2R4V

Structure of human CLIC2, crystal form A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 

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This is version 1.2 of the entry. See complete history


Literature

Structure of the Janus Protein Human CLIC2

Cromer, B.A.Gorman, M.A.Hansen, G.Adams, J.J.Coggan, M.Littler, D.R.Brown, L.J.Mazzanti, M.Breit, S.N.Curmi, P.M.G.Dulhunty, A.F.Board, P.G.Parker, M.W.

(2007) J Mol Biol 374: 719-731

  • DOI: 10.1016/j.jmb.2007.09.041
  • Primary Citation of Related Structures:  
    2R5G, 2R4V

  • PubMed Abstract: 
  • Chloride intracellular channel (CLIC) proteins possess the remarkable property of being able to convert from a water-soluble state to a membrane channel state. We determined the three-dimensional structure of human CLIC2 in its water-soluble form by X-ray crystallography at 1 ...

    Chloride intracellular channel (CLIC) proteins possess the remarkable property of being able to convert from a water-soluble state to a membrane channel state. We determined the three-dimensional structure of human CLIC2 in its water-soluble form by X-ray crystallography at 1.8-A resolution from two crystal forms. In contrast to the previously characterized CLIC1 protein, which forms a possibly functionally important disulfide-induced dimer under oxidizing conditions, we show that CLIC2 possesses an intramolecular disulfide and that the protein remains monomeric irrespective of redox conditions. Site-directed mutagenesis studies show that removal of the intramolecular disulfide or introduction of cysteine residues in CLIC2, equivalent to those that form the intramolecular disulfide in CLIC1, does not cause dimer formation under oxidizing conditions. We also show that CLIC2 forms pH-dependent chloride channels in vitro with higher channel activity at low pH levels and that the channels are subject to redox regulation. In both crystal forms, we observed an extended loop region from the C-terminal domain, called the foot loop, inserting itself into an interdomain crevice of a neighboring molecule. The equivalent region in the structurally related glutathione transferase superfamily corresponds to the active site. This so-called foot-in-mouth interaction suggests that CLIC2 might recognize other proteins such as the ryanodine receptor through a similar interaction.


    Organizational Affiliation

    Biota Structural Biology Laboratory, St. Vincent's Institute, Fitzroy, Victoria 3065, Australia.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chloride intracellular channel protein 2A247Homo sapiensMutation(s): 0 
Gene Names: CLIC2
UniProt & NIH Common Fund Data Resources
Find proteins for O15247 (Homo sapiens)
Explore O15247 
Go to UniProtKB:  O15247
PHAROS:  O15247
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GSH (Subject of Investigation/LOI)
Query on GSH

Download Ideal Coordinates CCD File 
B [auth A], C [auth A]GLUTATHIONE
C10 H17 N3 O6 S
RWSXRVCMGQZWBV-WDSKDSINSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.85 Å
  • R-Value Free: 0.250 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 44.015α = 90
b = 74.722β = 90
c = 79.827γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

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Ligand Structure Quality Assessment  



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-11-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.2: 2011-12-21
    Changes: Non-polymer description