SONG Dan-dan, JIN Yi-xin, HUANG Yuan-hui, WANG Wen-feng, MIN Kai-jun, ZHANG Chuan-liang, LUO Ting-rong, LI Xiao-ning. 2024: Prokaryotic expression of Erns protein of classical swine fever virus and preparation of its polyclonal antibody. Journal of Southern Agriculture, 55(9): 2835-2842. DOI: 10.3969/j.issn.2095-1191.2024.09.027
Citation: SONG Dan-dan, JIN Yi-xin, HUANG Yuan-hui, WANG Wen-feng, MIN Kai-jun, ZHANG Chuan-liang, LUO Ting-rong, LI Xiao-ning. 2024: Prokaryotic expression of Erns protein of classical swine fever virus and preparation of its polyclonal antibody. Journal of Southern Agriculture, 55(9): 2835-2842. DOI: 10.3969/j.issn.2095-1191.2024.09.027

Prokaryotic expression of Erns protein of classical swine fever virus and preparation of its polyclonal antibody

  • 【Objective】 The study aimed to prepare polyclonal antibody against the Erns protein of the classical swine fe‐ ver virus(CSFV),which could provide theoretical basis for further exploring the structure and function of the Erns protein,as well as for elucidating the pathogenic mechanisms of CSFV. 【Method】 Bioinformatics methods were used to predict the structure of the Erns protein. The CSFV Erns gene was cloned by PCR using the eukaryotic expression vector pCMVHA-Erns as a template,and the prokaryotic expression vector pET-32a-Erns was constructed. The pET-32a-Erns vector was then transformed into Escherichia coli BL21(DE3)receptor cells,IPTG was added to induce the expression of Erns protein,confirming the expression form of Erns protein. The target protein was purified by Ni-NTA affinity chromatography to obtain high-purity Erns protein. Mice were immunized using the back subcutaneous multiple injection method,and after 4 immunizations,blood was collected to isolate serum for the preparation of polyclonal antibodies against the Erns protein, and their titer and specificity were assessed. 【Result】 The Erns protein lacked signal peptide and transmembrane domains, making it a hydrophilic protein that contained multiple B-cell epitopes. The size of the Erns gene fragment was 681 bp,and its recombinant protein was primarily expressed as inclusion bodies. The polyclonal antibodies against the Erns protein had titers of 1∶64000 for the prokaryotic expressed recombinant protein and 1∶1000 for the eukaryotic expressed recombinant protein,and they could specifically recognize CSFV. 【Conclusion】 The prepared polyclonal antibodies against the Erns protein possess high titer and strong specificity,making them suitable for detecting the expression levels of the Erns protein in cells using ELISA and Western blotting. The preparation of Erns protein polyclonal antibodies contributes to a better under‐ standing of the role of Erns protein in CSFV infection and immune processes. This has significant implications for further research into the function of Erns protein,the biological characteristics of CSFV,and the development of prevention and diagnostic methods for CSFV.
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