Expression and immunological studies of classical swine fever virus glycoprotein E2 in the bi-cistronic baculovirus/larvae expression system

Bioscience, Biotechnology, and Biochemistry
Chi-Ming WuMaw-Sheng Chien

Abstract

To develop an economical, easy technique for producing recombinant E2 glycoprotein (rE2) of classical swine fever virus (CSFV) as a candidate immunogen, a bi-cistronic baculovirus/larvae expression vector was constructed using p10 promoter, an internal ribosome entry site, and the gfp gene. Trichoplusia ni larvae were successfully infected with the occluded recombinant baculovirus via feed, and the characteristics of rE2 were confirmed by immunoblot and glycosylation stain. rE2 at a concentration of 0.6-0.8 mg/ml without degradation was obtained from hemolymphs of infected larvae that emitted high levels of green fluorescence. Immunization assays indicated that mice and piglets immunized with rE2-containing hemolymph elicited high titers of anti-CSFV E2 antibodies with virus-neutralizing activity. This is the first study to indicate that baculovirus/T. ni larvae-expressed rE2 can be served as a vaccine candidate. This system provides an economical alternative for the production of vaccine components in the veterinary industry.

References

Aug 2, 2001·Journal of Veterinary Diagnostic Investigation : Official Publication of the American Association of Veterinary Laboratory Diagnosticians, Inc·A ClavijoE M Zhou
Jan 3, 2003·Protein Expression and Purification·Deepak SehgalShahid Jameel
May 7, 2003·Applied Microbiology and Biotechnology·L IkonomouS N Agathos
Aug 9, 2005·Biochemical and Biophysical Research Communications·Ying-Ju ChenTzong-Yuan Wu

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