6TPG

Crystal structure of the Orexin-2 receptor in complex with EMPA at 2.74 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Comparison of Orexin 1 and Orexin 2 Ligand Binding Modes Using X-ray Crystallography and Computational Analysis.

Rappas, M.Ali, A.A.E.Bennett, K.A.Brown, J.D.Bucknell, S.J.Congreve, M.Cooke, R.M.Cseke, G.de Graaf, C.Dore, A.S.Errey, J.C.Jazayeri, A.Marshall, F.H.Mason, J.S.Mould, R.Patel, J.C.Tehan, B.G.Weir, M.Christopher, J.A.

(2020) J Med Chem 63: 1528-1543

  • DOI: https://doi.org/10.1021/acs.jmedchem.9b01787
  • Primary Citation of Related Structures:  
    6TO7, 6TOD, 6TOS, 6TOT, 6TP3, 6TP4, 6TP6, 6TPG, 6TPJ, 6TPN, 6TQ4, 6TQ6, 6TQ7, 6TQ9

  • PubMed Abstract: 

    The orexin system, which consists of the two G protein-coupled receptors OX 1 and OX 2 , activated by the neuropeptides OX-A and OX-B, is firmly established as a key regulator of behavioral arousal, sleep, and wakefulness and has been an area of intense research effort over the past two decades. X-ray structures of the receptors in complex with 10 new antagonist ligands from diverse chemotypes are presented, which complement the existing structural information for the system and highlight the critical importance of lipophilic hotspots and water molecules for these peptidergic GPCR targets. Learnings from the structural information regarding the utility of pharmacophore models and how selectivity between OX 1 and OX 2 can be achieved are discussed.


  • Organizational Affiliation

    Sosei Heptares , Steinmetz Building, Granta Park , Cambridge CB21 6DG , U.K.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Orexin receptor type 2,GlgA glycogen synthase,Hypocretin receptor-2564Homo sapiensPyrococcus abyssi GE5Mutation(s): 20 
Gene Names: HCRTR2PAB2292
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for Q9V2J8 (Pyrococcus abyssi (strain GE5 / Orsay))
Explore Q9V2J8 
Go to UniProtKB:  Q9V2J8
Find proteins for O43614 (Homo sapiens)
Explore O43614 
Go to UniProtKB:  O43614
PHAROS:  O43614
GTEx:  ENSG00000137252 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ9V2J8O43614
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
7MA (Subject of Investigation/LOI)
Query on 7MA

Download Ideal Coordinates CCD File 
B [auth A]N-ethyl-2-[(6-methoxypyridin-3-yl)-(2-methylphenyl)sulfonyl-amino]-N-(pyridin-3-ylmethyl)ethanamide
C23 H26 N4 O4 S
KJPHTXTWFHVJIG-UHFFFAOYSA-N
OLA
Query on OLA

Download Ideal Coordinates CCD File 
D [auth A]OLEIC ACID
C18 H34 O2
ZQPPMHVWECSIRJ-KTKRTIGZSA-N
PG4
Query on PG4

Download Ideal Coordinates CCD File 
C [auth A]TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
YCM
Query on YCM
A
L-PEPTIDE LINKINGC5 H10 N2 O3 SCYS
Binding Affinity Annotations 
IDSourceBinding Affinity
7MA BindingDB:  6TPG Ki: min: 1.1, max: 1000 (nM) from 2 assay(s)
IC50: 2 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.74 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.220 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 91.097α = 90
b = 172.914β = 90
c = 77.81γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling
PHASERphasing
PHENIXrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute on Drug Abuse (NIH/NIDA)United StatesR01DA039553

Revision History  (Full details and data files)

  • Version 1.0: 2020-01-01
    Type: Initial release
  • Version 1.1: 2020-01-29
    Changes: Database references
  • Version 1.2: 2020-03-11
    Changes: Database references
  • Version 1.3: 2024-01-24
    Changes: Data collection, Database references, Refinement description