3QLV

Crystal structure of the GluK2/GluK5 (GluR6/KA2) ATD tetramer assembly


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.94 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.264 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure and assembly mechanism for heteromeric kainate receptors.

Kumar, J.Schuck, P.Mayer, M.L.

(2011) Neuron 71: 319-331

  • DOI: 10.1016/j.neuron.2011.05.038
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Native glutamate receptor ion channels are tetrameric assemblies containing two or more different subunits. NMDA receptors are obligate heteromers formed by coassembly of two or three divergent gene families. While some AMPA and kainate receptors can ...

    Native glutamate receptor ion channels are tetrameric assemblies containing two or more different subunits. NMDA receptors are obligate heteromers formed by coassembly of two or three divergent gene families. While some AMPA and kainate receptors can form functional homomeric ion channels, the KA1 and KA2 subunits are obligate heteromers which function only in combination with GluR5-7. The mechanisms controlling glutamate receptor assembly involve an initial step in which the amino terminal domains (ATD) assemble as dimers. Here, we establish by sedimentation velocity that the ATDs of GluR6 and KA2 coassemble as a heterodimer of K(d) 11 nM, 32,000-fold lower than the K(d) for homodimer formation by KA2; we solve crystal structures for the GluR6/KA2 ATD heterodimer and heterotetramer assemblies. Using these structures as a guide, we perform a mutant cycle analysis to probe the energetics of assembly and show that high-affinity ATD interactions are required for biosynthesis of functional heteromeric receptors.


    Organizational Affiliation

    Laboratory of Cellular and Molecular Neurophysiology, Porter Neuroscience Research Center, NICHD, NIH, DHHS, Bethesda, MD 20892, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor, ionotropic kainate 5
A, B, E, G, I
393Rattus norvegicusMutation(s): 0 
Gene Names: Grik5
Find proteins for Q63273 (Rattus norvegicus)
Go to UniProtKB:  Q63273
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Glutamate receptor, ionotropic kainate 2
C, D, F, H, J
395Rattus norvegicusMutation(s): 0 
Gene Names: Grik2 (Glur6)
Find proteins for P42260 (Rattus norvegicus)
Go to UniProtKB:  P42260
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.94 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.264 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 366.552α = 90.00
b = 109.176β = 97.54
c = 155.469γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling
PHASERphasing
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2011-02-03 
  • Released Date: 2011-08-03 
  • Deposition Author(s): Kumar, J., Mayer, M.L.

Revision History 

  • Version 1.0: 2011-08-03
    Type: Initial release
  • Version 1.1: 2012-10-10
    Type: Database references