||G-protein coupled opioid receptor that functions as receptor for the endogenous neuropeptide nociceptin. Ligand binding causes a conformation change that triggers signaling via guanine nucleotide-binding proteins (G proteins) and modulates the activity of down-stream effectors. Signaling via G proteins mediates inhibition of adenylate cyclase activity and calcium channel activity. Arrestins modulate signaling via G proteins and mediate the activation of alternative signaling pathways that lead to the activation of MAP kinases. Plays a role in modulating nociception and the perception of pain. Plays a role in the regulation of locomotor activity by the neuropeptide nociceptin.
||Cell membrane, Multi-pass membrane protein, Cytoplasmic vesicle
||G-protein coupled receptor 1 family
||In the brain, isoform KOR3 and isoform KOR3C are most abundant in hypothalamus and periaqueductal gray. Isoform KOR3A is highly expressed in cortex, striatum and brainstem. Isoform KOR3D is highly expressed in cerebellum, hypothalamus and brainstem. Detec