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Optimal Conditions for the Expression of Glycoprotein E2 of Classical Swine Fever Virus using Baculovirus in Insect Cells

  • Bae, Sung Min (Department of Agricultural Biology, College of Agriculture, Life and Environment Sciences, Chungbuk National University) ;
  • Lee, Seung Hee (Department of Agricultural Biology, College of Agriculture, Life and Environment Sciences, Chungbuk National University) ;
  • Kwak, Won Suk (Department of Agricultural Biology, College of Agriculture, Life and Environment Sciences, Chungbuk National University) ;
  • Ahn, Yong Oh (Department of Agricultural Biology, College of Agriculture, Life and Environment Sciences, Chungbuk National University) ;
  • Shin, Tae Young (Department of Agricultural Biology, College of Agriculture, Life and Environment Sciences, Chungbuk National University) ;
  • Woo, Soo Dong (Department of Agricultural Biology, College of Agriculture, Life and Environment Sciences, Chungbuk National University)
  • Received : 2014.12.26
  • Accepted : 2014.12.29
  • Published : 2014.12.31

Abstract

The structural proteins of classical swine fever virus (CSFV) consist of nucleocapsid protein C and envelope glycoprotein $E^{rns}$ (E0), E1 and E2. Among them, E2, the most immunogenic of the CSFV glycoproteins, induces a protective immune response in swine. In this study, to determine the optimal expression conditions of glycoprotein E2 using baculovirus system, we investigated the influence of insect cells and media to the expression of recombinant E2. Recombinant virus containing glycoprotein E2 coding gene was constructed with bApGOZA DNA. Expression of the glycoprotein E2 was analyzed by SDS-PAGE and Western blot analysis using anti-CSFV E2 monoclonal antibodies. Expression of glycoprotein E2 in Sf21 cells was first observed after 3 days and reached a maximum on the 5th day after infection. Furthermore, the highest levels of glycoprotein E2 expression were observed at multiplicity of infection (MOI) of 5. When three different insect cell lines (Sf21, High-Five and Se301) were tested, High-Five cells showed the highest production. In addition, four different serum-free and serum-supplemented media, respectively, were tested for the expression of glycoprotein E2 and the budded virus (BV) titers. As a result, serum-supplemented medium provided the best conditions for protein production and the BV yield.

Keywords

References

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