3TJ3

Structure of importin a5 bound to the N-terminus of Nup50


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 

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This is version 1.1 of the entry. See complete history


Literature

Nucleoporin Nup50 stabilizes closed conformation of armadillo repeat 10 in importin alpha 5.

Pumroy, R.A.Nardozzi, J.D.Hart, D.J.Root, M.J.Cingolani, G.

(2012) J Biol Chem 287: 2022-2031

  • DOI: 10.1074/jbc.M111.315838
  • Primary Citation of Related Structures:  
    3TJ3

  • PubMed Abstract: 
  • The human genome encodes six isoforms of importin α that show greater than 60% sequence similarity and remarkable substrate specificity. The isoform importin α5 can bind phosphorylated cargos such as STAT1 and Epstein-Barr Virus Nuclear Antigen 1, as ...

    The human genome encodes six isoforms of importin α that show greater than 60% sequence similarity and remarkable substrate specificity. The isoform importin α5 can bind phosphorylated cargos such as STAT1 and Epstein-Barr Virus Nuclear Antigen 1, as well as the influenza virus polymerase subunit PB2. In this work, we have studied the interaction of the nucleoporin Nup50 with importin α5. We show that the first 47 residues of Nup50 bind to the C terminus of importin α5 like a "clip," stabilizing the closed conformation of ARM 10. In vitro, Nup50 binds with high affinity either to empty importin α5 or to a preassembled complex of importin α5 bound to the C-terminal domain of the import cargo PB2, resulting in a trimeric complex. By contrast, PB2 can only bind with high affinity to importin α5 in the absence of Nup50. This suggests that Nup50 primary function may not be to actively displace the import cargo from importin α5 but rather to prevent cargo rebinding in preparation for recycling. This is the first evidence for a nucleoporin modulating the import reaction by directly altering the three-dimensional structure of an import adaptor.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, Philadelphia, Pennsylvania 19107, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Importin subunit alpha-1AB447Homo sapiensMutation(s): 0 
Gene Names: KPNA1RCH2
Find proteins for P52294 (Homo sapiens)
Explore P52294 
Go to UniProtKB:  P52294
NIH Common Fund Data Resources
PHAROS  P52294
Protein Feature View
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  • Reference Sequence
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nuclear pore complex protein Nup50CD114Homo sapiensMutation(s): 0 
Gene Names: NUP50NPAP60LPRO1146
Find proteins for Q9UKX7 (Homo sapiens)
Explore Q9UKX7 
Go to UniProtKB:  Q9UKX7
NIH Common Fund Data Resources
PHAROS  Q9UKX7
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.255 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 81.683α = 90
b = 98.291β = 90
c = 135.352γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-11-30
    Type: Initial release
  • Version 1.1: 2015-02-11
    Changes: Database references