Enables syntaxin binding activity. Involved in chemical synaptic transmission and positive regulation of neurotransmitter secretion. Located in axon. Expressed in head neurons; intestine; nervous system;
uv1; and ventral cord neurons. Used to study alcohol use disorder and developmental and epileptic encephalopathy. Human ortholog(s) of this gene implicated in West syndrome; developmental and epileptic encephalopathy 4; and familial hemophagocytic lymphohistiocytosis 5. Is an ortholog of human STXBP1 (syntaxin binding protein 1).