Acta Agriculturae Zhejiangensis ›› 2022, Vol. 34 ›› Issue (11): 2471-2481.DOI: 10.3969/j.issn.1004-1524.2022.11.16

• Plant Protection • Previous Articles     Next Articles

Prokaryotic expression of Konjac mosaic virus capsid protein and preparation of polyclonal antibody

TANG Guoliang1,2,3(), ZHANG Yubao1,2,*(), WANG Ruoyu1,2, WANG Yajun1,2, ZHAO Xia1,2, SU Xuesi1,2,3, JIN Weijie1,2,3   

  1. 1. Gaolan Ecological and Agricultural Comprehensive Test Station, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    2. Gansu Field Scientific Observation and Research Station for Agricultural Ecosystem, Lanzhou 730000, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2021-06-30 Online:2022-11-25 Published:2022-11-29
  • Contact: ZHANG Yubao

Abstract:

The samples of Angelica sinensis(Oliv.)Diels suspected to be infected with virus disease in Yuzhong County, Gansu Province were sequenced and identified by small RNA sequencing. It was found that Konjac mosaic virus(KoMV) was contained in the sample, and the cp gene of KoMV capsid protein was amplified by RT-PCR. The cloned KoMV cp gene connected to the prokaryotic expression vector pET-28a (+), and introduced into E.coli RosettaTM (DE3) to induce expression protein. The CP fusion protein was purified by Ni-NTA gravity column chromatography and immunized New Zealand white-eared rabbits with this protein as antigen to prepare polyclonal antibodies. Sequence analysis showed that the size of KoMV cp gene fragment was 840 bp, encoding a coat protein of 280 amino acids. Compared with KoMV isolates registered in GenBank, the nucleotide sequence similarity was 85.58%-99.41%, and the amino acid sequence similarity was 89.32%-99.29%. There were obvious regional and host differences in the distribution of KoMV virus populations. SDS-PAGE showed that the fusion protein of KoMV CP was expressed in large quantities in the form of inclusion bodies in E.coli RosettaTM (DE3) induced by different temperatures, and the molecular weight of the fusion proteins was 36 ku. The results of indirect ELISA and Western blot showed that the prepared polyclonal antibody had a titer of 32 000, which could specifically bind to the leaves of Angelica infected with KoMV and purified protein, showing good specificity. In this study, the polyclonal antibody IgG of KoMV CP fusion protein was successfully prepared, which laid a foundation for the development of serological detection technology of KoMV and the functional research of CP protein.

Key words: Angelica sinensis, Konjac mosaic virus, capsid protein, prokaryotic expression, polyclonal antibody

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