Anti-Synaptophysin Antibody, clone SP15 (Ascites Free) clone SP15, from mouse

Synaptophysin (UniProt P08247; also known as Major synaptic vesicle protein p38) is encoded by the SYP (also known as MRX96, MRXSYP) gene (Gene ID 6855) in human. Synaptophysin is a 38 kDa four-transmembrane glycoprotein on synaptic vesicle (SV) with both its N- and C-termini exposed cytoplasmically. Synaptophysin forms homomultimers in the SV membrane and is heavily phosphorylated on tyrosine residues in its C-terminal pentapeptide repeats. Synaptophysin is also known to interact with SV v-SNARE protein synaptobrevin II (sybII) when sybII is not engaged with other SNARE proteins, suggesting a role of synaptophysin in sybII retrieval during SV endocytosis. Consistently, synaptophysin-knockout neurons display reduced levels of sybII at their nerve terminals.