Comparison Promoter Activity of the p10 Gene between Bombyx mori Nucleopolyhedrovirus Variants

  • Hong, Hye-Kyung (Graduate School of Agricultural Biotechnology, Seoul National University) ;
  • Choi, Jae-Young (Graduate School of Agricultural Biotechnology, Seoul National University) ;
  • Woo, Soo-Dong (Graduate School of Agricultural Biotechnology, Seoul National University) ;
  • Lee, Hae-Kwang (Graduate School of Agricultural Biotechnology, Seoul National University) ;
  • Je, Yeon-Ho (Graduate School of Agricultural Biotechnology, Seoul National University)
  • Published : 2001.08.01

Abstract

To compare the p10 promoter activity of Bombyx mori nucleopolyhedrovirus (BmNPV)K1 and K4, recombinant viruses Bm101-LacZ and Bm104-LacZ with a lacZ gene under the control of each p10 promoter were constructed. The $\beta$-galactosidase activity due to Bm101-LacZ was about 5.5- and 1.1-fold higher than that due to Bm104-LacZ and BmK1-LacZ, respectively. expressing ${\beta}$-galactosidase under the control of a polyhedrin promoter. The recombinant virus BmK1-104LacZ with the same genome structure as Bm101-LacZ, except for a p10 promoter region, produced a similar ${\beta}$-galactosidase activity to that due to Bm104-LacZ and 5.5-fold lower than that due to Bm101-LacZ. The virus yield, expression level of polyhedrin, and polyhedra productivity for each recombinant virus was almost similar. These results suggested that the difference in the expression level of ${\beta}$-galactosidase resulted from a difference in the p10 promoter regions, and that an expression vector using the p10 promoter of BmNPV-K1 could be usefully exploited in the mass production of foreign proteins with silkworm larvae by means of oral ingestion.

Keywords

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