›› 2017, Vol. 44 ›› Issue (6): 1840-1846.doi: 10.16431/j.cnki.1671-7236.2017.06.037

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Study on Expression and Immune Effect of F Protein of Newcastle Disease Virus Type Ⅶ in Insect Cell

SUN Peng   

  1. Xuzhou Vocational College of Bioengineering, Xuzhou 221006, China
  • Received:2016-12-22 Online:2017-06-20 Published:2017-06-28

Abstract:

This experiment was conducted to study the protein expression of F gene of Newcastle disease virus (NDV) type Ⅶ by baculovirus expression system.The F gene was amplified by RT-PCR and cloned into pFastBac HT A plasmid, and then the recombinant plasmid was transformed into DH10Bac competent cells to get the positive recombinant bacmid.After 72 h transfection of Sf9 cell with recombinant bacmid, the expression of interest protein was detected by indirect immunofluorescence assay (IFA), SDS-PAGE analysis and Western blotting. Serum antibody titers of immunized SPF chickens were determined by ELISA and the protective properties were determined by protection test. The results showed that F gene was expressed in Sf9 cells infected with the recombinant baculovirus. The expressed protein could induce high titer specific antibody against NDV. The protective rate of recombinant F protein group was 90%, which was significantly higher than that of the negative control group. These results laid a foundation for study on NDV subunit vaccine.

Key words: Newcastle disease virus; fusion protein F; recombinant baculovirus; insect cell; immune effect

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