PDZ domain of membrane palmitoylated protein1 (MPP1), and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain of MPP1, and related domains. MPP1 (also known as MAGUK p55 subfamily member 1, erythrocyte membrane protein p55, EMP55) is a membrane-associated guanylate kinase (MAGUK)-like protein which forms a complex with protein 4.1 and glycophorin C (GPC) at the cytoplasmic face of the plasma membrane; this complex is essential for cytoskeleton-membrane linkage in erythrocytes and many non-erythroid cells, and participates in the determination of membrane stability and cell shape. MPP1, by interacting with various scaffold proteins and cytoskeletal proteins in the postsynaptic density, also plays an important role in organizing synaptic and non-synaptic structures. MPP1 is also a component of the Crumbs protein complex in the mammalian retina and may link the Usher protein network and the Crumbs protein complex. The MPP1 PDZ domain binding partners include GPC, ABCC4, and CADM1/Necl-2/SynCAM1. PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This MPP1-like family domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged in the order: beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259  70 RLIQFEKVTEEPMGITLKLNEKQSCTVARILHGGMIHRQGSLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMISLKVI 149
Cdd:cd10830    1 RLVQFEKNTEEPMGITLKLNEKQSCIVARILHGGMIHRQGSLHVGDEILEINGKSVTNHSVDQLQKMLKETKGMVSLKVI 80

                 .
gi 262118259 150 P 150
Cdd:cd10830   81 P 81

Guanylate kinase homologues; Active enzymes catalyze ATP-dependent phosphorylation of GMP to GDP. Structure resembles that of adenylate kinase. So-called membrane-associated guanylate kinase homologues (MAGUKs) do not possess guanylate kinase activities; instead at least some possess protein-binding functions.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259   271 SGVGRSHIKNALLSQNPEKFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFETVHQIH 350
Cdd:smart00072   1 SGVGKGTLLAELIQEIPDAFERVVSHTTRPPRPGEVNGVDYHFVSKEEFEDDIKSGLFLEWGEYEGNYYGTSKETIRQVA 80

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259   351 KQNKIAILDIEPQTLKIVRTAELSPFIVFIAPTDQ--------GTQTEALQQLQKDSEAIRSQYAHY--FDLSLVNNGVD 420
Cdd:smart00072  81 EKGKHCLLDIDPQGVKQLRKAQLYPIVIFIAPPSSeelerrlrQRGTETSERIQKRLAAAQKEAQEYhlFDYVIVNDDLE 160

                          170
                   ....*....|....
gi 262118259   421 ETLKKLQEAFDQAC 434
Cdd:smart00072 161 DAYEELKEILEAEQ 174

Guanosine monophosphate kinase (GMPK, EC 2.7.4.8), also known as guanylate kinase (GKase), catalyzes the reversible phosphoryl transfer from adenosine triphosphate (ATP) to guanosine monophosphate (GMP) to yield adenosine diphosphate (ADP) and guanosine diphosphate (GDP). It plays an essential role in the biosynthesis of guanosine triphosphate (GTP). This enzyme is also important for the activation of some antiviral and anticancer agents, such as acyclovir, ganciclovir, carbovir, and thiopurines.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 265 LVLIGASGVGRSHIKNALLSQNPEKFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFE 344
Cdd:cd00071    2 IVLSGPSGVGKSTLLKRLLEEFDPNFGFSVSHTTRKPRPGEVDGVDYHFVSKEEFERLIENGEFLEWAEFHGNYYGTSKA 81

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 262118259 345 TVHQIHKQNKIAILDIEPQTLKIVRTAELSPFIVFIAPTD 384
Cdd:cd00071   82 AVEEALAEGKIVILEIDVQGARQVKKSYPDAVSIFILPPD 121

Guanylate kinase [Nucleotide transport and metabolism];

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 265 LVLIGASGVGRSHIKNALLSQNPEkFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFE 344
Cdd:COG0194    5 IVLSGPSGAGKTTLVKALLERDPD-LRFSVSATTRPPRPGEVDGVDYHFVSREEFERMIENGEFLEWAEVHGNYYGTPKA 83

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 345 TVHQIHKQNKIAILDIEPQTLKIVRtaELSP--FIVFIAPTDQ----------GTQTEALQQ--LQKDSEAIrsQYAHYF 410
Cdd:COG0194   84 EVEEALAAGKDVLLEIDVQGARQVK--KKFPdaVSIFILPPSLeelerrlrgrGTDSEEVIErrLAKAREEL--AHADEF 159

                        170
                 ....*....|....*...
gi 262118259 411 DLSLVNNGVDETLKKLQE 428
Cdd:COG0194  160 DYVVVNDDLDRAVEELKA 177

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.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....
gi 262118259 150 PNQQSRLPAlQEAGLKFATGDIIQIINKDDSNWWQGRVEGSSKESAGLIPSPEL 203
Cdd:cd12080   10 PKKDNLIPC-KEAGLKFQTGDIIQIINKDDSNWWQGRVEGSGEESAGLIPSPEL 62

Domain present in PSD-95, Dlg, and ZO-1/2; Also called DHR (Dlg homologous region) or GLGF (relatively well conserved tetrapeptide in these domains). Some PDZs have been shown to bind C-terminal polypeptides; others appear to bind internal (non-C-terminal) polypeptides. Different PDZs possess different binding specificities.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259    68 KVRLIQFEKvTEEPMGITLK--LNEKQSCTVARILHGGMIHRQGsLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMIS 145
Cdd:smart00228   1 EPRLVELEK-GGGGLGFSLVggKDEGGGVVVSSVVPGSPAAKAG-LRVGDVILEVNGTSVEGLTHLEAVDLLKKAGGKVT 78

                   ....*.
gi 262118259   146 LKVIPN 151
Cdd:smart00228  79 LTVLRG 84

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.

                          10        20        30
                  ....*....|....*....|....*....|....*..
gi 262118259  164 LKFATGDIIQIINKDDSNWWQGRVeGSSKEsaGLIPS 200
Cdd:pfam00018  14 LSFKKGDIIIVLEKSEDGWWKGRN-KGGKE--GLIPS 47

Guanylate kinase homologues; Active enzymes catalyze ATP-dependent phosphorylation of GMP to GDP. Structure resembles that of adenylate kinase. So-called membrane-associated guanylate kinase homologues (MAGUKs) do not possess guanylate kinase activities; instead at least some possess protein-binding functions.

                           10        20        30        40        50        60        70        80
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259   271 SGVGRSHIKNALLSQNPEKFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFETVHQIH 350
Cdd:smart00072   1 SGVGKGTLLAELIQEIPDAFERVVSHTTRPPRPGEVNGVDYHFVSKEEFEDDIKSGLFLEWGEYEGNYYGTSKETIRQVA 80

                           90       100       110       120       130       140       150       160
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259   351 KQNKIAILDIEPQTLKIVRTAELSPFIVFIAPTDQ--------GTQTEALQQLQKDSEAIRSQYAHY--FDLSLVNNGVD 420
Cdd:smart00072  81 EKGKHCLLDIDPQGVKQLRKAQLYPIVIFIAPPSSeelerrlrQRGTETSERIQKRLAAAQKEAQEYhlFDYVIVNDDLE 160

                          170
                   ....*....|....
gi 262118259   421 ETLKKLQEAFDQAC 434
Cdd:smart00072 161 DAYEELKEILEAEQ 174

PDZ domain of peripheral plasma membrane protein CASK, Caenorhabditis Lin-2, and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain of CASK, Caenorhabditis elegans Lin-2, and related domains. CASK and Lin-2 are membrane-associated guanylate kinase (MAGUK)-like proteins. CASK (also known as Calcium/calmodulin-dependent protein kinase, CAKI, and Camguk) has a role in synaptic transmembrane protein anchoring and ion channel trafficking. CASK may regulate transmembrane proteins that bind calcium, calmodulin, or nucleotides; it regulates the Drosophila ether a go-go (eag) potassium channel, and also regulates autophosphorylation of CaMKII. CASK binding partners include the transcription factor TBR1, and cell-surface proteins, including amyloid precursor protein, neurexins, and syndecans. Lin-2, as a component of the CLin-10-Lin-2-Lin-7 complex, plays a role in controlling the basolateral localization of the EGF receptor Let-23; this complex also associates with the neuron-specific motor protein KIF17 to transport vesicles containing N-methyl-D-aspartate (NMDA) receptor 2B along microtubules. CASK may also function in targeting or scaffolding of the protein parkin which is selectively truncated by a Parkinson's disease-causing mutation; the C-terminus of parkin functions as a class II PDZ-binding motif that binds CASK. PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This MPP6-MPP2-like family domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged in the order: beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259  70 RLIQFEKVTEEPMGITLKLNEKQSCTVARILHGGMIHRQGSLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMISLKVI 149
Cdd:cd10831    1 RLVQFQKNTDEPMGITLKMNEDGRCIVARIMHGGMIHRQGTLHVGDEIREINGISVANQTVEQLQKMLREARGSITFKIV 80

                 .
gi 262118259 150 P 150
Cdd:cd10831   81 P 81

Guanosine monophosphate kinase (GMPK, EC 2.7.4.8), also known as guanylate kinase (GKase), catalyzes the reversible phosphoryl transfer from adenosine triphosphate (ATP) to guanosine monophosphate (GMP) to yield adenosine diphosphate (ADP) and guanosine diphosphate (GDP). It plays an essential role in the biosynthesis of guanosine triphosphate (GTP). This enzyme is also important for the activation of some antiviral and anticancer agents, such as acyclovir, ganciclovir, carbovir, and thiopurines.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 265 LVLIGASGVGRSHIKNALLSQNPEKFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFE 344
Cdd:cd00071    2 IVLSGPSGVGKSTLLKRLLEEFDPNFGFSVSHTTRKPRPGEVDGVDYHFVSKEEFERLIENGEFLEWAEFHGNYYGTSKA 81

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|
gi 262118259 345 TVHQIHKQNKIAILDIEPQTLKIVRTAELSPFIVFIAPTD 384
Cdd:cd00071   82 AVEEALAEGKIVILEIDVQGARQVKKSYPDAVSIFILPPD 121

Guanylate kinase [Nucleotide transport and metabolism];

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 265 LVLIGASGVGRSHIKNALLSQNPEkFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFE 344
Cdd:COG0194    5 IVLSGPSGAGKTTLVKALLERDPD-LRFSVSATTRPPRPGEVDGVDYHFVSREEFERMIENGEFLEWAEVHGNYYGTPKA 83

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 345 TVHQIHKQNKIAILDIEPQTLKIVRtaELSP--FIVFIAPTDQ----------GTQTEALQQ--LQKDSEAIrsQYAHYF 410
Cdd:COG0194   84 EVEEALAAGKDVLLEIDVQGARQVK--KKFPdaVSIFILPPSLeelerrlrgrGTDSEEVIErrLAKAREEL--AHADEF 159

                        170
                 ....*....|....*...
gi 262118259 411 DLSLVNNGVDETLKKLQE 428
Cdd:COG0194  160 DYVVVNDDLDRAVEELKA 177

guanylate kinase; Provisional

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 265 LVLIGASGVGRSHIKNALLSQNPEkFVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGTKFE 344
Cdd:PRK00300   8 IVLSGPSGAGKSTLVKALLERDPN-LQLSVSATTRAPRPGEVDGVDYFFVSKEEFEEMIENGEFLEWAEVFGNYYGTPRS 86

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 345 TVHQIHKQNKIAILDIEPQTLKIVRtaELSPFIV--FIAPTDQgtqtEALQQ-LQK---DS-EAIRS---------QYAH 408
Cdd:PRK00300  87 PVEEALAAGKDVLLEIDWQGARQVK--KKMPDAVsiFILPPSL----EELERrLRGrgtDSeEVIARrlakareeiAHAS 160

                        170
                 ....*....|....*....
gi 262118259 409 YFDLSLVNNGVDETLKKLQ 427
Cdd:PRK00300 161 EYDYVIVNDDLDTALEELK 179

PDZ domain of membrane palmitoylated protein 6 (MPP6), MPP2, and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain of MPP6, MPP2, and related domains. MPP6 (also known as MAGUK p55 subfamily member, Protein associated with Lin-7, 2 (PALS2), Veli-associated MAGUK 1, and VAM-1) is a membrane-associated guanylate kinase (MAGUK)-like protein. MPP6 is a regulator of Lin-7 expression and localization. MPP6 is also known to bind cell-adhesion protein, nectin-like molecule-2 (Necl-2), and localize to the basolateral plasma membrane in mammalian epithelial cells. MPP2 (also known as MAGUK p55 subfamily member 2) is a postsynaptic protein that links SynCAM1 cell adhesion molecules to core components of the postsynaptic density. Other members of this family include the Drosophila Vari protein, an essential basolateral septate junction protein which interacts with the cell-adhesion protein neurexin IV. PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This MPP6-MPP2-like family domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged in the order: beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259  70 RLIQFEKVTEEPMGITLKLNEKQsCTVARILHGGMIHRQGSLHVGDEILEINGTNVtnHSVDQLQKAMKETKGMISLKVI 149
Cdd:cd10832    1 RMVGIRKNPGEPLGVTVRLEEGE-LVIARILHGGMIDRQGLLHVGDIIKEVNGVPV--GSPEQLQEMLKNASGSVTLKIL 77

                 .
gi 262118259 150 P 150
Cdd:cd10832   78 P 78

PDZ domain; PDZ domains are found in diverse signaling proteins.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259   71 LIQFEKVTEEPMGITLKLNEKQS---CTVARILHGGMIHRQGsLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMISLK 147
Cdd:pfam00595   1 QVTLEKDGRGGLGFSLKGGSDQGdpgIFVSEVLPGGAAEAGG-LKVGDRILSINGQDVENMTHEEAVLALKGSGGKVTLT 79

                  ..
gi 262118259  148 VI 149
Cdd:pfam00595  80 IL 81

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.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|...
gi 262118259 150 PNQQSRLPAlQEAGLKFATGDIIQIINKDDSNWWQGRVEGSSKESAGLIPSPE 202
Cdd:cd11862   10 PEEDPLIPC-KEAGLSFKKGDILQIVNQDDPNWWQARKVGDPNGRAGLIPSQD 61

canonical PDZ domain; Canonical PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain. PDZ domains usually bind to short specific peptide sequences located at the C-terminal end of their partner proteins known as PDZ binding motifs. These domains can also interact with internal peptide motifs and certain lipids, and can take part in a head-to-tail oligomerization with other PDZ domains. The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. The canonical PDZ domain contains six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged in the order: beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259  71 LIQFEKVTEEPMGITLK--LNEKQSCTVARILHGGMIHRQGSLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMISLKV 148
Cdd:cd00136    1 TVTLEKDPGGGLGFSIRggKDGGGGIFVSRVEPGGPAARDGRLRVGDRILEVNGVSLEGLTHEEAVELLKSAGGEVTLTV 80

guanylate kinase; Provisional

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 265 LVLIGASGVGrshiKNALLSQNPEK---FVYPVPYTTRPPRKSEEDGKEYHFISTEEMTRNISANEFLEFGSYQGNMFGT 341
Cdd:PRK14738  16 VVISGPSGVG----KDAVLARMRERklpFHFVVTATTRPKRPGEIDGVDYHFVTPEEFREMISQNELLEWAEVYGNYYGV 91

                         90       100       110       120       130       140       150       160
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259 342 KFETVHQIHKQNKIAILDIEPQ-TLKIVRTAELSPFIvFIAPTDQGTQTEAL-QQLQKDSEAIRSQYA---------HYF 410
Cdd:PRK14738  92 PKAPVRQALASGRDVIVKVDVQgAASIKRLVPEAVFI-FLAPPSMDELTRRLeLRRTESPEELERRLAtapleleqlPEF 170

                        170
                 ....*....|....*....
gi 262118259 411 DLSLVN--NGVDETLKKLQ 427
Cdd:PRK14738 171 DYVVVNpeDRLDEAVAQIM 189

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.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 262118259 150 PNQQSRLPAlQEAGLKFATGDIIQIINKDDSNWWQGRVEGSSKESAGLIPS 200
Cdd:cd12033   10 PNEDKAIPC-KEAGLSFKKGDILQIMSQDDATWWQAKHEGDANPRAGLIPS 59

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.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|..
gi 262118259 150 PNQQSRLPAlQEAGLKFATGDIIQIINKDDSNWWQG-RVEGSskeSAGLIPS 200
Cdd:cd12037   10 PSSDSLIPC-KEAGLKFRAGDLLQIVNQEDPNWWQAcHVEGG---SAGLIPS 57

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.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|....*
gi 262118259 160 QEAGLKFATGDIIQIINKDDSNWWQGRVEGSSKES--AGLIPSPE 202
Cdd:cd12036   19 RELGLSFQKGDILHVISQEDPNWWQAYREGEEDNQslAGLIPSKS 63

Src Homology 3 domain of Membrane Protein, Palmitoylated 4 (or MAGUK p55 subfamily member 4); MPP4, also called Disks Large homolog 6 (DLG6) or Amyotrophic lateral sclerosis 2 chromosomal region candidate gene 5 protein (ALS2CR5), is a retina-specific scaffolding protein that plays a role in organizing presynaptic protein complexes in the photoreceptor synapse, where it localizes to the plasma membrane. It is required in the proper localization of calcium ATPases and for maintenance of calcium homeostasis. MPP4 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.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|.
gi 262118259 150 PNQQSRLPALqEAGLKFATGDIIQIINKDDSNWWQGRVEGSSKESAGLIPS 200
Cdd:cd12034   10 PQQDPSIPCA-DAGLPFRKGDILQIVDQNDSLWWQARKLSDLAACAGLIPS 59

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.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|...
gi 262118259 160 QEAGLKFATGDIIQIINKDDSNWWQGR--VEGSskeSAGLIPS 200
Cdd:cd12038   19 KEAGLKFSKGEILQIVNREDPNWWQAShvKEGG---SAGLIPS 58

PDZ domain of LIM Kinase (LIMK) family, and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain of the LIMK protein family, and related domains. The LIMK family is composed of LIMK1 and LIMK2, which are common downstream effectors of several signalization pathways and function as signaling nodes that control cytoskeleton dynamics through the phosphorylation of cofilin family proteins. They also control microtubule dynamics. The LIMK1 PDZ domain binds tubulin and nischarin. LIMK1 also binds a carboxy-terminal motif of membrane type 1-matrix metalloproteinase (MT1-MMP, also known as MMP14) having features of a PDZ domain-binding site; MT1-MMP is a major protease involved in dissemination of carcinoma cells during cancer progression. PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This LIMK-like family domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged in the order: beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 262118259  69 VRLIQFEKVTEEPMGITLKLNEKQS--CTVARILHGGMIHRQG---SLHVGDEILEINGTNVTNHSVDQLQKAMKETKGM 143
Cdd:cd06754    4 VTLVSIPPTPEGKRGFSVSVEKGCSehSHTVRVSELDPMHLSPdlkSLHVGDRILEVNGTPVRDLSLEEIDDLIQSTSKT 83

                 ....*
gi 262118259 144 ISLKV 148
Cdd:cd06754   84 LQLTI 88

PDZ domain 4 of membrane-associated guanylate kinase inverted 1 (MAGI-1), MAGI-2, and MAGI-3, and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain 4 of MAGI1, 2, 3 (MAGI is also known as Membrane-associated guanylate kinase, WW and PDZ domain-containing protein) and related domains. MAGI proteins have been implicated in the control of cell migration and invasion through altering the activity of phosphatase and tensin homolog (PTEN) and modulating Akt signaling. Four MAGI proteins have been identified (MAGI1-3 and MAGIX). MAGI1-3 have 6 PDZ domains and bind to the C-terminus of PTEN via their PDZ2 domain. MAGIX has a single PDZ domain that is related to MAGI1-3 PDZ domain 5. Other binding partners for MAGI1 include JAM4, C-terminal tail of high risk HPV-18 E6, megalin, TRAF6, Kir4.1 (basolateral K+ channel subunit), and cadherin 23; for MAGI2, include DASM1, dendrin, axin, beta- and delta-catenin, neuroligin, hyperpolarization-activated cation channels, beta1-adrenergic receptors, NMDA receptor, and TARPs; and for MAGI3 includes LPA2. PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This MAGI family PDZ4 domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2); arranged as beta-strands A, -B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50        60
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*..
gi 262118259  84 ITLKLNEKQSCTVARILHGGMIHRQGSLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMISLKVIP 150
Cdd:cd06734   18 IISSVNKKSGSKIGRIIPGSPADRCGQLKVGDRILAVNGISILNLSHGDIVNLIKDSGLSVTLTIVP 84

PDZ domain of partitioning defective 6 (Par6), Drosophila Rho GTPase-activating protein 100F (RhoGAP100F), and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain of Par6 (also known as PAR6 or Par-6), RhoGAP100F, and related domains. Par6 is part of a conserved machinery that directs metazoan cell polarity, a process necessary for the function of diverse cell types. Par6 forms a cell polarity-regulatory complex with atypical protein kinase C (aPKC) and Par3. Par6 can also directly associate with PALS1 (proteins associated with Lin7, also known as Stardust) providing a link between the Par3/aPKC/Par6 complex and the PALS1-PATJ (protein-associated TJ) complex. Binding partners of the Par6-PDZ domain include Par3, PALS1/Stardust; leucine-rich repeat-containing protein netrin-G ligand-2 (NGL-2), human crumbs (CRB3) involve in the morphogenesis of the tight junctions in mammalian epithelial cells, and PAR-6 co-operates with the Par6 semi-CRIB domain to bind CDC42. CDC42 regulates the Par6 PDZ domain through an allosteric CRIB-PDZ transition. Drosophila RhoGAP100F, also known as synapse defective protein 1 homolog (syd-1 homolog), is a GTPase activator for the Rho-type GTPases by converting them to an inactive GDP-bound form. The RhoGAP100F-PDZ domain binds the neurexin C terminus to control synapse formation at the Drosophila neuromuscular junction. PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This Par6-like family domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged in the order: beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta-strand F.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*
gi 262118259  96 VARILHGGMIHRQGSLHVGDEILEINGTNVTNHSVDQLQKAMKETKGMIsLKVIP 150
Cdd:cd06718   31 ISRLVLGSLADSTGLLAVGDEILEVNGVEVTGKSLDDVTDMMVAPTRLI-ITVKP 84

Src Homology 3 domain of Disks large homolog proteins; The DLG-like proteins are scaffolding proteins that cluster at synapses and are also called PSD (postsynaptic density)-95 proteins or SAPs (synapse-associated proteins). They play important roles in synaptic development and plasticity, cell polarity, migration and proliferation. They are members of 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). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. DLG-like proteins contain three PDZ domains and varying N-terminal regions. All DLG proteins exist as alternatively-spliced isoforms. Vertebrates contain four DLG proteins from different genes, called DLG1-4. DLG4 and DLG2 are found predominantly at postsynaptic sites and they mediate surface ion channel and receptor clustering. DLG3 is found axons and some presynaptic terminals. DLG1 interacts with AMPA-type glutamate receptors and is critical in their maturation and delivery to synapses. The SH3 domain of DLG4 binds and clusters the kainate subgroup of glutamate receptors via two proline-rich sequences in their C-terminal tail. It also binds AKAP79/150 (A-kinase anchoring protein). SH3 domains are protein interaction domains that bind to proline-rich ligands with moderate affinity and selectivity, preferentially to PxxP motifs. They play versatile and diverse roles in the cell including the regulation of enzymes, changing the subcellular localization of signaling pathway components, and mediating the formation of multiprotein complex assemblies.

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                 ....*....|....*....|....*....|....*....|....*....|....
gi 262118259 149 IPNQQSRLPAlqeAGLKFATGDIIQIINKDDSNWWQGRVEGSSKESA--GLIPS 200
Cdd:cd11861    9 DPSRDSGLPS---QGLSFKFGDILHVTNASDDEWWQARRVTPNGEEEevGVIPS 59

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.

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                   ....*....|....*....|....*....|....*..
gi 262118259   164 LKFATGDIIQIINKDDSNWWQGRVEGSSKesaGLIPS 200
Cdd:smart00326  19 LSFKKGDIITVLEKSDDGWWKGRLGRGKE---GLFPS 52

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.

                         10        20        30
                 ....*....|....*....|....*....|....*..
gi 262118259 164 LKFATGDIIQIINKDDSNWWQGRVEGssKEsaGLIPS 200
Cdd:cd11827   16 LSFNEGDIIEILKEDPSGWWTGRLRG--KE--GLFPG 48

Src Homology 3 domain of Disks Large homolog 3; DLG3, also called synapse-associated protein 102 (SAP102), is a scaffolding protein that clusters at synapses and plays an important role in synaptic development and plasticity. Mutations in DLG3 cause midgestational embryonic lethality in mice and may be associated with nonsyndromic X-linked mental retardation in humans. It interacts with the NEDD4 (neural precursor cell-expressed developmentally downregulated 4) family of ubiquitin ligases and promotes apical tight junction formation. DLG3 is a member of 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). The GuK domain in MAGUK proteins is enzymatically inactive; instead, the domain mediates protein-protein interactions and associates intramolecularly with the SH3 domain. DLG3 contains three PDZ 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.

                         10        20        30        40        50
                 ....*....|....*....|....*....|....*....|....*....|....*.
gi 262118259 153 QSRLPALQEAGLKFATGDIIQIINKDDSNWWQGRV---EGSSkESAGLIPSPELQE 205
Cdd:cd12029   13 RTRDSCLPSQGLSFSYGDILHVINASDDEWWQARLvtpHGES-EQIGVIPSKKRVE 67

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.

                         10        20        30        40
                 ....*....|....*....|....*....|....*....|...
gi 262118259 158 ALQEAGLKFATGDIIQIINKDDSNWWQGRVEGSSkesaGLIPS 200
Cdd:cd11996   11 ANNEDELSFSKGQLINVLNKDDPDWWQGEINGVT----GLFPS 49

PDZ domain 1 of amyloid-beta A4 precursor protein-binding family A member 1 (APBA1), APBA2, APBA3, and related domains; PDZ (PSD-95 (Postsynaptic density protein 95), Dlg (Discs large protein), and ZO-1 (Zonula occludens-1)) domain 1 of APBA1, APBA2, APBA3, and related domains. The APBA/X11/Mint protein family includes three members: neuron specific APBA1 (also known as X11alpha and Mint1) and APBA2 (also known as X11beta and Mint2), and the ubiquitously expressed APBA3 (also known as (X12gamma and Mint3). They are involved in regulating neuronal signaling, trafficking and plasticity. They contain two PDZ domains (PDZ1 and PDZ2) which bind a variety of proteins: Arf GTPases (APBA1 and APBA2 PDZ2) and neurexin (APBA1 and APBA2 PDZ1 and 2), which are involved in vesicle docking and exocytosis; alpha1B subunit of N-type Ca2+ channel (APBA1 PDZ1) that is involved in ion channels; KIF17 (APBA1 PDZ1) that is involved in transport and traffic; and Alzheimer's disease related proteins such as APP (APBA3 PDZ2), CCS (APBA1 PDZ2), NF-kappa-B/p65 (APBA2 PDZ2), presenilin-1 (APBA1 and APBA2 PDZ1 and PDZ2). PDZ domains usually bind in a sequence-specific manner to short peptide sequences located at the C-terminal end of their partner proteins (known as PDZ binding motifs). The PDZ superfamily includes canonical PDZ domains as well as those with circular permutations and domain swapping mediated by beta-strands. This APBA1,2,3-like family domain is a canonical PDZ domain containing six beta-strands A-F and two alpha-helices (alpha-helix 1 and 2), arranged as beta-strands A, B, C, alpha-helix 1, beta-strands D, E, alpha-helix 2 and beta- strand F.

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gi 262118259  72 IQFEKVTEEPMGITLKLNEKQS----CTVARILHGGMIHRQGSLHVGDEILEINGTNVTNHSVDQLQKAMKETK 141
Cdd:cd06720    3 VVVEKQKGEILGVVIVESGWGSllptVVVANMMPGGPAARSGKLNIGDQIMSINGTSLVGLPLSTCQAIIKNLK 76