4U5E

Crystal structure of GluA2 T625G, con-ikot-ikot snail toxin, partial agonist KA and postitive modulator (R,R)-2b complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.51 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.242 

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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

X-ray structures of AMPA receptor-cone snail toxin complexes illuminate activation mechanism.

Chen, L.Durr, K.L.Gouaux, E.

(2014) Science 345: 1021-1026

  • DOI: 10.1126/science.1258409
  • Primary Citation of Related Structures:  
    4U5D, 4U5E, 4U5F, 4U5G, 4U5H, 4U5B, 4U5C

  • PubMed Abstract: 
  • AMPA-sensitive glutamate receptors are crucial to the structural and dynamic properties of the brain, to the development and function of the central nervous system, and to the treatment of neurological conditions from depression to cognitive impairment. However, the molecular principles underlying AMPA receptor activation have remained elusive ...

    AMPA-sensitive glutamate receptors are crucial to the structural and dynamic properties of the brain, to the development and function of the central nervous system, and to the treatment of neurological conditions from depression to cognitive impairment. However, the molecular principles underlying AMPA receptor activation have remained elusive. We determined multiple x-ray crystal structures of the GluA2 AMPA receptor in complex with a Conus striatus cone snail toxin, a positive allosteric modulator, and orthosteric agonists, at 3.8 to 4.1 angstrom resolution. We show how the toxin acts like a straightjacket on the ligand-binding domain (LBD) "gating ring," restraining the domains via both intra- and interdimer cross-links such that agonist-induced closure of the LBD "clamshells" is transduced into an irislike expansion of the gating ring. By structural analysis of activation-enhancing mutants, we show how the expansion of the LBD gating ring results in pulling forces on the M3 helices that, in turn, are coupled to ion channel gating.


    Organizational Affiliation

    Vollum Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA. Howard Hughes Medical Institute, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA. gouauxe@ohsu.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Glutamate receptor 2A, B, C, D814Rattus norvegicusMutation(s): 24 
Gene Names: Gria2Glur2
Membrane Entity: Yes 
UniProt
Find proteins for P19491 (Rattus norvegicus)
Explore P19491 
Go to UniProtKB:  P19491
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Con-ikot-ikotE, F90Conus striatusMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0CB20 (Conus striatus)
Explore P0CB20 
Go to UniProtKB:  P0CB20
Protein Feature View
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  • Reference Sequence
Small Molecules
Binding Affinity Annotations 
IDSourceBinding Affinity
KAI BindingDB:  4U5E Ki: min: 3690, max: 1.22e+4 (nM) from 4 assay(s)
EC50: min: 1.06e+4, max: 3.80e+5 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.51 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.240 
  • R-Value Observed: 0.242 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 161.27α = 90
b = 366.69β = 90
c = 109.01γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

  • Deposited Date: 2014-07-25 
  • Released Date: 2014-08-13 
  • Deposition Author(s): Chen, L., Gouaux, E.

Revision History  (Full details and data files)

  • Version 1.0: 2014-08-13
    Type: Initial release
  • Version 1.1: 2014-08-27
    Changes: Database references
  • Version 1.2: 2014-10-01
    Changes: Database references
  • Version 1.3: 2017-11-22
    Changes: Database references, Derived calculations, Other, Refinement description, Source and taxonomy, Structure summary
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Derived calculations, Refinement description, Structure summary