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Co-immunoprecipitation of the Mouse Mx1 Protein with the Influenza A Virus Nucleoprotein
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Membrane interaction of influenza virus M1 protein

R W Ruigrok1, A Barge, P Durrer

  • 1EMBL Grenoble Outstation, Grenoble Cedex 9, 38042, France. ruigrok@embl-grenoble.fr

Virology
|February 9, 2000
PubMed

Insights

Influenza virus M1 protein primarily associates with the viral membrane via electrostatic interactions, not deep membrane insertion. This finding clarifies the M1 protein's role in viral structure and assembly.

Area of Science:

  • Virology
  • Structural Biology
  • Biochemistry

Background:

  • The M1 protein of influenza virus is hypothesized to interact with viral membrane components and internal ribonucleoprotein particles.
  • Understanding M1 protein's interaction with the viral membrane is crucial for elucidating influenza virus assembly and structure.

Purpose of the Study:

  • To investigate the precise localization and membrane interaction of the influenza virus M1 protein.
  • To determine whether M1 protein is embedded within the viral membrane or associated with its surface.

Main Methods:

  • Electron microscopy of negatively stained influenza virus particles to visualize M1 protein structure.
  • Photolabeling experiments using a membrane-restricted reagent to assess M1 protein's membrane insertion.
  • In vitro reconstitution assays with liposomes and cell membranes to study M1 protein binding.

Main Results:

  • Electron microscopy revealed M1 protein as a rod-like structure associated with the viral membrane surface, not inserted into it.
  • Photolabeling experiments did not label M1 protein, indicating it is not embedded in the hydrophobic core of the membrane.
  • In vitro studies showed M1 protein binds to negatively charged liposomes and cell membranes through electrostatic interactions, which are disrupted by high salt concentrations.

Conclusions:

  • The majority of influenza virus M1 protein is associated with the viral membrane via electrostatic interactions, rather than being inserted into the lipid bilayer.
  • These findings refine our understanding of the M1 protein's role in viral structure and assembly.

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