The crystal structure of mouse chloride intracellular channel protein 6

Experimental Data Snapshot

  • Resolution: 1.79 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

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Inherent flexibility of CLIC6 revealed by crystallographic and solution studies.

Ferofontov, A.Strulovich, R.Marom, M.Giladi, M.Haitin, Y.

(2018) Sci Rep 8: 6882-6882

  • DOI: https://doi.org/10.1038/s41598-018-25231-z
  • Primary Citation of Related Structures:  
    6ERY, 6ERZ

  • PubMed Abstract: 

    Chloride intracellular channels (CLICs) are a family of unique proteins, that were suggested to adopt both soluble and membrane-associated forms. Moreover, following this unusual metamorphic change, CLICs were shown to incorporate into membranes and mediate ion conduction in vitro, suggesting multimerization upon membrane insertion. Here, we present a 1.8 Å resolution crystal structure of the CLIC domain of mouse CLIC6 (mCLIC6). The structure reveals a monomeric arrangement and shows a high degree of structural conservation with other CLICs. Small-angle X-ray scattering (SAXS) analysis of mCLIC6 demonstrated that the overall solution structure is similar to the crystallographic conformation. Strikingly, further analysis of the SAXS data using ensemble optimization method unveiled additional elongated conformations, elucidating high structural plasticity as an inherent property of the protein. Moreover, structure-guided perturbation of the inter-domain interface by mutagenesis resulted in a population shift towards elongated conformations of mCLIC6. Additionally, we demonstrate that oxidative conditions induce an increase in mCLIC6 hydrophobicity along with mild oligomerization, which was enhanced by the presence of membrane mimetics. Together, these results provide mechanistic insights into the metamorphic nature of mCLIC6.

  • Organizational Affiliation

    Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, 6997801, Israel.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Chloride intracellular channel protein 6A [auth B],
B [auth A]
238Mus musculusMutation(s): 0 
Gene Names: Clic6
UniProt & NIH Common Fund Data Resources
Find proteins for Q8BHB9 (Mus musculus)
Explore Q8BHB9 
Go to UniProtKB:  Q8BHB9
IMPC:  MGI:2146607
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8BHB9
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.79 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.623α = 90
b = 68.989β = 95.14
c = 80.98γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
XSCALEdata reduction

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2018-05-16
    Type: Initial release
  • Version 1.1: 2024-01-17
    Changes: Data collection, Database references, Refinement description