›› 2018, Vol. 45 ›› Issue (7): 1740-1749.doi: 10.16431/j.cnki.1671-7236.2018.07.002

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Sequence Analysis and Prokaryotic Expression of Bovine Coronavirus S Gene

GAO Guoqiang1, WANG Mengxin1, LIU Mingming1, YU Rendong1, HOU Xilin1, ZHOU Yulong1, WU Rui1, ZHANG Guohua1, LIU Linshan1, REN Deqiang2   

  1. 1. College of Animal Science and Veterinary Medicine, Heilongjiang Bayi Agricultural University, Daqing 163319, China;
    2. Harbin Vico Biotechnology Development Co., Ltd., Harbin 150000, China
  • Received:2017-11-14 Online:2018-07-20 Published:2018-07-20

Abstract:

In order to understand the variation of bovine coronavirus (BCoV) S gene and establish an ELISA detection method,total RNA was extracted from neonatal calf diarrhea (CD) and adult cattle winter dysentery (WD) diarrhea samples from different farms.cDNA was synthesized,and S and S1 genes were supplemented by PCR.The target fragment S1 was lighted into the expression vector pET-32a(+) and transformed into E.coli BL21 (DE3).The recombinant plasmid was induced by IPTG after being verified by PCR,double enzyme digestion and sequencing.The results showed that the nucleotide identitie of S gene of CD and WD isolates was 98.4%,and the isolates had the highest nucleotide homology with the reference strain BCoV-ENT,which were 98.4% and 98.5%,respectively.The homology of CD isolate with the reference strain SUN5 was the lowest,which was 97.5%,and the homology of WD isolate with strain FRA/EPI/Caen/2004/13 was the lowest,which was 97.3%.The comparison showed that there were a big difference between the isolated strains and the known strains,and provided a basis for screening the vaccine candidate strains.At the same time,pET-32a-S1 expression vector was constructed.The recombinant bacteria could produce a large amount of fusion S1 protein in E.coli BL21 and obtain 58 ku expression product,induced by 0.2 mmol/L IPTG for 5 h.In this study,S1 protein was successfully expressed,and nucleotide evolution analysis of BCoV were carried out,which laid the foundation for the establishment of the vaccine immune effect evaluation method.

Key words: bovine coronavirus (BCoV); S gene; sequence analysis; prokaryotic expression

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