2QMR

Karyopherin beta2/transportin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.261 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Conformational heterogeneity of karyopherin beta2 is segmental

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

(2007) Structure 15: 1431-1441

  • DOI: 10.1016/j.str.2007.09.009

  • 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 r ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transportin-1
A, B, C, D
890Homo sapiensMutation(s): 0 
Gene Names: TNPO1 (KPNB2, MIP1, TRN)
Find proteins for Q92973 (Homo sapiens)
Go to Gene View: TNPO1
Go to UniProtKB:  Q92973
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.286 
  • R-Value Work: 0.261 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 129.338α = 90.00
b = 168.892β = 93.18
c = 140.958γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data scaling
PHASERphasing
SBC-Collectdata collection
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-10-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance