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논문 기본 정보

자료유형
학술저널
저자정보
Wang Ling-Xu (State Key Laboratory of Bioreactor Engineering East China University of Science and Technology Shan) Zheng Gao-Fan (State Key Laboratory of Bioreactor Engineering East China University of Science and Technology Shan) Xin Xiu-Juan (State Key Laboratory of Bioreactor Engineering East China University of Science and Technology Shan) An Fa-Liang (State Key Laboratory of Bioreactor Engineering East China University of Science and Technology Shan)
저널정보
한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제32권 제9호
발행연도
2022.9
수록면
1,178 - 1,185 (8page)
DOI
10.4014/jmb.2106.06026

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Steroids are a class of compounds with cyclopentane polyhydrophenanthrene as the parent nucleus, and they usually have unique biological and pharmacological activities. Most of the biosynthesis of steroids is completed by a series of enzymatic reactions starting from cholesterol. Synthetic biology can be used to synthesize cholesterol in engineered microorganisms, but the production of cholesterol is too low to further produce other high-value steroids from cholesterol as the raw material and precursor. In this work, combinational strategies were established to increase the production of cholesterol in engineered Saccharomyces cerevisiae RH6829. The basic medium for high cholesterol production was selected by screening 8 kinds of culture media. Single-factor optimization of the carbon and nitrogen sources of the culture medium, and the addition of calcium ions, zinc ions and citric acid, further increased the cholesterol production to 192.53 mg/l. In the 5-L bioreactor, through the establishment of strategies for glucose and citric acid feeding and dissolved oxygen regulation, the cholesterol production was further increased to 339.87 mg/l, which was 734% higher than that in the original medium. This is the highest titer of cholesterol produced by microorganisms currently reported. The fermentation program has also been conducted in a 50-L bioreactor to prove its stability and feasibility.

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