China Animal Husbandry and Veterinary Medicine ›› 2022, Vol. 49 ›› Issue (5): 1970-1976.doi: 10.16431/j.cnki.1671-7236.2022.05.038

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Expression and Immunogenicity of P[1] Bovine Rotavirus A VP8 Recombinant Protein

JIANG Xiaoming, TANG Cheng, YUE Hua   

  1. College of Animal and Veterinary Sciences, Southwest Minzu University, Chengdu 610041, China
  • Received:2021-11-15 Online:2022-05-05 Published:2022-04-29

Abstract: 【Objective】 The purpose of this study was to express P[1] Bovine rotavirus A (BRVA) VP8 recombinant protein by prokaryotic expression system,and evaluate its reactivity and immunogenicity.【Method】 The codon preference was optimized according to the VP8 gene sequence of domestic epidemic strain RVA/Cow-tc/CHN/SDA2/2018/G6P[1] (GenBank accession No.:MN937517),the prokaryotic expression system of P[1] BRVA VP8 E.coli was constructed,the recombinant plasmid was transformed into E.coli BL21(DE3) competent cells,the expression was induced by IPTG,and the recombinant protein was purified by nickel agarose affinity chromatography.Western blotting was used to identify the specific recognition ability of recombinant protein and rabbit anti-G6P[1] BRVA serum,and P[1] BRVA VP8 recombinant protein was used to immunize rabbits.Two weeks after the first immunization,the immunization was strengthened once and twice in total.The immunogenicity was evaluated by indirect ELISA and neutralization test.【Result】 The prokaryotic expression system of P[1] type BRVA VP8 recombinant protein was successfully constructed,SDS-PAGE showed that the recombinant protein was highly expressed with a size of 20 ku,and the recombinant protein existed in soluble form.Western blotting results showed that the recombinant protein could specifically bind to rabbit anti-G6P[1] BRVA serum.Indirect ELISA results showed that P[1] type BRVA VP8 recombinant protein could induce antibody production in rabbits.The antibody began to appear and increased rapidly in the 1st week after the first immunization,peaked in the 3rd week and remained at a high level until to the 5th week.The neutralization test results showed that the neutralization titers of immunized rabbit serum to G6P[1] and G8P[1] BRVA were 1∶17 783 and 1∶64,respectively.【Conclusion】 This study successfully constructed a prokaryotic expression system to express P[1] BRVA VP8 recombinant protein,and confirmed that it had good reactivity and immunogenicity,which laid a foundation for the development of BRVA subunit vaccine.

Key words: Bovine rotavirus A (BRVA); P[1]; VP8 protein; prokaryotic expression; immunogenicity

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