Enables SH2 domain binding activity and protein N-terminus binding activity. Involved in positive regulation of transporter activity and regulated exocytosis. Located in neuromuscular junction. Is active in synaptic vesicle. Is expressed in several structures, including central nervous system; eye; and peripheral nervous system ganglion. Orthologous to human SYNGR3 (synaptogyrin 3). [provided by Alliance of Genome Resources, Apr 2022]