1KPL

Crystal Structure of the ClC Chloride Channel from S. typhimurium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.254 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray structure of a ClC chloride channel at 3.0 A reveals the molecular basis of anion selectivity.

Dutzler, R.Campbell, E.B.Cadene, M.Chait, B.T.MacKinnon, R.

(2002) Nature 415: 287-294

  • DOI: 10.1038/415287a
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The ClC chloride channels catalyse the selective flow of Cl- ions across cell membranes, thereby regulating electrical excitation in skeletal muscle and the flow of salt and water across epithelial barriers. Genetic defects in ClC Cl- channels underl ...

    The ClC chloride channels catalyse the selective flow of Cl- ions across cell membranes, thereby regulating electrical excitation in skeletal muscle and the flow of salt and water across epithelial barriers. Genetic defects in ClC Cl- channels underlie several familial muscle and kidney diseases. Here we present the X-ray structures of two prokaryotic ClC Cl- channels from Salmonella enterica serovar typhimurium and Escherichia coli at 3.0 and 3.5 A, respectively. Both structures reveal two identical pores, each pore being formed by a separate subunit contained within a homodimeric membrane protein. Individual subunits are composed of two roughly repeated halves that span the membrane with opposite orientations. This antiparallel architecture defines a selectivity filter in which a Cl- ion is stabilized by electrostatic interactions with alpha-helix dipoles and by chemical coordination with nitrogen atoms and hydroxyl groups. These findings provide a structural basis for further understanding the function of ClC Cl- channels, and establish the physical and chemical basis of their anion selectivity.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
putative ClC family, chlorine transport protein
A, B, C, D
473Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)Mutation(s): 2 
Gene Names: clcA (eriC)
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
H+/Cl- or F- Exchange Transporters
Protein: 
H+/Cl- Exchange Transporter
Find proteins for Q8ZRP8 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Go to UniProtKB:  Q8ZRP8
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
OCT
Query on OCT

Download SDF File 
Download CCD File 
A, C
N-OCTANE
C8 H18
TVMXDCGIABBOFY-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

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Download CCD File 
A, B, C
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C, D
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
MYS
Query on MYS

Download SDF File 
Download CCD File 
B, D
PENTADECANE
C15 H32
YCOZIPAWZNQLMR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.254 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 185.719α = 90.00
b = 90.159β = 98.95
c = 80.753γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
SHARPphasing
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-01-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance