Calcium-binding EGF-like domain, present in a large number of membrane-bound and extracellular (mostly animal) proteins. Many of these proteins require calcium for their biological function and calcium-binding sites have been found to be located at the N-terminus of particular EGF-like domains; calcium-binding may be crucial for numerous protein-protein interactions. Six conserved core cysteines form three disulfide bridges as in non calcium-binding EGF domains, whose structures are very similar. EGF_CA can be found in tandem repeat arrangements.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|..
gi 2462559612 134 DIDECASSNGTLCAHICINTLGSYRCECREGYIreddGKTCT 175
Cdd:cd00054     1 DIDECASGNPCQNGGTCVNTVGSYRCSCPPGYT----GRNCE 38

Calcium-binding EGF-like domain, present in a large number of membrane-bound and extracellular (mostly animal) proteins. Many of these proteins require calcium for their biological function and calcium-binding sites have been found to be located at the N-terminus of particular EGF-like domains; calcium-binding may be crucial for numerous protein-protein interactions. Six conserved core cysteines form three disulfide bridges as in non calcium-binding EGF domains, whose structures are very similar. EGF_CA can be found in tandem repeat arrangements.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|..
gi 2462559612 134 DIDECASSNGTLCAHICINTLGSYRCECREGYIreddGKTCT 175
Cdd:cd00054     1 DIDECASGNPCQNGGTCVNTVGSYRCSCPPGYT----GRNCE 38

VWA_Matrilin: In cartilaginous plate, extracellular matrix molecules mediate cell-matrix and matrix-matrix interactions thereby providing tissue integrity. Some members of the matrilin family are expressed specifically in developing cartilage rudiments. The matrilin family consists of at least four members. All the members of the matrilin family contain VWA domains, EGF-like domains and a heptad repeat coiled-coiled domain at the carboxy terminus which is responsible for the oligomerization of the matrilins. The VWA domains have been shown to be essential for matrilin network formation by interacting with matrix ligands.

                          10        20        30        40
                  ....*....|....*....|....*....|....*....|....*....
gi 2462559612 125 RKREKPYCLDIDECASSNGTlCAHICINTLGSYRCECREGYIREDDGKT 173
Cdd:cd01475   177 KKFQGKICVVPDLCATLSHV-CQQVCISTPGSYLCACTEGYALLEDNKT 224

Epidermal growth factor domain, found in epidermal growth factor (EGF) presents in a large number of proteins, mostly animal; the list of proteins currently known to contain one or more copies of an EGF-like pattern is large and varied; the functional significance of EGF-like domains in what appear to be unrelated proteins is not yet clear; a common feature is that these repeats are found in the extracellular domain of membrane-bound proteins or in proteins known to be secreted (exception: prostaglandin G/H synthase); the domain includes six cysteine residues which have been shown to be involved in disulfide bonds; the main structure is a two-stranded beta-sheet followed by a loop to a C-terminal short two-stranded sheet; Subdomains between the conserved cysteines vary in length; the region between the 5th and 6th cysteine contains two conserved glycines of which at least one is present in most EGF-like domains; a subset of these bind calcium.

                          10        20        30
                  ....*....|....*....|....*....|..
gi 2462559612 137 ECASSNGTLCAHICINTLGSYRCECREGYIRE 168
Cdd:cd00053     1 ECAASNPCSNGGTCVNTPGSYRCVCPPGYTGD 32