5UIG

Crystal structure of adenosine A2A receptor bound to a novel triazole-carboximidamide antagonist


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.276 
  • R-Value Observed: 0.277 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the adenosine A2A receptor bound to an antagonist reveals a potential allosteric pocket.

Sun, B.Bachhawat, P.Chu, M.L.Wood, M.Ceska, T.Sands, Z.A.Mercier, J.Lebon, F.Kobilka, T.S.Kobilka, B.K.

(2017) Proc Natl Acad Sci U S A 114: 2066-2071

  • DOI: 10.1073/pnas.1621423114
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The adenosine A 2A receptor (A 2A R) has long been implicated in cardiovascular disorders. As more selective A 2A R ligands are being identified, its roles in other disorders, such as Parkinson's disease, are startin ...

    The adenosine A 2A receptor (A 2A R) has long been implicated in cardiovascular disorders. As more selective A 2A R ligands are being identified, its roles in other disorders, such as Parkinson's disease, are starting to emerge, and A 2A R antagonists are important drug candidates for nondopaminergic anti-Parkinson treatment. Here we report the crystal structure of A 2A receptor bound to compound 1 (Cmpd-1), a novel A 2A R/ N -methyl d-aspartate receptor subtype 2B (NR2B) dual antagonist and potential anti-Parkinson candidate compound, at 3.5 Å resolution. The A 2A receptor with a cytochrome b562-RIL (BRIL) fusion (A 2A R-BRIL) in the intracellular loop 3 (ICL3) was crystallized in detergent micelles using vapor-phase diffusion. Whereas A 2A R-BRIL bound to the antagonist ZM241385 has previously been crystallized in lipidic cubic phase (LCP), structural differences in the Cmpd-1-bound A 2A R-BRIL prevented formation of the lattice observed with the ZM241385-bound receptor. The crystals grew with a type II crystal lattice in contrast to the typical type I packing seen from membrane protein structures crystallized in LCP. Cmpd-1 binds in a position that overlaps with the native ligand adenosine, but its methoxyphenyl group extends to an exosite not previously observed in other A 2A R structures. Structural analysis revealed that Cmpd-1 binding results in the unique conformations of two tyrosine residues, Tyr9 1.35 and Tyr271 7.36 , which are critical for the formation of the exosite. The structure reveals insights into antagonist binding that are not observed in other A 2A R structures, highlighting flexibility in the binding pocket that may facilitate the development of A 2A R-selective compounds for the treatment of Parkinson's disease.


    Organizational Affiliation

    Department of Molecular and Cellular Physiology, Stanford University School of Medicine, Stanford, CA 94305.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Adenosine receptor A2a,Soluble cytochrome b562,Adenosine receptor A2a
A
444Homo sapiensEscherichia coliMutation(s): 3 
Gene Names: ADORA2AADORA2
Find proteins for P0ABE7 (Escherichia coli)
Go to UniProtKB:  P0ABE7
Find proteins for P29274 (Homo sapiens)
Go to UniProtKB:  P29274
NIH Common Fund Data Resources
PHAROS  P29274
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
8D1
Query on 8D1

Download CCD File 
A
5-amino-N-[(2-methoxyphenyl)methyl]-2-(3-methylphenyl)-2H-1,2,3-triazole-4-carboximidamide
C18 H20 N6 O
UJHUYWLZLDBDSR-UHFFFAOYSA-N
 Ligand Interaction
EDT
Query on EDT

Download CCD File 
A
{[-(BIS-CARBOXYMETHYL-AMINO)-ETHYL]-CARBOXYMETHYL-AMINO}-ACETIC ACID
C10 H16 N2 O8
KCXVZYZYPLLWCC-UHFFFAOYSA-N
 Ligand Interaction
MES
Query on MES

Download CCD File 
A
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.50 Å
  • R-Value Free: 0.299 
  • R-Value Work: 0.276 
  • R-Value Observed: 0.277 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 131.222α = 90
b = 131.222β = 90
c = 89.714γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2017-02-08
    Type: Initial release
  • Version 1.1: 2017-02-22
    Changes: Database references
  • Version 1.2: 2017-03-08
    Changes: Database references