5MZQ

X-ray structure of the M205W mutant of GLIC in complex with bromoform


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis for a Bimodal Allosteric Mechanism of General Anesthetic Modulation in Pentameric Ligand-Gated Ion Channels.

Fourati, Z.Howard, R.J.Heusser, S.A.Hu, H.Ruza, R.R.Sauguet, L.Lindahl, E.Delarue, M.

(2018) Cell Rep 23: 993-1004

  • DOI: 10.1016/j.celrep.2018.03.108
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ion channel modulation by general anesthetics is a vital pharmacological process with implications for receptor biophysics and drug development. Functional studies have implicated conserved sites of both potentiation and inhibition in pentameric liga ...

    Ion channel modulation by general anesthetics is a vital pharmacological process with implications for receptor biophysics and drug development. Functional studies have implicated conserved sites of both potentiation and inhibition in pentameric ligand-gated ion channels, but a detailed structural mechanism for these bimodal effects is lacking. The prokaryotic model protein GLIC recapitulates anesthetic modulation of human ion channels, and it is accessible to structure determination in both apparent open and closed states. Here, we report ten X-ray structures and electrophysiological characterization of GLIC variants in the presence and absence of general anesthetics, including the surgical agent propofol. We show that general anesthetics can allosterically favor closed channels by binding in the pore or favor open channels via various subsites in the transmembrane domain. Our results support an integrated, multi-site mechanism for allosteric modulation, and they provide atomic details of both potentiation and inhibition by one of the most common general anesthetics.


    Organizational Affiliation

    Department of Biochemistry and Biophysics and Science for Life Laboratory, Stockholm University, 17165 Solna, Sweden.,Unit of Structural Dynamics of Macromolecules, Institut Pasteur and UMR 3528 du CNRS, 75015 Paris, France. Electronic address: delarue@pasteur.fr.,Department of Biochemistry and Biophysics and Science for Life Laboratory, Stockholm University, 17165 Solna, Sweden; Swedish e-Science Research Center, KTH Royal Institute of Technology, 11428 Stockholm, Sweden.,Unit of Structural Dynamics of Macromolecules, Institut Pasteur and UMR 3528 du CNRS, 75015 Paris, France; Sorbonne Universit├ęs, UPMC University Paris 6, 75005 Paris, France.,Unit of Structural Dynamics of Macromolecules, Institut Pasteur and UMR 3528 du CNRS, 75015 Paris, France.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proton-gated ion channel
A, B, C, D, E
327Gloeobacter violaceus (strain ATCC 29082 / PCC 7421)Mutation(s): 1 
Gene Names: glvI
Membrane protein
mpstruc
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Cys-Loop Receptor Family
Protein: 
Prokaryotic pentameric ligand-gated ion channel (GLIC)
Find proteins for Q7NDN8 (Gloeobacter violaceus (strain ATCC 29082 / PCC 7421))
Go to UniProtKB:  Q7NDN8
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NA
Query on NA

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Download CCD File 
A, B, C, D, E
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
MBR
Query on MBR

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Download CCD File 
A, B, C, D, E
TRIBROMOMETHANE
C H Br3
DIKBFYAXUHHXCS-UHFFFAOYSA-N
 Ligand Interaction
ACT
Query on ACT

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Download CCD File 
A, B, C, D, E
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

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Download CCD File 
A, B, C, D, E
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
PC8
Query on PC8

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Download CCD File 
A, B, C, D, E
1,2-DIOCTANOYL-SN-GLYCERO-3-PHOSPHOCHOLINE
C24 H49 N O8 P
YHIXRNNWDBPKPW-JOCHJYFZSA-O
 Ligand Interaction
D12
Query on D12

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Download CCD File 
A, B, C, D, E
DODECANE
C12 H26
SNRUBQQJIBEYMU-UHFFFAOYSA-N
 Ligand Interaction
2IL
Query on 2IL

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Download CCD File 
A, B, C, D, E
(3R)-3-(dodecanoyloxy)tetradecanoic acid
C26 H50 O4
IKRFTYQBIVDIMM-XMMPIXPASA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.219 
  • R-Value Work: 0.202 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 181.969α = 90.00
b = 131.779β = 102.93
c = 160.404γ = 90.00
Software Package:
Software NamePurpose
Aimlessdata scaling
REFMACphasing
BUSTERrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2018-02-28
    Type: Initial release
  • Version 1.1: 2018-06-20
    Type: Data collection, Database references
  • Version 1.2: 2019-10-16
    Type: Data collection