Plays a role in transport between endoplasmic reticulum and Golgi. In pancreatic beta cells, required to transport proinsulin from endoplasmic reticulum into the Golgi.
Subcellular locations: Endoplasmic reticulum membrane, Golgi apparatus, Cis-Golgi network membrane, Cytoplasmic vesicle, COPII-coated vesicle
Enriched at the endoplasmic reticulum exit sites (By similarity). Incorporated into COPII-coated vesicles (By similarity).