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The polybasic region is not essential for membrane binding of the matrix protein M1 of influenza virus

Bastian Thaa1, Andreas Herrmann, Michael Veit

  • 1Department of Immunology and Molecular Biology Veterinary Faculty, Free University Berlin, Philippstr. 13, 10115 Berlin, Germany.

Virology
|November 14, 2008
PubMed

Insights

Influenza virus matrix protein M1 binds to cellular membranes. Researchers engineered M1 to localize outside the nucleus, revealing membrane interactions independent of its proposed polybasic lipid-binding region, suggesting multiple binding sites.

Area of Science:

  • Virology
  • Cell Biology
  • Biochemistry

Background:

  • Influenza virus matrix protein M1 organizes virus assembly and interacts with viral components and cellular membranes.
  • Previous studies suggested M1 binds lipids via its polybasic region, but in vivo investigation was limited by M1 nuclear accumulation in transfected cells.

Purpose of the Study:

  • To investigate the in vivo interaction of influenza virus matrix protein M1 with cellular membranes.
  • To determine the role of the polybasic region in M1 membrane association.

Main Methods:

  • Engineered M1 protein with nuclear export signals to facilitate its localization outside the nucleus.
  • Assessed M1 constructs for binding to cellular membranes.
  • Modified M1 by exchanging the polybasic region and adjacent hydrophobic amino acids.

Main Results:

  • M1 constructs equipped with nuclear export signals successfully associated with cellular membranes.
  • Alterations to the polybasic region and surrounding hydrophobic residues did not disrupt M1 membrane binding.
  • These findings indicate that M1 associates with membranes even after significant modification of the proposed lipid-binding domain.

Conclusions:

  • Influenza virus matrix protein M1 interacts with cellular membranes.
  • M1 membrane association is not solely dependent on its polybasic region.
  • M1 likely utilizes multiple binding sites for membrane interaction, offering a more complex mechanism than previously understood.

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