Abstract
The deep-sea-derived microbe Streptomyces scopuliridis SCSIO ZJ46 produces desotamides A–D. Notably, desotamides A and B display antibacterial activities against pathogenic Gram-positive Streptococcus pneumoniae NCTC 7466, Staphylococcus aureus ATCC 29213, and the methicillin-resistant clinical isolate Staphylococcus epidermidis (MRSE) shhs-E1. The 39-kb desotamide biosynthetic gene cluster (dsa) has previously been identified and heterologously expressed in S. coelicolor M1152 for the purposes of assigning dsa gene functions. In this work, we identified seven genes in the dsa cluster including three regulatory genes (dsaA, dsaM, and dsaN), two transporter genes (dsaK and dsaL), and two other genes, dsaB (annotated as a phosphate synthase) and dsaJ (a PBP-type thioesterase). The DsaA and DsaN were unambiguously shown to be positive regulators of desotamide biosynthesis, and consistent with these roles, inactivation of either gene completely abolished desotamide production. Moreover, overexpression of dsaA or dsaN (independent of each other) was shown to improve desotamide titers. Production of desotamides in M1152/07-6H::dsaA strain was 2.4-fold greater than that in the heterologous dsa expression strain M1152/07-6H whereas desotamide titers from the M1152/07-6H::dsaN strain were about twice that of M1152/07-6H. In addition, inactivation of dsaB and dsaJ (independent of each other) completely abolished desotamide production, indicating their indispensability for desotamide assembly. These studies provide new insights into the functions and combinatorial biosynthetic potentials of seven key genes within the dsa biosynthetic gene cluster. Findings reported here are likely to facilitate further efforts aimed at assessing and developing the desotamides and related analogs for future applications.
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Acknowledgments
We thank Dr. Changsheng Zhang (South China Sea Institute of Oceanology, Chinese Academy of Science) for kind supply of plasmid pPWW50.
Funding
This study was supported in part by the Natural Key Research and development Program of China (2017YFD0201400), the China NSF (31670087, 31400072 and U1706206), the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou, GML2019ZD0406), the Guangdong NSF (2016A030312014), the Pearl River S&T Nova Program of Guangzhou (201806010109), the Special Support Program for Training High-Level Talents in Guangdong (No. 2016TQ03R288), and the CAS (XDA13020302-2).
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Qinglian Li and Jianhua Ju conceived and designed study. Wenjuan Ding and Yuliang Dong conducted experiments. Qinglian Li and Wenjuan Ding analyzed data. Wenjuan Ding, Qinglian Li, and Jianhua Ju wrote the manuscript. All authors read and approved the manuscript.
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Ding, W., Dong, Y., Ju, J. et al. The roles of genes associated with regulation, transportation, and macrocyclization in desotamide biosynthesis in Streptomyces scopuliridis SCSIO ZJ46. Appl Microbiol Biotechnol 104, 2603–2610 (2020). https://doi.org/10.1007/s00253-020-10414-4
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DOI: https://doi.org/10.1007/s00253-020-10414-4