Synaptophysin is a calcium-binding and integral membrane glycoprotein present in presynaptic vesicles in almost all neurons. Synaptophysin has four transmembrane domains and it forms a complex with dynamin at high calcium concentrations suggesting an involvement in synaptic vesicle endocytosis. It is also involved in the regulation of short-term and long-term synaptic plasticity. Synaptophysin is currently the most widely used marker for nerve terminals and for differentiating neuroendocrine tumors. Mutations in the gene can result in mental retardation, X-linked 96.
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Protein Aliases: BM89 antigen; Major synaptic vesicle protein p38; Synaptophysin; Syp I
Gene Aliases: A230093K24Rik; AI848995; MRX96; MRXSYP; p38; Syn; SYP; Syp1
Molecular Function: membrane trafficking regulatory protein