Required for vesicular transport between the endoplasmic reticulum and the Golgi apparatus (PubMed:8455721). Together with GNA12 promotes CDH5 localization to plasma membrane (By similarity). Interacts with PRKCABP, and disrupts the interaction between GRIA2 and PRKCABP, leading to the internalization of GRIA2. Found in a complex with VAMP8. Component of a SNARE-like complex that contains at least ZW10, USE1L, RINT1, STX18 and NAPA/SNAP-alpha. Interacts with VTI1A. Interacts with STX12. Interacts with GNA12 (via N-terminus); the interaction promotes CDH5 localization to plasma membrane. Widely expressed. Highest expression in brain. Belongs to the SNAP family.