1OTT

Structure of the Escherichia coli ClC Chloride channel E148A mutant and Fab Complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.338 
  • R-Value Work: 0.296 
  • R-Value Observed: 0.296 

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This is version 1.2 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: 10.1126/science.1082708
  • Primary Citation of Related Structures:  
    1OTU, 1OTT, 1OTS

  • 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 ...

    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
MoleculeChainsSequence LengthOrganismDetailsImage
Voltage-gated ClC-type chloride channel eriC A, B465Escherichia coliMutation(s): 1 
Gene Names: ERIC OR B0155
Find proteins for P37019 (Escherichia coli (strain K12))
Explore P37019 
Go to UniProtKB:  P37019
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Fab fragment (Heavy chain) C, E222Mus musculusMutation(s): 0 
Find proteins for P01808 (Mus musculus)
Explore P01808 
Go to UniProtKB:  P01808
Protein Feature View
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  • Reference Sequence
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Fab fragment (Light chain) D, F211Mus musculusMutation(s): 0 
Gene Names: Igkc
Find proteins for P01837 (Mus musculus)
Explore P01837 
Go to UniProtKB:  P01837
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.338 
  • R-Value Work: 0.296 
  • R-Value Observed: 0.296 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 231.614α = 90
b = 95.719β = 131.45
c = 169.819γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SDMSdata scaling
AMoREphasing
DMphasing

Structure Validation

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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