Crystal structure of influenza A virus M1 N-terminal domain (G18A mutation)

Experimental Data Snapshot

  • Resolution: 1.90 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

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Influenza virus uses transportin 1 for vRNP debundling during cell entry.

Miyake, Y.Keusch, J.J.Decamps, L.Ho-Xuan, H.Iketani, S.Gut, H.Kutay, U.Helenius, A.Yamauchi, Y.

(2019) Nat Microbiol 4: 578-586

  • DOI: https://doi.org/10.1038/s41564-018-0332-2
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Influenza A virus is a pathogen of great medical impact. To develop novel antiviral strategies, it is essential to understand the molecular aspects of virus-host cell interactions in detail. During entry, the viral ribonucleoproteins (vRNPs) that carry the RNA genome must be released from the incoming particle before they can enter the nucleus for replication. The uncoating process is facilitated by histone deacetylase 6 (ref. 1 ). However, the precise mechanism of shell opening and vRNP debundling is unknown. Here, we show that transportin 1, a member of the importin-β family proteins, binds to a PY-NLS 2 sequence motif close to the amino terminus of matrix protein (M1) exposed during acid priming of the viral core. It promotes the removal of M1 and induces disassembly of vRNP bundles. Next, the vRNPs interact with importin-α/β and enter the nucleus. Thus, influenza A virus uses dual importin-βs for distinct steps in host cell entry.

  • Organizational Affiliation

    Institute of Biochemistry, ETH Zurich, Zurich, Switzerland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Matrix protein 1
A, B
177Influenza A virusMutation(s): 1 
Find proteins for P05777 (Influenza A virus (strain A/Wilson-Smith/1933 H1N1))
Explore P05777 
Go to UniProtKB:  P05777
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP05777
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.90 Å
  • R-Value Free: 0.233 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 35.56α = 89.71
b = 35.58β = 84.4
c = 69.29γ = 69.02
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number

Revision History  (Full details and data files)

  • Version 1.0: 2019-09-18
    Type: Initial release