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Interaction of influenza A virus matrix protein with RACK1 is required for virus release

Dimiter Demirov1, Gülsah Gabriel, Carola Schneider

  • 1Institute of Molecular Virology (IMV), Centre for Molecular Biology of Inflammation (ZMBE), University of Münster, 48149 Münster, Germany.

Cellular Microbiology
|February 1, 2012
PubMed

Insights

Influenza A virus release is hindered when a specific proline in matrix protein M1 is mutated, disrupting its interaction with RACK1. This highlights M1

Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • The budding and release mechanisms of negative-strand RNA viruses, including influenza A virus, are not fully understood.
  • Influenza A virus budding deviates from established models seen in retroviruses.
  • The matrix protein M1 is crucial for influenza virus assembly and release.

Purpose of the Study:

  • To investigate the role of the influenza A virus matrix protein M1 in the final stages of virus release.
  • To elucidate the specific molecular interactions involving M1 that facilitate virus detachment from host cells.

Main Methods:

  • Site-directed mutagenesis of the influenza A virus matrix protein M1 at proline residue 16.
  • Depletion of the M1-binding protein RACK1 using molecular techniques.
  • Analysis of virus release and particle detachment from infected cells.
  • Investigation of M1 and RACK1 interactions at the plasma membrane and detergent-resistant membranes.

Main Results:

  • A mutation at proline 16 of matrix protein M1 significantly inhibits influenza A virus detachment from cells.
  • Depletion of RACK1, a protein that binds M1, also impairs virus release.
  • RACK1 binding to M1 is dependent on proline 16.
  • The M1-RACK1 interaction is essential for the 'pinching-off' of budding virus particles, not for M1's initial plasma membrane binding.
  • RACK1 recruitment to detergent-resistant membranes requires M1 with an intact proline 16.

Conclusions:

  • The influenza A virus matrix protein M1 plays an active, essential role in virus particle release.
  • A specific proline residue (P16) in M1 is critical for mediating the interaction with RACK1.
  • This M1-RACK1 interaction, involving RACK1 recruitment to detergent-resistant membranes, is vital for the final detachment of progeny viruses.
  • These findings reveal a novel pathway involving M1 and RACK1 that regulates influenza A virus release.

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