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Activity of the GTP-binding proteins is regulated by GAPs, that accelerate binding, and GTPases, that enhance the rate of GTP hydrolysis (Ras, Rho, cdc42Hs, and Rac). The isoforms of Rho, a small GTP-binding protein, regulate cellular processes such as the formation of the stress fibers, lamelipodia, and filopodia. ROKα (RhoA-binding kinase) is a Ser/Thr protein kinase that interects with the GTP-binding form of RhoA. Like RhoA, ROKα localizes at the cellular margins and colocalizes with acti filaments. The ROKα gene encodes a protein of 1302 amino acids with homology to the human myotonic kinase. Although ROKα binds to GTP-RhoA, it is not yet clear whether this interaction induces the kinase activity of ROKα.Immunofluorescence, Immunohistochemistry, Immunoprecipitation, Western Blotting
