China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (9): 3438-3446.doi: 10.16431/j.cnki.1671-7236.2021.09.036

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Prokaryotic Expression and Reactogenicity Identification of G Protein Antigen Region of Bovine Respiratory Syncytial Virus

WU Chunxia1, ZHOU Yaping1, GUO Ting1, CUI Qi1, WANG Yuchen1, TIAN Guangyuan1, Sihan2, SUN Yanli3, HAO Yongqing1   

  1. 1. Laboratory of Veterinary Microbiology and Immunology, Inner Mongolia Agricultural University, Hohhot 010018, China;
    2. Animal Disease Prevention and Control Center of Hulunbuir City, Hulunbuir 021000, China;
    3. Agriculture and Animal Husbandry Bureau of Linhe District, Bayannur City, Inner Mongolia, Bayannur 015000, China
  • Received:2021-02-13 Online:2021-09-20 Published:2021-09-17

Abstract: The purpose of this study was to obtain recombinant G protein of Bovine respiratory syncytial virus (BRSV) and identify its reactogenicity. The nucleotide sequence of G gene was found from NCBI, its antigenic region was analyzed, and a pair of specific primers was designed with Primer Premier 5.0 software. The BRSV G gene fragment was amplified by RT-PCR and ligated to the cloning vector pMD19-T, and then it was identified by double enzyme digestion and sequenced. The gel was recovered from the target fragment digested by double enzyme, then the recombinant plasmid pET-32a-G was constructed and transformed into E. coli BL21(DE3) competent cells. The protein induced by IPTG was purified by Ni-IDA affinity chromatography and its concentration was determined, then the protein was analyzed and identified by SDS-PAGE and Western blotting. The results showed that the G gene with the size of 567 bp was successfully cloned and the soluble recombinant protein with molecular weight of 40 ku was obtained. After optimizing the induction conditions, the expressed product was identified by SDS-PAGE. The protein expression was the highest at 16 ℃, IPTG concentration 1.2 mmol/L and induction for 4 h. Through Western blotting detection, it found that the recombinant protein could react with goat BRSV standard positive serum specifically, indicating that the protein had reactivity. In summary, BRSV G protein was successfully expressed and purified in this study, which laid a foundation for the establishment of indirect ELISA detection of BRSV antibody and the development of BRSV subunit vaccine.

Key words: Bovine respiratory syncytial virus (BRSV); G protein; prokaryotic expression; soluble expression; reactogenicity

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