Tags: Protein.
Ras GTPase-activating protein 4 is an enzyme that in humans is encoded by the RASA4 gene.This gene encodes a member of the GAP1 family of GTPase-activating proteins that suppresses the Ras/mitogen-activated protein kinase pathway in response to Ca(2+). Stimuli that increase intracellular Ca(2+) levels result in the translocation of this protein to the plasma membrane where it activates Ras GTPase activity.