4UAE

Importin alpha 3 delta IBB in complex with Influenza PB2 Nuclear Localization Domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.2 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: 10.1016/j.str.2014.11.015
  • Primary Citation of Related Structures:  

  • 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 specif ...

    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

    Department of Biochemistry and Molecular Biology, Thomas Jefferson University, 233 South 10th Street, Philadelphia, PA 19107, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Importin subunit alpha-3
A
421Homo sapiensMutation(s): 0 
Gene Names: KPNA4 (QIP1)
Find proteins for O00629 (Homo sapiens)
Go to Gene View: KPNA4
Go to UniProtKB:  O00629
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Polymerase basic protein 2
F
87Influenza A virus (strain A/Victoria/3/1975 H3N2)Mutation(s): 0 
Gene Names: PB2
Find proteins for P31345 (Influenza A virus (strain A/Victoria/3/1975 H3N2))
Go to UniProtKB:  P31345
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.185 
  • Space Group: P 41
Unit Cell:
Length (Å)Angle (°)
a = 135.682α = 90.00
b = 135.682β = 90.00
c = 47.309γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM074846
National Institutes of Health/National Institute of General Medical SciencesUnited StatesGM100888

Revision History 

  • Version 1.0: 2015-02-04
    Type: Initial release
  • Version 1.1: 2015-02-11
    Type: Database references
  • Version 1.2: 2017-09-20
    Type: Author supporting evidence, Database references, Derived calculations, Other, Source and taxonomy, Structure summary