Inhibition of pyrimidine synthesis reverses viral virulence factor-mediated block of mRNA nuclear export

Liang Zhang, Priyabrata Das, Mirco Schmolke, Balaji Manicassamy, Yaming Wang, Xiaoyi Deng, Ling Cai, Benjamin P. Tu, Christian V. Forst, Michael G. Roth, David E. Levy, Adolfo García-Sastre, Jef de Brabander, Margaret A. Phillips, Beatriz M A Fontoura

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29 Scopus citations

Abstract

The NS1 protein of influenza virus is a major virulence factor essential for virus replication, as it redirects the host cell to promote viral protein expression. NS1 inhibits cellular messenger ribonucleic acid (mRNA) processing and export, down-regulating host gene expression and enhancing viral gene expression. We report in this paper the identification of a nontoxic quinoline carboxylic acid that reverts the inhibition of mRNA nuclear export by NS1, in the absence or presence of the virus. This quinoline carboxylic acid directly inhibited dihydroorotate dehydrogenase (DHODH), a host enzyme required for de novo pyrimidine biosynthesis, and partially reduced pyrimidine levels. This effect induced NXF1 expression, which promoted mRNA nuclear export in the presence of NS1. The release of NS1-mediated mRNA export block by DHODH inhibition also occurred in the presence of vesicular stomatitis virus M (matrix) protein, another viral inhibitor of mRNA export. This reversal of mRNA export block allowed expression of antiviral factors. Thus, pyrimidines play a necessary role in the inhibition of mRNA nuclear export by virulence factors.

Original languageEnglish (US)
Pages (from-to)315-326
Number of pages12
JournalJournal of Cell Biology
Volume196
Issue number3
DOIs
Publication statusPublished - Feb 6 2012

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ASJC Scopus subject areas

  • Cell Biology
  • Medicine(all)

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