Enables syntaxin binding activity. Involved in regulation of synaptic vesicle exocytosis. Acts upstream of or within glucose homeostasis and regulation of secretion by cell. Located in plasma membrane. Is active in neuromuscular junction and neuronal dense core vesicle. Is expressed in several structures, including alimentary system; brain; male reproductive gland or organ; spinal cord; and trigeminal nerve. Orthologous to human STXBP5L (syntaxin binding protein 5L). [provided by Alliance of Genome Resources, Apr 2022]