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Sequential improvement of rimocidin production in Streptomyces rimosus M527 by introduction of cumulative drug-resistance mutations

  • Biotechnology Methods - Original Paper
  • Published:
Journal of Industrial Microbiology & Biotechnology

Abstract

Rimocidin is a polyene macrolide that exhibits a strong inhibitory activity against a broad range of plant-pathogenic fungi. In this study, fermentation optimization and ribosome engineering technology were employed to enhance rimocidin production in Streptomyces rimosus M527. After the optimization of fermentation, rimocidin production in S. rimosus M527 increased from 0.11 ± 0.01 to 0.23 ± 0.02 g/L during shake-flask experiments and reached 0.41 ± 0.05 g/L using 5-L fermentor. Fermentation optimization was followed by the generation of mutants of S. rimosus M527 through treatment of the strain with different concentrations of gentamycin (Gen) or rifamycin. One Genr mutant named S. rimosus M527-G37 and one Rifr mutant named S. rimosus M527-R5 showed increased rimocidin production. Double-resistant (Genr and Rifr) mutants were selected using S. rimosus M527-G37 and S. rimosus M527-R5, and subsequently tested. One mutant, S. rimosus M527-GR7, which was derived from M527-G37, achieved the greatest cumulative improvement in rimocidin production. In the 5-L fermentor, the maximum rimocidin production achieved by S. rimosus M527-GR7 was 25.36% and 62.89% greater than those achieved by S. rimosus M527-G37 and the wild-type strain S. rimosus M527, respectively. Moreover, in the mutants S. rimosus M527-G37 and S. rimosus M527-GR7 the transcriptional levels of ten genes (rimAsr to rimKsr) located in the gene cluster involved in rimocidin biosynthesis were all higher than those in the parental strain M527 to varying degrees. In addition, after expression of the single rimocidin biosynthetic genes in S. rimosus M527 a few recombinants showed an increase in rimocidin production. Expression of rimE led to the highest production.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (31772213), and the excellent youth fund of Zhejiang province, China (LR17C140002).

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Authors and Affiliations

  1. Zhejiang Provincial Key Laboratory of Biometrology and Inspection & Quarantine, College of Life Sciences, China Jiliang University, Xueyuan Street, Xiasha Higher Education District, Hangzhou, 310018, Zhejiang, People’s Republic of China

    Yanfang Zhao, Zhangqing Song, Zheng Ma & Xiaoping Yu

  2. Institute for Pharmaceutical Sciences, Pharmaceutical Biology and Biotechnology, University of Freiburg, 79104, Freiburg, Germany

    Andreas Bechthold

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  1. Yanfang Zhao
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  2. Zhangqing Song
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Correspondence to Zheng Ma or Xiaoping Yu.

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Zhao, Y., Song, Z., Ma, Z. et al. Sequential improvement of rimocidin production in Streptomyces rimosus M527 by introduction of cumulative drug-resistance mutations. J Ind Microbiol Biotechnol 46, 697–708 (2019). https://doi.org/10.1007/s10295-019-02146-w

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