Structure of Yeast Importin-beta (Kap95p)

Experimental Data Snapshot

  • Resolution: 2.40 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 

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Quantitative Structural Analysis of Importin-beta Flexibility: Paradigm for Solenoid Protein Structures

Forwood, J.K.Lange, A.Zachariae, U.Marfori, M.Preast, C.Grubmuller, H.Stewart, M.Corbett, A.H.Kobe, B.

(2010) Structure 18: 1171-1183

  • DOI: https://doi.org/10.1016/j.str.2010.06.015
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The structure of solenoid proteins facilitates a higher degree of flexibility than most folded proteins. In importin-β, a nuclear import factor built from 19 tandem HEAT repeats, flexibility plays a crucial role in allowing interactions with a range of different partners. We present a comprehensive analysis of importin-β flexibility based on a number of different approaches. We determined the crystal structure of unliganded Saccharomyces cerevisiae importin-β (Kap95) to allow a quantitative comparison with importin-β bound to different partners. Complementary mutagenesis, small angle X-ray scattering and molecular dynamics studies suggest that the protein samples several conformations in solution. The analyses suggest the flexibility of the solenoid is generated by cumulative small movements along its length. Importin-β illustrates how solenoid proteins can orchestrate protein interactions in many cellular pathways.

  • Organizational Affiliation

    School of Biomedical Sciences, Charles Sturt University, Wagga Wagga, New South Wales 2650, Australia. jforwood@csu.edu.au

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit beta-1861Saccharomyces cerevisiaeMutation(s): 0 
Find proteins for Q06142 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q06142 
Go to UniProtKB:  Q06142
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ06142
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.40 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.215 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 58.835α = 90
b = 128.272β = 102.68
c = 69.05γ = 90
Software Package:
Software NamePurpose
CrystalCleardata collection
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-11-01
    Changes: Data collection, Database references, Refinement description