Daptomycin production enhancement by ARTP mutagenesis and fermentation optimization in Streptomyces roseosporus.

We evaluated whether the randomness of mutation breeding can be regulated through a double-reporter system. We hope that by establishing a new precursor feeding strategy, the production capacity of industrial microorganisms after pilot scale-up can be further improved. In this study, the industrial strain Streptomyces roseosporus L2796 was used as the starter strain for daptomycin production, and a double-reporter system with the kanamycin resistance gene Neo and the chromogenic gene gusA was constructed to screen for high-yield strain L2201 through atmospheric and room temperature plasma (ARTP). Furthermore, the composition of the culture medium and the parameters of precursor replenishment were optimized, resulting in a significant enhancement of the daptomycin yield of the mutant strain L2201(752.67 mg/l). This study successfully screened a high-yield strain of daptomycin through a double-reporter system combined with ARTP mutation. The expression level of two reporter genes can evaluate the strength of dptEp promoter, which can stimulate the expression level of dptE in the biosynthesis of daptomycin, thus producing more daptomycin. The developed multi-stage feeding rate strategy provides a novel way to increase daptomycin in industrial fermentation. Published by Oxford University Press on behalf of Applied Microbiology International 2023.

Citation

Chen-Yang Zhu, Xin-Yi Zhao, Zhong-Yuan Lyu, Wen-Li Gao, Qing-Wei Zhao, Xin-Ai Chen, Yong-Quan Li. Daptomycin production enhancement by ARTP mutagenesis and fermentation optimization in Streptomyces roseosporus. Journal of applied microbiology. 2023 Oct 04;134(10)

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PMID: 37873659

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