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Suppressor of RNA silencing encoded by Tomato yellow leaf curl virus-Israel
7) 159–165
/locate/yviroVirology 358 (200Suppressor of RNA silencing encoded by
Tomato yellow leaf curl virus-Israel
Avi Zrachya a, Efrat Glick a, Yael Levy a, Tzahi Arazi a, Vitaly Citovsky b, Yedidya Gafni a,?
a Institute of Plant Sciences, Agricultural Research Organization, Volcani Center, P.O. Box 6, Bet Dagan 50250, Israel
b Department of Biochemistry and Cell Biology, State University of New York, Stony Brook, NY 11794-5215, USA
Received 20 June 2006; returned to author for revision 12 July 2006; accepted 14 August 2006
Available online 18 September 2006Abstract
The Israeli isolate of Tomato yellow leaf curl geminivirus (TYLCV-Is) is a major tomato pathogen, causing extensive crop losses both in the
New and Old World. Surprisingly, however, little is known about the molecular mechanisms of TYLCV-Is interactions with tomato cells. Here, we
have identified a TYLCV-Is protein, V2, which acts as a suppressor of RNA silencing and which is unrelated to presently known viral suppressors.
Specifically, V2, but not other proteins of TYLCV-Is, inhibited RNA silencing of a reporter transgene, GFP. This inhibition elevated the cellular
levels of the GFP transcript and the GFP protein, but it had no apparent effect on the accumulation of GFP-specific short interfering RNAs
(siRNAs), suggesting that TYLCV-Is V2 targets a step in the RNA silencing pathway which is subsequent to the Dicer-mediated cleavage of
dsRNA. Visualization of the sub-cellular localization of TYLCV-Is V2 in plant protoplasts and tissues showed that this protein is associated with
cytoplasmic strands and inclusion bodies in the cortical regions of the cell.
? 2006 Elsevier Inc. All rights reserved.Keywords: Tomato yellow leaf curl virus; RNA silencing suppressor; Sub-cellular localizationIntroduction
Tomato yellow leaf curl virus (TYLCV), a whitefly-
transmitted geminivirus, is a major tomato pathogen world-
wide (Gafni, 2003; Moriones and Navas-Castillo, 2000; Nakhla
and Maxwell, 1997), and its Israeli
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