Required for transport in the endocytic pathway and for correct sorting of the vacuolar hydrolases suggesting a possible intersection of the endocytic with the vacuolar sorting pathway. Interacts with ROY1, YIF1, YIP3, YIP4 and YIP5. Also found in association with endoplasmic reticulum vesicles having SED5 on their surface. Present with 9380 molecules/cell in log phase SD medium. Belongs to the small GTPase superfamily. Rab family.