4KKB

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.021 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.236 

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: 10.1038/nchembio.1336
  • Primary Citation of Related Structures:  

  • 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 ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
H(+)/Cl(-) exchange transporter ClcA
A, B
446Escherichia coli (strain K12)Mutation(s): 1 
Gene Names: clcA (eriC, yadQ)
Find proteins for P37019 (Escherichia coli (strain K12))
Go to UniProtKB:  P37019
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Fab, heavy chain
C, E
222Mus musculusMutation(s): 0 
Find proteins for P01808 (Mus musculus)
Go to UniProtKB:  P01808
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Fab, light chain
D, F
211N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.021 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.236 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 231.718α = 90.00
b = 97.533β = 131.75
c = 170.568γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
HKL-2000data scaling
PHASERphasing
BOSdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-05-05 
  • Released Date: 2013-08-21 
  • Deposition Author(s): Lim, H.-H., Miller, C.

Revision History 

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