Enables syntaxin-1 binding activity. Involved in protein-containing complex assembly. Located in apical plasma membrane; clathrin-coated vesicle membrane; and recycling endosome. Part of SNARE complex. Is integral component of synaptic vesicle membrane. Orthologous to human VAMP3 (vesicle associated membrane protein 3). [provided by Alliance of Genome Resources, Apr 2022]