GTP-binding protein involved in protein trafficking; may modulate vesicle budding and uncoating within the Golgi apparatus.
(Microbial infection) Functions as an allosteric activator of the cholera toxin catalytic subunit, an ADP-ribosyltransferase.
Subcellular locations: Golgi apparatus, Cytoplasm, Perinuclear region, Membrane, Golgi apparatus, Trans-Golgi network membrane