Has a role in regulating actin cytoskeletal organization: required during early development for proper execution of morphogenetic movements of individual cells and groups of cells important for the formation of the embryonic body plan (PubMed:10556060, PubMed:24535826, PubMed:25739458). Plays a role in regulating dorsal closure during embryogenesis (PubMed:10556060, PubMed:10323867). During axis elongation, required for Rho-kinase Rok planar polarity and adherens junction localization as well as for generating a planar polarized distribution of the actin-binding protein Shrm (PubMed:24535826). During embryogenesis, acts upstream of wash to regulate the developmental migration of tail hemocytes anteriorly along the ventral midline (PubMed:25739458). May have a role in eye development (PubMed:7835340). Interacts with capu (PubMed:10556060). Interacts (via REM repeats) with Pkn (via N-terminus) (PubMed:10323867, PubMed:17507675). Interacts (via N-terminus) with wash (via N-terminus) (PubMed:25739458). Expressed in hemocytes (at protein level). Embryonic lethal. Embryos exhibit severe defects in head involution and imperfect dorsal closure. During head involution, the head structures fail to internalize resulting in holes in the dorsal anterior region of the cuticle. The disruption in the dorsal surface stretches the ventral surface, causing the cuticle to bow. Belongs to the small GTPase superfamily. Rho family.