Biological Assembly 1  

 3D View: Structure | Electron Density | Validation Report | Ligand Interaction | Predict Membrane 

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 96.14 kDa 
• Atom Count: 6250 
• Modelled Residue Count: 767 
• Deposited Residue Count: 832 
• Unique protein chains: 1

5UEN

Crystal structure of the human adenosine A1 receptor A1AR-bRIL in complex with the covalent antagonist DU172 at 3.2A resolution

• DOI: 10.2210/pdb5UEN/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Homo sapiens, Escherichia coli
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2017-01-03 Released: 2017-03-01 
• Deposition Author(s): Glukhova, A., Thal, D.M., Nguyen, A.T., Vecchio, E.A., Jorg, M., Scammells, P.J., May, L.T., Sexton, P.M., Christopoulos, A.
• Funding Organization(s): National Health and Medical Research Council (NHMRC, Australia)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.316 
• R-Value Work: 0.286 
• R-Value Observed: 0.288 

Literature

Structure of the Adenosine A1 Receptor Reveals the Basis for Subtype Selectivity.

Glukhova, A., Thal, D.M., Nguyen, A.T., Vecchio, E.A., Jorg, M., Scammells, P.J., May, L.T., Sexton, P.M., Christopoulos, A.

(2017) Cell 168: 867-877.e13

• PubMed: 28235198 
• DOI: 10.1016/j.cell.2017.01.042
• Primary Citation of Related Structures:  
  5UEN


• PubMed Abstract: 
  

The adenosine A ₁ receptor (A ₁ -AR) is a G-protein-coupled receptor that plays a vital role in cardiac, renal, and neuronal processes but remains poorly targeted by current drugs. We determined a 3.2 Å crystal structure of the A ₁ -AR bound to the selective covalent antagonist, DU172, and identified striking differences to the previously solved adenosine A _2A receptor (A _2A -AR) structure. Mutational and computational analysis of A ₁ -AR revealed a distinct conformation of the second extracellular loop and a wider extracellular cavity with a secondary binding pocket that can accommodate orthosteric and allosteric ligands. We propose that conformational differences in these regions, rather than amino-acid divergence, underlie drug selectivity between these adenosine receptor subtypes. Our findings provide a molecular basis for AR subtype selectivity with implications for understanding the mechanisms governing allosteric modulation of these receptors, allowing the design of more selective agents for the treatment of ischemia-reperfusion injury, renal pathologies, and neuropathic pain.

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Organizational Affiliation: 

Drug Discovery Biology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, Victoria 3052, Australia. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Adenosine receptor A1,Soluble cytochrome b562,Adenosine receptor A1	A, B	416	Homo sapiens, Escherichia coli	Mutation(s): 1  Gene Names: ADORA1, cybC Membrane Entity: Yes
UniProt & NIH Common Fund Data Resources
Find proteins for P0ABE7 (Escherichia coli) Explore P0ABE7  Go to UniProtKB:  P0ABE7
Find proteins for P30542 (Homo sapiens) Explore P30542  Go to UniProtKB:  P30542
PHAROS:  P30542 GTEx:  ENSG00000163485

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
DU1 (Subject of Investigation/LOI)	C [auth A], H [auth B]	4-{[3-(8-cyclohexyl-2,6-dioxo-1-propyl-1,2,6,7-tetrahydro-3H-purin-3-yl)propyl]carbamoyl}benzene-1-sulfonyl fluoride C24 H30 F N5 O5 S KAJVJPLKXGLLDA-UHFFFAOYSA-N
OLA (Subject of Investigation/LOI)	D [auth A], E [auth A], F [auth A], G [auth A], I [auth B], J [auth B], K [auth B]	OLEIC ACID C18 H34 O2 ZQPPMHVWECSIRJ-KTKRTIGZSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
DU1	BindingDB:  5UEN	Kd: min: 0.27, max: 0.37 (nM) from 4 assay(s)
		IC50: 24.9 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.20 Å
• R-Value Free: 0.316 
• R-Value Work: 0.286 
• R-Value Observed: 0.288 
• Space Group: P 2 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 96.492	α = 90
b = 112.96	β = 90
c = 124.171	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
Aimless	data scaling
PHASER	phasing
Coot	model building
PDB_EXTRACT	data extraction

Structure Validation

Ligand Structure Quality Assessment  

Entry History & Funding Information

Deposition Data

• Deposited Date: 2017-01-03 
• Released Date: 2017-03-01 
Deposition Author(s): Glukhova, A., Thal, D.M., Nguyen, A.T., Vecchio, E.A., Jorg, M., Scammells, P.J., May, L.T., Sexton, P.M., Christopoulos, A.

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Funding Organization	Location	Grant Number
National Health and Medical Research Council (NHMRC, Australia)	Australia	APP10552134
National Health and Medical Research Council (NHMRC, Australia)	Australia	APP1084246

Revision History  

• Version 1.0: 2017-03-01
  Type: Initial release
  
• Version 1.1: 2017-03-15
  Changes: Database references
• Version 1.2: 2017-09-27
  Changes: Author supporting evidence, Data collection
• Version 1.3: 2020-01-08
  Changes: Author supporting evidence