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Hypersecretion of OmlA antigen in Corynebacterium glutamicum through high-throughput based development process

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Abstract

Outer membrane lipoprotein A (OmlA) is a vaccine antigen against porcine contagious pleuropneumonia (PCP), a disease severely affecting the swine industry. Here, we aimed to systematically potentiate the secretory production of OmlA in Corynebacterium glutamicum (C. glutamicum), a widely used microorganism in the food industry, by establishing a holistic development process based on our high-throughput culture platform. The expression patterns, expression element combinations, medium composition, and induction conditions were comprehensively screened or optimized in microwell plates (MWPs), followed by fermentation parameter optimization in a 4 × 1 L parallel fermentation system (CUBER4). An unprecedented yield of 1.01 g/L OmlA was ultimately achieved in a 5-L bioreactor following the scaling-up strategy of fixed oxygen mass transfer coefficient (kLa), and the produced OmlA antigen showed well-protective immunity against Actinobacillus pleuropneumoniae challenge. This result provides a rapid and reliable pipeline to achieve the hyper-production of OmlA, and possibly other recombinant vaccines, in C. glutamicum.

Key Points

• Established a holistic development process and applied it to potentiate the secretion of OmlA.

• The secretion of OmlA reached an unprecedented yield of 1.01 g/L.

• The recombinant OmlA antigen induced efficient protective immunity.

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Data availability

All data generated or analyzed during this study are included in this published article and its supplementary information files.

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Funding

This work was supported by the National Natural Science Foundation of China (No.22078128, 21878124, and 21938004), the 111 Project (No. 111–2-06), the Fundamental Research Funds for the Central Universities (No. JUSRP221032), Postgraduate Research & Practice Innovation Program of Jiangsu Province KYCX21-2028, National First-Class Discipline Program of Light Industry Technology and Engineering (LITE2018-24), the Opening Project of the Key Laboratory of Industrial Biotechnology, Ministry of Education (KLIBKF201802), British Council 527429894 and BBSRC BB/T013176/1.

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Contributions

All experiments were performed by M.S. with assistance X.G., A.L., and P.Z. Data analysis and experimental design performed by M.S., R.W., and J.Nie. This article was drafted by M.S. and X.G. with contributions to revision by R.L-A., X.L., Z.B., and Y.Y. All the authors read and approved the final manuscript.

Corresponding author

Correspondence to Xiuxia Liu.

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Ethics approval

All procedures for handling the mice used in this study were reviewed and approved by the Institute of Tecon Biology Co., Ltd (SYXK2021-0006) and performed in an ethical and humane manner under veterinary supervision.

Conflict of interest

The authors declare no competing interests.

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Alex Xiong Gao Co first author.

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Sun, M., Gao, A.X., Ledesma-Amaro, R. et al. Hypersecretion of OmlA antigen in Corynebacterium glutamicum through high-throughput based development process. Appl Microbiol Biotechnol 106, 2953–2967 (2022). https://doi.org/10.1007/s00253-022-11918-x

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  • DOI: https://doi.org/10.1007/s00253-022-11918-x

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