Enables G-protein alpha-subunit binding activity and GTPase activator activity. Involved in several processes, including G protein-coupled acetylcholine receptor signaling pathway; positive regulation of GTPase activity; and response to amphetamine. Located in dendrite; neuronal cell body membrane; and nucleus. Is extrinsic component of cytoplasmic side of plasma membrane. Orthologous to human RGS8 (regulator of G protein signaling 8). [provided by Alliance of Genome Resources, Apr 2022]