The protein encoded by this gene acts as a guanine nucleotide exchange factor for the RHO family of small GTP-binding proteins . It has been shown to bind to and activate RAC1 by exchanging bound GDP for free GTP. The encoded protein, which is found mainly in the cytoplasm, is activated by phosphatidylinositol-3,4,5-trisphosphate and the beta-gamma subunits of heterotrimeric G proteins.
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P-REX1; Phosphatidylinositol 3,4,5-trisphosphate-dependent Rac exchanger 1 protein; phosphatidylinositol-3,4,5-trisphosphate-dependent Rac exchange factor 1; PIP3 dependent Rac exchange factor 1; PREX 1; PREX-1; ptdIns(3,4,5)-dependent Rac exchanger 1