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). No transcripts for RAS2 were detected in any developmental stage. Belongs to the small GTPase superfamily. Ras family.