Biotechnology Bulletin ›› 2016, Vol. 32 ›› Issue (1): 138-143.doi: 10.13560/j.cnki.biotech.bull.1985.2016.01.023

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Prokaryotic Expression of i-type Lysozyme from Periplaneta americana and Preparation of Its Polyclonal Antibodies

WANG Yun1, ZHAI Su-zhen2, ZHANG Chun-lin2, WANG Ji-ping2   

  1. 1. School of Biology and Engineering, Guizhou Medical University, Guiyang 550004;
    2. School of Basic Medical Sciences, Guizhou Medical University, Guiyang 550004
  • Received:2015-05-19 Online:2016-01-09 Published:2016-01-22

Abstract: The objective of this work is to express i-type lysozyme(PaI)from Periplaneta americana in Escherichia coli and prepare its polyclonal antibodies of anti-PaI in mice. The coding gene of mature peptide region was amplified by PCR and prokaryotic expression vector pET28a-PaI was constructed. PaI-His fusion protein was expressed with IPTG induction and purified by Ni-NTA affinity chromatography. Then, Balb/c mice were immunized with the purified recombinant protein, and the titers of antiserum and the specificity of polyclonal antibodies were detected by indirect ELISA and Western blotting respectively. Results were as below. The length of nucleotide sequence encoding the mature peptide was 414 bp that encoded a putative protein with 137 amino acids. The constructed prokaryotic expression vector pET28a-PaI was successfully expressed in Escherichia coli. SDS-PAGE detection indicated that the PaI-His fusion protein was about 18 kD. Indirect ELISA and Western blotting analysis showed that the antiserum from immunized mice had high titer and specificity. In conclusion, the prokaryotic expression of PaI protein was successfully realized, and the anti-PaI polyclonal antibody with high efficiency and specificity were prepared, which laid the foundation for the further researches on the biological function of PaI protein.

Key words: Periplaneta americana, lysozyme, prokaryotic expression, polyclonal antibody