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Tomato geminivirus encoded RNAi suppressor protein, AC4 interacts with host AGO4 and precludes viral DNA methylation

AutorVinutha, T.; Gaurav, Kumar; Garg, V.; Canto, Tomás ; Palukaitis, Peter; Ramesh, S. V.; Praveen, Shelly
Palabras claveDNA methylation
RNA-dependent DNA methylation (RdDM)
RNA silencing
Tomato leaf curl New Delhi virus (ToLCNDV)
Transcriptional gene silencing
Viral suppressor of RNA silencing (VSR)
Fecha de publicación3-ago-2018
EditorElsevier
CitaciónGene 18:30866-7 (2018)
ResumenPlant RNA silencing systems are organized as a network, regulating plant developmental pathways and restraining invading viruses, by sharing cellular components with overlapping functions. Host regulatory networks operate either at the transcriptional level via RNA-directed DNA methylation, or at the post-transcriptional stage interfering with mRNA to restrict viral infection. However, viral-derived proteins, including suppressors of RNA silencing, favour virus establishment, and also affect plant developmental processes. In this investigation, we report that Tomato leaf curl New Delhi virus-derived AC4 protein suppresses RNA silencing activity and mutational analysis of AC4 showed that Asn-50 in the SKNT-51 motif, in the C-terminal region, is a critical determinant of its RNA silencing suppressor activity. AC4 showed interaction with host AGO4 but not with AGO1, aggregated around the nucleus and influenced cytosine methylation of the viral genome. The possible molecular mechanism by which AC4 interferes in the RNA silencing network, helps virus establishment, and affects plant development is discussed.
Descripción44 p.-4 fig.-1 tab.
Versión del editorhttps://doi.org/10.1016/j.gene.2018.08.009
URIhttp://hdl.handle.net/10261/168439
DOI10.1016/j.gene.2018.08.009
ISSN0378-1119
E-ISSN1879-0038
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