3OQS

Crystal structure of importin-alpha bound to a CLIC4 NLS peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Crystal structure of importin-alpha bound to a peptide bearing the nuclear localisation signal from chloride intracellular channel protein 4

Mynott, A.V.Harrop, S.J.Brown, L.J.Breit, S.N.Kobe, B.Curmi, P.M.G.

(2011) Febs J. 278: 1662-1675

  • DOI: 10.1111/j.1742-4658.2011.08086.x

  • PubMed Abstract: 
  • It has been reported that a human chloride intracellular channel (CLIC) protein, CLIC4, translocates to the nucleus in response to cellular stress, facilitated by a putative CLIC4 nuclear localization signal (NLS). The CLIC4 NLS adopts an α-helical s ...

    It has been reported that a human chloride intracellular channel (CLIC) protein, CLIC4, translocates to the nucleus in response to cellular stress, facilitated by a putative CLIC4 nuclear localization signal (NLS). The CLIC4 NLS adopts an α-helical structure in the native CLIC4 fold. It is proposed that CLIC4 is transported to the nucleus via the classical nuclear import pathway after binding the import receptor, importin-α. In this study, we have determined the X-ray crystal structure of a truncated form of importin-α lacking the importin-β binding domain, bound to a CLIC4 NLS peptide. The NLS peptide binds to the major binding site in an extended conformation similar to that observed for the classical simian virus 40 large T-antigen NLS. A Tyr residue within the CLIC4 NLS makes surprisingly favourable interactions by forming side-chain hydrogen bonds to the importin-α backbone. This structural evidence supports the hypothesis that CLIC4 translocation to the nucleus is governed by the importin-α nuclear import pathway, provided that CLIC4 can undergo a conformational rearrangement that exposes the NLS in an extended conformation.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
peptide of Chloride intracellular channel protein 4
B
10Homo sapiensMutation(s): 0 
Gene Names: CLIC4
Find proteins for Q9Y696 (Homo sapiens)
Go to Gene View: CLIC4
Go to UniProtKB:  Q9Y696
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha-2
A
510Mus musculusMutation(s): 0 
Gene Names: Kpna2 (Rch1)
Find proteins for P52293 (Mus musculus)
Go to UniProtKB:  P52293
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.237 
  • R-Value Work: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 78.594α = 90.00
b = 89.558β = 90.00
c = 100.083γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
PDB_EXTRACTdata extraction
SCALAdata scaling
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-07-27
    Type: Initial release