2EXY

Crystal structure of the E148Q Mutant of EcClC, Fab complexed in absence of bound ions


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.352 
  • R-Value Work: 0.328 
  • R-Value Observed: 0.328 

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This is version 1.3 of the entry. See complete history


Literature

Ion-binding properties of the ClC chloride selectivity filter.

Lobet, S.Dutzler, R.

(2006) EMBO J 25: 24-33

  • DOI: 10.1038/sj.emboj.7600909
  • Primary Citation of Related Structures:  
    2EXW, 2EXY, 2EZ0

  • PubMed Abstract: 
  • The ClC channels are members of a large protein family of chloride (Cl-) channels and secondary active Cl- transporters. Despite their diverse functions, the transmembrane architecture within the family is conserved. Here we present a crystallographic study on the ion-binding properties of the ClC selectivity filter in the close homolog from Escherichia coli (EcClC) ...

    The ClC channels are members of a large protein family of chloride (Cl-) channels and secondary active Cl- transporters. Despite their diverse functions, the transmembrane architecture within the family is conserved. Here we present a crystallographic study on the ion-binding properties of the ClC selectivity filter in the close homolog from Escherichia coli (EcClC). The ClC selectivity filter contains three ion-binding sites that bridge the extra- and intracellular solutions. The sites bind Cl- ions with mM affinity. Despite their close proximity within the filter, the three sites can be occupied simultaneously. The ion-binding properties are found conserved from the bacterial transporter EcClC to the human Cl- channel ClC-1, suggesting a close functional link between ion permeation in the channels and active transport in the transporters. In resemblance to K+ channels, ions permeate the ClC channel in a single file, with mutual repulsion between the ions fostering rapid conduction.


    Organizational Affiliation

    Department of Biochemistry, University of Zürich, Zürich, Switzerland.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
H(+)/Cl(-) exchange transporter clcAA, B473Escherichia coliMutation(s): 1 
Membrane Entity: Yes 
UniProt
Find proteins for P37019 (Escherichia coli (strain K12))
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Go to UniProtKB:  P37019
Entity Groups  
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UniProt GroupP37019
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 
UniProt
Find proteins for P01808 (Mus musculus)
Explore P01808 
Go to UniProtKB:  P01808
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UniProt GroupP01808
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Fab Fragment (Light Chain)D, F211Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.352 
  • R-Value Work: 0.328 
  • R-Value Observed: 0.328 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 219.64α = 90
b = 119.788β = 128.09
c = 151.3γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-01-24
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references