Suppressor of RNA silencing encoded by the monopartite tomato leaf curl Java begomovirus.

Abstract:

:We previously isolated the monopartite begomovirus tomato leaf curl Java virus (ToLCJAV) and satellite DNAbeta02 from the same naturally infected tomato source in Indonesia. ToLCJAV induced mild leaf curl symptoms in Nicotiana benthamiana plants; DNAbeta02 encoded the betaC1 gene and produced severe leaf curl symptoms when co-inoculated with ToLCJAV in N. benthamiana. However, DNAbeta02mbetaC1, which contains a frame shift mutation, did not induce severe symptoms in N. benthamiana when co-inoculated with ToLCJAV. Expression of the betaC1 gene in N. benthamiana using a potato virus X (PVX) vector induced virus-like symptoms in the absence of ToLCJAV infection. When betaC1 and green fluorescent protein (GFP) genes were co-expressed in the GFP-expressing N. benthamiana line 16c from a PVX vector, betaC1 was able to suppress posttranscriptional gene silencing (PTGS) induced by GFP and eliminated the short interfering RNA (siRNA) associated with GFP expression, with a correlated increase in GFP mRNA accumulation. When C2 or C4 genes of ToLCJAV and the GFP gene were co-expressed in the GFP-expressing N. benthamiana line 16c, C2 showed a weak suppressor activity and C4 was unable to suppress PTGS induced by GFP, and siRNA associated with GFP was detected. The results of the sub-cellular localization of ToLCJAV-betaC1 in the epidermal cells of N. benthamiana and onion tissues showed that this protein is accumulated towards the periphery of the cell.

journal_name

Arch Virol

journal_title

Archives of virology

authors

Kon T,Sharma P,Ikegami M

doi

10.1007/s00705-007-0957-6

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

1273-82

issue

7

eissn

0304-8608

issn

1432-8798

journal_volume

152

pub_type

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