›› 2019, Vol. 46 ›› Issue (6): 1808-1815.doi: 10.16431/j.cnki.1671-7236.2019.06.029

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Prokaryotic Expression of Bovine Papillomavirus Type 2 L1 Gene and Preparation of Polyclonal Antibody

DU Jiwen, LIU Yue, SONG Zhifeng, LU Zhaoxiang, XU Weicheng, LI Mingzhu, GAO Mingchun, WANG Junwei   

  1. College of Veterinary Medicine, Northeast Agricultural University, Harbin 150030, China
  • Received:2019-01-08 Online:2019-06-20 Published:2019-06-19

Abstract:

The test was aimed to express the L1 capsid protein of bovine papillomavirus (BPV),and prepare its polyclonal antibodies.Histopathological examination was conducted using the cutaneous papilloma samples of cattle.The L1 gene degenerate primer FAP59/FAP64 was used for amplification,and then specific primers were designed.The capsid protein L1 gene was subcloned into pET-30a(+) expression vector to construct recombinant prokaryotic expression vector pET30a-BPV2-L1.The recombinant protein rBPV2-L1 was expressed in E.coli RosettaTM(DE3)pLysS host strain,and the rabbit anti-BPV2-L1 protein polyclonal antibody was prepared by using purified rBPV2-L1 protein as immunogen,and then the titer was detected by indirect ELISA,indirect immunofluorescence assay was performed.The pathological tissue section observation showed that the epidermal cells proliferated,the keratin was excessive,and the tissue lesions of BPV infection such as cell hollowing occurred.Sequence analysis confirmed that the genotype of the BPV isolated strain was type 2,and the coding region of L1 gene was 1 494 bp,which could encode a capsid protein containing 497 amino acids with a molecular mass of 55.5 ku.Phylogenetic tree analysis with L1 amino acid sequence of each type of BPV showed that it was in the same genetic evolution branch as BPV2-SW01 (GenBank accession No.:KC878306.1) and BPV2 (GenBank accession No.:KX113620.1),and belonged to the genus Delta.The induced expression of rBPV2-L1 protein was mainly present in the precipitate in the form of inclusion bodies.The indirect ELISA assay results showed that the polyclonal antibody titer was as high as 1:163 840.Indirect immunofluorescence analysis results showed that the rabbit anti-BPV2-L1 polyclonal antibody reacted specifically with the transiently expressed BPV2-L1 protein.The above results confirmed that the BPV2 L1 gene was successfully cloned and expressed in this study,and the recombinant protein rBPV2-L1 had good immunogenicity.The prepared polyclonal antibody against BPV2-L1 protein had good immunological activity,and laid the foundation for further study of the BPV2 subunit vaccine.

Key words: bovine papilloma virus(BPV); L1 gene; prokaryotic expression; polyclonal antibody

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