3BKI

Crystal Structure of the GluR2 ligand binding core (S1S2J) in complex with FQX at 1.87 Angstroms


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

6-Azido-7-nitro-1,4-dihydroquinoxaline-2,3-dione (ANQX) forms an irreversible bond to the active site of the GluR2 AMPA receptor.

Cruz, L.A.Estebanez-Perpina, E.Pfaff, S.Borngraeber, S.Bao, N.Blethrow, J.Fletterick, R.J.England, P.M.

(2008) J.Med.Chem. 51: 5856-5860

  • DOI: 10.1021/jm701517b

  • PubMed Abstract: 
  • AMPA receptors mediate fast excitatory synaptic transmission and are essential for synaptic plasticity. ANQX, a photoreactive AMPA receptor antagonist, is an important biological probe used to irreversibly inactivate AMPA receptors. Here, using X-ray ...

    AMPA receptors mediate fast excitatory synaptic transmission and are essential for synaptic plasticity. ANQX, a photoreactive AMPA receptor antagonist, is an important biological probe used to irreversibly inactivate AMPA receptors. Here, using X-ray crystallography and mass spectroscopy, we report that ANQX forms two major products in the presence of the GluR2 AMPAR ligand-binding core (S1S2J). Upon photostimulation, ANQX reacts intramolecularly to form FQX or intermolecularly to form a covalent adduct with Glu705.


    Organizational Affiliation

    Graduate Program in Chemistry and Chemical Biology, University of California San Francisco, San Francisco, California 94158-2517, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor 2
P, B, C, D
263Rattus 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
FQX
Query on FQX

Download SDF File 
Download CCD File 
B, C, D, P
[1,2,5]oxadiazolo[3,4-g]quinoxaline-6,7(5H,8H)-dione 1-oxide
C8 H4 N4 O4
GBLOKWQVACPFGV-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
FQXIC50: 7600 nM BINDINGMOAD
FQXIC50: 7600 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.87 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.213 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 62.340α = 90.00
b = 92.260β = 90.00
c = 195.240γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data collection
CNSphasing
CNSrefinement
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-09-16
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-08-02
    Type: Data collection, Refinement description, Source and taxonomy