Learn and talk about Orexin receptor, G protein coupled receptors, Genes on chromosome 1, Genes on chromosome 6, Orexin antagonists

hypocretin (orexin) receptor 1
Identifiers
Symbol	HCRTR1
Entrez	3061
HUGO	4848
OMIM	602392
RefSeq	NM_001525
UniProt	O43613
Other data
Locus	Chr. 1 p33

hypocretin (orexin) receptor 2
Identifiers
Symbol	HCRTR2
Entrez	3062
HUGO	4849
OMIM	602393
RefSeq	NM_001526
UniProt	O43614
Other data
Locus	Chr. 6 p11-q11

Orexin receptor type 2

Identifiers

Symbol

Orexin_rec2

Available protein structures:
Pfam	structures
PDB	RCSB PDB; PDBe
PDBsum	structure summary

The orexin receptor (also referred to as the hypocretin receptor) is a G-protein-coupled receptor that binds the neuropeptide hormone orexin. There are two variants, OX₁ and OX₂, each encoded by a different gene (HCRTR1, HCRTR2).^[1]

Both orexin receptors exhibit a similar pharmacology - the 2 orexin peptides, orexin-A and orexin-B, bind to both receptors and, in each case, agonist binding results in an increase in intracellular calcium levels. However, orexin-B shows a 10-fold selectivity for orexin receptor type 2, whilst orexin-A is equipotent at both receptors.^[2]

Several orexin receptor antagonists are in development for potential use in sleep disorders.

References [edit]

^ Spinazzi R, Andreis PG, Rossi GP, Nussdorfer GG (2006). "Orexins in the regulation of the hypothalamic-pituitary-adrenal axis". Pharmacol. Rev. 58 (1): 46–57. doi:10.1124/pr.58.1.4. PMID 16507882.
^ Smart D, Jerman JC, Brough SJ, Rushton SL, Murdock PR, Jewitt F, Elshourbagy NA, Ellis CE, Middlemiss DN, Brown F (September 1999). "Characterization of recombinant human orexin receptor pharmacology in a Chinese hamster ovary cell-line using FLIPR". Br. J. Pharmacol. 128 (1): 1–3. doi:10.1038/sj.bjp.0702780. PMC 1571615. PMID 10498827.

External links [edit]

"Orexin Receptors". IUPHAR Database of Receptors and Ion Channels. International Union of Basic and Clinical Pharmacology.
Orexin Receptors at the US National Library of Medicine Medical Subject Headings (MeSH)

This transmembrane receptor-related article is a stub. You can help Wikipedia by expanding it.

Cell surface receptor: G protein-coupled receptors

Class A:
Rhodopsin like

Neurotransmitter

Adrenergic	α1 (A B D) α2 (A B C) β1 β2 β3

Purinergic	Adenosine (A1 A2A A2B A3) P2Y (1 2 4 5 6 8 9 10 11 12 13 14)

Serotonin	(all but 5-HT3) 5-HT1 (A B D E F) 5-HT2 (A B C) 5-HT (4 5A 6 7)

Other	Acetylcholine (M1 M2 M3 M4 M5) Dopamine (D1 D2 D3 D4 D5) Histamine (H1 H2 H3 H4) Melatonin (1A 1B 1C) TAAR (1 2 3 5 6 8 9)

Metabolites and
signaling molecules

Eicosanoid	CysLT (1 2) LTB4 (1 2) FPRL1 OXE Prostaglandin (DP (1 2), EP (1 2 3 4), FP) Prostacyclin Thromboxane

Other	Bile acid Cannabinoid (CB1 CB2, GPR (18 55 119)) EBI2 Estrogen Free fatty acid (1 2 3 4) Lactate Lysophosphatidic acid (1 2 3 4 5 6) Lysophospholipid (1 2 3 4 5 6 7 8) Niacin (1 2) Oxoglutarate PAF Sphingosine-1-phosphate (1 2 3 4 5) Succinate

Peptide

Neuropeptide	B/W (1 2) FF (1 2) S Y (1 2 4 5) Neuromedin (B U (1 2)) Neurotensin (1 2)

Other	Anaphylatoxin (C3a C5a) Angiotensin (1 2) Apelin Bombesin (BRS3 GRPR NMBR) Bradykinin (B1 B2) Chemokine Cholecystokinin (A B) Endothelin (A B) Formyl peptide (1 2 3) FSH Galanin (1 2 3) GHB receptor Gonadotropin-releasing hormone (1 2) Ghrelin Kisspeptin Luteinizing hormone/choriogonadotropin MAS (1 1L D E F G X1 X2 X3 X4) Melanocortin (1 2 3 4 5) MCHR (1 2) Motilin Opioid (Delta Kappa Mu Nociceptin & Zeta, but not Sigma) Orexin (1 2) Oxytocin Prokineticin (1 2) Prolactin-releasing peptide Relaxin (1 2 3 4) Somatostatin (1 2 3 4 5) Tachykinin (1 2 3) Thyrotropin Thyrotropin-releasing hormone Urotensin-II Vasopressin (1A 1B 2)

Miscellaneous

Orphan	GPR (1 3 4 6 12 15 17 18 19 20 21 22 23 25 26 27 31 32 33 34 35 37 39 42 44 45 50 52 55 61 62 63 65 68 75 77 78 81 82 83 84 85 87 88 92 101 103 109A 109B 119 120 132 135 137B 139 141 142 146 148 149 150 151 152 153 160 161 162 171 173 174 176 177 182 183)

Other	Adrenomedullin Olfactory Opsin (3 4 5 1LW 1MW 1SW RGR RRH) Protease-activated (1 2 3 4) SREB (1 2 3)

Class B: Secretin like

Orphan	GPR (56 64 97 98 110 111 112 113 114 115 116 123 124 125 126 128 133 143 144 155 157)

Other	Brain-specific angiogenesis inhibitor (1 2 3) Cadherin (1 2 3) Calcitonin CALCRL CD97 Corticotropin-releasing hormone (1 2) EMR (1 2 3) Glucagon (GR GIPR GLP1R GLP2R) Growth hormone releasing hormone PACAPR1 GPR Latrophilin (1 2 3 ELTD1) Methuselah-like proteins Parathyroid hormone (1 2) Secretin Vasoactive intestinal peptide (1 2)

Class C: Metabotropic
glutamate / pheromone

Taste	TAS1R (1 2 3) TAS2R (1 3 4 5 7 8 9 10 13 14 16 19 20 30 31 38 39 40 41 42 43 45 46 50 60)

Other	Calcium-sensing receptor GABA B (1 2) Glutamate receptor (Metabotropic glutamate (1 2 3 4 5 6 7 8)) GPRC6A GPR (156 158 179) RAIG (1 2 3 4)

Class F:
Frizzled / Smoothened

Frizzled	Frizzled (1 2 3 4 5 6 7 8 9 10)

Smoothened	Smoothened

B trdu: iter (nrpl/grfl/cytl/horl), csrc (lgic, enzr, gprc, igsr, intg, nrpr/grfr/cytr), itra (adap, gbpr, mapk), calc, lipd; path (hedp, wntp, tgfp+mapp, notp, jakp, fsap, hipp, tlrp)

Neuropeptidergics

Cholecystokinin

CCK_A	Agonists: Cholecystokinin CCK-4 Antagonists: Asperlicin Proglumide Lorglumide Devazepide Dexloxiglumide

CCK_B	Agonists: Cholecystokinin CCK-4 Gastrin Antagonists: Proglumide CI-988

CRH

CRF₁	Agonists: Corticotropin releasing hormone Antagonists: Antalarmin CP-154,526 Pexacerfont

CRF₂	Agonists: Corticotropin releasing hormone

Galanin

GAL₁	Agonists: Galanin Galanin-like peptide Galmic Galnon

GAL₂	Agonists: Galanin Galanin-like peptide Galmic Galnon

GAL₃	Agonists: Galanin Galmic Galnon

Ghrelin

GnRH

MCH

MCH₁	Agonists: Melanin concentrating hormone Antagonists: ATC-0175 GW-803,430 NGD-4715 SNAP-7941 SNAP-94847

MCH₂	Agonists: Melanin concentrating hormone

Melanocortin

MC₁	Agonists: alpha-MSH Afamelanotide BMS-470,539 Bremelanotide Melanotan II Antagonists: Agouti signalling peptide

MC₂	Agonists: ACTH Cosyntropin Tetracosactide

MC₃	Agonists: alpha-MSH Bremelanotide Melanotan II

MC₄	Agonists: alpha-MSH Bremelanotide Melanotan II PF-00446687 THIQ Antagonists: Agouti-related peptide

MC₅	Agonists: alpha-MSH Melanotan II

Neuropeptide S

Agonists: Neuropeptide S
Antagonists: SHA-68

Neuropeptide Y

Y₁	Agonists: Neuropeptide Y Peptide YY Antagonists: BIBP-3226

Y₂	Agonists: Neuropeptide Y Peptide YY Antagonists: BIIE-0246

Y₄	Agonists: Neuropeptide Y Pancreatic polypeptide Peptide YY Antagonists: UR-AK49

Y₅	Agonists: Neuropeptide Y Peptide YY Antagonists: Lu AA-33810

Neurotensin

NTS₁	Agonists: Neurotensin Neuromedin N Antagonists: SR-48692 SR-142,948

NTS₂	Agonists: Neurotensin Antagonists: Levocabastine SR-142,948

Orexin

OX₁	Agonists: Orexin-A Antagonists: Almorexant SB-334,867 SB-408,124 SB-649,868 Suvorexant

OX₂	Agonists: Orexin-A Antagonists: Almorexant SB-649,868 Suvorexant TCS-OX2-29

Oxytocin

Tachykinin

NK₁	Agonists: Substance P Antagonists: Aprepitant Befetupitant Casopitant CI-1021 CP-96,345 CP-99,994 CP-122,721 Dapitant Ezlopitant FK-888 Fosaprepitant GR-203,040 GW-597,599 HSP-117 L-733,060 L-741,671 L-743,310 L-758,298 Lanepitant LY-306,740 Maropitant Netupitant NKP-608 Nolpitantium Orvepitant RP-67,580 SDZ NKT 343 Vestipitant Vofopitant

NK₂	Agonists: Neurokinin A Antagonists: GR-159,897 Ibodutant Saredutant

NK₃	Agonists: Neurokinin B Antagonists: Osanetant Talnetant

Vasopressin

V_1A	Agonists: Desmopressin Felypressin Ornipressin Terlipressin Vasopressin Antagonists: Conivaptan Demeclocycline Relcovaptan

V_1B	Agonists: Felypressin Ornipressin Terlipressin Vasopressin Antagonists: Demeclocycline Nelivaptan

V₂	Agonists: Desmopressin Ornipressin Vasopressin Antagonists: Conivaptan Demeclocycline Lixivaptan Mozavaptan Satavaptan Tolvaptan

This article incorporates text from the public domain Pfam and InterPro IPR004060

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Orexin receptor

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