X-ray structure of a pentameric ligand gated ion channel from Erwinia chrysanthemi (ELIC) in complex with GABA and flurazepam

Experimental Data Snapshot

  • Resolution: 3.90 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 

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Pentameric Ligand-Gated Ion Channel Elic is Activated by Gaba and Modulated by Benzodiazepines.

Spurny, R.Ramerstorfer, J.Price, K.Brams, M.Ernst, M.Nury, H.Verheij, M.Legrand, P.Bertrand, D.Bertrand, S.Dougherty, D.A.De Esch, I.J.P.Corringer, P.Sieghart, W.Lummis, S.C.R.Ulens, C.

(2012) Proc Natl Acad Sci U S A 109: E3028

  • DOI: https://doi.org/10.1073/pnas.1208208109
  • Primary Citation of Related Structures:  
    2YOE, 4A97, 4A98

  • PubMed Abstract: 

    GABA(A) receptors are pentameric ligand-gated ion channels involved in fast inhibitory neurotransmission and are allosterically modulated by the anxiolytic, anticonvulsant, and sedative-hypnotic benzodiazepines. Here we show that the prokaryotic homolog ELIC also is activated by GABA and is modulated by benzodiazepines with effects comparable to those at GABA(A) receptors. Crystal structures reveal important features of GABA recognition and indicate that benzodiazepines, depending on their concentration, occupy two possible sites in ELIC. An intrasubunit site is adjacent to the GABA-recognition site but faces the channel vestibule. A second intersubunit site partially overlaps with the GABA site and likely corresponds to a low-affinity benzodiazepine-binding site in GABA(A) receptors that mediates inhibitory effects of the benzodiazepine flurazepam. Our study offers a structural view how GABA and benzodiazepines are recognized at a GABA-activated ion channel.

  • Organizational Affiliation

    Department of Cellular and Molecular Medicine, Laboratory of Structural Neurobiology, Catholic University of Leuven, 3000 Leuven, Belgium.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D, E
A, B, C, D, E, F, G, H, I, J
307Dickeya chrysanthemiMutation(s): 0 
Membrane Entity: Yes 
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.90 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.185 
  • R-Value Observed: 0.188 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.771α = 90
b = 266.512β = 108.82
c = 110.982γ = 90
Software Package:
Software NamePurpose
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: 2012-10-31
    Type: Initial release
  • Version 1.1: 2012-11-14
    Changes: Database references
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Database references, Derived calculations, Other
  • Version 2.1: 2023-12-20
    Changes: Refinement description