Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Hetero 6-mer - A2B2C2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 193236.98 
• Atom Count: 13221 
• Residue Count: 1796 
• Unique protein chains: 3

1OTT

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

• DOI: 10.2210/pdb1OTT/pdb

• Classification: MEMBRANE PROTEIN
• Organism(s): Mus musculus, Escherichia coli (strain K12)
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): 1 


• Deposited: 2003-03-23 Released: 2003-04-15 
• Deposition Author(s): Dutzler, R., Campbell, E.B., MacKinnon, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å
• R-Value Free: 0.338 
• R-Value Work: 0.296 

Literature

Gating the Selectivity Filter in ClC Chloride Channels

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

(2003) Science 300: 108-112

• PubMed: 12649487 
• DOI: 10.1126/science.1082708
• Primary Citation of Related Structures:  
  1OTU, 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. 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.

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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
Molecule	Chains	Sequence Length	Organism	Details
Voltage-gated ClC-type chloride channel eriC	A, B	465	Escherichia coli (strain K12)	Mutation(s): 1  Gene Names: clcA (eriC, yadQ)
Membrane protein mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  H+/Cl- or F- Exchange Transporters	Protein:  H+/Cl- Exchange Transporter
Find proteins for P37019 (Escherichia coli (strain K12)) Go to UniProtKB:  P37019

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Fab fragment (Heavy chain)	C, E	222	Mus musculus	Mutation(s): 0
Membrane protein mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  H+/Cl- or F- Exchange Transporters	Protein:  H+/Cl- Exchange Transporter
Find proteins for P01808 (Mus musculus) Go to UniProtKB:  P01808

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details
Fab fragment (Light chain)	D, F	211	Mus musculus	Mutation(s): 0  Gene Names: Igkc
Membrane protein mpstruc	Group:  TRANSMEMBRANE PROTEINS: ALPHA-HELICAL		Sub Group:  H+/Cl- or F- Exchange Transporters	Protein:  H+/Cl- Exchange Transporter
Find proteins for P01837 (Mus musculus) Go to UniProtKB:  P01837

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
CL	A, B	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3 Å
• R-Value Free: 0.338 
• R-Value Work: 0.296 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 231.614	α = 90.00
b = 95.719	β = 131.45
c = 169.819	γ = 90.00

Software Package:

Software Name	Purpose
DENZO	data reduction
CNS	refinement
AMoRE	phasing
SDMS	data scaling
DM	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-03-23 
• Released Date: 2003-04-15 
• Deposition Author(s): Dutzler, R., Campbell, E.B., MacKinnon, R.

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