4UG2

Thermostabilised HUMAN A2a Receptor with CGS21680 bound


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Molecular Determinants of Cgs21680 Binding to the Human Adenosine A2A Receptor.

Lebon, G.Edwards, P.C.Leslie, A.G.W.Tate, C.G.

(2015) Mol Pharmacol 87: 907

  • DOI: 10.1124/mol.114.097360
  • Primary Citation of Related Structures:  
    4UG2, 4UHR

  • PubMed Abstract: 
  • The adenosine A2A receptor (A(2A)R) plays a key role in transmembrane signaling mediated by the endogenous agonist adenosine. Here, we describe the crystal structure of human A2AR thermostabilized in an active-like conformation bound to the selective ...

    The adenosine A2A receptor (A(2A)R) plays a key role in transmembrane signaling mediated by the endogenous agonist adenosine. Here, we describe the crystal structure of human A2AR thermostabilized in an active-like conformation bound to the selective agonist 2-[p-(2-carboxyethyl)phenylethyl-amino]-5'-N-ethylcarboxamido adenosine (CGS21680) at a resolution of 2.6 Å. Comparison of A(2A)R structures bound to either CGS21680, 5'-N-ethylcarboxamido adenosine (NECA), UK432097 [6-(2,2-diphenylethylamino)-9-[(2R,3R,4S,5S)-5-(ethylcarbamoyl)-3,4-dihydroxy-tetrahydrofuran-2-yl]-N-[2-[[1-(2-pyridyl)-4-piperidyl]carbamoylamino]ethyl]purine-2-carboxamide], or adenosine shows that the adenosine moiety of the ligands binds to the receptor in an identical fashion. However, an extension in CGS21680 compared with adenosine, the (2-carboxyethyl)phenylethylamino group, binds in an extended vestibule formed from transmembrane regions 2 and 7 (TM2 and TM7) and extracellular loops 2 and 3 (EL2 and EL3). The (2-carboxyethyl)phenylethylamino group makes van der Waals contacts with side chains of amino acid residues Glu169(EL2), His264(EL3), Leu267(7.32), and Ile274(7.39), and the amine group forms a hydrogen bond with the side chain of Ser67(2.65). Of these residues, only Ile274(7.39) is absolutely conserved across the human adenosine receptor subfamily. The major difference between the structures of A(2A)R bound to either adenosine or CGS21680 is that the binding pocket narrows at the extracellular surface when CGS21680 is bound, due to an inward tilt of TM2 in that region. This conformation is stabilized by hydrogen bonds formed by the side chain of Ser67(2.65) to CGS21680, either directly or via an ordered water molecule. Mutation of amino acid residues Ser67(2.65), Glu169(EL2), and His264(EL3), and analysis of receptor activation either in the presence or absence of ligands implicates this region in modulating the level of basal activity of A(2A)R.


    Organizational Affiliation

    Institut de Génomique Fonctionelle, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5203, Institut National de la Sante et de la Recherche Medicale U1191, Université de Montpellier, Montpellier, France (G.L.); and Medical Research Council Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge, United Kingdom (P.C.E., A.G.W.L., C.G.T.) guillaume.lebon@igf.cnrs.fr cgt@mrc-lmb.cam.ac.uk.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
THERMOSTABILISED HUMAN A2A RECEPTORAB325Homo sapiensMutation(s): 5 
Gene Names: ADORA2AADORA2
Membrane protein
Mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
G Protein-Coupled Receptors (GPCRs): Class A
Protein: 
A2A adenosine receptor (engineered) with bound CGS21680 (P21)
Find proteins for P29274 (Homo sapiens)
Explore P29274 
Go to UniProtKB:  P29274
NIH Common Fund Data Resources
PHAROS  P29274
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NGI
Query on NGI

Download Ideal Coordinates CCD File 
A, B
2-[P-(2-CARBOXYETHYL)PHENYLETHYL-AMINO]-5'-N-ETHYLCARBOXAMIDO ADENOSINE
C23 H29 N7 O6
PAOANWZGLPPROA-RQXXJAGISA-N
 Ligand Interaction
OLB
Query on OLB

Download Ideal Coordinates CCD File 
A, B
(2S)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate
C21 H40 O4
RZRNAYUHWVFMIP-QJRAZLAKSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
NGIKi:  50   nM  BindingDB
NGIKi:  8.800000190734863   nM  BindingDB
NGIKd:  632   nM  BindingDB
NGIKd:  36   nM  BindingDB
NGIKi:  27   nM  BindingDB
NGIEC50:  18   nM  BindingDB
NGIKi:  70   nM  BindingDB
NGIEC50:  115   nM  BindingDB
NGIKd:  74   nM  BindingDB
NGIKi:  27.100000381469727   nM  BindingDB
NGIKd:  99   nM  BindingDB
NGIKi:  46.20000076293945   nM  BindingDB
NGIKd:  7.599999904632568   nM  BindingDB
NGIKd:  12   nM  BindingDB
NGIKd:  4.300000190734863   nM  BindingDB
NGIKi:  12   nM  BindingDB
NGIKi:  15   nM  BindingDB
NGIKd:  27   nM  BindingDB
NGIKi:  27   nM  BindingDB
NGIKi:  21.899999618530273   nM  BindingDB
NGIKi:  19   nM  BindingDB
NGIKd:  4.400000095367432   nM  BindingDB
NGIEC50:  19953   nM  BindingDB
NGIKi:  18   nM  BindingDB
NGIKi:  503   nM  BindingDB
NGIKi:  11   nM  BindingDB
NGIEC50:  2.0999999046325684   nM  BindingDB
NGIKi:  10   nM  BindingDB
NGIKi:  21   nM  BindingDB
NGIKd:  22   nM  BindingDB
NGIIC50:  19   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.253α = 90
b = 105.944β = 90
c = 125.861γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-04-08
    Type: Initial release
  • Version 1.1: 2015-05-13
    Changes: Database references
  • Version 1.2: 2019-04-03
    Changes: Data collection, Other, Source and taxonomy