?cl21504: EGF_CA Superfamily (this model, PSSM-Id:389777 is obsolete and has been replaced by 473889)
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.
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Jiyao W et al.(2023). "The conserved domain database in 2023.",