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Title

A Sendai virus vector leading to the efficient expression of mutant M proteins interfering with virus particle budding

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Published in Virology. 1996, vol. 221, no. 1, p. 159-171
Abstract A Sendai virus expression vector in the form of a transcribing copy-back defective interfering RNA was constructed and shown to efficiently express a tagged matrix protein in the only context of a Sendai virus infection. In an attempt to identify relevant M protein domains involved in viral assembly and budding, a series of deletion mutants were tested for their ability to bind to cellular membrane fractions. The deletion of a region spanning amino acids 105-137 significantly decreased this binding when the protein was expressed in a system driven by the T7 RNA polymerase away from any other viral proteins. Plus or minus charges were introduced in the hydrophobic portion of a predicted amphiphilic helix in this region, and M proteins with altered membrane binding properties were produced. The genes encoding these mutant M proteins were then inserted in the Sendai virus vector and shown to be expressed at levels similar to that of the endogenous wild-type M protein. The presence of a negative charge in the hydrophobic region of the putative amphiphilic helix prevented the incorporation of the mutant protein into virus particles and appeared to decrease the efficiency of virus particle budding. In contrast, the introduction of a positive charge appeared to increase the M mutant uptake into virions. The use a Sendai virus vector has therefore been shown instrumental in the identification of mutant M proteins interfering with the viral assembly-budding process.
Keywords AnimalsBase SequenceCell LineCell Membrane/metabolismCloningMolecularConserved SequenceCricetinaeDNAViralGenetic Vectors/geneticsHeLa CellsHumansMolecular Sequence DataParainfluenza Virus 1Human/genetics/physiologyPoint MutationRabbitsSequence DeletionViral Matrix Proteins/genetics/physiologyVirus Assembly/physiology
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PMID: 8661424
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Research group Identification des facteurs clés impliqués dans la pathogénèse des rhinovirus et entérovirus (953)
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MOTTET-OSMAN, Geneviève et al. A Sendai virus vector leading to the efficient expression of mutant M proteins interfering with virus particle budding. In: Virology, 1996, vol. 221, n° 1, p. 159-171. doi: 10.1006/viro.1996.0362 https://archive-ouverte.unige.ch/unige:139732

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