The polypyrimidine tract binding protein is required for efficient picornavirus gene expression and propagation

Paola M. Florez, October M. Sessions, Eric Wagner, Matthias Gromeier, Mariano Garcia-Blanco

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

Mammalian host factors required for efficient viral gene expression and propagation have been often recalcitrant to genetic analysis. A case in point is the function of cellular factors that irons-activate internal ribosomal entry site (IRES)-driven translation, which is operative in many positive-stranded RNA viruses, including all picornaviruses. These IRES trans-acting factors have been elegantly studied in vitro, but their in vivo importance for viral gene expression and propagation has not been widely confirmed experimentally. Here we use RNA interference to deplete mammalian cells of one such factor, the polypyrimidine tract binding protein, and test its requirement in picornavirus gene expression and propagation. Depletion of the polypyrimidine tract binding protein resulted in a marked delay of particle propagation and significantly decreased synthesis and accumulation of viral proteins of poliovirus and encephalomyocarditis virus. These effects could be partially restored by expression of an RNA interference-resistant exogenous polypyrimidine tract binding protein. These data indicate a critical role for the polypyrimidine tract binding protein in picornavirus gene expression and strongly suggest a requirement for efficient IRES-dependent translation.

Original languageEnglish (US)
Pages (from-to)6172-6179
Number of pages8
JournalJournal of Virology
Volume79
Issue number10
DOIs
StatePublished - May 2005
Externally publishedYes

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Polypyrimidine Tract-Binding Protein
Picornaviridae
binding proteins
Gene Expression
gene expression
Viral Genes
RNA Interference
RNA interference
translation (genetics)
Encephalomyocarditis virus
Enterovirus C
Trans-Activators
Poliovirus
RNA Viruses
viral proteins
Viral Proteins
genetic techniques and protocols
iron
synthesis
testing

ASJC Scopus subject areas

  • Immunology

Cite this

The polypyrimidine tract binding protein is required for efficient picornavirus gene expression and propagation. / Florez, Paola M.; Sessions, October M.; Wagner, Eric; Gromeier, Matthias; Garcia-Blanco, Mariano.

In: Journal of Virology, Vol. 79, No. 10, 05.2005, p. 6172-6179.

Research output: Contribution to journalArticle

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