Thermostabilised HUMAN A2a Receptor with NECA bound

Experimental Data Snapshot

  • Resolution: 2.60 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.234 

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Agonist-Bound Adenosine A(2A) Receptor Structures Reveal Common Features of Gpcr Activation.

Lebon, G.Warne, T.Edwards, P.C.Bennett, K.Langmead, C.J.Leslie, A.G.W.Tate, C.G.

(2011) Nature 474: 521

  • DOI: https://doi.org/10.1038/nature10136
  • Primary Citation of Related Structures:  
    2YDO, 2YDV

  • PubMed Abstract: 

    Adenosine receptors and β-adrenoceptors are G-protein-coupled receptors (GPCRs) that activate intracellular G proteins on binding the agonists adenosine or noradrenaline, respectively. GPCRs have similar structures consisting of seven transmembrane helices that contain well-conserved sequence motifs, indicating that they are probably activated by a common mechanism. Recent structures of β-adrenoceptors highlight residues in transmembrane region 5 that initially bind specifically to agonists rather than to antagonists, indicating that these residues have an important role in agonist-induced activation of receptors. Here we present two crystal structures of the thermostabilized human adenosine A(2A) receptor (A(2A)R-GL31) bound to its endogenous agonist adenosine and the synthetic agonist NECA. The structures represent an intermediate conformation between the inactive and active states, because they share all the features of GPCRs that are thought to be in a fully activated state, except that the cytoplasmic end of transmembrane helix 6 partially occludes the G-protein-binding site. The adenine substituent of the agonists binds in a similar fashion to the chemically related region of the inverse agonist ZM241385 (ref. 8). Both agonists contain a ribose group, not found in ZM241385, which extends deep into the ligand-binding pocket where it makes polar interactions with conserved residues in H7 (Ser 277(7.42) and His 278(7.43); superscripts refer to Ballesteros-Weinstein numbering) and non-polar interactions with residues in H3. In contrast, the inverse agonist ZM241385 does not interact with any of these residues and comparison with the agonist-bound structures indicates that ZM241385 sterically prevents the conformational change in H5 and therefore it acts as an inverse agonist. Comparison of the agonist-bound structures of A(2A)R with the agonist-bound structures of β-adrenoceptors indicates that the contraction of the ligand-binding pocket caused by the inward motion of helices 3, 5 and 7 may be a common feature in the activation of all GPCRs.

  • Organizational Affiliation

    MRC Laboratory of Molecular Biology, Hills Road, Cambridge CB2 0QH, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ADENOSINE RECEPTOR A2A325Homo sapiensMutation(s): 5 
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for P29274 (Homo sapiens)
Explore P29274 
Go to UniProtKB:  P29274
PHAROS:  P29274
GTEx:  ENSG00000128271 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP29274
Sequence Annotations
  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
NEC BindingDB:  2YDV Ki: min: 1, max: 1.00e+4 (nM) from 39 assay(s)
IC50: min: 3.7, max: 366 (nM) from 8 assay(s)
EC50: min: 2.5, max: 394 (nM) from 15 assay(s)
PDBBind:  2YDV Ki: 13.8 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.60 Å
  • R-Value Free: 0.258 
  • R-Value Work: 0.233 
  • R-Value Observed: 0.234 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 76.936α = 90
b = 99.551β = 93.31
c = 79.655γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata 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: 2011-05-18
    Type: Initial release
  • Version 1.1: 2011-06-16
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-04-03
    Changes: Data collection, Other, Source and taxonomy
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Derived calculations, Other, Structure summary
  • Version 1.5: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary