Intracellular vesicle trafficking and protein transport. May play a role in adaptation to stress by recylcing macromolecules in specific cellular compartments. By hydrogen peroxide and infection with an incompatible race of P.syringae and B.cinerea. Plants overexpressing RABG3E exhibit accelerated endocytosis, increased tolerance to salt and osmotic stresses and reduced accumulation of reactive oxygen species during salt stress. Belongs to the small GTPase superfamily. Rab family.