ADP-ribosylation factor 5, also known as ARF5, is a small guanine nucleotide-binding protein that enhances the enzymatic activities of cholera toxin. ARF-dependent regulatory mechanisms include the coordination of spectrin interactions with golgi membranes and the association of actin to the golgi via rho family-dependent Gprotein localization and WASP/Arp2/3 complexes.