Abstract
Streptomyces is currently the main producer of microbial pharmaceuticals from its secondary metabolites as natural products. It will be more beneficial if the promoters, which are particularly strong during the secondary metabolism of Streptomyces, are used to drive the efficient production of desired natural products with the coordination of bacterial growth. Here, in an industrial natamycin producer Streptomyces chattanoogensis L10, a strong promoter groESp was identified for this purpose based on the comparative proteomic analysis of the primary and secondary metabolism. With a constitutive promoter ermEp* as a control, the activity of groESp was weak in the primary metabolism, but about sixfold higher than ermEp* in the secondary metabolism, when the representative antibiotic natamycin was highly produced. Furthermore, when ScnRII, a pathway-specific positive regulator in natamycin biosynthesis, was expressed under groESp, the productivity of natamycin was about 20% higher in the secondary metabolism than that from ermEp*, but had no discrimination in the early 2 days. Thus, we showed that proteomics is an effective alternative way to identify promoters for the high yield of natamycin in S. chattanoogensis, and this strategy can be widely adaptable to other Streptomyces species for the full development of secondary metabolites with promising bioactivities.
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Acknowledgements
This work was financially supported by National Key Research and Development Program (2016YFD0400805), and Natural Science Foundation of China (31571284, 31470212, 31520103901).
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Wang, K., Chen, XA., Li, YQ. et al. Identification of a secondary metabolism-responsive promoter by proteomics for over-production of natamycin in Streptomyces. Arch Microbiol 201, 1459–1464 (2019). https://doi.org/10.1007/s00203-019-01710-3
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DOI: https://doi.org/10.1007/s00203-019-01710-3