The G-protein-coupled receptor (GPCR) superfamily is comprised of an estimated 600-1,000 members and is the largest known class of molecular targets with proven therapeutic value. The nociceptin receptor is a 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.
K3 opiate receptor; Kappa-Type 3 Opioid Receptor; Kappa3-Related Opioid Receptor; KOR-3; LC132 Receptor-Like; N/OFQ receptor; Nociceptin Receptor; nociceptin receptor ORL1; nociceptin/ orphaninFQ receptor; nociceptin/orphanin FQ receptor; NOCIR; NOP; NOPR; OOR; Opiate Receptor-Like 1; opioid receptor-like 1; opioid receptor-like protein Zf-orl; opioid-receptor-like protein; OPPRL1; ORGC; ORL1; Orphanin FQ Receptor; orphanin FQ receptor-a; orphanin FQ receptor-b; orphanin FQ receptor-e; peptide receptor; ROR-C; seven transmembrane G protein-coupled receptor; XOR; XOR1