6HK0

X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) F16'S pore mutant (F247S) with alternate M4 conformation.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.45 Å
  • R-Value Free: 
    0.266 (Depositor), 0.270 (DCC) 
  • R-Value Work: 
    0.228 (Depositor), 0.240 (DCC) 
  • R-Value Observed: 
    0.230 (Depositor) 

Starting Model: experimental
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Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted LMTClick on this verticalbar to view details

This is version 1.3 of the entry. See complete history


Literature

A lipid site shapes the agonist response of a pentameric ligand-gated ion channel.

Henault, C.M.Govaerts, C.Spurny, R.Brams, M.Estrada-Mondragon, A.Lynch, J.Bertrand, D.Pardon, E.Evans, G.L.Woods, K.Elberson, B.W.Cuello, L.G.Brannigan, G.Nury, H.Steyaert, J.Baenziger, J.E.Ulens, C.

(2019) Nat Chem Biol 15: 1156-1164

  • DOI: https://doi.org/10.1038/s41589-019-0369-4
  • Primary Citation of Related Structures:  
    6HJX, 6HJY, 6HK0

  • PubMed Abstract: 

    Phospholipids are key components of cellular membranes and are emerging as important functional regulators of different membrane proteins, including pentameric ligand-gated ion channels (pLGICs). Here, we take advantage of the prokaryote channel ELIC (Erwinia ligand-gated ion channel) as a model to understand the determinants of phospholipid interactions in this family of receptors. A high-resolution structure of ELIC in a lipid-bound state reveals a phospholipid site at the lower half of pore-forming transmembrane helices M1 and M4 and at a nearby site for neurosteroids, cholesterol or general anesthetics. This site is shaped by an M4-helix kink and a Trp-Arg-Pro triad that is highly conserved in eukaryote GABA A/C and glycine receptors. A combined approach reveals that M4 is intrinsically flexible and that M4 deletions or disruptions of the lipid-binding site accelerate desensitization in ELIC, suggesting that lipid interactions shape the agonist response. Our data offer a structural context for understanding lipid modulation in pLGICs.


  • Organizational Affiliation

    Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, Ontario, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Cys-loop ligand-gated ion channel
A, B, C, D, E
307Dickeya chrysanthemiMutation(s): 0 
Membrane Entity: Yes 
UniProt
Find proteins for P0C7B7 (Dickeya chrysanthemi)
Explore P0C7B7 
Go to UniProtKB:  P0C7B7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0C7B7
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LMT
Query on LMT

Download Ideal Coordinates CCD File 
K [auth A]
L [auth B]
M [auth C]
N [auth D]
O [auth E]
DODECYL-BETA-D-MALTOSIDE
C24 H46 O11
NLEBIOOXCVAHBD-QKMCSOCLSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.45 Å
  • R-Value Free:  0.266 (Depositor), 0.270 (DCC) 
  • R-Value Work:  0.228 (Depositor), 0.240 (DCC) 
  • R-Value Observed: 0.230 (Depositor) 
Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.8α = 90
b = 264.697β = 108.8
c = 111.185γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted LMTClick on this verticalbar to view details

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2019-10-09
    Type: Initial release
  • Version 1.1: 2019-10-23
    Changes: Data collection, Database references
  • Version 1.2: 2019-11-27
    Changes: Database references
  • Version 1.3: 2024-01-17
    Changes: Data collection, Database references, Refinement description