Function: GTPase-activating protein (GAP) for ADP ribosylation factor 1 (ARF1). Hydrolysis of ARF1-bound GTP may lead to dissociation of coatomer from Golgi-derived membranes to allow fusion with target membranes.
Subcellular Location: Cytoplasm. Golgi apparatus membrane. Also found on peripheral punctate structures likely to be endoplasmic reticulum-Golgi intermediate compartment.