2I0C

Crystal structure of the GluR6 ligand binding core dimer crosslinked by disulfide bonds between Y490C and L752C at 2.25 Angstroms Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.172 

wwPDB Validation 3D Report Full Report


This is version 1.4 of the entry. See complete history

Literature

Conformational restriction blocks glutamate receptor desensitization.

Weston, M.C.Schuck, P.Ghosal, A.Rosenmund, C.Mayer, M.L.

(2006) Nat.Struct.Mol.Biol. 13: 1120-1127

  • DOI: 10.1038/nsmb1178
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Desensitization is a universal feature of ligand-gated ion channels. Using the crystal structure of the GluR2 L483Y mutant channel as a guide, we attempted to build non-desensitizing kainate-subtype glutamate receptors. Success was achieved for GluR5 ...

    Desensitization is a universal feature of ligand-gated ion channels. Using the crystal structure of the GluR2 L483Y mutant channel as a guide, we attempted to build non-desensitizing kainate-subtype glutamate receptors. Success was achieved for GluR5, GluR6 and GluR7 with intermolecular disulfide cross-links but not by engineering the dimer interface. Crystallographic analysis of the GluR6 Y490C L752C dimer revealed relaxation from the active conformation, which functional studies reveal is not sufficient to trigger desensitization. The equivalent non-desensitizing cross-linked GluR2 mutant retained weak sensitivity to a positive allosteric modulator, which had no effect on GluR2 L483Y. These results establish that the active conformation of AMPA and kainate receptors is conserved and further show that their desensitization requires dimer rearrangements, that subtle structural differences account for their diverse functional properties and that the ligand-binding core dimer is a powerful regulator of ion-channel activity.


    Organizational Affiliation

    Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor, ionotropic kainate 2
A, B
259Rattus norvegicusMutation(s): 3 
Gene Names: Grik2 (Glur6)
Find proteins for P42260 (Rattus norvegicus)
Go to UniProtKB:  P42260
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GLU
Query on GLU

Download SDF File 
Download CCD File 
A, B
GLUTAMIC ACID
C5 H9 N O4
WHUUTDBJXJRKMK-VKHMYHEASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.172 
  • Space Group: P 4
Unit Cell:
Length (Å)Angle (°)
a = 108.790α = 90.00
b = 108.790β = 90.00
c = 47.350γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
HKL-2000data reduction
MOLREPphasing
MAR345data collection
SERGUIdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-08-10 
  • Released Date: 2006-11-21 
  • Deposition Author(s): Mayer, M.L.

Revision History 

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Advisory, Version format compliance
  • Version 1.3: 2017-08-16
    Type: Advisory, Source and taxonomy
  • Version 1.4: 2017-10-18
    Type: Refinement description