4UAD

Importin alpha 7 delta IBB in complex with Influenza PB2 Nuclear Localization Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.42 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.193 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Molecular Determinants for Nuclear Import of Influenza A PB2 by Importin alpha Isoforms 3 and 7.

Pumroy, R.A.Ke, S.Hart, D.J.Zachariae, U.Cingolani, G.

(2015) Structure 23: 374-384

  • DOI: https://doi.org/10.1016/j.str.2014.11.015
  • Primary Citation of Related Structures:  
    4UAD, 4UAE, 4UAF

  • PubMed Abstract: 

    Influenza A virus polymerase subunit PB2 is a major virulence determinant implicated in pathogenicity and host adaptation. During cross-species virus transfer from avian to mammalian cells, PB2 switches specificity from importin α3 to α7. This specificity is not recapitulated in vitro, where PB2 binds all importin α isoforms with comparably high affinity. In this study, we investigated the structure, conformational dynamics, and autoinhibition of importin α isoforms 1, 3, and 7 in complex with PB2. Our data suggest that association of PB2 with α3 and α7 is favored by reduced autoinhibition of these isoforms and by the unique structure of the nuclear localization signal (NLS) domain of PB2. We propose that by recruiting importin α3 or α7 in the absence of importin β, PB2 reduces the complexity of adaptor-mediated import to a pseudo-bimolecular reaction, thereby acquiring a kinetic advantage over classical NLS cargos, which form an import complex only when importin α and β are simultaneously available.


  • Organizational Affiliation

    Division of Physics, School of Engineering, Mathematics and Physics, University of Dundee, Dundee DD1 4NH, UK; Department of Pharmacology and Toxicology, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Importin subunit alpha-7479Homo sapiensMutation(s): 0 
Gene Names: KPNA6IPOA7
UniProt & NIH Common Fund Data Resources
Find proteins for O60684 (Homo sapiens)
Explore O60684 
Go to UniProtKB:  O60684
PHAROS:  O60684
GTEx:  ENSG00000025800 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO60684
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Polymerase basic protein 2B [auth E]77Influenza A virus (A/Victoria/3/1975(H3N2))Mutation(s): 0 
Gene Names: PB2
UniProt
Find proteins for P31345 (Influenza A virus (strain A/Victoria/3/1975 H3N2))
Explore P31345 
Go to UniProtKB:  P31345
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP31345
Sequence Annotations
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.42 Å
  • R-Value Free: 0.231 
  • R-Value Work: 0.189 
  • R-Value Observed: 0.193 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 242.315α = 90
b = 38.836β = 98.03
c = 67.898γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM074846
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesGM100888

Revision History  (Full details and data files)

  • Version 1.0: 2015-02-04
    Type: Initial release
  • Version 1.1: 2015-02-11
    Changes: Database references
  • Version 1.2: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations, Other, Source and taxonomy
  • Version 1.3: 2019-12-25
    Changes: Author supporting evidence
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Refinement description