GTP-binding protein. Can activate phospholipase D with very low efficiency (By similarity). Important for normal function of the Golgi apparatus. The GTP-bound form interacts with RGPD8 (By similarity). The GTP-bound form directly interacts with ARFIP2; this interaction leads to an increase in the amount of bound GTP at steady state level (By similarity). Binds to SCOC, preferentially in its GTP-bound form. May interact with UNC119 (By similarity). The GTP-bound form interacts with GOLGA1 and GOLGA4. Belongs to the small GTPase superfamily. Arf family.