3B7D

Crystal structure of the GLUR2 ligand binding core (HS1S2J) in complex with CNQX at 2.5 A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.255 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

TARP auxiliary subunits switch AMPA receptor antagonists into partial agonists.

Menuz, K.Stroud, R.M.Nicoll, R.A.Hays, F.A.

(2007) Science 318: 815-817

  • DOI: 10.1126/science.1146317

  • PubMed Abstract: 
  • Quinoxalinedione compounds such as 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) are the most commonly used alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor antagonists. However, we find that in the presence of transmembrane AMP ...

    Quinoxalinedione compounds such as 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) are the most commonly used alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor antagonists. However, we find that in the presence of transmembrane AMPA receptor regulatory proteins (TARPs), which are AMPA receptor auxiliary subunits, CNQX acts as a partial agonist. CNQX induced small depolarizing currents in neurons of the central nervous system, and reconstitution of this agonist activity required coexpression of TARPs. A crystal structure of CNQX bound to the TARP-less AMPA receptor ligand-binding domain showed that, although CNQX induces partial domain closure, this movement is not transduced into linker separation, suggesting that TARPs may increase agonist efficacy by strengthening the coupling between domain closure and channel opening. Our results demonstrate that the presence of an auxiliary subunit can determine whether a compound functions as an agonist or antagonist.


    Organizational Affiliation

    Department of Cellular and Molecular Pharmacology, University of California at San Francisco, San Francisco, CA 94143, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor 2
A, B, C, D, E, F, G, H
261Rattus norvegicusMutation(s): 0 
Gene Names: Gria2 (Glur2)
Find proteins for P19491 (Rattus norvegicus)
Go to UniProtKB:  P19491
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CNI
Query on CNI

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H
7-nitro-2,3-dioxo-2,3-dihydroquinoxaline-6-carbonitrile
C9 H2 N4 O4
IAWXTSMHXFRLQR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.255 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 66.582α = 81.85
b = 97.631β = 89.08
c = 100.970γ = 77.89
Software Package:
Software NamePurpose
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction
REFMACrefinement
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-11-20
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.2: 2017-08-02
    Type: Refinement description, Source and taxonomy