Importin13 cytosolic state

Experimental Data Snapshot

  • Resolution: 3.00 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.272 
  • R-Value Observed: 0.274 

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This is version 1.1 of the entry. See complete history


Structural Basis for the Nuclear Export Activity of Importin13.

Grunwald, M.Lazzaretti, D.Bono, F.

(2013) EMBO J 32: 899

  • DOI: https://doi.org/10.1038/emboj.2013.29
  • Primary Citation of Related Structures:  
    3ZJY, 3ZKV

  • PubMed Abstract: 

    Importin13 (Imp13) is a bidirectional karyopherin that can mediate both import and export of cargoes. Imp13 recognizes several import cargoes, which include the exon junction complex components Mago-Y14 and the E2 SUMO-conjugating enzyme Ubc9, and one known export cargo, the translation initiation factor 1A (eIF1A). To understand how Imp13 can perform double duty, we determined the 3.6-Å crystal structure of Imp13 in complex with RanGTP and with eIF1A. eIF1A binds at the inner surface of the Imp13 C-terminal arch adjacent and concomitantly to RanGTP illustrating how eIF1A can be exported by Imp13. Moreover, the 3.0-Å structure of Imp13 in its unbound state reveals the existence of an open conformation in the cytoplasm that explains export cargo release and completes the export branch of the Imp13 pathway. Finally, we demonstrate that Imp13 is able to bind and export eIF1A in vivo and that its function is essential.

  • Organizational Affiliation

    Max Planck Institute for Developmental Biology, Tübingen, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CADMUS971Drosophila melanogasterMutation(s): 0 
Find proteins for Q9VEC5 (Drosophila melanogaster)
Explore Q9VEC5 
Go to UniProtKB:  Q9VEC5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9VEC5
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 3.00 Å
  • R-Value Free: 0.311 
  • R-Value Work: 0.272 
  • R-Value Observed: 0.274 
  • Space Group: P 43 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 167.72α = 90
b = 167.72β = 90
c = 95.63γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-10
    Type: Initial release
  • Version 1.1: 2023-12-20
    Changes: Data collection, Database references, Other, Refinement description