May play a role in intracellular membrane fusion. Associates with the BLOC-1 complex. Interacts with BLOC1S6 (By similarity). Forms a complex containing SNAP47, VAMP2 and STX1A. Appears to be exclusively membrane-bound. In primary neurons, widely distributed in both cell bodies and neuronal processes. Ubiquitously expressed with the most abundant expression in the brain. In brain, most highly expressed in the glomerular layer of the olfactory bulb, the cortex, striatum, hippocampus, and colliculi (at protein level). Expressed as early as 10 dpc in developing brain and reaches maximal levels at 18 dpc. Belongs to the SVAP1 family.