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
                ....*....|....*....|....*....|....*..
gi 46397353 143 DVNECDIPGHCQHGGTCLNLPGSYQCQCLQGFTGQYC 179
Cdd:cd00054   1 DIDECASGNPCQNGGTCVNTVGSYRCSCPPGYTGRNC 37

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
                ....*....|....*....|....*....|....*..
gi 46397353 143 DVNECDIPGHCQHGGTCLNLPGSYQCQCLQGFTGQYC 179
Cdd:cd00054   1 DIDECASGNPCQNGGTCVNTVGSYRCSCPPGYTGRNC 37

Calcium-binding EGF domain;

                          10        20        30
                  ....*....|....*....|....*....|..
gi 46397353   143 DVNECDIPGH-CQHGGTCLNLPGSYQCQCLQG 173
Cdd:pfam07645   1 DVDECATGTHnCPANTVCVNTIGSFECRCPDG 32

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
                ....*....|....*....|....*....|....*..
gi 46397353 143 DVNECDIPGHCQHGGTCLNLPGSYQCQCLQGFTGQYC 179
Cdd:cd00054   1 DIDECASGNPCQNGGTCVNTVGSYRCSCPPGYTGRNC 37

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 46397353 146 ECDIPGHCQHGGTCLNLPGSYQCQCLQGFTGQ 177
Cdd:cd00053   1 ECAASNPCSNGGTCVNTPGSYRCVCPPGYTGD 32

EGF-like domain; There is no clear separation between noise and signal. pfam00053 is very similar, but has 8 instead of 6 conserved cysteines. Includes some cytokine receptors. The EGF domain misses the N-terminus regions of the Ca2+ binding EGF domains (this is the main reason of discrepancy between swiss-prot domain start/end and Pfam). The family is hard to model due to many similar but different sub-types of EGF domains. Pfam certainly misses a number of EGF domains.

                          10        20
                  ....*....|....*....|....*.
gi 46397353   153 CQHGGTCLNLPGSYQCQCLQGFTGQY 178
Cdd:pfam00008   6 CSNGGTCVDTPGGYTCICPEGYTGKR 31