Predicted to enable G protein-coupled receptor binding activity; G-protein beta/gamma-subunit complex binding activity; and GTPase activity. Predicted to be involved in adenylate cyclase-modulating G protein-coupled receptor signaling pathway and detection of chemical stimulus involved in sensory perception of bitter taste. Predicted to act upstream of or within signal transduction. Predicted to be part of heterotrimeric G-protein complex. Predicted to be active in cytoplasm; photoreceptor inner segment; and photoreceptor outer segment. Human ortholog(s) of this gene implicated in achromatopsia 4 and color blindness. Orthologous to human GNAT2 (G protein subunit alpha transducin 2).