Immunoglobulin like; IG domains that cannot be classified into one of IGv1, IGc1, IGc2, IG.

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 210033196    28 PPGGWVMEGDKLVLICSVDrVTGNITYFWYRGALGFQLETK----TQPSLTAEFEISDMKQSDADQYYCAANDGH 98
Cdd:smart00410   1 PPSVTVKEGESVTLSCEAS-GSPPPEVTWYKQGGKLLAESGrfsvSRSGSTSTLTISNVTPEDSGTYTCAATNSS 74

Immunoglobulin like; IG domains that cannot be classified into one of IGv1, IGc1, IGc2, IG.

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 210033196    28 PPGGWVMEGDKLVLICSVDrVTGNITYFWYRGALGFQLETK----TQPSLTAEFEISDMKQSDADQYYCAANDGH 98
Cdd:smart00410   1 PPSVTVKEGESVTLSCEAS-GSPPPEVTWYKQGGKLLAESGrfsvSRSGSTSTLTISNVTPEDSGTYTCAATNSS 74

Immunoglobulin domain; Members of the immunoglobulin superfamily are found in hundreds of proteins of different functions. Examples include antibodies, the giant muscle kinase titin and receptor tyrosine kinases. Immunoglobulin-like domains may be involved in protein-protein and protein-ligand interactions.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 210033196   28 PPGGWVMEGDKLVLICSVDRVTGNITYFWYRGALGFQLETKTQPSL----TAEFEISDMKQSDADQYYCAANDGHDPIPS 103
Cdd:pfam00047   3 PPTVTVLEGDSATLTCSASTGSPGPDVTWSKEGGTLIESLKVKHDNgrttQSSLLISNVTKEDAGTYTCVVNNPGGSATL 82

                  .
gi 210033196  104 E 104
Cdd:pfam00047  83 S 83

Immunoglobulin variable domain (IgV); The members here are composed of the immunoglobulin variable domain (IgV). The IgV family contains the standard Ig superfamily V-set AGFCC'C"/DEB domain topology, and are components of immunoglobulin (Ig) and T cell receptors. The basic structure of Ig molecules is a tetramer of two light chains and two heavy chains linked by disulfide bonds. In Ig, each chain is composed of one variable domain (IgV) and one or more constant domains (IgC); these names reflect the fact that the variability in sequences is higher in the variable domain than in the constant domain. Within the variable domain, there are regions of even more variability called the hypervariable or complementarity-determining regions (CDRs) which are responsible for antigen binding. A predominant feature of most Ig domains is the disulfide bridge connecting 2 beta-sheets with a tryptophan residue packed against the disulfide bond. Ig superfamily (IgSF) domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. Typically, the V-set domains have A, B, E and, D strands in one sheet and A', G, F, C, C', and C" strands in the other.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 210033196  28 PPGGWVMEGDKLVLICSVDrvTGNITY--FWYRGALGFQLE-------------------------TKTQPSLTaefeIS 80
Cdd:cd00099    5 PRSLSVQEGESVTLSCEVS--SSFSSTyiYWYRQKPGQGPEfliylssskgktkggvpgrfsgsrdGTSSFSLT----IS 78

                         90       100       110       120
                 ....*....|....*....|....*....|....*....|....*..
gi 210033196  81 DMKQSDADQYYCAANDGHdpipselvsihvrvpvSRPVLTFGdSGTQ 127
Cdd:cd00099   79 NLQPEDSGTYYCAVSESG----------------GTDKLTFG-SGTR 108

Immunoglobulin like; IG domains that cannot be classified into one of IGv1, IGc1, IGc2, IG.

                           10        20        30        40        50        60        70
                   ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*
gi 210033196    28 PPGGWVMEGDKLVLICSVDrVTGNITYFWYRGALGFQLETK----TQPSLTAEFEISDMKQSDADQYYCAANDGH 98
Cdd:smart00410   1 PPSVTVKEGESVTLSCEAS-GSPPPEVTWYKQGGKLLAESGrfsvSRSGSTSTLTISNVTPEDSGTYTCAATNSS 74

Immunoglobulin domain; The members here are composed of the immunoglobulin (Ig) domain found in the Ig superfamily. The Ig superfamily is a heterogenous group of proteins, built on a common fold comprised of a sandwich of two beta sheets. Members of this group are components of immunoglobulin, neuroglia, cell surface glycoproteins, including T-cell receptors, CD2, CD4, CD8, and membrane glycoproteins, including butyrophilin and chondroitin sulfate proteoglycan core protein. A predominant feature of most Ig domains is a disulfide bridge connecting the two beta-sheets with a tryptophan residue packed against the disulfide bond. Ig superfamily (IgSF) domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. Typically, the V-set domains have A, B, E, and D strands in one sheet and A', G, F, C, C' and C" in the other. The structures in C1-set are smaller than those in the V-set; they have one beta sheet that is formed by strands A, B, E, and D and the other by strands G, F, C, and C'. Moreover, a C1-set Ig domain contains a short C' strand (three residues) and lacks A' and C" strand. Unlike other Ig domain sets, C2-set structures do not have a D strand. Like the V-set Ig domains, members of the I-set have a discontinuous A strand, but lack a C" strand.

                         10        20        30        40        50        60        70
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|.
gi 210033196 134 VELHCKAlRGSPPIFYQFYHESIILGNSSAPSGGGASFNFSLT-----AEHSGNFSCEASNGQGAQRSEVV 199
Cdd:cd00096    1 VTLTCSA-SGNPPPTITWYKNGKPLPPSSRDSRRSELGNGTLTisnvtLEDSGTYTCVASNSAGGSASASV 70

Immunoglobulin domain; Members of the immunoglobulin superfamily are found in hundreds of proteins of different functions. Examples include antibodies, the giant muscle kinase titin and receptor tyrosine kinases. Immunoglobulin-like domains may be involved in protein-protein and protein-ligand interactions.

                          10        20        30        40        50        60        70        80
                  ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 210033196   28 PPGGWVMEGDKLVLICSVDRVTGNITYFWYRGALGFQLETKTQPSL----TAEFEISDMKQSDADQYYCAANDGHDPIPS 103
Cdd:pfam00047   3 PPTVTVLEGDSATLTCSASTGSPGPDVTWSKEGGTLIESLKVKHDNgrttQSSLLISNVTKEDAGTYTCVVNNPGGSATL 82

                  .
gi 210033196  104 E 104
Cdd:pfam00047  83 S 83

Second Ig-like domain of Junctional adhesion molecule-1 (JAM1); a member of the I-set of IgSF domains; The members here are composed of the second Ig-like domain of Junctional adhesion molecule-1 (JAM1). JAM1 is an immunoglobulin superfamily (IgSF) protein with two Ig-like domains in its extracellular region; it plays a role in the formation of endothelial and epithelial tight junction and acts as a receptor for mammalian reovirus sigma-1. The IgSF is a heterogenous group of proteins, built on a common fold comprised of a sandwich of two beta sheets. The two sheets are linked together by a conserved disulfide bond between B strand and F strand. IgSF domains can be divided into 4 main classes based on their structures and sequences: the Variable (V), Constant 1 (C1), Constant 2 (C2), and Intermediate (I) sets. The second Ig-like domain of JAM1 is a member of the I-set Ig domains, having A-B-E-D strands in one beta-sheet and A'-G-F-C-C' in the other. Like the V-set Ig domains, the A strand of the I-set is discontinuous but lacks a C" strand. I-set domains are found in several cell adhesion molecules (such as VCAM, ICAM, and MADCAM), and are also present in numerous other diverse protein families, including several tyrosine-protein kinase receptors.

                         10        20        30        40        50        60        70        80
                 ....*....|....*....|....*....|....*....|....*....|....*....|....*....|....*....|
gi 210033196 126 TQAVLGDLVELHCKALRGSPPIFYQFYHESIILGNSSAPSGGGASFNFSL------------TAEHSGNFSCEASNGQG- 192
Cdd:cd20950    7 SSATIGNRAVLTCSEPDGSPPSEYTWFKDGVVMPTNPKSTRAFSNSSYSLdpttgelvfdplSASDTGEYSCEARNGYGt 86

                 ....*....
gi 210033196 193 AQRSEVVAL 201
Cdd:cd20950   87 PMRSNAVRM 95