The PB1 domain is an essential part of p62 scaffold protein (alias sequestosome 1,SQSTM) involved in cell signaling, receptor internalization, and protein turnover. The PB1 domain is a modular domain mediating specific protein-protein interaction which play roles in many critical cell processes. A canonical PB1-PB1 interaction, which involves heterodimerization of two PB1 domains, is required for the formation of macromolecular signaling complexes ensuring specificity and fidelity during cellular signaling. The interaction between two PB1 domain depends on the type of PB1. There are three types of PB1 domains: type I which contains an OPCA motif, acidic aminoacid cluster, type II which contains a basic cluster, and type I/II which contains both an OPCA motif and a basic cluster. Interactions of PB1 domains with other protein domains have been described as noncanonical PB1-interactions. The PB1 domain module is conserved in amoebas, fungi, animals, and plants.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 741931014   4 LTVKAYLLGKeDAAREIRRFSFCfspepeaeaeaAPGPRPCERLLNRVAALFPVLRPGGFQAHYRDEDGDLVAFSSDEEL 83
Cdd:cd06402    1 LTVKAYLLGK-DANAEIRRFAID-----------EDVSTSYEYLVEKVAAVFPSLRGKNFQLFWKDEEGDLVAFSSDEEL 68

                         90
                 ....*....|....*....
gi 741931014  84 TMAMSYVKDDIFRIYIKEK 102
Cdd:cd06402   69 VMALGSLNDDTFRIYIKEK 87

The PB1 domain is an essential part of p62 scaffold protein (alias sequestosome 1,SQSTM) involved in cell signaling, receptor internalization, and protein turnover. The PB1 domain is a modular domain mediating specific protein-protein interaction which play roles in many critical cell processes. A canonical PB1-PB1 interaction, which involves heterodimerization of two PB1 domains, is required for the formation of macromolecular signaling complexes ensuring specificity and fidelity during cellular signaling. The interaction between two PB1 domain depends on the type of PB1. There are three types of PB1 domains: type I which contains an OPCA motif, acidic aminoacid cluster, type II which contains a basic cluster, and type I/II which contains both an OPCA motif and a basic cluster. Interactions of PB1 domains with other protein domains have been described as noncanonical PB1-interactions. The PB1 domain module is conserved in amoebas, fungi, animals, and plants.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 741931014   4 LTVKAYLLGKeDAAREIRRFSFCfspepeaeaeaAPGPRPCERLLNRVAALFPVLRPGGFQAHYRDEDGDLVAFSSDEEL 83
Cdd:cd06402    1 LTVKAYLLGK-DANAEIRRFAID-----------EDVSTSYEYLVEKVAAVFPSLRGKNFQLFWKDEEGDLVAFSSDEEL 68

                         90
                 ....*....|....*....
gi 741931014  84 TMAMSYVKDDIFRIYIKEK 102
Cdd:cd06402   69 VMALGSLNDDTFRIYIKEK 87

UBA domain of sequestosome-1 (SQSTM) and similar proteins; SQSTM, also called EBI3-associated protein of 60 kDa (EBIAP /p60), phosphotyrosine-independent ligand for the Lck SH2 domain of 62 kDa, or ubiquitin-binding protein p62, is a widely expressed multifunctional cytoplasmic protein that is able to noncovalently bind ubiquitin and several signaling proteins, suggesting a regulatory role connected to the ubiquitin-proteasome pathway. It functions as a scaffolding protein that regulates a diverse range of signaling pathways leading to activation of the nuclear factor kappa B (NF-kappaB) family of transcription factors. It also plays a novel role in connecting receptor signals with the endosomal signaling network required for mediating TrkA-induced differentiation. SQSTM contains a PB1 dimerization domain, a tumor necrosis factor receptor-associated factor 6 (TRAF6) binding site, and a C-terminal ubiquitin-associated (UBA) domain that mediates the recognition of polyubiquitin chains and ubiquitylated substrates.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|
gi 741931014 366 RLIESLSQMLSMGFSDEGGWLTRLLQTKNYDIGAALDTIQ 405
Cdd:cd14320    1 KIEEALSQMLAMGFSNEGGWLTRLLEAKNGDIGKVLDVIQ 40

PB1 domain; Phox and Bem1p domain, present in many eukaryotic cytoplasmic signalling proteins. The domain adopts a beta-grasp fold, similar to that found in ubiquitin and Ras-binding domains. A motif, variously termed OPR, PC and AID, represents the most conserved region of the majority of PB1 domains, and is necessary for PB1 domain function. This function is the formation of PB1 domain heterodimers, although not all PB1 domain pairs associate.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 741931014     3 SLTVKAYLLGkedaarEIRRFSFCFSPepeaeaeaapgprPCERLLNRVAALFPvLRPGGFQAHYRDEDGDLVAFSSDEE 82
Cdd:smart00666   1 TVDVKLRYGG------ETRRLSVPRDI-------------SFEDLRSKVAKRFG-LDNQSFTLKYQDEDGDLVSLTSDED 60

                           90       100
                   ....*....|....*....|
gi 741931014    83 LTMAMSYVK---DDIFRIYI 99
Cdd:smart00666  61 LEEAIEEYDslgSKKLRLHV 80

Zinc finger, ZZ type; Zinc finger present in dystrophin, CBP/p300. ZZ in dystrophin binds calmodulin. Putative zinc finger; binding not yet shown. Four to six cysteine residues in its sequence are responsible for coordinating zinc ions, to reinforce the structure.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|..
gi 741931014  123 HPNVICDGC-NGPVVGTRYKCSVCPDYDLCSACEGKGLHREH 163
Cdd:pfam00569   2 HKVYTCNGCsNDPSIGVRYHCLRCSDYDLCQSCFQTHKGGNH 43

The PB1 domain is an essential part of p62 scaffold protein (alias sequestosome 1,SQSTM) involved in cell signaling, receptor internalization, and protein turnover. The PB1 domain is a modular domain mediating specific protein-protein interaction which play roles in many critical cell processes. A canonical PB1-PB1 interaction, which involves heterodimerization of two PB1 domains, is required for the formation of macromolecular signaling complexes ensuring specificity and fidelity during cellular signaling. The interaction between two PB1 domain depends on the type of PB1. There are three types of PB1 domains: type I which contains an OPCA motif, acidic aminoacid cluster, type II which contains a basic cluster, and type I/II which contains both an OPCA motif and a basic cluster. Interactions of PB1 domains with other protein domains have been described as noncanonical PB1-interactions. The PB1 domain module is conserved in amoebas, fungi, animals, and plants.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 741931014   4 LTVKAYLLGKeDAAREIRRFSFCfspepeaeaeaAPGPRPCERLLNRVAALFPVLRPGGFQAHYRDEDGDLVAFSSDEEL 83
Cdd:cd06402    1 LTVKAYLLGK-DANAEIRRFAID-----------EDVSTSYEYLVEKVAAVFPSLRGKNFQLFWKDEEGDLVAFSSDEEL 68

                         90
                 ....*....|....*....
gi 741931014  84 TMAMSYVKDDIFRIYIKEK 102
Cdd:cd06402   69 VMALGSLNDDTFRIYIKEK 87

UBA domain of sequestosome-1 (SQSTM) and similar proteins; SQSTM, also called EBI3-associated protein of 60 kDa (EBIAP /p60), phosphotyrosine-independent ligand for the Lck SH2 domain of 62 kDa, or ubiquitin-binding protein p62, is a widely expressed multifunctional cytoplasmic protein that is able to noncovalently bind ubiquitin and several signaling proteins, suggesting a regulatory role connected to the ubiquitin-proteasome pathway. It functions as a scaffolding protein that regulates a diverse range of signaling pathways leading to activation of the nuclear factor kappa B (NF-kappaB) family of transcription factors. It also plays a novel role in connecting receptor signals with the endosomal signaling network required for mediating TrkA-induced differentiation. SQSTM contains a PB1 dimerization domain, a tumor necrosis factor receptor-associated factor 6 (TRAF6) binding site, and a C-terminal ubiquitin-associated (UBA) domain that mediates the recognition of polyubiquitin chains and ubiquitylated substrates.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|
gi 741931014 366 RLIESLSQMLSMGFSDEGGWLTRLLQTKNYDIGAALDTIQ 405
Cdd:cd14320    1 KIEEALSQMLAMGFSNEGGWLTRLLEAKNGDIGKVLDVIQ 40

Zinc finger, ZZ type. Zinc finger present in dystrophin, CBP/p300 and many other proteins. The ZZ motif coordinates one or two zinc ions and most likely participates in ligand binding or molecular scaffolding. Many proteins containing ZZ motifs have other zinc-binding motifs as well, and the majority serve as scaffolds in pathways involving acetyltransferase, protein kinase, or ubiqitin-related activity. ZZ proteins can be grouped into the following functional classes: chromatin modifying, cytoskeletal scaffolding, ubiquitin binding or conjugating, and membrane receptor or ion-channel modifying proteins.

                         10        20        30
                 ....*....|....*....|....*....|....*..
gi 741931014 126 VICDGCNGPVVGTRYKCSVCPDYDLCSAC--EGKGLH 160
Cdd:cd02249    1 YSCDGCLKPIVGVRYHCLVCEDFDLCSSCyaKGKKGH 37

The PB1 domain is a modular domain mediating specific protein-protein interactions which play a role in many critical cell processes, such as osteoclastogenesis, angiogenesis, early cardiovascular development, and cell polarity. A canonical PB1-PB1 interaction, which involves heterodimerization of two PB1 domain, is required for the formation of macromolecular signaling complexes ensuring specificity and fidelity during cellular signaling. The interaction between two PB1 domain depends on the type of PB1. There are three types of PB1 domains: type I which contains an OPCA motif, acidic aminoacid cluster, type II which contains a basic cluster, and type I/II which contains both an OPCA motif and a basic cluster. Interactions of PB1 domains with other protein domains have been described as a noncanonical PB1-interactions. The PB1 domain module is conserved in amoebas, fungi, animals, and plants.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 741931014   4 LTVKAYLLGkedaarEIRRFSFCFSPEpeaeaeaapgprPCERLLNRVAALFPvLRPGGFQAHYRDEDGDLVAFSSDEEL 83
Cdd:cd05992    1 VRVKVKYGG------EIRRFVVVSRSI------------SFEDLRSKIAEKFG-LDAVSFKLKYPDEDGDLVTISSDEDL 61

                         90       100
                 ....*....|....*....|
gi 741931014  84 TMAMSYVK---DDIFRIYIK 100
Cdd:cd05992   62 EEAIEEARrsgSKKLRLFVF 81

PB1 domain;

                          10        20        30        40        50        60
                  ....*....|....*....|....*....|....*....|....*....|....*....|...
gi 741931014   43 PCERLLNRVAALFPvLRPGGFQAHYRDEDGDLVAFSSDEELTMAMSYVK---DDIFRIYIKEK 102
Cdd:pfam00564  23 SFEELRALVEQRFG-LDDVDFKLKYPDEDGDLVSLTSDEDLEEALEEARslgSKSLRLHVFPT 84

Zinc finger, ZZ type. Zinc finger present in CBP/p300 and related proteins. The ZZ motif coordinates two zinc ions and most likely participates in ligand binding or molecular scaffolding. CREB-binding protein (CBP) is a large multidomain protein that provides binding sites for transcriptional coactivators, the role of the ZZ domain in CBP/p300 is unclear.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|
gi 741931014 128 CDGCNGpVVGTRYKCSVCPDYDLCSAC-EGKGLHREHGKL 166
Cdd:cd02337    3 CNECKH-HVETRWHCTVCEDYDLCITCyNTKNHPHKMEKL 41

Zinc finger, ZZ type. Zinc finger present in ZZZ3 (ZZ finger containing 3) and related proteins. The ZZ motif coordinates two zinc ions and most likely participates in ligand binding or molecular scaffolding.

                         10        20        30
                 ....*....|....*....|....*....|....*
gi 741931014 128 CDGCN-GPVVGTRYKCSVCP--DYDLCSACEGKGL 159
Cdd:cd02341    3 CDSCGiEPIPGTRYHCSECDdgDFDLCQDCVVKGE 37

Zinc finger, ZZ type. Zinc finger present in HERC2 and related proteins. HERC2 is a potential E3 ubiquitin protein ligase and/or guanine nucleotide exchange factor. The ZZ motif coordinates two zinc ions and most likely participates in ligand binding or molecular scaffolding.

                         10        20        30
                 ....*....|....*....|....*....|
gi 741931014 126 VICDGCNG-PVVGTRYKCSVCPDYDLCSAC 154
Cdd:cd02344    1 VTCDGCQMfPINGPRFKCRNCDDFDFCENC 30

Zinc finger, ZZ type. Zinc finger present in ADA2, a putative transcriptional adaptor, and related proteins. The ZZ motif coordinates two zinc ions and most likely participates in ligand binding or molecular scaffolding.

                         10        20
                 ....*....|....*....|....*...
gi 741931014 128 CDGCNGPVVGT-RYKCSVCPDYDLCSAC 154
Cdd:cd02335    3 CDYCSKDITGTiRIKCAECPDFDLCLEC 30

Zinc finger, ZZ type. Zinc finger present in dystrophin and dystrobrevin. The ZZ motif coordinates two zinc ions and most likely participates in ligand binding or molecular scaffolding. Dystrophin attaches actin filaments to an integral membrane glycoprotein complex in muscle cells. The ZZ domain in dystrophin has been shown to be essential for binding to the membrane protein beta-dystroglycan.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*
gi 741931014 126 VICDGCNG-PVVGTRYKCSVCPDYDLCSACEGKGLHREHGKLAFP 169
Cdd:cd02334    1 AKCNICKEfPITGFRYRCLKCFNYDLCQSCFFSGRTSKSHKNSHP 45