5HCM

The GLIC pentameric Ligand-Gated Ion Channel 2-21' cross-linked mutant complexed to bromoform


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.231 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Sites of Anesthetic Inhibitory Action on a Cationic Ligand-Gated Ion Channel.

Laurent, B.Murail, S.Shahsavar, A.Sauguet, L.Delarue, M.Baaden, M.

(2016) Structure 24: 595-605

  • DOI: https://doi.org/10.1016/j.str.2016.02.014
  • Primary Citation of Related Structures:  
    5HCJ, 5HCM

  • PubMed Abstract: 

    Pentameric ligand-gated ion channels have been identified as the principal target of general anesthetics (GA), whose molecular mechanism of action remains poorly understood. Bacterial homologs, such as the Gloeobacter violaceus receptor (GLIC), have been shown to be valid functional models of GA action. The GA bromoform inhibits GLIC at submillimolar concentration. We characterize bromoform binding by crystallography and molecular dynamics (MD) simulations. GLIC's open form structure identified three intra-subunit binding sites. We crystallized the locally closed form with an additional bromoform molecule in the channel pore. We systematically compare binding with the multiple potential sites of allosteric channel regulation in the open, locally closed, and resting forms. MD simulations reveal differential exchange pathways between sites from one form to the other. GAs predominantly access the receptor from the lipid bilayer in all cases. Differential binding affinity among the channel forms is observed; the pore site markedly stabilizes the inactive versus active state.


  • Organizational Affiliation

    Laboratoire de Biochimie Théorique, CNRS, UPR9080, University Paris Diderot, Sorbonne Paris Cité, 13 rue Pierre et Marie Curie, 75005 Paris, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Proton-gated ion channel
A, B, C, D, E
317Gloeobacter violaceusMutation(s): 3 
Gene Names: glvIglr4197
Membrane Entity: Yes 
UniProt
Find proteins for Q7NDN8 (Gloeobacter violaceus (strain ATCC 29082 / PCC 7421))
Explore Q7NDN8 
Go to UniProtKB:  Q7NDN8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7NDN8
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LMT
Query on LMT

Download Ideal Coordinates CCD File 
F [auth C]DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
MBR
Query on MBR

Download Ideal Coordinates CCD File 
G [auth D]TRIBROMOMETHANE
C H Br3
DIKBFYAXUHHXCS-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.15 Å
  • R-Value Free: 0.240 
  • R-Value Work: 0.230 
  • R-Value Observed: 0.231 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 177.268α = 90
b = 130.934β = 100.31
c = 155.76γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
SCALAdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-13
    Type: Initial release
  • Version 1.1: 2016-04-20
    Changes: Database references