3G3J

Crystal structure of the GluR6 ligand binding domain dimer I442H K494E K665R I749L Q753K mutant with glutamate and NaCl at 1.32 Angstrom resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.321 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.156 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Stability of ligand-binding domain dimer assembly controls kainate receptor desensitization.

Chaudhry, C.Weston, M.C.Schuck, P.Rosenmund, C.Mayer, M.L.

(2009) Embo J. 28: 1518-1530

  • DOI: 10.1038/emboj.2009.86
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • AMPA and kainate receptors mediate fast synaptic transmission. AMPA receptor ligand-binding domains form dimers, which are key functional units controlling ion-channel activation and desensitization. Dimer stability is inversely related to the rate a ...

    AMPA and kainate receptors mediate fast synaptic transmission. AMPA receptor ligand-binding domains form dimers, which are key functional units controlling ion-channel activation and desensitization. Dimer stability is inversely related to the rate and extent of desensitization. Kainate and AMPA receptors share common structural elements, but functional measurements suggest that subunit assembly and gating differs between these subtypes. To investigate this, we constructed a library of GluR6 kainate receptor mutants and directly measured changes in kainate receptor dimer stability by analytical ultracentrifugation, which, combined with electrophysiological experiments, revealed an inverse correlation between dimer stability and the rate of desensitization. We solved crystal structures for a series of five GluR6 mutants, to understand the molecular mechanisms for dimer stabilization. We demonstrate that the desensitized state of kainate receptors acts as a deep energy well offsetting the stabilizing effects of dimer interface mutants, and that the deactivation of kainate receptor responses is dominated by entry into desensitized states. Our results show how neurotransmitter receptors with similar structures and gating mechanisms can exhibit strikingly different functional properties.


    Organizational Affiliation

    Laboratory of Cellular and Molecular Neurophysiology, Porter Neuroscience Research Center, NICHD, NIH, DHHS, Bethesda, MD, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor, ionotropic kainate 2
A, B
259Rattus norvegicusMutation(s): 5 
Gene Names: Grik2 (Glur6)
Find proteins for P42260 (Rattus norvegicus)
Go to UniProtKB:  P42260
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GLU
Query on GLU

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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: 1.321 Å
  • R-Value Free: 0.179 
  • R-Value Work: 0.156 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 50.915α = 90.00
b = 113.710β = 115.31
c = 51.939γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data scaling
PHENIXrefinement
HKL-2000data collection
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-06-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-07-26
    Type: Advisory, Source and taxonomy
  • Version 1.3: 2017-11-01
    Type: Refinement description