4KKA

Structure of the E148A mutant of CLC-ec1 deltaNC construct in 100mM fluoride and 20mM Bromide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Fluoride-dependent interruption of the transport cycle of a CLC Cl(-)/H(+) antiporter.

Lim, H.H.Stockbridge, R.B.Miller, C.

(2013) Nat Chem Biol 9: 721-725

  • DOI: https://doi.org/10.1038/nchembio.1336
  • Primary Citation of Related Structures:  
    4KJP, 4KJQ, 4KJW, 4KK5, 4KK6, 4KK8, 4KK9, 4KKA, 4KKB, 4KKC, 4KKL

  • PubMed Abstract: 

    Cl(-)/H(+) antiporters of the CLC superfamily transport anions across biological membranes in varied physiological contexts. These proteins are weakly selective among anions commonly studied, including Cl(-), Br(-), I(-), NO3(-) and SCN(-), but they seem to be very selective against F(-). The recent discovery of a new CLC clade of F(-)/H(+) antiporters, which are highly selective for F(-) over Cl(-), led us to investigate the mechanism of Cl(-)-over-F(-) selectivity by a CLC Cl(-)/H(+) antiporter, CLC-ec1. By subjecting purified CLC-ec1 to anion transport measurements, electrophysiological recording, equilibrium ligand-binding studies and X-ray crystallography, we show that F(-) binds in the Cl(-) transport pathway with affinity similar to Cl(-) but stalls the transport cycle. Examination of various mutant antiporters implies a 'lock-down' mechanism of F(-) inhibition, in which F(-), by virtue of its unique hydrogen-bonding chemistry, greatly retards a proton-linked conformational change essential for the transport cycle of CLC-ec1.


  • Organizational Affiliation

    1] Department of Biochemistry, Brandeis University, Waltham, Massachusetts, USA. [2] Howard Hughes Medical Institute, Brandeis University, Waltham, Massachusetts, USA. [3].


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
H(+)/Cl(-) exchange transporter ClcA
A, B
446Escherichia coli K-12Mutation(s): 1 
Gene Names: b0155clcAeriCJW5012yadQ
Membrane Entity: Yes 
UniProt
Find proteins for P37019 (Escherichia coli (strain K12))
Explore P37019 
Go to UniProtKB:  P37019
Entity Groups  
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UniProt GroupP37019
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Fab, heavy chain
C, E
222Mus musculusMutation(s): 0 
Entity Groups  
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Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Fab, light chain
D, F
211Mus musculusMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • R-Value Free: 0.265 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.222 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 231.338α = 90
b = 99.339β = 131.94
c = 170.29γ = 90
Software Package:
Software NamePurpose
BOSdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-21
    Type: Initial release
  • Version 1.1: 2013-10-09
    Changes: Database references
  • Version 1.2: 2013-11-13
    Changes: Database references