Abstract
Bacillus subtilis, belonging to the type species of Bacillus, is a type of soil-derived, low %G+C, endospore-forming Gram-positive bacterium. After the discovery of B. subtilis 168 that displayed natural competence, this bacterium has been intensively considered to be an ideal model organism and a robust host to study several basic mechanisms, such as metabolism, gene regulation, bacterial differentiation, and application for industrial purposes, such as heterologous protein expression and the overproduction of an array of bioactive molecules. Since the first report of heterologous overproduction of recombinant proteins in this strain, the bulk production of a multitude of valuable enzymes, especially industrial enzymes, has been performed on a relatively large scale. Since B. subtilis can non-specifically secrete recombinant proteins using various signal peptides, it has tremendous advantages over Gram-negative bacterial hosts. Along with the report of the complete genome sequence of B. subtilis, a number of genetic tools, including diverse types of plasmids, bacterial promoters, regulatory elements, and signal peptides, have been developed and characterized. These novel genetic elements tremendously accelerated genetic engineering in B. subtilis recombinant systems. In addition, with the development of several complex gene expression systems, B. subtilis has performed a number of more complex functions. This ability enables it to be a substantial chassis in synthetic biology rather than just a workhorse for the overproduction of recombinant proteins. In this review, we review the progress in the development of B. subtilis as a universal platform to overproduce heterologous diverse high-value enzymes. This progress has occurred from the development of biological parts, including the characterization and utilization of native promoters, the fabrication of synthetic promoters and regulatory elements, and the assembly and optimization of genetic systems. Some important industrial enzymes that have been produced in large quantities in this host are also summarized in this review. Furthermore, the ability of B. subtilis to serve as a cellular tool was also briefly recapitulated and reviewed.
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Acknowledgements
This study was supported by the International S&T Innovation Cooperation Key Project (2016YFE0127400), the Fundamental Research Funds for the Central Universities (JUSRP51713B), the Natural Science of Foundation of China (31400058), Priority Academic Program Development of Jiangsu Higher Education Institutions, the 111 Project (No.111-2-06), the Jiangsu Province “Collaborative Innovation Center for Advanced Industrial Fermentation” industry development program.
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Cui, W., Han, L., Suo, F. et al. Exploitation of Bacillus subtilis as a robust workhorse for production of heterologous proteins and beyond. World J Microbiol Biotechnol 34, 145 (2018). https://doi.org/10.1007/s11274-018-2531-7
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DOI: https://doi.org/10.1007/s11274-018-2531-7