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Interactions of rice tungro bacilliform pararetrovirus and its protein P4 with plant RNA silencing machinery

Rajeswaran, Rajendran and Golyaev, Victor and Seguin, Jonathan and Zvereva, Anna S. and Farinelli, Laurent and Pooggin, Mikhail M.. (2014) Interactions of rice tungro bacilliform pararetrovirus and its protein P4 with plant RNA silencing machinery. Molecular plant-microbe interactions, Vol. 27, H. 12. S. 1370-1378.

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Official URL: http://edoc.unibas.ch/dok/A6289133

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Abstract

Small interfering RNA (siRNA)-directed gene silencing plays a major role in antiviral defense. Virus-derived siRNAs inhibit viral replication in infected cells and potentially move to neighboring cells, immunizing them from incoming virus. Viruses have evolved various ways to evade and suppress siRNA production or action. Here we show that 21-, 22- and 24-nucleotide (nt) viral siRNAs together constitute up to 19% of total small RNA population of Oryza sativa plants infected with Rice tungro bacilliform virus (RTBV) and cover both strands of the RTBV DNA genome. However, viral siRNA hotspots are restricted to a short non-coding region between transcription and reverse transcription start sites. This region generates double-stranded RNA (dsRNA) precursor of siRNAs and, in pregenomic RNA, forms a stable secondary structure likely inaccessible to siRNA-directed cleavage. In transient assays, RTBV protein P4 suppressed cell-to-cell spread of silencing but enhanced cell-autonomous silencing, which correlated with reduced 21-nt siRNA levels and increased 22-nt siRNA levels. Our findings imply that RTBV generates decoy dsRNA that restricts siRNA production to the structured non-coding region and thereby protects other regions of the viral genome from repressive action of siRNAs, while the viral protein P4 interferes with cell-to-cell spread of antiviral silencing.
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Botanisches Institut > Pflanzenphysiologie Pathogenabwehr (Boller)
05 Faculty of Science > Departement Umweltwissenschaften > Ehemalige Einheiten Umweltwissenschaften > Molekulare Pflanzenvirologie (Hohn)
UniBasel Contributors:Pooggin, Mikhail and Zvereva, Anna and Rajeswaran, Rajendran and Golyaev, Victor and Seguin, Jonathan
Item Type:Article, refereed
Bibsysno:Link to catalogue
Publisher:APS Press
ISSN:0894-0282
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:10 Apr 2015 09:12
Deposited On:06 Feb 2015 09:58

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