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Construction of a 3A system from BioBrick parts for expression of recombinant hirudin variants III in Corynebacterium glutamicum

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Abstract

Standardized parts can be efficiently assembled into novel biological systems using the three antibiotic (3A) system, ensuring the reusability of components and repeatability of experiments. In this study, we created the 3A expression system for easy construction of gene expression cassettes in Corynebacterium glutamicum (C. glutamicum), which was applied to screen combinations of promoters and signal peptides for improved secreted rhv3 production. We first obtained three strong promoters P2252, Podhi, and PyweA from all of promoters, which drive the highest expression of green fluorescent protein (egfp). The three promoters were then assembled with different signal peptides to generate a series of constructs using the 3A expression system developed in this study, from which the highest activity of rhv3 reached 3187.5 ATU/L of PyweA-CspA-rhv3. Further increased production of rhv3 achieved large-scale fermentation using 5-L jar bioreactor, with the highest rhv3 accumulation 1.21 g/L obtained after 40 h of cultivation, which is higher than 0.95 g/L reported in E. coli. To the best of our knowledge, this is the first report of rhv3 secretory expression in C. glutamicum, which could be applied for the production of other recombinant proteins with significant applications.

Key points

• We have exploited a 3A system for the genetic manipulation in C. glutamicum.

• We constructed element libraries for assembling standard sequence in C. glutamicum.

• The secreted expression of rhv3 was realized by 3A system in C. glutamicum.

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Funding

This work is supported by the National Natural Science Foundation of China (Nos. 21808082, 21878124, 21938004), the 111 Project (111-2-06), National First-Class Discipline Program of Light Industry Technology and Engineering (LITE2018-24), and the Opening Project of the Key Laboratory of Industrial Biotechnology, Ministry of Education (KLIB-KF201802).

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Contributions

Y.W., X.G., Y.Y., X.L., and Z.B. conceived the project and designed the experiments. Y.W. and M.S. performed the experiments. Y.W. analyzed the sequence data. Y.W. and Y.L. wrote and revised the manuscript. All authors read and approved the manuscript.

Corresponding authors

Correspondence to Xiuxia Liu or Zhonghu Bai.

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The authors declare that they have no conflict of interest.

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This article does not contain any study with human participants or animals performed by any of the authors.

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Xiong Gao is the co-first author.

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Wang, Y., Gao, X., Liu, X. et al. Construction of a 3A system from BioBrick parts for expression of recombinant hirudin variants III in Corynebacterium glutamicum. Appl Microbiol Biotechnol 104, 8257–8266 (2020). https://doi.org/10.1007/s00253-020-10835-1

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  • DOI: https://doi.org/10.1007/s00253-020-10835-1

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