Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction | Predict Membrane 

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 56.23 kDa 
• Atom Count: 3568 
• Modelled Residue Count: 444 
• Deposited Residue Count: 488 
• Unique protein chains: 1

3QAK

Agonist bound structure of the human adenosine A2a receptor

• PDB DOI: 10.2210/pdb3QAK/pdb

• Classification: SIGNALING PROTEIN, HYDROLASE
• Organism(s): Homo sapiens, Escherichia virus T4
• Expression System: Spodoptera frugiperda
• Mutation(s): Yes 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2011-01-11 Released: 2011-03-09 
• Deposition Author(s): Xu, F., Wu, H., Katritch, V., Han, G.W., Cherezov, V., Stevens, R., GPCR Network (GPCR)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.71 Å
• R-Value Free: 0.273 
• R-Value Work: 0.217 
• R-Value Observed: 0.220 

Literature

Structure of an agonist-bound human A2A adenosine receptor.

Xu, F., Wu, H., Katritch, V., Han, G.W., Jacobson, K.A., Gao, Z.G., Cherezov, V., Stevens, R.C.

(2011) Science 332: 322-327

• PubMed: 21393508 
• DOI: 10.1126/science.1202793
• Primary Citation of Related Structures:  
  3QAK


• PubMed Abstract: 
  

Activation of G protein-coupled receptors upon agonist binding is a critical step in the signaling cascade for this family of cell surface proteins. We report the crystal structure of the A(2A) adenosine receptor (A(2A)AR) bound to an agonist UK-432097 at 2.7 angstrom resolution. Relative to inactive, antagonist-bound A(2A)AR, the agonist-bound structure displays an outward tilt and rotation of the cytoplasmic half of helix VI, a movement of helix V, and an axial shift of helix III, resembling the changes associated with the active-state opsin structure. Additionally, a seesaw movement of helix VII and a shift of extracellular loop 3 are likely specific to A(2A)AR and its ligand. The results define the molecule UK-432097 as a "conformationally selective agonist" capable of receptor stabilization in a specific active-state configuration.

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Organizational Affiliation: 

Department of Molecular Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Adenosine receptor A2a,lysozyme chimera	A	488	Homo sapiens, Escherichia virus T4	Mutation(s): 2  Gene Names: ADORA2, ADORA2A, E EC: 3.2.1.17 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
Find proteins for P00720 (Enterobacteria phage T4) Explore P00720  Go to UniProtKB:  P00720
UniProt Groups	P29274P00720

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
UKA	B [auth A]	6-(2,2-diphenylethylamino)-9-[(2R,3R,4S,5S)-5-(ethylcarbamoyl)-3,4-dihydroxy-oxolan-2-yl]-N-[2-[(1-pyridin-2-ylpiperidin-4-yl)carbamoylamino]ethyl]purine-2-carboxamide C40 H47 N11 O6 ZOTHAEBAWXWVID-HXEFRTELSA-N
OLC	C [auth A], D [auth A]	(2R)-2,3-dihydroxypropyl (9Z)-octadec-9-enoate C21 H40 O4 RZRNAYUHWVFMIP-GDCKJWNLSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
UKA	BindingDB:  3QAK	Ki: 4 (nM) from 1 assay(s)
		IC50: 4 (nM) from 1 assay(s)
	PDBBind:  3QAK	Ki: 4.75 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.71 Å
• R-Value Free: 0.273 
• R-Value Work: 0.217 
• R-Value Observed: 0.220 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.836	α = 90
b = 78.944	β = 100.54
c = 86.579	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHASER	phasing
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-01-11 
• Released Date: 2011-03-09 
Deposition Author(s): Xu, F., Wu, H., Katritch, V., Han, G.W., Cherezov, V., Stevens, R., GPCR Network (GPCR)

Revision History  

• Version 1.0: 2011-03-09
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2012-05-02
  Changes: Structure summary
• Version 1.3: 2012-10-10
  Changes: Database references
• Version 1.4: 2017-07-26
  Changes: Refinement description, Source and taxonomy
• Version 1.5: 2018-01-24
  Changes: Structure summary