May play a role in regulated exocytosis (PubMed:10383386). May indirectly regulate the activity of the plasma membrane dopamine transporter SLC6A3 and thereby regulate dopamine transport back from the synaptic cleft into the presynaptic terminal (PubMed:19357284). Interacts (via N-terminus) with SLC6A3 (via N-terminus) (PubMed:19357284). May interact with VMAT2 (PubMed:19357284). Found at the neuromuscular synapses. Specifically expressed in brain. Found in the brain across the dorsal and ventral corpus striatum as well as in the cortex. Expression increases during brain development from P2 to adult (at protein level). Belongs to the synaptogyrin family.