4ILC

The GLIC pentameric ligand-gated ion channel in complex with sulfates


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

Structural basis for ion permeation mechanism in pentameric ligand-gated ion channels.

Sauguet, L.Poitevin, F.Murail, S.Van Renterghem, C.Moraga-Cid, G.Malherbe, L.Thompson, A.W.Koehl, P.Corringer, P.J.Baaden, M.Delarue, M.

(2013) EMBO J 32: 728-741

  • DOI: https://doi.org/10.1038/emboj.2013.17
  • Primary Citation of Related Structures:  
    4HFI, 4IL4, 4IL9, 4ILA, 4ILB, 4ILC

  • PubMed Abstract: 

    To understand the molecular mechanism of ion permeation in pentameric ligand-gated ion channels (pLGIC), we solved the structure of an open form of GLIC, a prokaryotic pLGIC, at 2.4 Å. Anomalous diffraction data were used to place bound anions and cations. This reveals ordered water molecules at the level of two rings of hydroxylated residues (named Ser6' and Thr2') that contribute to the ion selectivity filter. Two water pentagons are observed, a self-stabilized ice-like water pentagon and a second wider water pentagon, with one sodium ion between them. Single-channel electrophysiology shows that the side-chain hydroxyl of Ser6' is crucial for ion translocation. Simulations and electrostatics calculations complemented the description of hydration in the pore and suggest that the water pentagons observed in the crystal are important for the ion to cross hydrophobic constriction barriers. Simulations that pull a cation through the pore reveal that residue Ser6' actively contributes to ion translocation by reorienting its side chain when the ion is going through the pore. Generalization of these findings to the pLGIC family is proposed.


  • Organizational Affiliation

    Unité de Dynamique Structurale des Macromolécules, Institut Pasteur, CNRS UMR3528, 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
320Gloeobacter violaceus PCC 7421Mutation(s): 0 
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 7 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PLC
Query on PLC

Download Ideal Coordinates CCD File 
BA [auth C]
CA [auth C]
G [auth A]
H [auth A]
MA [auth D]
BA [auth C],
CA [auth C],
G [auth A],
H [auth A],
MA [auth D],
NA [auth D],
R [auth B],
S [auth B],
WA [auth E],
XA [auth E]
DIUNDECYL PHOSPHATIDYL CHOLINE
C32 H65 N O8 P
IJFVSSZAOYLHEE-SSEXGKCCSA-O
LMT
Query on LMT

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CB [auth E]
HA [auth C]
M [auth A]
N [auth A]
SA [auth D]
CB [auth E],
HA [auth C],
M [auth A],
N [auth A],
SA [auth D],
X [auth B]
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
SO4
Query on SO4

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EB [auth E],
KA [auth C],
P [auth A],
UA [auth D],
Z [auth B]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
ACT
Query on ACT

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AA [auth C]
BB [auth E]
F [auth A]
GA [auth C]
L [auth A]
AA [auth C],
BB [auth E],
F [auth A],
GA [auth C],
L [auth A],
LA [auth D],
Q [auth B],
RA [auth D],
VA [auth E],
W [auth B]
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
CL
Query on CL

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AB [auth E],
FA [auth C],
K [auth A],
QA [auth D],
V [auth B]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
NA
Query on NA

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DB [auth E]
IA [auth C]
JA [auth C]
O [auth A]
TA [auth D]
DB [auth E],
IA [auth C],
JA [auth C],
O [auth A],
TA [auth D],
Y [auth B]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
UNL
Query on UNL

Download Ideal Coordinates CCD File 
DA [auth C]
EA [auth C]
I [auth A]
J [auth A]
OA [auth D]
DA [auth C],
EA [auth C],
I [auth A],
J [auth A],
OA [auth D],
PA [auth D],
T [auth B],
U [auth B],
YA [auth E],
ZA [auth E]
Unknown ligand
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.216 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 182.328α = 90
b = 132.1β = 103.02
c = 161.137γ = 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: 2013-02-20
    Type: Initial release
  • Version 1.1: 2013-03-20
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description