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Cloning, Auto-induction Expression, and Purification of rSpaA Swine Erysipelas Antigen

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Abstract

This work reports the cloning, expression, and purification of a 42-kDa fragment of the SpaA protein from Erysipelothrix rhusiopathiae, the main antigenic candidate for a subunit vaccine against swine erysipelas. The use of an auto-induction protocol to improve heterologous protein expression in recombinant Escherichia coli cultures was also investigated. The cellular growth pattern and metabolite formation were evaluated under different induction conditions. The His-tagged protein was over-expressed as inclusion bodies, and was purified by a single chromatography step under denaturing conditions. Auto-induction conditions were shown to be an excellent process strategy, leading to a high level of rSpaA expression (about 25 % of total cellular protein content) in a short period of time.

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Acknowledgments

The authors gratefully acknowledge financial support from Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). We thank Amadeus Azevedo for technical assistance and Dr. Heloísa S. Selistre de Araújo for helping during antibody preparation. We also thank Fernando F. P. de Paula and Dr. Flávio H. Silva for sequencing the recombinant plasmids used in this work.

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Correspondence to Adilson José da Silva.

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da Silva, A.J., da Costa Iemma, M.R., Luperni Horta, A.C. et al. Cloning, Auto-induction Expression, and Purification of rSpaA Swine Erysipelas Antigen. Curr Microbiol 65, 369–374 (2012). https://doi.org/10.1007/s00284-012-0171-y

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  • DOI: https://doi.org/10.1007/s00284-012-0171-y

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