Abstract
The transposon mutagenesis strategy has been employed to generate random insertion mutants and analyze the correlation between genes and secondary metabolites in the genus Streptomyces. In this study, our primary objective was to identify an unknown gene involved in rimocidin biosynthesis and elucidate its role in rimocidin production in Streptomyces rimosus M527. To achieve this, we established a random mutant library of S. rimosus M527 using a Tn5 transposon-mediated random mutagenesis strategy. Among the 137 isolated mutants, M527-G10 and M527-W5 exhibited the most significant variations in antagonistic activity against the plant pathogenic fungus Fusarium oxysporum f. sp. cucumerinum. Specifically, M527-G10 displayed a 72.93% reduction, while M527-W5 showed a 49.8% increase in rimocidin production compared to the wild-type (WT) strain S. rimosus M527. Subsequently, we employed a plasmid rescue strategy to identify the insertion loci of the transposon in the genomes of mutants M527-G10 and M527-W5, revealing a response regulator transcription factor (rrt) and a hypothetical protein (hyp), respectively. The roles of rrt and hyp in rimocidin biosynthesis were determined through gene deletion, overexpression in the WT strain, and complemented expression in the transposon mutants. Notably, the gene-deletion mutants M527-ΔRRT and M527-ΔHYP exhibited similar behavior in rimocidin production compared to the corresponding transposon mutants M527-G10 and M527-W5, suggesting that transposon insertions in genes rrt and hyp led to alterations in rimocidin production. Furthermore, both gene deletion and overexpression of rrt and hyp had no discernible effects on cell growth. These results reveal that genes rrt and hyp have positive and negative impacts on rimocidin production in S. rimosus M527, respectively.
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Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (32272616, 31772213), Key Program of Zhejiang Province Natural Science Foundation (LZ22C140002).
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H Bao, H Li and Y Zhang conducted experiments. Z Ma designed research and wrote this article. A Bechthold revised this article. X Yu checked the final version. All authors read and approved the manuscript.
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H Bao, H Li and Y Zhang conducted experiments. Z Ma designed research and wrote this article. A Bechthold revised this article. X Yu checked the final version. All authors read and approved the manuscript.
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Bao, Hy., Li, Hj., Zhang, Yy. et al. Transposon-based identification of genes involved in the rimocidin biosynthesis in Streptomyces rimosus M527. World J Microbiol Biotechnol 39, 359 (2023). https://doi.org/10.1007/s11274-023-03814-x
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DOI: https://doi.org/10.1007/s11274-023-03814-x