Crystal structure of stabilized A1 receptor in complex with PSB36 at 3.3A resolution

Experimental Data Snapshot

  • Resolution: 3.30 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.257 

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Structures of Human A1 and A2A Adenosine Receptors with Xanthines Reveal Determinants of Selectivity.

Cheng, R.K.Y.Segala, E.Robertson, N.Deflorian, F.Dore, A.S.Errey, J.C.Fiez-Vandal, C.Marshall, F.H.Cooke, R.M.

(2017) Structure 25: 1275-1285.e4

  • DOI: https://doi.org/10.1016/j.str.2017.06.012
  • Primary Citation of Related Structures:  
    5MZJ, 5MZP, 5N2R, 5N2S

  • PubMed Abstract: 

    The adenosine A 1 and A 2A receptors belong to the purinergic family of G protein-coupled receptors, and regulate diverse functions of the cardiovascular, respiratory, renal, inflammation, and CNS. Xanthines such as caffeine and theophylline are weak, non-selective antagonists of adenosine receptors. Here we report the structure of a thermostabilized human A 1 receptor at 3.3 Å resolution with PSB36, an A 1 -selective xanthine-based antagonist. This is compared with structures of the A 2A receptor with PSB36 (2.8 Å resolution), caffeine (2.1 Å), and theophylline (2.0 Å) to highlight features of ligand recognition which are common across xanthines. The structures of A 1 R and A 2A R were analyzed to identify the differences that are important selectivity determinants for xanthine ligands, and the role of T270 7.35 in A 1 R (M270 7.35 in A 2A R) in conferring selectivity was confirmed by mutagenesis. The structural differences confirmed to lead to selectivity can be utilized in the design of new subtype-selective A 1 R or A 2A R antagonists.

  • Organizational Affiliation

    Heptares Therapeutics Ltd, Biopark, Broadwater Road, Welwyn Garden City AL7 3AX, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Soluble cytochrome b562,Adenosine receptor A1436Escherichia coliHomo sapiens
This entity is chimeric
Mutation(s): 11 
Gene Names: cybCADORA1
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 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP30542P0ABE7
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 8K8

Download Ideal Coordinates CCD File 
B [auth A]1-butyl-3-(3-oxidanylpropyl)-8-[(1~{R},5~{S})-3-tricyclo[^{3,7}]nonanyl]-7~{H}-purine-2,6-dione
C21 H30 N4 O3
Query on SO4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 3.30 Å
  • R-Value Free: 0.278 
  • R-Value Work: 0.256 
  • R-Value Observed: 0.257 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 70.273α = 90
b = 111.658β = 90
c = 160.543γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-08-09
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Refinement description