Promotes endothelial cell sprouting and actin cytoskeletal reorganization (By similarity). May be involved in angiogenesis. May function in Ca(2+) signaling. In vitro, interacts with calmodulin in a calcium-dependent manner (By similarity). Interacts 14-3-3 family members including YWHAE, YWHAH, YWHAQ, YWHAZ in a phosphorylation-dependent manner. High expression in cardiac muscle. Moderate expression in lung, skeletal muscle and kidney. Low levels in spleen and brain. Repressed by lipopolysaccharide stimulation. Belongs to the small GTPase superfamily. RGK family.