3ZKR

X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) in complex with bromoform


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.649 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.229 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Multisite Binding of a General Anesthetic to the Prokaryotic Pentameric Erwinia Chrysanthemi Ligand-Gated Ion Channel (Elic).

Spurny, R.Billen, B.Howard, R.J.Brams, M.Debaveye, S.Price, K.L.Weston, D.A.Strelkov, S.V.Tytgat, J.Bertrand, S.Bertrand, D.Lummis, S.C.R.Ulens, C.

(2013) J.Biol.Chem. 288: 8355

  • DOI: 10.1074/jbc.M112.424507

  • PubMed Abstract: 
  • Pentameric ligand-gated ion channels (pLGICs), such as nicotinic acetylcholine, glycine, γ-aminobutyric acid GABA(A/C) receptors, and the Gloeobacter violaceus ligand-gated ion channel (GLIC), are receptors that contain multiple allosteric binding si ...

    Pentameric ligand-gated ion channels (pLGICs), such as nicotinic acetylcholine, glycine, γ-aminobutyric acid GABA(A/C) receptors, and the Gloeobacter violaceus ligand-gated ion channel (GLIC), are receptors that contain multiple allosteric binding sites for a variety of therapeutics, including general anesthetics. Here, we report the x-ray crystal structure of the Erwinia chrysanthemi ligand-gated ion channel (ELIC) in complex with a derivative of chloroform, which reveals important features of anesthetic recognition, involving multiple binding at three different sites. One site is located in the channel pore and equates with a noncompetitive inhibitor site found in many pLGICs. A second transmembrane site is novel and is located in the lower part of the transmembrane domain, at an interface formed between adjacent subunits. A third site is also novel and is located in the extracellular domain in a hydrophobic pocket between the β7-β10 strands. Together, these results extend our understanding of pLGIC modulation and reveal several specific binding interactions that may contribute to modulator recognition, further substantiating a multisite model of allosteric modulation in this family of ion channels.


    Organizational Affiliation

    Laboratory of Structural Neurobiology, Department of Cellular and Molecular Medicine, KU Leuven, Herestraat 49, PB 601, B-3000 Leuven, Belgium.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYS-LOOP LIGAND-GATED ION CHANNEL
A, B, C, D, E, F, G, H, I, J
307Dickeya chrysanthemiMutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Prokaryotic pentameric ligand-gated ion channel (ELIC)
Find proteins for P0C7B7 (Dickeya chrysanthemi)
Go to UniProtKB:  P0C7B7
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MBR
Query on MBR

Download SDF File 
Download CCD File 
A, B, C, D, E, F, G, H, I, J
TRIBROMOMETHANE
C H Br3
DIKBFYAXUHHXCS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.649 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.229 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 105.109α = 90.00
b = 266.248β = 109.78
c = 110.746γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2013-02-06
    Type: Initial release
  • Version 1.1: 2013-04-03
    Type: Database references
  • Version 1.2: 2014-09-17
    Type: Atomic model, Derived calculations, Non-polymer description, Other