Generation in yeast of recombinant virus-like particles of porcine circovirus type 2 capsid protein and their use for a serologic assay and development of monoclonal antibodies

BMC Biotechnology

Alma Gedvilaite²  Kestutis Sasnauskas²  Aurelija Zvirbliene²  Vilimas Sereika¹  Raimundas Lelesius¹  Jonas Dabrisius²  Rasa Petraityte-Burneikiene²  Rita Lasickiene²  Juozas Nainys² 

[1]Institute of Microbiology and Virology, Veterinary Faculty of Veterinary Academy, Lithuanian University of Health Sciences, Tilzes 18, Kaunas, LT-47181, Lithuania

[2]Institute of Biotechnology, Vilnius University, Graiciuno 8, Vilnius, LT-02241, Lithuania

关键词: Monoclonal antibodies;    Porcine circovirus 2;    Virus-like particles;   

Others  :  1084336
DOI  :  10.1186/s12896-014-0100-1

 received in 2014-07-10, accepted in 2014-11-18,  发布年份 2014

【 摘 要 】

Background

Porcine circovirus type 2 (PCV2) is considered to be an important emerging pathogen associated with a number of different syndromes and diseases in pigs known as PCV2-associated diseases. It has been responsible for significant mortality among pigs and remains a serious economic problem to the swine industry worldwide leading to significant negative impacts on profitability of pork production.

Results

In this study we have demonstrated that PCV2 capsid (Cap) protein based virus-like particles (VLPs) were efficiently produced in yeast S. cerevisiae and induced production of monoclonal antibodies (MAbs) reactive with virus-infected cells. Moreover, PCV2 Cap VLPs served as a highly specific recombinant antigen for the development of an indirect IgG PCV2 Cap VLP-based ELISA for the detection of virus-specific IgG antibodies in swine sera. Four hundred-nine serum samples collected from pigs in Lithuania were tested for PCV2-specific IgG to determine the sensitivity and specificity of the newly developed ELISA in parallel using a commercial SERELISA test as a gold standard. From 409 tested serum samples, 297 samples were positive by both assays. Thirty-nine sera from 112 serum samples were determined as negative by SERELISA but were found to be positive both in the newly developed indirect IgG PCV2 Cap VLP-based ELISA and the PCR test.

Conclusions

We have demonstrated that S. cerevisiae expression system is an alternative to insect/baculovirus expression system for production of homogenous in size and shape PCV2 Cap protein-based VLPs similar to native virions. Yeast expression system tolerated native virus genes encoding PCV2 Cap protein variants as well as the codon-optimized gene. Moreover, yeast-derived PCV2 Cap VLPs were capable to induce the generation of PCV2-specific MAbs that did not show any cross-reactivity with PCV1-infected cells. The high sensitivity and specificity of the indirect IgG PCV2 Cap VLP-based ELISA clearly suggested that this assay is potentially useful diagnostic tool for screening PCV2–suspected samples.

【 授权许可】

   
2014 Nainys et al.; licensee BioMed Central Ltd.

【 图 表 】

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