkIRKVWQKRRCSIKDGFLTISHADENKPPAKLNLLTCQVKLVPEDKKCFDLISHNRTY 80

                        90       100
                ....*....|....*....|....*...
gi 19923540 373 HFQAEDEHECEAWVSVLQNSKDEALSSA 400
Cdd:cd13251  81 HFQAEDENDANAWMSVLKNSKEQALNKA 108

Metaviral_G glycoprotein; This is a viral attachment glycoprotein from region G of metaviruses. It is high in serine and threonine suggesting it is highly glycosylated.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540   720 HWASGRLDISNKTYETVASL------GAATPQGESEDCPPPLPVKNSSRTL------VQGCARHASGDRSEVSSLSSEAP 787
Cdd:pfam09595  30 HASLILIGESNKEAALIITDiidiniNKQHPEQEHHENPPLNEAAKEAPSEsedapdIDPNNQHPSQDRSEAPPLEPAAK 109

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 19923540   788 ETPESLGSPASSSSLMSPLEPgDPSQAPPNSEEGLREPPGTSRPSLTSGTTPSEmylPVRFSSESTRS 855
Cdd:pfam09595 110 TKPSEHEPANPPDASNRLSPP-DASTAAIREARTFRKPSTGKRNNPSSAQSDQS---PPRANHEAIGR 173

The Bin/Amphiphysin/Rvs (BAR) domain of ArfGAP with SH3 domain, ANK repeat and PH domain containing protein 3; BAR domains are dimerization, lipid binding and curvature sensing modules found in many different proteins with diverse functions. ASAP3 (ArfGAP with SH3 domain, ANK repeat and PH domain containing protein 3) is also known as ACAP4 (ArfGAP with Coiled-coil, ANK repeat and PH domain containing protein 4), DDEFL1 (Development and Differentiation Enhancing Factor-Like 1), or centaurin beta-6. It is an Arf6-specific GTPase activating protein (GAP) and is co-localized with Arf6 in ruffling membranes upon EGF stimulation. ASAP3 is implicated in the pathogenesis of hepatocellular carcinoma and plays a role in regulating cell migration and invasion. ASAP3 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. BAR domains form dimers that bind to membranes, induce membrane bending and curvature, and may also be involved in protein-protein interactions. The BAR domain of the related protein ASAP1 mediates membrane bending, is essential for function, and autoinhibits GAP activity by interacting with the PH and/or Arf GAP domains.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540  35 RGAALAREEILEGDQAILQRIKKAVRAIHSSGLGHVENEEQYREAVESLGNSHLSQNSHELSTGFLNLAVFTREVAALFK 114
Cdd:cd07640   1 RSTAAALEESLEGDQASLQRIKKIVKAIHNSGLNHVENEEQYTEALENLGNSHLSQNNHELSTGFLNLAVFTREVTALFK 80

                        90       100       110       120       130       140       150       160
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 115 NLIQNLNNIVSFPLDSLMKGQLRDGRQDSKKQLEKAWKDYEAKMAKLEKERDRARVTGGI----PGEVAQDMQRERRIFQ 190
Cdd:cd07640  81 NLVQNLNNIVSFPLDSLLKGQLRDGRLESKKQMEKAWKDYEAKIGKLEKERREKQKQHGLirldMTDTAEDMQRERRNFQ 160

                       170       180       190       200       210
                ....*....|....*....|....*....|....*....|....*....|...
gi 19923540 191 LHMCEYLLKAGESQMKQGPDFLQSLIKFFHAQHNFFQDGWKAAQSLFPFIEKL 243
Cdd:cd07640 161 LHMCEYLLKAQESQMKQGPDFLQSLIKFFHAQHNFFQDGWKAAQNLGPFIEKL 213

ArfGAP with SH3 domain, ankyrin repeat and PH domain Pleckstrin homology (PH) domain; ASAPs (ASAP1, ASAP2, and ASAP3) function as an Arf-specific GAPs, participates in rhodopsin trafficking, is associated with tumor cell metastasis, modulates phagocytosis, promotes cell proliferation, facilitates vesicle budding, Golgi exocytosis, and regulates vesicle coat assembly via a Bin/Amphiphysin/Rvs domain. ASAPs contain an NH2-terminal BAR domain, a tandem PH domain/GAP domain, three ankyrin repeats, two proline-rich regions, and a COOH-terminal Src homology 3 (SH3) 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.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 294 QHQGNKQFGTEKVGFLYKKSDG-IRRVWQKRKCGVKYGCLTISHSTINRPPVKLTLLTCQVRPNPEEKKCFDLVTHNRTY 372
Cdd:cd13251   1 QQQGNKSHGTEKSGYLLKKSEGkIRKVWQKRRCSIKDGFLTISHADENKPPAKLNLLTCQVKLVPEDKKCFDLISHNRTY 80

                        90       100
                ....*....|....*....|....*...
gi 19923540 373 HFQAEDEHECEAWVSVLQNSKDEALSSA 400
Cdd:cd13251  81 HFQAEDENDANAWMSVLKNSKEQALNKA 108

Putative GTP-ase activating proteins for the small GTPase, ARF; Putative zinc fingers with GTPase activating proteins (GAPs) towards the small GTPase, Arf. The GAP of ARD1 stimulates GTPase hydrolysis for ARD1 but not ARFs.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540    429 IAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNEVMEA 508
Cdd:smart00105   1 LKLLRSIPGNKKCFDCGAPNPTWASVNLGVFLCIECSGIHRSLGVHISKVRSLTLDTWTEEELRLLQKGGNENANSIWES 80

                           90       100       110
                   ....*....|....*....|....*....|...
gi 19923540    509 QLpsHGGPKPSAESDMGTRRD-YIMAKYVEHRF 540
Cdd:smart00105  81 NL--DDFSLKPPDDDDQQKYEsFIAAKYEEKLF 111

Ankyrin repeat [Signal transduction mechanisms];

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 590 LHLAVKVANqasLPLVDFIIQNGGHLDAKAADGNTALHYAALYNQPDCLKLLLKGRALVGTVNEAGETALDIARKKHHKE 669
Cdd:COG0666 157 LHLAAANGN---LEIVKLLLEAGADVNARDNDGETPLHLAAENGHLEIVKLLLEAGADVNAKDNDGKTALDLAAENGNLE 233

                        90
                ....*....|
gi 19923540 670 CEELLEQAQA 679
Cdd:COG0666 234 IVKLLLEAGA 243

Pleckstrin homology domain; Domain commonly found in eukaryotic signalling proteins. The domain family possesses multiple functions including the abilities to bind inositol phosphates, and various proteins. PH domains have been found to possess inserted domains (such as in PLC gamma, syntrophins) and to be inserted within other domains. Mutations in Brutons tyrosine kinase (Btk) within its PH domain cause X-linked agammaglobulinaemia (XLA) in patients. Point mutations cluster into the positively charged end of the molecule around the predicted binding site for phosphatidylinositol lipids.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540    303 TEKVGFLYKKSDGIRRVWQKRKCGVKYGCLTISHS----TINRPPVKLTLLTCQVRPNPE-----EKKCFDLVTHNR-TY 372
Cdd:smart00233   1 VIKEGWLYKKSGGGKKSWKKRYFVLFNSTLLYYKSkkdkKSYKPKGSIDLSGCTVREAPDpdsskKPHCFEIKTSDRkTL 80

                           90
                   ....*....|....*...
gi 19923540    373 HFQAEDEHECEAWVSVLQ 390
Cdd:smart00233  81 LLQAESEEEREKWVEALR 98

ADP-ribosylation factor GTPase-activating protein AGD10; Provisional

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....
gi 19923540  431 EVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGN 499
Cdd:PLN03114  15 KLKAKSDNKICFDCNAKNPTWASVTYGIFLCIDCSAVHRSLGVHISFVRSTNLDSWSSEQLKMMIYGGN 83

ankyrin repeat protein; Provisional

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540  590 LHLAVKVaNQASLPLVDFIIQNGGHLDAK--------------AAD--GNTALHYAALYNQPDCLKLLLKGRALVGTVNE 653
Cdd:PHA03100 145 LHLYLES-NKIDLKILKLLIDKGVDINAKnrvnyllsygvpinIKDvyGFTPLHYAVYNNNPEFVKYLLDLGANPNLVNK 223

                         90       100
                 ....*....|....*....|.
gi 19923540  654 AGETALDIARKKHHKECEELL 674
Cdd:PHA03100 224 YGDTPLHIAILNNNKEIFKLL 244

Metaviral_G glycoprotein; This is a viral attachment glycoprotein from region G of metaviruses. It is high in serine and threonine suggesting it is highly glycosylated.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540   720 HWASGRLDISNKTYETVASL------GAATPQGESEDCPPPLPVKNSSRTL------VQGCARHASGDRSEVSSLSSEAP 787
Cdd:pfam09595  30 HASLILIGESNKEAALIITDiidiniNKQHPEQEHHENPPLNEAAKEAPSEsedapdIDPNNQHPSQDRSEAPPLEPAAK 109

                          90       100       110       120       130       140
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*...
gi 19923540   788 ETPESLGSPASSSSLMSPLEPgDPSQAPPNSEEGLREPPGTSRPSLTSGTTPSEmylPVRFSSESTRS 855
Cdd:pfam09595 110 TKPSEHEPANPPDASNRLSPP-DASTAAIREARTFRKPSTGKRNNPSSAQSDQS---PPRANHEAIGR 173

The Bin/Amphiphysin/Rvs (BAR) domain of ArfGAP with SH3 domain, ANK repeat and PH domain containing protein 3; BAR domains are dimerization, lipid binding and curvature sensing modules found in many different proteins with diverse functions. ASAP3 (ArfGAP with SH3 domain, ANK repeat and PH domain containing protein 3) is also known as ACAP4 (ArfGAP with Coiled-coil, ANK repeat and PH domain containing protein 4), DDEFL1 (Development and Differentiation Enhancing Factor-Like 1), or centaurin beta-6. It is an Arf6-specific GTPase activating protein (GAP) and is co-localized with Arf6 in ruffling membranes upon EGF stimulation. ASAP3 is implicated in the pathogenesis of hepatocellular carcinoma and plays a role in regulating cell migration and invasion. ASAP3 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. BAR domains form dimers that bind to membranes, induce membrane bending and curvature, and may also be involved in protein-protein interactions. The BAR domain of the related protein ASAP1 mediates membrane bending, is essential for function, and autoinhibits GAP activity by interacting with the PH and/or Arf GAP domains.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540  35 RGAALAREEILEGDQAILQRIKKAVRAIHSSGLGHVENEEQYREAVESLGNSHLSQNSHELSTGFLNLAVFTREVAALFK 114
Cdd:cd07640   1 RSTAAALEESLEGDQASLQRIKKIVKAIHNSGLNHVENEEQYTEALENLGNSHLSQNNHELSTGFLNLAVFTREVTALFK 80

                        90       100       110       120       130       140       150       160
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 115 NLIQNLNNIVSFPLDSLMKGQLRDGRQDSKKQLEKAWKDYEAKMAKLEKERDRARVTGGI----PGEVAQDMQRERRIFQ 190
Cdd:cd07640  81 NLVQNLNNIVSFPLDSLLKGQLRDGRLESKKQMEKAWKDYEAKIGKLEKERREKQKQHGLirldMTDTAEDMQRERRNFQ 160

                       170       180       190       200       210
                ....*....|....*....|....*....|....*....|....*....|...
gi 19923540 191 LHMCEYLLKAGESQMKQGPDFLQSLIKFFHAQHNFFQDGWKAAQSLFPFIEKL 243
Cdd:cd07640 161 LHMCEYLLKAQESQMKQGPDFLQSLIKFFHAQHNFFQDGWKAAQNLGPFIEKL 213

ArfGAP domain of ASAP3 (ArfGAP with ANK repeat and PH domain-containing protein 3); The ArfGAPs are a family of multidomain proteins with a common catalytic domain that promotes the hydrolysis of GTP bound to Arf, thereby inactivating Arf signaling. ASAP-subfamily GAPs include three members: ASAP1, ASAP2, ASAP3. The ASAP subfamily comprises Arf GAP, SH3, ANK repeat and PH domains. From the N-terminus, each member has a BAR, PH, Arf GAP, ANK repeat, and proline rich domains. Unlike ASAP1 and ASAP2, ASAP3 do not have an SH3 domain at the C-terminus. ASAP1 and ASAP2 show strong GTPase-activating protein (GAP) activity toward Arf1 and Arf5 and weak activity toward Arf6. ASAP1 is a target of Src and FAK signaling that regulates focal adhesions, circular dorsal ruffles (CDR), invadopodia, and podosomes. ASAP1 GAP activity is synergistically stimulated by phosphatidylinositol 4,5-bisphosphate (PIP2) and phosphatidic acid. ASAP2 is believed to function as an ArfGAP that controls ARF-mediated vesicle budding when recruited to Golgi membranes. It also functions as a substrate and downstream target for protein tyrosine kinases Pyk2 and Src, a pathway that may be involved in the regulation of vesicular transport. ASAP3 is a focal adhesion-associated ArfGAP that functions in cell migration and invasion. Similar to ASAP1, the GAP activity of ASAP3 is strongly enhanced by PIP2 via PH domain. Like ASAP1, ASAP3 associates with focal adhesions and circular dorsal ruffles. However, unlike ASAP1, ASAP3 does not localize to invadopodia or podosomes. ASAP 1 and 3 have been implicated in oncogenesis, as ASAP1 is highly expressed in metastatic breast cancer and ASAP3 in hepatocellular carcinoma.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 424 LTKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFN 503
Cdd:cd17900   1 LTKLLIAEVKSRPGNSQCCDCGAPDPTWLSTNLGILTCIECSGIHRELGVRYSRIQSLTLDLLSTSELLLAVSMGNTRFN 80

                        90       100       110       120
                ....*....|....*....|....*....|....*....|....
gi 19923540 504 EVMEAQLPSHGGPKPSAESDMGTRRDYIMAKYVEHRFAR-RCTP 546
Cdd:cd17900  81 EVMEATLPAHGGPKPSAESDMGTRKDYIMAKYVEHRFVRkRCTP 124

ArfGAP domain of ASAP (Arf GAP, SH3, ANK repeat and PH domains) subfamily of ADP-ribosylation factor GTPase-activating proteins; The ArfGAPs are a family of multidomain proteins with a common catalytic domain that promotes the hydrolysis of GTP bound to Arf, thereby inactivating Arf signaling. ASAP-subfamily GAPs include three members: ASAP1, ASAP2, ASAP3. The ASAP subfamily comprises Arf GAP, SH3, ANK repeat and PH domains. From the N-terminus, each member has a BAR, PH, Arf GAP, ANK repeat, and proline rich domains. Unlike ASAP3, ASAP1 and ASAP2 also have an SH3 domain at the C-terminus. ASAP1 and ASAP2 show strong GTPase-activating protein (GAP) activity toward Arf1 and Arf5 and weak activity toward Arf6. ASAP1 is a target of Src and FAK signaling that regulates focal adhesions, circular dorsal ruffles (CDR), invadopodia, and podosomes. ASAP1 GAP activity is synergistically stimulated by phosphatidylinositol 4,5-bisphosphate (PIP2) and phosphatidic acid. ASAP2 is believed to function as an ArfGAP that controls ARF-mediated vesicle budding when recruited to Golgi membranes. It also functions as a substrate and downstream target for protein tyrosine kinases Pyk2 and Src, a pathway that may be involved in the regulation of vesicular transport. ASAP3 is a focal adhesion-associated ArfGAP that functions in cell migration and invasion. Similar to ASAP1, the GAP activity of ASAP3 is strongly enhanced by PIP2 via PH domain. Like ASAP1, ASAP3 associates with focal adhesions and circular dorsal ruffles. However, unlike ASAP1, ASAP3 does not localize to invadopodia or podosomes. Both ASAP 1 and 3 have been implicated in oncogenesis, as ASAP1 is highly expressed in metastatic breast cancer and ASAP3 in hepatocellular carcinoma.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 424 LTKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFN 503
Cdd:cd08834   1 LTKSIIAEVKRLPGNDVCCDCGSPDPTWLSTNLGILTCIECSGVHRELGVHVSRIQSLTLDNLGTSELLLARNLGNEGFN 80

                        90       100       110
                ....*....|....*....|....*....|....*....
gi 19923540 504 EVMEAQLpsHGGPKPSAESDMGTRRDYIMAKYVEHRFAR 542
Cdd:cd08834  81 EIMEANL--PPGYKPTPNSDMEERKDFIRAKYVEKKFVV 117

ArfGAP domain of ASAP2 (ArfGAP2 with SH3 domain, ANK repeat and PH domain-containing protein 2); The Arf GAPs are a family of multidomain proteins with a common catalytic domain that promotes the hydrolysis of GTP bound to Arf , thereby inactivating Arf signaling. ASAP-subfamily GAPs include three members: ASAP1, ASAP2, ASAP3. The ASAP subfamily comprises Arf GAP, SH3, ANK repeat and PH domains. From the N-terminus, each member has a BAR, PH, Arf GAP, ANK repeat, and proline rich domains. Unlike ASAP3, ASAP1 and ASAP2 also have an SH3 domain at the C-terminus. ASAP1 and ASAP2 show strong GTPase-activating protein (GAP) activity toward Arf1 and Arf5 and weak activity toward Arf6. ASAP1 is a target of Src and FAK signaling that regulates focal adhesions, circular dorsal ruffles (CDR), invadopodia, and podosomes. ASAP1 GAP activity is synergistically stimulated by phosphatidylinositol 4,5-bisphosphate (PIP2) and phosphatidic acid. ASAP2 is believed to function as an ArfGAP that controls ARF-mediated vesicle budding when recruited to Golgi membranes. It also functions as a substrate and downstream target for protein tyrosine kinases Pyk2 and Src, a pathway that may be involved in the regulation of vesicular transport.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 424 LTKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFN 503
Cdd:cd08849   1 LTKEIISEVQRMTGNDVCCDCGAPDPTWLSTNLGILTCIECSGIHRELGVHYSRMQSLTLDVLGTSELLLAKNIGNAGFN 80

                        90       100       110       120
                ....*....|....*....|....*....|....*....|
gi 19923540 504 EVMEAQLPSHGGPKPSAESDMGTRRDYIMAKYVEHRFARR 543
Cdd:cd08849  81 EIMEACLPAEDVVKPNPGSDMNARKDYITAKYIERRYARK 120

ArfGAP with SH3 domain, ankyrin repeat and PH domain Pleckstrin homology (PH) domain; ASAPs (ASAP1, ASAP2, and ASAP3) function as an Arf-specific GAPs, participates in rhodopsin trafficking, is associated with tumor cell metastasis, modulates phagocytosis, promotes cell proliferation, facilitates vesicle budding, Golgi exocytosis, and regulates vesicle coat assembly via a Bin/Amphiphysin/Rvs domain. ASAPs contain an NH2-terminal BAR domain, a tandem PH domain/GAP domain, three ankyrin repeats, two proline-rich regions, and a COOH-terminal Src homology 3 (SH3) 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.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 294 QHQGNKQFGTEKVGFLYKKSDG-IRRVWQKRKCGVKYGCLTISHSTINRPPVKLTLLTCQVRPNPEEKKCFDLVTHNRTY 372
Cdd:cd13251   1 QQQGNKSHGTEKSGYLLKKSEGkIRKVWQKRRCSIKDGFLTISHADENKPPAKLNLLTCQVKLVPEDKKCFDLISHNRTY 80

                        90       100
                ....*....|....*....|....*...
gi 19923540 373 HFQAEDEHECEAWVSVLQNSKDEALSSA 400
Cdd:cd13251  81 HFQAEDENDANAWMSVLKNSKEQALNKA 108

Putative GTPase activating protein for Arf; Putative zinc fingers with GTPase activating proteins (GAPs) towards the small GTPase, Arf. The GAP of ARD1 stimulates GTPase hydrolysis for ARD1 but not ARFs.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540   428 LIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNEVME 507
Cdd:pfam01412   3 VLRELLKLPGNKVCADCGAPNPTWASVNLGIFICIDCSGVHRSLGVHISKVRSLTLDTWTDEQLELMKAGGNDRANEFWE 82

                          90       100       110
                  ....*....|....*....|....*....|....*.
gi 19923540   508 AQLPShgGPKPSAESDMGTRRDYIMAKYVEHRFARR 543
Cdd:pfam01412  83 ANLPP--SYKPPPSSDREKRESFIRAKYVEKKFAKP 116

ArfGAP domain of ACAP3 (ArfGAP with Coiled-coil, ANK repeat and PH domains 3); ACAP3 belongs to the ACAP subfamily of GAPs (GTPase-activating proteins) for the small GTPase Arf (ADP-ribosylation factor). ACAP subfamily of ArfGAPs are composed of Coiled coli (BAR, Bin-Amphiphysin-Rvs), PH, ArfGAP and ANK repeats domains. It has been shown that ACAP3 positively regulates neurite outgrowth through its GAP activity specific to Arf6 in mouse hippocampal neurons. ACAP1 (centaurin beta1) and ACAP2 centaurin beta2) also have a GAP (GTPase-activating protein) activity preferentially toward Arf6, which regulates endocytic recycling. Both ACAP1/2 are activated by are activated by the phosphoinositides, PI(4,5)P2 and PI(3,5)P2. ACAP1 binds specifically with recycling cargo proteins such as transferrin receptor (TfR) and cellubrevin. Thus, ACAP1 promotes cargo sorting to enhance TfR recycling from the recycling endosome. In addition, phosphorylation of ACAP by Akt, a serine/threonine protein kinase, regulates the recycling of integrin beta1 to control cell migration. In contrast, ACAP2 does not exhibit a similar interaction with the recycling cargo proteins. It has been shown that ACAP2 functions both as an effector of Ras-related protein Rab35 and as an Arf6-GTPase-activating protein (GAP) during neurite outgrowth of PC12 cells. Moreover, ACAP2, together with Rab35, regulates phagocytosis in mammalian macrophages.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 428 LIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNEVME 507
Cdd:cd08850   3 ILQRVQSIAGNDQCCDCGQPDPRWASINLGILLCIECSGIHRSLGVHCSKVRSLTLDSWEPELLKLMCELGNSTVNQIYE 82

                        90       100       110
                ....*....|....*....|....*....|...
gi 19923540 508 AQLPSHGGPKPSAESDMGTRRDYIMAKYVEHRF 540
Cdd:cd08850  83 AQCEELGLKKPTASSSRQDKEAWIKAKYVEKKF 115

ArfGAP domain of ACAP2 (ArfGAP with Coiled-coil, ANK repeat and PH domains 2); ACAP2 belongs to the ACAP subfamily of GAPs (GTPase-activating proteins) for the small GTPase Arf (ADP-ribosylation factor). ACAP subfamily of ArfGAPs are composed of Coiled coli (BAR, Bin-Amphiphysin-Rvs), PH, ArfGAP and ANK repeats domains. ACAP1 (centaurin beta1) and ACAP2 centaurin beta2) have a GAP (GTPase-activating protein) activity preferentially toward Arf6, which regulates endocytic recycling. Both ACAP1/2 are activated by are activated by the phosphoinositides, PI(4,5)P2 and PI(3,5)P2. ACAP1 binds specifically with recycling cargo proteins such as transferrin receptor (TfR) and cellubrevin. Thus, ACAP1 promotes cargo sorting to enhance TfR recycling from the recycling endosome. In addition, phosphorylation of ACAP by Akt, a serine/threonine protein kinase, regulates the recycling of integrin beta1 to control cell migration. In contrast, ACAP2 does not exhibit a similar interaction with the recycling cargo proteins. It has been shown that ACAP2 functions both as an effector of Ras-related protein Rab35 and as an Arf6-GTPase-activating protein (GAP) during neurite outgrowth of PC12 cells. Moreover, ACAP2, together with Rab35, regulates phagocytosis in mammalian macrophages. ACAP3 also positively regulates neurite outgrowth through its GAP activity specific to Arf6 in mouse hippocampal neurons.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 432 VKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNEVMEAQLP 511
Cdd:cd08851   7 VQCIPGNASCCDCGLADPRWASINLGITLCIECSGIHRSLGVHFSKVRSLTLDTWEPELLKLMCELGNDVINRIYEARVE 86

                        90       100
                ....*....|....*....|....*....
gi 19923540 512 SHGGPKPSAESDMGTRRDYIMAKYVEHRF 540
Cdd:cd08851  87 KMGAKKPQPGGQRQEKEAYIRAKYVERKF 115

Putative GTP-ase activating proteins for the small GTPase, ARF; Putative zinc fingers with GTPase activating proteins (GAPs) towards the small GTPase, Arf. The GAP of ARD1 stimulates GTPase hydrolysis for ARD1 but not ARFs.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540    429 IAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNEVMEA 508
Cdd:smart00105   1 LKLLRSIPGNKKCFDCGAPNPTWASVNLGVFLCIECSGIHRSLGVHISKVRSLTLDTWTEEELRLLQKGGNENANSIWES 80

                           90       100       110
                   ....*....|....*....|....*....|...
gi 19923540    509 QLpsHGGPKPSAESDMGTRRD-YIMAKYVEHRF 540
Cdd:smart00105  81 NL--DDFSLKPPDDDDQQKYEsFIAAKYEEKLF 111

Stromal membrane-associated proteins; a subfamily of the ArfGAP family; The SMAP subfamily of Arf GTPase-activating proteins consists of the two structurally-related members, SMAP1 and SMAP2. Each SMAP member exhibits common and distinct functions in vesicle trafficking. They both bind to clathrin heavy chain molecules and are involved in the trafficking of clathrin-coated vesicles. SMAP1 preferentially exhibits GAP toward Arf6, while SMAP2 prefers Arf1 as a substrate. SMAP1 is involved in Arf6-dependent vesicle trafficking, but not Arf6-mediated actin cytoskeleton reorganization, and regulates clathrin-dependent endocytosis of the transferrin receptors and E-cadherin. SMAP2 regulates Arf1-dependent retrograde transport of TGN38/46 from the early endosome to the trans-Golgi network (TGN). SMAP2 has the Clathrin Assembly Lymphoid Myeloid (CALM)-binding domain, but SMAP1 does not.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 424 LTKLLiaevkSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFN 503
Cdd:cd08839   1 LAKLL-----REEDNKYCADCGAKGPRWASWNLGVFICIRCAGIHRNLGVHISKVKSVNLDSWTPEQVQSMQEMGNARAN 75

                        90       100       110
                ....*....|....*....|....*....|..
gi 19923540 504 EVMEAQLPShGGPKPSAESDMGTrrdYIMAKY 535
Cdd:cd08839  76 AYYEANLPD-GFRRPQTDSALEN---FIRDKY 103

ArfGap with dual PH domains; The ADAP subfamily, ArfGAPs with dual pleckstrin homology (PH) domains, includes two members: ADAP1 and ADAP2. Both ADAP1 (also known as centaurin-alpha1, p42(IP4), or PIP3BP) and ADAP2 (centaurin-alpha2) display a GTPase-activating protein (GAP) activity toward Arf6 (ADP-ribosylation factor 6), which is involved in protein trafficking that regulates endocytic recycling, cytoskeleton remodeling, and neuronal differentiation. ADAP2 has high sequence similarity to the ADAP1 and they both contain a ArfGAP domain at the N-terminus, followed by two PH domains. However, ADAP1, unlike ADAP2, contains a putative N-terminal nuclear localization signal. The PH domains of ADAP1bind to the two second messenger molecules phosphatidylinositol 3,4,5-trisphosphate (PI(3,4,5)P3) and inositol 1,3,4,5-tetrakisphosphate (I(1,3,4,5)P4) with identical high affinity, whereas those of ADAP2 specifically binds phosphatidylinositol 3,4-bisphosphate (PI(3,4)P2) and PI(3,4,5)P3, which are produced by activated phosphatidylinositol 3-kinase. ADAP1 is predominantly expressed in the brain neurons, while ADAP2 is broadly expressed, including the adipocytes, heart, and skeletal muscle but not in the brain. The limited distribution and high expression of ADAP1 in the brain indicates that ADAP1 is important for neuronal functions. ADAP1 has been shown to highly expressed in the neurons and plagues of Alzheimer's disease patients. In other hand, ADAP2 gene deletion has been shown to cause circulatory deficiencies and heart shape defects in zebrafish, indicating that ADAP2 has a vital role in heart development. Taken together, the hemizygous deletion of ADAP2 gene may be contributing to the cardiovascular malformation in patients with neurofibromatosis type 1 (NF1) microdeletions.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 422 HDLTKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTS 501
Cdd:cd08832   1 AERNKKRLLELLKLPGNNTCADCGAPDPEWASYNLGVFICLDCSGIHRSLGTHISKVKSLRLDNWDDSQVEFMEENGNEK 80

                        90       100       110
                ....*....|....*....|....*....|....
gi 19923540 502 FNEVMEAQLPShGGPKPSAESDMGTRRDYIMAKY 535
Cdd:cd08832  81 AKAKYEAHVPA-FYRRPTPTDPQVLREQWIRAKY 113

ArfGAP with GTPase domain, ANK repeat and PH domain 3; The AGAP subfamily of ADP-ribosylation factor GTPase-activating proteins (Arf GAPs) includes three members: AGAP1-3. In addition to the Arf GAP domain, AGAP proteins contain GTP-binding protein-like, ANK repeat and pleckstrin homology (PH) domains. AGAP3 exists as a component of the NMDA receptor complex that regulates Arf6 and Ras/ERK signaling pathways. Moreover, AGAP3 regulates AMPA receptor trafficking through the ArfGAP domain. Together, AGAP3 is believed to involve in linking NMDA receptor activation to AMPA receptor trafficking. AGAP1 and AGAP2 have phosphatidylinositol 4,5-bisphosphate (PI(4,5)P2)-mediated GTPase-activating protein (GAP) activity preferentially toward Arf1, and function in the endocytic system. AGAP1 and AGAP2 independently regulate AP-3 endosomes and AP-1/Rab4 fast recycling endosomes, respectively. AGAP1, via its PH domain, directly interacts with the adapter protein 3 (AP-3), which is a coat protein involved in trafficking in the endosomal-lysosomal system, and regulates AP-3-dependent trafficking. In other hand, AGAP2 specifically binds the clathrin adaptor protein AP-1 and regulates the AP-1/Rab-4 dependent endosomal trafficking. AGAP2 is overexpressed in different human cancers including prostate carcinoma and glioblastoma, and promotes cancer cell invasion.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 425 TKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLgPSELLLALN-MGNTSFN 503
Cdd:cd08855   1 DALAIQSIRNVRGNSFCIDCDAPNPDWASLNLGALMCIECSGIHRNLGTHLSRVRSLDLDDW-PVELSMVMTaIGNAMAN 79

                        90       100       110
                ....*....|....*....|....*....|..
gi 19923540 504 EVMEAQLpsHGGPKPSAESDMGTRRDYIMAKY 535
Cdd:cd08855  80 SVWEGAL--DGYSKPGPDSTREEKERWIRAKY 109

Arf1 GTPase-activating protein 1; ArfGAP (ADP Ribosylation Factor GTPase Activating Protein) domain is a part of ArfGap1-like proteins that play a crucial role in controlling of membrane trafficking, particularly in the formation of COPI (coat protein complex I)-coated vesicles on Golgi membranes. The ArfGAP1 protein subfamily consists of three members: ArfGAP1 (Gcs1p in yeast), ArfGAP2 and ArfGAP3 (both are homologs of yeast Glo3p). ArfGAP2/3 are closely related, but with little similarity to ArfGAP1, except the catalytic ArfGAP domain. They promote hydrolysis of GTP bound to the small G protein ADP-ribosylation factor 1 (Arf1), which leads to the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. Thus, the GAP catalytic activity plays a key role in the formation of COPI vesicles from Golgi membrane. In contrast to ArfGAP1, which displays membrane curvature-dependent ArfGAP activity, ArfGAP2 and ArfGAP3 activities are dependent on coatomer (the core COPI complex) which required for efficient recruitment of ArfGAP2 and ArfGAP3 to the Golgi membrane. Accordingly, ArfGAP2/3 has been implicated in coatomer-mediated protein transport between the Golgi complex and the endoplasmic reticulum. Unlike ArfGAP1, which is controlled by membrane curvature through its amphipathic lipid packing sensor (ALPS) motifs, ArfGAP2/3 do not possess ALPS motif.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 425 TKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNE 504
Cdd:cd08830   1 ARAVLRELQKLPGNNRCFDCGAPNPQWASVSYGIFICLECSGVHRGLGVHISFVRSITMDSWSEKQLKKMELGGNAKLRE 80

                ....*
gi 19923540 505 VMEAQ 509
Cdd:cd08830  81 FFESY 85

ARF1 GTPase-activating protein 1-like; ArfGAP (ADP Ribosylation Factor GTPase Activating Protein) domain is a part of ArfGap1-like proteins that play a crucial role in controlling of membrane trafficking, particularly in the formation of COPI (coat protein complex I)-coated vesicles on Golgi membranes. The ArfGAP1 protein subfamily consists of three members: ArfGAP1 (Gcs1p in yeast), ArfGAP2 and ArfGAP3 (both are homologs of yeast Glo3p). ArfGAP2/3 are closely related, but with little similarity to ArfGAP1, except the catalytic ArfGAP domain. They promote hydrolysis of GTP bound to the small G protein ADP-ribosylation factor 1 (Arf1), which leads to the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. Thus, the GAP catalytic activity plays a key role in the formation of COPI vesicles from Golgi membrane. In contrast to ArfGAP1, which displays membrane curvature-dependent ArfGAP activity, ArfGAP2 and ArfGAP3 activities are dependent on coatomer (the core COPI complex) which required for efficient recruitment of ArfGAP2 and ArfGAP3 to the Golgi membrane. Accordingly, ArfGAP2/3 has been implicated in coatomer-mediated protein transport between the Golgi complex and the endoplasmic reticulum. Unlike ArfGAP1, which is controlled by membrane curvature through its amphipathic lipid packing sensor (ALPS) motifs, ArfGAP2/3 do not possess ALPS motif.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 425 TKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLalnM---GNTS 501
Cdd:cd08959   1 TRAVFKKLRSKPENKVCFDCGAKNPQWASVTYGIFICLDCSGVHRGLGVHISFVRSTTMDKWTEEQLRK---MkvgGNAN 77

                        90
                ....*....|....*.
gi 19923540 502 FNEVMEaqlpSHGGPK 517
Cdd:cd08959  78 AREFFK----QHGIYD 89

Arf1 GTPase-activating protein 2/3-like; ArfGAP (ADP Ribosylation Factor GTPase Activating Protein) domain is a part of ArfGap1-like proteins that play a crucial role in controlling of membrane trafficking, particularly in the formation of COPI (coat protein complex I)-coated vesicles on Golgi membranes. The ArfGAP1 protein subfamily consists of three members: ArfGAP1 (Gcs1p in yeast), ArfGAP2 and ArfGAP3 (both are homologs of yeast Glo3p). ArfGAP2/3 are closely related, but with little similarity to ArfGAP1, except the catalytic ArfGAP domain. They promote hydrolysis of GTP bound to the small G protein ADP-ribosylation factor 1 (Arf1), which leads to the dissociation of coat proteins from Golgi-derived membranes and vesicles. Dissociation of the coat proteins is required for the fusion of these vesicles with target compartments. Thus, the GAP catalytic activity plays a key role in the formation of COPI vesicles from Golgi membrane. In contrast to ArfGAP1, which displays membrane curvature-dependent ArfGAP activity, ArfGAP2 and ArfGAP3 activities are dependent on coatomer (the core COPI complex) which required for efficient recruitment of ArfGAP2 and ArfGAP3 to the Golgi membrane. Accordingly, ArfGAP2/3 has been implicated in coatomer-mediated protein transport between the Golgi complex and the endoplasmic reticulum. Unlike ArfGAP1, which is controlled by membrane curvature through its amphipathic lipid packing sensor (ALPS) motifs, ArfGAP2/3 do not possess ALPS motif.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 425 TKLLIAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNE 504
Cdd:cd08831   2 RDAIFKKLRSKPENKVCFDCGAKNPTWASVTFGVFLCLDCSGVHRSLGVHISFVRSTNLDSWTPEQLRRMKVGGNAKARE 81

                        90
                ....*....|..
gi 19923540 505 VMEaqlpSHGGP 516
Cdd:cd08831  82 FFK----QHGGL 89

Stromal membrane-associated protein 2; a subfamily of the ArfGAP family; The SMAP subfamily of Arf GTPase-activating proteins consists of the two structurally-related members, SMAP1 and SMAP2. Each SMAP member exhibits common and distinct functions in vesicle trafficking. They both bind to clathrin heavy chain molecules and are involved in the trafficking of clathrin-coated vesicles. SMAP1 preferentially exhibits GAP toward Arf6, while SMAP2 prefers Arf1 as a substrate. SMAP1 is involved in Arf6-dependent vesicle trafficking, but not Arf6-mediated actin cytoskeleton reorganization, and regulates clathrin-dependent endocytosis of the transferrin receptors and E-cadherin. SMAP2 regulates Arf1-dependent retrograde transport of TGN38/46 from the early endosome to the trans-Golgi network (TGN). SMAP2 has the Clathrin Assembly Lymphoid Myeloid (CALM)-binding domain, but SMAP1 does not.

                        10        20        30        40        50        60        70        80
                ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 19923540 429 IAEVKSRPGNSQCCDCGAADPTWLSTNLGVLTCIQCSGVHRELGVRFSRMQSLTLDLLGPSELLLALNMGNTSFNEVMEA 508
Cdd:cd08859   1 LASLLLEEENKFCADCQSKGPRWASWNIGVFICIRCAGIHRNLGVHISRVKSVNLDQWTQEQIQCMQEMGNGKANRLYEA 80