›› 2018, Vol. 45 ›› Issue (8): 2041-2048.doi: 10.16431/j.cnki.1671-7236.2018.08.001

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Expression and Identification of H Gene of CDV BJ16B2 Strain in Insect Baculovirus Expression System

CHEN Meirong1,2, LIN Weidong1, SONG Tianqi1, XIN Ting1, GUO Xiaoyu1, HUANG Kehe2, JIA Hong1   

  1. 1. Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China;
    2. College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, China
  • Revised:2018-05-14 Online:2018-08-20 Published:2018-08-15

Abstract:

To obtain the native conformation and antigenicity of hemagglutinin (H) protein of canine distemper virus (CDV) virulent strain,the H gene which referred to BJ16B2 strain was accurately amplified by RT-PCR and cloned into pFastBacTMHTA vector.The recombinant plasmid was confirmed by restriction enzyme digestion and DNA sequencing,H gene was analyzed and the recombinant plasmid was transformed into E.coli DH10BacTM competent cell,and constructed shuttle vector,which was transfected into Sf9 cell to save baculovirus expressing H protein.To determine the antigenicity of recombinant protein,Western blotting and IFA analysis were used to detect the interesting protein.The results demonstrated that H gene belongs to Asia-1 virulent strain,and the homology of nucleotide and amino acid among the reference strains was 89.8% to 99.3% and 89.6%to 99.5%,respectively.The fusion protein generated by recombinant baculovirus was reacted with both His-tag monoclonal antibodies and CDV positive serum by Western blotting test,and presented specific green fluorescence in IFA test (68 ku),which showed that this protein had sufficient antigenicity.The resluts served as a strong foundation for the the subsequent analysis of protein structure and antigenicity differences,the preparation of monoclonal antibodies and the development of CDV subunit vaccine.

Key words: canine distemper virus (CDV); H gene; insect baculovirus expression system

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