1RK4

Crystal Structure of a Soluble Dimeric Form of Oxidised CLIC1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

The Intracellular Chloride Ion Channel Protein CLIC1 Undergoes a Redox-controlled Structural Transition

Littler, D.R.Harrop, S.J.Fairlie, W.D.Brown, L.J.Pankhurst, G.J.Pankhurst, S.DeMaere, M.Z.Campbell, T.J.Bauskin, A.R.Tonini, R.Mazzanti, M.Breit, S.N.Curmi, P.M.

(2004) J Biol Chem 279: 9298-9305

  • DOI: 10.1074/jbc.M308444200
  • Primary Citation of Related Structures:  
    1RK4

  • PubMed Abstract: 
  • Most proteins adopt a well defined three-dimensional structure; however, it is increasingly recognized that some proteins can exist with at least two stable conformations. Recently, a class of intracellular chloride ion channel proteins (CLICs) has been shown to exist in both soluble and integral membrane forms ...

    Most proteins adopt a well defined three-dimensional structure; however, it is increasingly recognized that some proteins can exist with at least two stable conformations. Recently, a class of intracellular chloride ion channel proteins (CLICs) has been shown to exist in both soluble and integral membrane forms. The structure of the soluble form of CLIC1 is typical of a soluble glutathione S-transferase superfamily protein but contains a glutaredoxin-like active site. In this study we show that on oxidation CLIC1 undergoes a reversible transition from a monomeric to a non-covalent dimeric state due to the formation of an intramolecular disulfide bond (Cys-24-Cys-59). We have determined the crystal structure of this oxidized state and show that a major structural transition has occurred, exposing a large hydrophobic surface, which forms the dimer interface. The oxidized CLIC1 dimer maintains its ability to form chloride ion channels in artificial bilayers and vesicles, whereas a reducing environment prevents the formation of ion channels by CLIC1. Mutational studies show that both Cys-24 and Cys-59 are required for channel activity.


    Organizational Affiliation

    Initiative for Biomolecular Structure, School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
CHLORIDE INTRACELLULAR CHANNEL PROTEIN 1A, B243Homo sapiensMutation(s): 0 
Gene Names: CLIC1NCC27G6
Membrane Entity: Yes 
UniProt & NIH Common Fund Data Resources
Find proteins for O00299 (Homo sapiens)
Explore O00299 
Go to UniProtKB:  O00299
PHAROS:  O00299
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00299
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.79 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.178 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 59.861α = 90
b = 69.189β = 90
c = 107.506γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
AMoREphasing
REFMACrefinement
CCP4data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-02
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance