Enables GTPase activator activity. Involved in G protein-coupled receptor signaling pathway and positive regulation of GTPase activity. Is intrinsic component of membrane. Is expressed in several structures, including central nervous system; limb mesenchyme; lip; neural retina; and skeletal musculature. Orthologous to human RGS16 (regulator of G protein signaling 16). [provided by Alliance of Genome Resources, Apr 2022]