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Challenging the Roles of NSP3 and Untranslated Regions in Rotavirus mRNA Translation.

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Gratia, Matthieu | Vende, Patrice | Charpilienne, Annie | Baron, Hilma Carolina | Laroche, Cécile | Sarot, Emeline | Pyronnet, Stéphane | Duarte, Mariela | Poncet, Didier

Edité par CCSD ; Public Library of Science -

International audience. Rotavirus NSP3 is a translational surrogate of the PABP-poly(A) complex for rotavirus mRNAs. To further explore the effects of NSP3 and untranslated regions (UTRs) on rotavirus mRNAs translation, we used a quantitative in vivo assay with simultaneous cytoplasmic NSP3 expression (wild-type or deletion mutant) and electroporated rotavirus-like and standard synthetic mRNAs. This assay shows that the last four GACC nucleotides of viral mRNA are essential for efficient translation and that both the NSP3 eIF4G- and RNA-binding domains are required. We also show efficient translation of rotavirus-like mRNAs even with a 5'UTR as short as 5 nucleotides, while more than eleven nucleotides are required for the 3'UTR. Despite the weak requirement for a long 5'UTR, a good AUG environment remains a requirement for rotavirus mRNAs translation.

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