Abstract
The polyene macrolide rimocidin, produced by Streptomyces rimosus M527, was found to be highly effective against a broad range of fungal plant pathogens. Current understanding of the regulatory mechanism of rimocidin biosynthesis and morphological differentiation in S. rimosus M527 is limited. NsdA is considered a negative regulator involved in morphological differentiation and biosynthesis of secondary metabolites in some Streptomyces species. In this study, nsdAsr was cloned from S. rimosus M527. The role of nsdAsr in rimocidin biosynthesis and morphological differentiation was investigated by gene deletion, complementation, and over-expression. A ΔnsdAsr mutant was obtained using CRISPR/Cas9. The mutant produced more rimocidin (46%) and accelerated morphological differentiation than the wild-type strain. Over-expression of nsdAsr led to a decrease in rimocidin production and impairment of morphological differentiation. Quantitative RT-PCR analysis revealed that transcription of rim genes responsible for rimocidin biosynthesis was upregulated in the ΔnsdAsr mutant but downregulated in the nsdAsr over-expression strain. Similar effects have been described for Streptomyces coelicolor M145 and the industrial toyocamycin-producing strain Streptomyces diastatochromogenes 1628.
Key points
• A negative regulator for sporulation and rimocidin production was identified.
• The CRISPR/Cas9 system was used for gene deletion in S. rimosus M527.
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Acknowledgments
The authors are grateful to Prof. Yuhui Sun (Wuhan University) for kindly providing the pWHU2653. This work was supported by the National Natural Science Foundation of China (31772213, 31972320), and the excellent youth fund of Zhejiang province, China (LR17C140002).
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Z Liao, Z Song, and J Xu conducted experiments. Z Ma designed research and wrote this article. A Bechthold revised this article. XP Yu checked the final version. All authors read and approved the manuscript.
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Liao, Z., Song, Z., Xu, J. et al. Identification of a gene from Streptomyces rimosus M527 negatively affecting rimocidin biosynthesis and morphological differentiation. Appl Microbiol Biotechnol 104, 10191–10202 (2020). https://doi.org/10.1007/s00253-020-10955-8
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DOI: https://doi.org/10.1007/s00253-020-10955-8