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. Interacts with PKN3 (By similarity). Interacts with caspase-activated PAK2 proteolytic fragment PAK-2p34; the interaction does not affect ARHGAP10 GTPase activation activity towards RHOA and CDC42. Interacts via its SH3 domain with PTK2/FAK1. Interacts with PTK2B/PYK2; the interaction negatively regulates ARHGAP10 GTPase-activating activity. Association to cell membrane is dependent on PH domain. High levels of expression in brain, testes, liver, heart and kidney. Phosphorylated on tyrosine residues, probably involving PTK2B/PYK2.