GTPase activator for the small GTPases RhoA and Cdc42 by converting them to an inactive GDP-bound state. Essential for PTKB2 regulation of cytoskeletal organization via Rho family GTPases. Inhibits PAK2 proteolytic fragment PAK-2p34 kinase activity and changes its localization from the nucleus to the perinuclear region. Stabilizes PAK-2p34 thereby increasing stimulation of cell death (By similarity).
Cytoplasm . Cytoplasm, perinuclear region . Cell membrane . Association to cell membrane is dependent on PH domain. .
High levels of expression in heart and skeletal muscle.
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