Inhibits signal transduction by increasing the GTPase activity of G protein alpha subunits thereby driving them into their inactive GDP-bound form. Binds to G(i) alpha-1, G(i) alpha-2, G(i) alpha-3 and G(q) alpha.
Subcellular locations: Cytoplasm
Expressed in peripheral leukocytes, bone marrow, platelet, spleen and fetal liver.