The function of GNAT2 (G protein subunit alpha transducin 2, Ensembl gene identifier ENSG00000134183) is as follows. Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. Transducin is an amplifier and one of the transducers of a visual impulse that performs the coupling between rhodopsin and cGMP- phosphodiesterase.