Predicted to enable SNARE binding activity; clathrin heavy chain binding activity; and phosphatidylinositol binding activity. Predicted to be involved in clathrin-dependent endocytosis and vesicle budding from membrane. Predicted to act upstream of or within clathrin coat assembly. Predicted to be active in clathrin-coated pit; clathrin-coated vesicle; and synaptic vesicle. Predicted to be extrinsic component of presynaptic endocytic zone membrane. Orthologous to human SNAP91 (synaptosome associated protein 91).