Description_x000D_ Biochem/physiol Actions_x000D_ PAK1 is a member of the p21-activated kinases (PAKs) which have been implicated in the regulation of gene transcription, cell morphology, motility and apoptosis. PAKs are serine/threonine kinases which bind to and are activated by small GTPases, CDC42 (cell division cycle 42) and RAC. PAK1 belongs to the Group I PAKs which also includes PAK2 and PAK3. PAK1 is a key regulator of the actin cytoskeleton, adhesion and cell motility._x000D_ Physical form_x000D_ Supplied in 50 mM Tris-HCl, pH 7.5, with 150 mM NaCl, 0.2 5mM DTT, 0.1 mM EGTA, 0.1 mM EDTA, 0.1 mM PMSF, and 25% glycerol._x000D_ Legal Information_x000D_ PRECISIO is a registered trademark of Sigma-Aldrich Co. LLC