Claim: The protein encoded by this gene stimulates the GTPase (a large family of hydrolase enzymes) activity of normal RAS p21 but not its oncogenic counterpart, and can be found in the cytoplasm.
Evidence: The gene product stimulates the GTPase activity of normal RAS p21 but not its oncogenic counterpart. The protein encoded by this gene is located in the cytoplasm and is part of the GAP1 family of GTPase-activating proteins. GTPases are a large family of hydrolase enzymes that bind to the nucleotide guanosine triphosphate (GTP) and hydrolyze it to guanosine diphosphate (GDP).