Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. In association with the G-protein coupled dopamine receptor dop-2, modulates two types of learning: touch habituation and chemosensory associative conditioning (PubMed:23607404). G proteins are composed of 3 units; alpha, beta and gamma. The alpha chain contains the guanine nucleotide binding site. Interacts with the dopamine receptor dop-2 (via C-terminus); the interaction is direct (PubMed:22280843). Belongs to the G-alpha family.