cofactor:Binds 3 calcium ions per subunit. The ions are bound to the C2 domains. ,Domain:The first C2 domain mediates Ca (2+) -dependent phospholipid binding. ,Domain:The second C2 domain mediates interaction with SV2A and STN2. ,Function:May have a regulatory role in the membrane interactions during trafficking of synaptic vesicles at the active zone of the synapse. It binds acidic phospholipids with a specificity that requires the presence of both an acidic head group and a diacyl backbone. A Ca (2+) -dependent interaction between synaptotagmin and putative receptors for activated protein kinase C has also been reported. It can bind to at least three additional proteins in a Ca (2+) -independent manner; these are neurexins , syntaxin and AP2. ,similarity:Belongs to the synaptotagmin family. ,similarity:Contains 2 C2 domains. ,subcellular location:Synaptic vesicles and chromaffin granules. ,subunit:Homotetramer (Probable) . Interacts with SCAMP5 , STN2 , SV2A , SV2B , SV2C and RIMS1. Forms a complex with SV2B , syntaxin 1 and SNAP25. ,
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