Karyopherin beta2/transportin

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.262 

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This is version 1.2 of the entry. See complete history


Conformational heterogeneity of karyopherin beta2 is segmental

Cansizoglu, A.E.Chook, Y.M.

(2007) Structure 15: 1431-1441

  • DOI: https://doi.org/10.1016/j.str.2007.09.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Karyopherinbeta2 (Kap beta2) or transportin imports numerous RNA binding proteins into the nucleus. Kap beta2 binds substrates in the cytoplasm and targets them through the nuclear pore complex, where RanGTP dissociates them in the nucleus. Here we report the 3.0 A crystal structure of unliganded Kap beta2, which consists of a superhelix of 20 HEAT repeats. Together with previously reported structures of NLS and Ran complexes, this structure provides understanding of conformational heterogeneity that accompanies ligand binding. The Kap beta2 superhelix is divided into three major segments. Two of them (HEAT repeats 9-13 and 14-18), which constitute the substrate binding site, are rigid elements that rotate relative to each other about a flexible hinge. The third (HEAT repeats 1-8), which constitutes the Ran binding site, exhibits conformational changes throughout its length. An analogous segmental architecture is also observed in Importin beta, suggesting that it is functionally significant and may be conserved in other import karyopherins.

  • Organizational Affiliation

    Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, 6001 Forest Park, Dallas, TX 75390-9041, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C, D
890Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for Q92973 (Homo sapiens)
Explore Q92973 
Go to UniProtKB:  Q92973
GTEx:  ENSG00000083312 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ92973
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.261 
  • R-Value Observed: 0.262 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 129.338α = 90
b = 168.892β = 93.18
c = 140.958γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-10-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-08-30
    Changes: Data collection, Database references, Refinement description