Involved in vesicular protein trafficking. Mainly functions in the early secretory pathway. Required for trafficking GLL23, a component of the PYK10 complex. May act as a receptor facilitating its packing into COPII carriers and export from the endoplasmic reticulum. Probably oligomerizes with other members of the EMP24/GP25L family (By similarity). Associates with the COPI vesicle coat (coatomer). Associates with the COPII vesicle coat (coatomer). Cycles between the endoplasmic reticulum and Golgi via COPI and COPII dependent pathways. Mainly located in endoplasmic reticulum. The cytoplasmic C-terminal domain contains a functional dilysine-retrieval motif, which is involved in the retrograde Golgi-to-ER transport of the protein. Formation of cytoplasmic bodies. Belongs to the EMP24/GP25L family.