4U5G

Crystal structure of con-ikot-ikot toxin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

wwPDB Validation 3D Report Full Report


This is version 1.3 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
  • Structures With Same Primary Citation

  • 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 impairme ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Con-ikot-ikotA, B90Conus striatusMutation(s): 0 
Find proteins for P0CB20 (Conus striatus)
Explore P0CB20 
Go to UniProtKB:  P0CB20
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 56.499α = 90
b = 56.499β = 90
c = 86.782γ = 120
Software Package:
Software NamePurpose
HKL-2000data scaling
PDB_EXTRACTdata extraction
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

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

Revision History 

  • 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: Advisory, Database references, Derived calculations, Other, Refinement description, Source and taxonomy