1OTU

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.294 

wwPDB Validation 3D Report Full Report


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:  1OTS, 1OTT

  • 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. ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Voltage-gated ClC-type chloride channel eriC
A, B
465Escherichia coli (strain K12)Gene Names: clcA (eriC, yadQ)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
H+/Cl-Exchange Transporters
Protein: 
H+/Cl- Exchange Transporter
Find proteins for P37019 (Escherichia coli (strain K12))
Go to UniProtKB:  P37019
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab fragment (Heavy chain)
C, E
222Mus musculusN/A
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
H+/Cl-Exchange Transporters
Protein: 
H+/Cl- Exchange Transporter
Find proteins for P01808 (Mus musculus)
Go to UniProtKB:  P01808
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Fab fragment (Light chain)
D, F
211Mus musculusN/A
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
H+/Cl-Exchange Transporters
Protein: 
H+/Cl- Exchange Transporter
Find proteins for P01837 (Mus musculus)
Go to UniProtKB:  P01837
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.3 Å
  • R-Value Free: 0.325 
  • R-Value Work: 0.294 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 232.113α = 90.00
b = 96.090β = 131.39
c = 170.284γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
AMoREphasing
SCALEPACKdata scaling
DMphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-04-15
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance