Engineering Bafilomycin High-Producers by Manipulating Regulatory and Biosynthetic Genes in the Marine Bacterium Streptomyces lohii
Open Access
- 11 January 2021
- journal article
- research article
- Published by MDPI AG in Marine Drugs
- Vol. 19 (1), 29
- https://doi.org/10.3390/md19010029
Abstract
Bafilomycin A1 is the representative compound of the plecomacrolide natural product family. This 16-membered ring plecomacrolide has potent antifungal and vacuolar H+-ATPase inhibitory activities. In our previous work, we identified a bafilomycin biosynthetic gene cluster (baf) from the marine bacterium Streptomyces lohii ATCC BAA-1276, wherein a luxR family regulatory gene orf1 and an afsR family regulatory gene bafG were revealed based on bioinformatics analysis. In this study, the positive regulatory roles of orf1 and bafG for bafilomycin biosynthesis are characterized through gene inactivation and overexpression. Compared to the wild-type S. lohii strain, the knockout of either orf1 or bafG completely abolished the production of bafilomycins. The overexpression of orf1 or bafG led to 1.3- and 0.5-fold increased production of bafilomycins, respectively. A genetically engineered S. lohii strain (SLO-08) with orf1 overexpression and inactivation of the biosynthetic genes orf2 and orf3, solely produced bafilomycin A1 with the titer of 535.1 ± 25.0 mg/L in an optimized fermentation medium in shaking flasks. This recombinant strain holds considerable application potential in large-scale production of bafilomycin A1 for new drug development.Keywords
Funding Information
- National Key Research and Development Program of China (2019YFA0905704 and 2019YFA0905100)
- National Natural Science Foundation of China (32025001, 82022066, 81741155 and 32000039)
- Weihai Science and Technology Development Program (2018ZC11)
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