7JM3

Full-length three-dimensional structure of the influenza A virus M1 protein and its organization into a matrix layer


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Full-length three-dimensional structure of the influenza A virus M1 protein and its organization into a matrix layer.

Selzer, L.Su, Z.Pintilie, G.D.Chiu, W.Kirkegaard, K.

(2020) PLoS Biol 18: e3000827-e3000827

  • DOI: https://doi.org/10.1371/journal.pbio.3000827
  • Primary Citation of Related Structures:  
    7JM3

  • PubMed Abstract: 

    Matrix proteins are encoded by many enveloped viruses, including influenza viruses, herpes viruses, and coronaviruses. Underneath the viral envelope of influenza virus, matrix protein 1 (M1) forms an oligomeric layer critical for particle stability and pH-dependent RNA genome release. However, high-resolution structures of full-length monomeric M1 and the matrix layer have not been available, impeding antiviral targeting and understanding of the pH-dependent transitions involved in cell entry. Here, purification and extensive mutagenesis revealed protein-protein interfaces required for the formation of multilayered helical M1 oligomers similar to those observed in virions exposed to the low pH of cell entry. However, single-layered helical oligomers with biochemical and ultrastructural similarity to those found in infectious virions before cell entry were observed upon mutation of a single amino acid. The highly ordered structure of the single-layered oligomers and their likeness to the matrix layer of intact virions prompted structural analysis by cryo-electron microscopy (cryo-EM). The resulting 3.4-Å-resolution structure revealed the molecular details of M1 folding and its organization within the single-shelled matrix. The solution of the full-length M1 structure, the identification of critical assembly interfaces, and the development of M1 assembly assays with purified proteins are crucial advances for antiviral targeting of influenza viruses.


  • Organizational Affiliation

    Departments of Genetics Stanford University School of Medicine, Stanford, California, United States of America.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Matrix protein 1A [auth C]251Influenza A virus (A/Puerto Rico/8/1934(H1N1))Mutation(s): 1 
Gene Names: M1M
UniProt
Find proteins for P03485 (Influenza A virus (strain A/Puerto Rico/8/1934 H1N1))
Explore P03485 
Go to UniProtKB:  P03485
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP03485
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: FILAMENT 
  • Reconstruction Method: HELICAL 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.17
RECONSTRUCTIONRELION3.0.6

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Library of Medicine (NIH/NLM)United StatesP41GM103832
National Institutes of Health/National Library of Medicine (NIH/NLM)United StatesS10OD021600
National Institutes of Health/National Library of Medicine (NIH/NLM)United StatesP30 CA124435

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-12
    Type: Initial release
  • Version 1.1: 2020-10-14
    Changes: Database references
  • Version 1.2: 2024-03-06
    Changes: Data collection, Database references, Derived calculations, Refinement description