Required for vesicular transport between the endoplasmic reticulum and the Golgi apparatus (Probable). Together with GNA12 promotes CDH5 localization to plasma membrane (PubMed:15980433). Interacts with PRKCABP, and disrupts the interaction between GRIA2 and PRKCABP, leading to the internalization of GRIA2 (By similarity). Found in a complex with VAMP8 (By similarity). Component of a SNARE-like complex that contains at least ZW10, USE1L, RINT1, STX18 and NAPA/SNAP-alpha (PubMed:15029241). Interacts with VTI1A (By similarity). Interacts with STX12 (By similarity). Interacts with GNA12 (via N-terminus); the interaction promotes CDH5 localization to plasma membrane (PubMed:15980433). Belongs to the SNAP family.