4X5T

alpha 1 glycine receptor transmembrane structure fused to the extracellular domain of GLIC


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.254 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Allosteric and hyperekplexic mutant phenotypes investigated on an alpha 1 glycine receptor transmembrane structure.

Moraga-Cid, G.Sauguet, L.Huon, C.Malherbe, L.Girard-Blanc, C.Petres, S.Murail, S.Taly, A.Baaden, M.Delarue, M.Corringer, P.J.

(2015) Proc.Natl.Acad.Sci.USA 112: 2865-2870

  • DOI: 10.1073/pnas.1417864112

  • PubMed Abstract: 
  • The glycine receptor (GlyR) is a pentameric ligand-gated ion channel (pLGIC) mediating inhibitory transmission in the nervous system. Its transmembrane domain (TMD) is the target of allosteric modulators such as general anesthetics and ethanol and is ...

    The glycine receptor (GlyR) is a pentameric ligand-gated ion channel (pLGIC) mediating inhibitory transmission in the nervous system. Its transmembrane domain (TMD) is the target of allosteric modulators such as general anesthetics and ethanol and is a major locus for hyperekplexic congenital mutations altering the allosteric transitions of activation or desensitization. We previously showed that the TMD of the human α1GlyR could be fused to the extracellular domain of GLIC, a bacterial pLGIC, to form a functional chimera called Lily. Here, we overexpress Lily in Schneider 2 insect cells and solve its structure by X-ray crystallography at 3.5 Å resolution. The TMD of the α1GlyR adopts a closed-channel conformation involving a single ring of hydrophobic residues at the center of the pore. Electrophysiological recordings show that the phenotypes of key allosteric mutations of the α1GlyR, scattered all along the pore, are qualitatively preserved in this chimera, including those that confer decreased sensitivity to agonists, constitutive activity, decreased activation kinetics, or increased desensitization kinetics. Combined structural and functional data indicate a pore-opening mechanism for the α1GlyR, suggesting a structural explanation for the effect of some key hyperekplexic allosteric mutations. The first X-ray structure of the TMD of the α1GlyR solved here using GLIC as a scaffold paves the way for mechanistic investigation and design of allosteric modulators of a human receptor.


    Organizational Affiliation

    Channel-Receptors Unit, Institut Pasteur, 75015 Paris, France; CNRS UMR 3571, 75015 Paris, France;




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Proton-gated ion channel,GLRA1 protein,GLRA1 protein
A, B, C, D, E
330Gloeobacter violaceus (strain PCC 7421)Homo sapiens
This entity is chimeric
Mutation(s): 0 
Gene Names: glvI, GLRA1
Find proteins for Q7NDN8 (Gloeobacter violaceus (strain PCC 7421))
Go to UniProtKB:  Q7NDN8
Find proteins for P23415 (Homo sapiens)
Go to Gene View: GLRA1
Go to UniProtKB:  P23415
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

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

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

Download SDF File 
Download CCD File 
A, B, C, D, E
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.5 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.254 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 118.894α = 90.00
b = 132.304β = 90.00
c = 190.517γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
PHASERphasing
XDSdata reduction
BUSTERrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-02-25
    Type: Initial release
  • Version 1.1: 2015-03-11
    Type: Database references
  • Version 1.2: 2015-03-18
    Type: Database references