1KPL

Crystal Structure of the ClC Chloride Channel from S. typhimurium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.255 

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Ligand Structure Quality Assessment 


This is version 1.4 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: https://doi.org/10.1038/415287a
  • Primary Citation of Related Structures:  
    1KPK, 1KPL

  • 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 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:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
putative ClC family, chlorine transport protein
A, B, C, D
473Salmonella enterica subsp. enterica serovar TyphimuriumMutation(s): 2 
Membrane Entity: Yes 
UniProt
Find proteins for Q8ZRP8 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore Q8ZRP8 
Go to UniProtKB:  Q8ZRP8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8ZRP8
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
MYS
Query on MYS

Download Ideal Coordinates CCD File 
K [auth B],
P [auth D]
PENTADECANE
C15 H32
YCOZIPAWZNQLMR-UHFFFAOYSA-N
OCT
Query on OCT

Download Ideal Coordinates CCD File 
G [auth A],
N [auth C]
N-OCTANE
C8 H18
TVMXDCGIABBOFY-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
F [auth A],
I [auth B],
J [auth B],
M [auth C]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
CL
Query on CL

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B],
L [auth C],
O [auth D]
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.289 
  • R-Value Work: 0.254 
  • R-Value Observed: 0.255 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 185.719α = 90
b = 90.159β = 98.95
c = 80.753γ = 90
Software Package:
Software NamePurpose
SHARPphasing
CNSrefinement
DENZOdata reduction
SCALEPACKdata 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: 2002-01-23
    Type: Initial release
  • Version 1.1: 2008-04-27
    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: 2024-02-14
    Changes: Data collection