An Isoform of the Eukaryotic Translation Elongation Factor 1A (eEF1a) Acts as a Pro-Viral Factor Required for Tomato Spotted Wilt Virus Disease in Nicotiana benthamiana

Tieme A. Helderman, Laurens Deurhof, André Bertran, Sjef Boeren, Like Fokkens, Richard Kormelink, Matthieu H.A.J. Joosten, Marcel Prins, Harrold A. van den Burg*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The tripartite genome of the negative-stranded RNA virus Tomato spotted wilt orthotospovirus (TSWV) is assembled, together with two viral proteins, the nucleocapsid protein and the RNA-dependent RNA polymerase, into infectious ribonucleoprotein complexes (RNPs). These two viral proteins are, together, essential for viral replication and transcription, yet our knowledge on the host factors supporting these two processes remains limited. To fill this knowledge gap, the protein composition of viral RNPs collected from TSWV-infected Nicotiana benthamiana plants, and of those collected from a reconstituted TSWV replicon system in the yeast Saccharomyces cerevisiae, was analysed. RNPs obtained from infected plant material were enriched for plant proteins implicated in (i) sugar and phosphate transport and (ii) responses to cellular stress. In contrast, the yeast-derived viral RNPs primarily contained proteins implicated in RNA processing and ribosome biogenesis. The latter suggests that, in yeast, the translational machinery is recruited to these viral RNPs. To examine whether one of these cellular proteins is important for a TSWV infection, the corresponding N. benthamiana genes were targeted for virus-induced gene silencing, and these plants were subsequently challenged with TSWV. This approach revealed four host factors that are important for systemic spread of TSWV and disease symptom development.
Original languageEnglish
Article number2190
JournalViruses
Volume13
Issue number11
DOIs
Publication statusPublished - 30 Oct 2021

Keywords

  • Eukaryotic translation elongation factor 1A (eEF1A)
  • Host factor
  • NanoLC-MS/MS
  • Pro-viral factor
  • Ribonucleoproteins (RNP)
  • SDS-PAGE-based proteomics
  • Susceptibility factor
  • Tomato spotted wilt orthotospovirus (TSWV)

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