Predicted to enable SNARE binding activity. Predicted to be involved in several processes, including anterograde synaptic vesicle transport; endosome to lysosome transport; and lysosome localization. Predicted to act upstream of or within several processes, including lysosomal lumen acidification; terminal button organization; and vesicle organization. Located in secretory granule. Is active in synaptic vesicle. Orthologous to human SNAPIN (SNAP associated protein). [provided by Alliance of Genome Resources, Apr 2022]