Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 63.70 kDa 
• Atom Count: 4076 
• Residue Count: 503 
• Unique protein chains: 1

4ZJC

Structures of the human OX1 orexin receptor bound to selective and dual antagonists

• DOI: 10.2210/pdb4ZJC/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Homo sapiens, Pyrococcus abyssi GE5
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 


• Deposited: 2015-04-29 Released: 2016-03-09 
• Deposition Author(s): Yin, J., Brautigam, C.A., Shao, Z., Clark, L., Harrell, C.M., Gotter, A.L., Coleman, P.J., Renger, J.J., Rosenbaum, D.M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.83 Å
• R-Value Free: 0.262 
• R-Value Work: 0.216 
• R-Value Observed: 0.219 

Literature

Structure and ligand-binding mechanism of the human OX1 and OX2 orexin receptors.

Yin, J., Babaoglu, K., Brautigam, C.A., Clark, L., Shao, Z., Scheuermann, T.H., Harrell, C.M., Gotter, A.L., Roecker, A.J., Winrow, C.J., Renger, J.J., Coleman, P.J., Rosenbaum, D.M.

(2016) Nat Struct Mol Biol 23: 293-299

• PubMed: 26950369 
• DOI: 10.1038/nsmb.3183
• Primary Citation of Related Structures:  
  4ZJC, 4ZJ8


• PubMed Abstract: 
  

The orexin (also known as hypocretin) G protein-coupled receptors (GPCRs) regulate sleep and other behavioral functions in mammals, and are therapeutic targets for sleep and wake disorders. The human receptors hOX1R and hOX2R, which are 64% identical in sequence, have overlapping but distinct physiological functions and potential therapeutic profiles. We determined structures of hOX1R bound to the OX1R-selective antagonist SB-674042 and the dual antagonist suvorexant at 2.8-Å and 2.75-Å resolution, respectively, and used molecular modeling to illuminate mechanisms of antagonist subtype selectivity between hOX1R and hOX2R. The hOX1R structures also reveal a conserved amphipathic α-helix, in the extracellular N-terminal region, that interacts with orexin-A and is essential for high-potency neuropeptide activation at both receptors. The orexin-receptor crystal structures are valuable tools for the design and development of selective orexin-receptor antagonists and agonists.

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Organizational Affiliation: 

Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, Texas, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
human OX1R fusion protein to P.abysii glycogen synthase	A	553	Homo sapiens, Pyrococcus abyssi GE5	Mutation(s): 1  Gene Names: HCRTR1
Membrane protein Mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  G Protein-Coupled Receptors (GPCRs): Class A	Protein:  OX1 orexin receptor with bound suvorexant
Find proteins for Q9V2J8 (Pyrococcus abyssi (strain GE5 / Orsay)) Explore Q9V2J8  Go to UniProtKB:  Q9V2J8
Find proteins for O43613 (Homo sapiens) Explore O43613  Go to UniProtKB:  O43613
NIH Common Fund Data Resources
PHAROS  O43613 GTEx  ENSG00000121764

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
4OT	A	[5-(2-fluorophenyl)-2-methyl-1,3-thiazol-4-yl]{(2S)-2-[(5-phenyl-1,3,4-oxadiazol-2-yl)methyl]pyrrolidin-1-yl}methanone C24 H21 F N4 O2 S HYBZWVLPALMACV-KRWDZBQOSA-N
OLA	A	OLEIC ACID C18 H34 O2 ZQPPMHVWECSIRJ-KTKRTIGZSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
4OT	Ki:  1.100000023841858   nM  BindingDB
4OT	Kd:  5.099999904632568   nM  BindingDB

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.83 Å
• R-Value Free: 0.262 
• R-Value Work: 0.216 
• R-Value Observed: 0.219 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.431	α = 90
b = 66.466	β = 90
c = 182.129	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
Blu-Ice	data collection
HKL-3000	data scaling
PHASER	phasing
HKL-3000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2015-04-29 
• Released Date: 2016-03-09 
Deposition Author(s): Yin, J., Brautigam, C.A., Shao, Z., Clark, L., Harrell, C.M., Gotter, A.L., Coleman, P.J., Renger, J.J., Rosenbaum, D.M.

Revision History 

• Version 1.0: 2016-03-09
  Type: Initial release
  
• Version 1.1: 2016-03-23
  Changes: Database references
• Version 1.2: 2016-04-13
  Changes: Database references