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Patchwork structure-function analysis of the Sendai virus matrix protein

Geneviève Mottet-Osman1, Vincent Miazza1, Pierre-Olivier Vidalain2

  • 1Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland.

Virology
|August 13, 2014
PubMed

Insights

Matrix proteins (M) are crucial for paramyxovirus assembly. Disrupting M

Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Paramyxoviruses possess a lipid envelope with transmembrane glycoproteins and an inner matrix protein (M) layer.
  • Matrix proteins are hypothesized to link viral glycoproteins to nucleocapsids.

Purpose of the Study:

  • To investigate the structure-function relationships of paramyxovirus matrix proteins (M).
  • To determine the specific roles of M domains in viral assembly and infection.

Main Methods:

  • Site-directed mutagenesis and domain deletion of M genes.
  • Generation of recombinant Sendai viruses expressing modified M proteins.
  • Integrated suppression complementation system (ISCS) for functional analysis during infection.

Main Results:

  • Mutations affected M's association with cellular membranes and localization to the cell periphery.
  • Nucleocapsid binding by M was impaired in specific mutants.
  • Impaired nucleocapsid binding correlated with reduced cell surface localization and overall viral particle production.

Conclusions:

  • M protein's nucleocapsid binding is essential for its cell surface localization.
  • Both nucleocapsid binding and cell surface localization are critical for M's overall function in viral particle formation.
  • These findings elucidate key M structure-function requirements for paramyxovirus replication.
Keywords:
Integrated suppression complementation systemMatrix proteinParamyxovirus assemblySendai virusStructure-function

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