The Plant Pathology Journal

The Korean Society of Plant Pathology (한국식물병리학회)
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Effect of Rice stripe virus NS3 on Transient Gene Expression and Transgene Co-Silencing

  • Sohn, Seong-Han (National Academy of Agricultural Science, Rural Development Administration) ;
  • Huh, Sun-Mi (National Academy of Agricultural Science, Rural Development Administration) ;
  • Kim, Kook-Hyung (Department of Agricultural Biotechnology, Seoul National University) ;
  • Park, Jin-Woo (National Academy of Agricultural Science, Rural Development Administration) ;
  • Lomonossoff, George (Department of Biological Chemistry, John Innes Centre, Norwich Research Park)
  • Received : 2011.07.19
  • Accepted : 2011.08.30
  • Published : 2011.12.01
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Abstract

Nonstructural protein 3 (NS3) encoded by RNA3 of Rice stripe virus (RSV), known to be a suppressor of gene silencing, was cloned and sequenced. The cloned NS3 gene is composed of 636 nucleotides encoding 211 deduced amino acids, and showed a high degree of similarity with the equivalent genes isolated from Korea, Japan and China. The NS3 gene promoted the enhancement of transient gene expression and suppressed transgene co-silencing. In the transient GFP expression via agroinfiltration, GFP expression was dramatically enhanced in terms of both protein yield and expression period in the presence of NS3. The highest accumulation of GFP protein reached to 6.8% of total soluble proteins, which corresponded to a two-fold increase compared to that obtained in the absence of NS3. In addition, NS3 significantly suppressed the initiation of GFP co-silencing induced by the additive GFP infiltration in GFP-transgenic Nicotiana benthamiana. The NS3 gene was also found to be a stronger suppressor than Cucumber mosaic virus 2b. These observations are believed to be derived from the strong suppressive effect of NS3 on gene silencing, and indicate that NS3 could be used as an effective enhancer for the rapid production of foreign proteins in plants.

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References

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