1OTU

Structure of the Escherichia coli ClC Chloride channel E148Q mutant and Fab Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.294 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Gating the Selectivity Filter in ClC Chloride Channels

Dutzler, R.Campbell, E.B.MacKinnon, R.

(2003) Science 300: 108-112

  • DOI: https://doi.org/10.1126/science.1082708
  • Primary Citation of Related Structures:  
    1OTS, 1OTT, 1OTU

  • PubMed Abstract: 

    ClC channels conduct chloride (Cl-) ions across cell membranes and thereby govern the electrical activity of muscle cells and certain neurons, the transport of fluid and electrolytes across epithelia, and the acidification of intracellular vesicles. The structural basis of ClC channel gating was studied. Crystal structures of wild-type and mutant Escherichia coli ClC channels bound to a monoclonal Fab fragment reveal three Cl- binding sites within the 15-angstrom neck of an hourglass-shaped pore. The Cl- binding site nearest the extracellular solution can be occupied either by a Cl- ion or by a glutamate carboxyl group. Mutations of this glutamate residue in Torpedo ray ClC channels alter gating in electrophysiological assays. These findings reveal a form of gating in which the glutamate carboxyl group closes the pore by mimicking a Cl- ion.


  • Organizational Affiliation

    Howard Hughes Medical Institute, Laboratory of Molecular Neurobiology and Biophysics, Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Voltage-gated ClC-type chloride channel eriC
A, B
465Escherichia coliMutation(s): 1 
Gene Names: ERIC OR B0155
Membrane Entity: Yes 
UniProt
Find proteins for P37019 (Escherichia coli (strain K12))
Explore P37019 
Go to UniProtKB:  P37019
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP37019
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Fab fragment (Heavy chain)
C, E
222Mus musculusMutation(s): 0 
UniProt
Find proteins for P01808 (Mus musculus)
Explore P01808 
Go to UniProtKB:  P01808
Entity Groups  
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UniProt GroupP01808
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Fab fragment (Light chain)
D, F
211Mus musculusMutation(s): 0 
UniProt
Find proteins for P01837 (Mus musculus)
Explore P01837 
Go to UniProtKB:  P01837
Entity Groups  
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UniProt GroupP01837
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.30 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.294 
  • R-Value Observed: 0.294 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 232.113α = 90
b = 96.09β = 131.39
c = 170.284γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
DMphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description