3T9V

CNQX bound to a reduced double cysteine mutant (A452C/S652C) of the ligand binding domain of GluA2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.975 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mechanism of AMPA Receptor Activation by Partial Agonists: DISULFIDE TRAPPING OF CLOSED LOBE CONFORMATIONS.

Ahmed, A.H.Wang, S.Chuang, H.H.Oswald, R.E.

(2011) J.Biol.Chem. 286: 35257-35266

  • DOI: 10.1074/jbc.M111.269001
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mechanism by which agonist binding to an ionotropic glutamate receptor leads to channel opening is a central issue in molecular neurobiology. Partial agonists are useful tools for studying the activation mechanism because they produce full channe ...

    The mechanism by which agonist binding to an ionotropic glutamate receptor leads to channel opening is a central issue in molecular neurobiology. Partial agonists are useful tools for studying the activation mechanism because they produce full channel activation with lower probability than full agonists. Structural transitions that determine the efficacy of partial agonists can provide information on the trigger that begins the channel-opening process. The ligand-binding domain of AMPA receptors is a bilobed structure, and the closure of the lobes is associated with channel activation. One possibility is that partial agonists sterically block full lobe closure but that partial degrees of closure trigger the channel with a lower probability. Alternatively, full lobe closure may be required for activation, and the stability of the fully closed state could determine efficacy with the fully closed state having a lower stability when bound to partial relative to full agonists. Disulfide-trapping experiments demonstrated that even extremely low efficacy ligands such as 6-cyano-7-nitroquinoxaline-2,3-dione can produce a full lobe closure, presumably with low probability. The results are consistent the hypothesis that the efficacy is determined at least in part by the stability of the state in which the lobes are fully closed.


    Organizational Affiliation

    Department of Molecular Medicine, Cornell University, Ithaca, New York 14853, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor 2
A, B
258Rattus norvegicusMutation(s): 2 
Gene Names: Gria2 (Glur2)
Find proteins for P19491 (Rattus norvegicus)
Go to UniProtKB:  P19491
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
CNI
Query on CNI

Download SDF File 
Download CCD File 
A, B
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: 1.975 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.178 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 49.162α = 90.00
b = 58.704β = 93.41
c = 96.072γ = 90.00
Software Package:
Software NamePurpose
HKL-3000data collection
PHENIXmodel building
HKL-3000data scaling
PHENIXrefinement
HKL-3000data reduction
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-08-17
    Type: Initial release
  • Version 1.1: 2011-08-31
    Type: Database references
  • Version 1.2: 2011-10-19
    Type: Database references
  • Version 1.3: 2017-07-26
    Type: Source and taxonomy