May be involved in endocytic processes and/or other transport pathways mediated by vesicle trafficking. May interact functionally with ROP protein. Ras proteins bind GDP/GTP and possess intrinsic GTPase activity. GTP + H2O = GDP + H(+) + phosphate Alternates between an inactive form bound to GDP and an active form bound to GTP. Activated by a guanine nucleotide-exchange factor (GEF) and inactivated by a GTPase-activating protein (GAP). Interacts with hzg. A uniform expression is seen in unfertilized eggs, embryos, larvae, pupae and adult flies. Expression during embryogenesis is restricted to the CNS and the Garland cells, a small group of nephrocytes that takes up waste materials from the hemolymph by endocytosis. In post-embryonic stages, expression is seen in the larval salivary glands and the CNS, and in the adult CNS and reproductive systems. Belongs to the small GTPase superfamily. Ras family.