May be specifically involved in neuronal and hepatic functions. Is a C3 toxin-insensitive member of the Rho subfamily (By similarity). Interacts with the Rho-GAP domain of RACGAP1 (PubMed:12590651). Interacts with UBXD5 (PubMed:11940653). Interacts with PRAG1 (By similarity). Colocalizes with RACGAP1 in Golgi-derived proacrosomal vesicles and the acrosome. Highly expressed in testis. Belongs to the small GTPase superfamily. Rho family.