Abstract
Staurosporine is the most well-known member of the indolocarbazole alkaloid family; it can induce apoptosis of many types of cells as a strong protein kinase inhibitor, and is used as an important lead compound for the synthesis of the antitumor drugs. However, the low fermentation level of the native producer remains the bottleneck of staurosporine production. Herein, integration of multi-copy biosynthetic gene cluster (BGC) in well characterized heterologous host and optimization of the fermentation process were performed to enable high-level production of staurosporine. First, the 22.5 kb staurosporine BGC was captured by CRISPR/Cas9-mediated TAR (transformation-associated recombination) from the native producer (145 mg/L), and then introduced into three heterologous hosts Streptomyces avermitilis (ATCC 31267), Streptomyces lividans TK24 and Streptomyces albus J1074 to evaluate the staurosporine production capacity. The highest yield was achieved in S. albus J1074 (750 mg/L), which was used for further production improvement. Next, we integrated two additional staurosporine BGCs into the chromosome of strain S-STA via two different attB sites (vwb and TG1), leading to a double increase in the production of staurosporine. And finally, optimization of fermentation process by controlling the pH and glucose feeding could improve the yield of staurosporine to 4568 mg/L, which was approximately 30-fold higher than that of the native producer. This is the highest yield ever reported, paving the way for the industrial production of staurosporine.
Keypoints
• Streptomyces albus J1074 was the most suitable heterologous host to express the biosynthetic gene cluster of staurosporine.
• Amplification of the biosynthetic gene cluster had obvious effect on improving the production of staurosporine.
• The highest yield of staurosporine was achieved to 4568 mg/L by stepwise increase strategy.
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Acknowledgements
We thank the support from Professor Yinhua Lu (College of Life and Environmental Sciences, Shanghai Normal University), and Professor Weihong Jiang (Institute of Plant Physiology and Ecology, Chinese Academy of Sciences) for kindly providing the plasmids pCAP01a, pLB1, pLR4 and pLTG1.
Funding
This study was supported by the National Key Research and Development Program of China (2021YFC2102100).
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ZYZ, SBY, and ZXL performed experiments and data analysis. ZYZ, YJW, and JWT wrote the manuscript and conceived the study. MQF and SXC coordinated the project. All authors read and approved the final manuscript.
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Zhang, Z., Yang, S., Li, Z. et al. High-titer production of staurosporine by heterologous expression and process optimization. Appl Microbiol Biotechnol 107, 5701–5714 (2023). https://doi.org/10.1007/s00253-023-12661-7
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DOI: https://doi.org/10.1007/s00253-023-12661-7