Optimization of tetramycin production in Streptomyces ahygroscopicus S91

Journal of Biological Engineering

Guang Chen¹  Mengqiu Wang¹  Huanzhang Xia¹  Xianpu Ni¹ 

[1] School of Life Science and Biopharmaceutics, Shenyang Pharmaceutical University, No.103 Wenhua Road, Shenyang, Liaoning, China;

关键词: Tetramycin;    Streptomyces ahygroscopicus;    Polyene macrolide antibiotics;    Cytochrome P450 monooxygenase;    Metabolic engineering;   

DOI  :  10.1186/s13036-021-00267-4

来源: Springer

【 摘 要 】

BackgroundTetramycin is a 26-member tetraene antibiotic used in agriculture. It has two components, tetramycin A and tetramycin B. Tetramycin B is obtained by the hydroxylation of tetramycin A on C4. This reaction is catalyzed by the cytochrome P450 monooxygenase TtmD. The two components of tetramycin have different antifungal activities against different pathogenic fungi. Therefore, the respective construction of high-yield strains of tetramycin A and tetramycin B is conducive to more targeted action on pathomycete and has a certain practical value.ResultsStreptomyces ahygroscopicus S91 was used as the original strain to construct tetramycin A high-yield strains by blocking the precursor competitive biosynthetic gene cluster, disrupting tetramycin B biosynthesis, and overexpressing the tetramycin pathway regulator. Eventually, the yield of tetramycin A in the final strain was up to 1090.49 ± 136.65 mg·L− 1. Subsequently, TtmD, which catalyzes the conversion from tetramycin A to tetramycin B, was overexpressed. Strains with 2, 3, and 4 copies of ttmD were constructed. The three strains had different drops in tetramycin A yield, with increases in tetramycin B. The strain with three copies of ttmD showed the most significant change in the ratio of the two components.ConclusionsA tetramycin A single-component producing strain was obtained, and the production of tetramycin A increased 236.84% ± 38.96% compared with the original strain. In addition, the content of tetramycin B in a high-yield strain with three copies of ttmD increased from 26.64% ± 1.97 to 51.63% ± 2.06%.

【 授权许可】

CC BY