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Updated: Jul 10, 2026

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules
Published on: May 12, 2017
Inhibition of cytoplasmic mRNA stress granule formation by a viral proteinase
James P White1, Ana Maria Cardenas, Wilfred E Marissen
1Department of Molecular Virology and Microbiology, Baylor College of Medicine, Houston, TX 77030, USA.
Abstract:
Mammalian cells form dynamic cytoplasmic mRNA stress granules (SGs) in response to environmental stresses including viral infections. SGs are involved in regulating host mRNA function and metabolism, although their precise role during viral infection is unknown. SGs are thought to assemble based on functions of the RNA-binding proteins TIA-1/TIAR or Ras-GAP SH3 domain-binding protein (G3BP). Here, we investigated the relationship between a prototypical plus-strand RNA virus and SGs. Early during poliovirus infection, SG formation is induced, but as infection proceeds this ability is lost, and SGs disperse. Infection resulted in cleavage of G3BP, but not TIA-1 or TIAR, by poliovirus 3C proteinase. Expression of a cleavage-resistant G3BP restored SG formation during poliovirus infection and significantly inhibited virus replication. These results elucidate a mechanism for viral interference with mRNP metabolism and gene regulation and support a critical role of G3BP in SG formation and restriction of virus replication.
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