2AHE

Crystal structure of a soluble form of CLIC4. intercellular chloride ion channel


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.194 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the soluble form of the redox-regulated chloride ion channel protein CLIC4.

Littler, D.R.Assaad, N.N.Harrop, S.J.Brown, L.J.Pankhurst, G.J.Luciani, P.Aguilar, M.-I.Mazzanti, M.Berryman, M.A.Breit, S.N.Curmi, P.M.G.

(2005) FEBS J. 272: 4996-5007

  • DOI: 10.1111/j.1742-4658.2005.04909.x

  • PubMed Abstract: 
  • The structure of CLIC4, a member of the CLIC family of putative intracellular chloride ion channel proteins, has been determined at 1.8 Angstroms resolution by X-ray crystallography. The protein is monomeric and it is structurally similar to CLIC1, b ...

    The structure of CLIC4, a member of the CLIC family of putative intracellular chloride ion channel proteins, has been determined at 1.8 Angstroms resolution by X-ray crystallography. The protein is monomeric and it is structurally similar to CLIC1, belonging to the GST fold class. Differences between the structures of CLIC1 and CLIC4 are localized to helix 2 in the glutaredoxin-like N-terminal domain, which has previously been shown to undergo a dramatic structural change in CLIC1 upon oxidation. The structural differences in this region correlate with the sequence differences, where the CLIC1 sequence appears to be atypical of the family. Purified, recombinant, wild-type CLIC4 is shown to bind to artificial lipid bilayers, induce a chloride efflux current when associated with artificial liposomes and produce an ion channel in artificial bilayers with a conductance of 30 pS. Membrane binding is enhanced by oxidation of CLIC4 while no channels were observed via tip-dip electrophysiology in the presence of a reducing agent. Thus, recombinant CLIC4 appears to be able to form a redox-regulated ion channel in the absence of any partner proteins.


    Organizational Affiliation

    School of Physics, University of New South Wales, Sydney, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Chloride intracellular channel protein 4
A
267Homo sapiensMutation(s): 0 
Gene Names: CLIC4
Find proteins for Q9Y696 (Homo sapiens)
Go to Gene View: CLIC4
Go to UniProtKB:  Q9Y696
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.194 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 77.717α = 90.00
b = 79.478β = 90.00
c = 42.600γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
REFMACrefinement
CCP4data scaling
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-08-16
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance