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: 57.17 kDa 
• Atom Count: 3757 
• Modelled Residue Count: 448 
• Deposited Residue Count: 488 
• Unique protein chains: 1

3EML

The 2.6 A Crystal Structure of a Human A2A Adenosine Receptor bound to ZM241385.

• PDB DOI: 10.2210/pdb3EML/pdb

• Classification: MEMBRANE PROTEIN, RECEPTOR
• Organism(s): Homo sapiens, Escherichia virus T4
• Expression System: Spodoptera frugiperda
• Mutation(s): No 
• Membrane Protein: Yes  OPMPDBTMMemProtMDmpstruc


• Deposited: 2008-09-24 Released: 2008-10-14 
• Deposition Author(s): Jaakola, V.-P., Griffith, M.T., Hanson, M.A., Cherezov, V., Chien, E.Y.T., Lane, J.R., Ijzerman, A.P., Stevens, R.C., Accelerated Technologies Center for Gene to 3D Structure (ATCG3D), GPCR Network (GPCR)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.231 
• R-Value Work: 0.196 
• R-Value Observed: 0.198 

Literature

The 2.6 Angstrom Crystal Structure of a Human A2A Adenosine Receptor Bound to an Antagonist.

Jaakola, V.P., Griffith, M.T., Hanson, M.A., Cherezov, V., Chien, E.Y., Lane, J.R., Ijzerman, A.P., Stevens, R.C.

(2008) Science 322: 1211-1217

• PubMed: 18832607 
• DOI: 10.1126/science.1164772
• Primary Citation of Related Structures:  
  3EML


• PubMed Abstract: 
  

The adenosine class of heterotrimeric guanine nucleotide-binding protein (G protein)-coupled receptors (GPCRs) mediates the important role of extracellular adenosine in many physiological processes and is antagonized by caffeine. We have determined the crystal structure of the human A2A adenosine receptor, in complex with a high-affinity subtype-selective antagonist, ZM241385, to 2.6 angstrom resolution. Four disulfide bridges in the extracellular domain, combined with a subtle repacking of the transmembrane helices relative to the adrenergic and rhodopsin receptor structures, define a pocket distinct from that of other structurally determined GPCRs. The arrangement allows for the binding of the antagonist in an extended conformation, perpendicular to the membrane plane. The binding site highlights an integral role for the extracellular loops, together with the helical core, in ligand recognition by this class of GPCRs and suggests a role for ZM241385 in restricting the movement of a tryptophan residue important in the activation mechanism of the class A receptors.

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Organizational Affiliation: 

Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037 USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Human Adenosine A2A receptor/T4 lysozyme chimera	A	488	Homo sapiens, Escherichia virus T4	Mutation(s): 0  Gene Names: 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
Find proteins for P00720 (Enterobacteria phage T4) Explore P00720  Go to UniProtKB:  P00720
UniProt Groups	P29274P00720

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZMA	B [auth A]	4-{2-[(7-amino-2-furan-2-yl[1,2,4]triazolo[1,5-a][1,3,5]triazin-5-yl)amino]ethyl}phenol C16 H15 N7 O2 PWTBZOIUWZOPFT-UHFFFAOYSA-N
STE	C [auth A], D [auth A], E [auth A], F [auth A], G [auth A]	STEARIC ACID C18 H36 O2 QIQXTHQIDYTFRH-UHFFFAOYSA-N
SO4	H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Binding Affinity Annotations
ID	Source	Binding Affinity
ZMA	BindingDB:  3EML	Ki: min: 0.1, max: 64 (nM) from 16 assay(s)
		Kd: 0.22 (nM) from 1 assay(s)
		IC50: min: 0.68, max: 81 (nM) from 7 assay(s)
	PDBBind:  3EML	Kd: 1.8 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.60 Å
• R-Value Free: 0.231 
• R-Value Work: 0.196 
• R-Value Observed: 0.198 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 47.736	α = 90
b = 76.932	β = 101.32
c = 86.553	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
PHASER	phasing
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-09-24 
• Released Date: 2008-10-14 
Deposition Author(s): Jaakola, V.-P., Griffith, M.T., Hanson, M.A., Cherezov, V., Chien, E.Y.T., Lane, J.R., Ijzerman, A.P., Stevens, R.C., Accelerated Technologies Center for Gene to 3D Structure (ATCG3D), GPCR Network (GPCR)

Revision History  

• Version 1.0: 2008-10-14
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2012-08-08
  Changes: Other
• Version 1.3: 2017-08-02
  Changes: Refinement description, Source and taxonomy