3N6V

Structure of the GluA2 NTD-dimer interface mutant, T78A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 

Starting Model: experimental
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This is version 1.3 of the entry. See complete history


Literature

Subunit-selective N-terminal domain associations organize the formation of AMPA receptor heteromers

Rossmann, M.Sukumaran, M.Penn, A.C.Veprintsev, D.B.Babu, M.M.Greger, I.H.

(2011) EMBO J 30: 959-971

  • DOI: https://doi.org/10.1038/emboj.2011.16
  • Primary Citation of Related Structures:  
    3HSY, 3N6V, 3O2J

  • PubMed Abstract: 

    The assembly of AMPA-type glutamate receptors (AMPARs) into distinct ion channel tetramers ultimately governs the nature of information transfer at excitatory synapses. How cells regulate the formation of diverse homo- and heteromeric AMPARs is unknown. Using a sensitive biophysical approach, we show that the extracellular, membrane-distal AMPAR N-terminal domains (NTDs) orchestrate selective routes of heteromeric assembly via a surprisingly wide spectrum of subunit-specific association affinities. Heteromerization is dominant, occurs at the level of the dimer, and results in a preferential incorporation of the functionally critical GluA2 subunit. Using a combination of structure-guided mutagenesis and electrophysiology, we further map evolutionarily variable hotspots in the NTD dimer interface, which modulate heteromerization capacity. This 'flexibility' of the NTD not only explains why heteromers predominate but also how GluA2-lacking, Ca(2+)-permeable homomers could form, which are induced under specific physiological and pathological conditions. Our findings reveal that distinct NTD properties set the stage for the biogenesis of functionally diverse pools of homo- and heteromeric AMPAR tetramers.


  • Organizational Affiliation

    Neurobiology Division, MRC Laboratory of Molecular Biology, Cambridge, UK.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glutamate receptor 2
A, B, C, D, E
A, B, C, D, E, F
374Rattus norvegicusMutation(s): 1 
Gene Names: Gria2Glur2
UniProt
Find proteins for P19491 (Rattus norvegicus)
Explore P19491 
Go to UniProtKB:  P19491
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP19491
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.20 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.235 
  • R-Value Observed: 0.237 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 64.21α = 90
b = 120.15β = 90
c = 360.81γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
DNAdata collection
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Refinement description
  • Version 1.3: 2024-11-20
    Changes: Structure summary