Enhanced Pentostatin Production in Actinomadura sp. by Combining ARTP Mutagenesis, Ribosome Engineering and Subsequent Fermentation Optimization

The special structure of pentostatin causes it to possess a wide spectrum of biological and pharmacological properties, and it has been extensively employed to treat malignant tumors and is the first-line treatment for hairy cell leukemia. Pentostatin is mainly distributed in several actinomycetes and fungi species. However, its low titer in microbes is not able to meet medical needs. Here, we report a strain improvement strategy based on combined atmospheric and room-temperature plasma (ARTP) mutagenesis and ribosome engineering screening, as well as fermentation optimization, for enhanced pentostatin production. The original strain,Actinomadurasp. ATCC 39365, was treated with ARTP and screened by ribosome engineering to obtain one stable pentostatin high-yield mutantActinomadurasp. S-15, which produced 86.35 mg/L pentostatin, representing a 33.79% increase compared toActinomadurasp. ATCC 39365. qRT-PCR analysis revealed that pentostatin biosynthesis-related gene expression was significantly upregulated inActinomadurasp. S-15. Then, to further enhance pentostatin production, the fermentation medium was optimized in flask culture and the pentostatin production ofActinomadurasp. S-15 reached 152.06 mg/L, which is the highest pentostatin production reported so far. These results demonstrate the effectiveness of combined ARTP mutation, ribosome engineering screening, and medium optimization for the enhancement of pentostatin production, and provide a methodology enabling the sustainable production of pentostatin on an industrial scale.Keywords:Actinomadurasp.;pentostatin;atmospheric and room temperature plasma;ribosome engineering