Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (1): 104-111.DOI: 10.3969/j.issn.1004-1524.2021.01.13

• Plant Protection • Previous Articles     Next Articles

Prokaryotic expression of Plantago asiatica mosaic virus capsid protein and preparation of its polyclonal antibody

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

  1. 1. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
    2. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-08-07 Online:2021-01-25 Published:2021-01-25
  • Contact: ZHANG Yubao

Abstract:

The cp gene of Plantago asiatica mosaic virus (PlAMV) was cloned from an isolate of PlAMV, obtained from lily growing in Gansu Province, China. The cp gene fragment of 621 bp was constructed into the prokaryotic expression vector pET-28a (+), and the recombinant plasmid was transformed into Escherichia coli BL21 (DE3) to express the fusion CP protein. After IPTG induction and Ni-NTA gravity column chromatography, purified CP fusion protein was obtained and used as immunogen to prepare a rabbit-derived anti-CP polyclonal antibody. BLAST result showed that the similarity of nucleotide and amino acid sequences of cp gene was up to 74.7%-100% and 83.6%-100% between the cloned PlAMV isolate and the known PlAMV isolates, respectively. We noted that cp sequences from different hosts were significantly different, which suggested the distribution of PlAMV population was influenced by species of host. SDS-PAGE indicated that CP protein was highly expressed in E. coli BL21 (DE3), and had a relative protein molecular weight of 24 ku. Western blot result demonstrated that the prepared polyclonal antibody could successfully capture the natural PlAMV capsid proteins, which was used to check the expression level of PlAMV protein in susceptible plant tissue. This work provided a reference for the study of the pathogenic mechanism of PlAMV and the development of serological detection techniques for the virus.

Key words: lily, Plantago asiatica mosaic virus, capsid protein, prokaryotic expression, polyclonal antibody

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