G-protein coupled receptor which binds to the neurotransmitter dopamine with high affinity leading to the activation of an associated G-protein and downstream signaling pathways (PubMed:12887685). Couples to G-proteins to inhibit adenylate cyclase (AC) activity and cAMP production (PubMed:12887685). Inhibits synaptic vesicle fusion to negatively regulate the release of dopamine at dopaminergic neuron synapses (PubMed:31494966). Antagonizes octopamine signaling in response to food by promoting the dopamine-mediated suppression of crh-1/CREB1 transcription factor activation in cholinergic SIA neurons (PubMed:19609300). This is most likely in association with the G(o)-alpha G-protein subunit goa-1 (PubMed:19609300). In association with the G-alpha protein gpa-14, modulates two types of learning behavior: touch habituation and chemosensory associative conditioning (PubMed:23607404). May act partly via tsp-17 to negatively regulate dopamine reuptake transporter dat-1 activity (PubMed:25474638). Plays a role in behavioral plasticity and regulates the decision-making process when conflicting alternatives are present (PubMed:25536037). Promotes male mating behavior by antagonizing acetylcholine signaling to control the protrusions of copulatory spicules from the tail of males during hermaphrodite vulval location (PubMed:23166505, PubMed:26156999). Modulates unc-7 activity at gap junctions to promote inhibitory neuronal signaling transduction between chemosensory and mechanosensory neurons, and thus ensures spicule insertion attempts are confined to the hermaphrodite vulva during copulation (PubMed:26156999). G-protein coupled receptor which binds to the neurotransmitter dopamine with high affinity leading to the activation of an associated G-protein and downstream signaling pathways (PubMed:12887685). Couples to G-proteins to inhibit adenylate cyclase (AC) activity and cAMP production (PubMed:12887685). Interacts (via C-terminus) with the G-alpha protein gpa-14; the interaction is direct. Expressed in all dopaminergic neurons (PubMed:12887685). Expressed in neurons around the nerve ring and the posterior side of the body including PDE neurons (PubMed:12887685). In hermaphrodites, expressed in the head and tail ganglia including in the RIA interneuron pair, and in a subset of sublateral interneurons and the PDA neuron in the tail (PubMed:14568548). Expressed in cholinergic SIA neurons (PubMed:19609300). Also expressed in the male tail (PubMed:12887685, PubMed:23166505, PubMed:26156999). In males, expressed in the dorsal spicule protractor, ventral spicule protractor, dorsal spicule retractor and ventral spicule retractor muscles and the sensory post-cloacal sensilla B (PCB) neuron (PubMed:23166505). In males, expressed in the sensory hook neurons HOA (PubMed:26156999). Expressed in the head and tail ganglia of larval hermaphrodites. Modulates drug-mediated behavior, such as the response to nicotine and amphetamine (PubMed:20410438, PubMed:23351035). Plays a role in the sensitivity to the drug nicotine and promotes movement towards nicotine sources (PubMed:23351035). Plays a role in promoting amphetamine-induced loss of motility in water, termed swimming-induced paralysis (PubMed:20410438). Belongs to the G-protein coupled receptor 1 family.