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  • Title: Improved campesterol production in engineered Yarrowia lipolytica strains.
    Author: Zhang Y, Wang Y, Yao M, Liu H, Zhou X, Xiao W, Yuan Y.
    Journal: Biotechnol Lett; 2017 Jul; 39(7):1033-1039. PubMed ID: 28357621.
    Abstract:
    OBJECTIVES: To engineer Yarrowia lipolytica for improving the heterologous production of campesterol (a key precursor to manufacture pharmaceutical steroids). RESULTS: By screening 7-dehydrocholesterol reductase (DHCR7) from diverse species, DHCR7 from Danio rerio was the best candidate for campesterol synthesis. Overexpression of ACL (ATP: citrate lyase) or POX2 (peroxisome acyl-CoA oxidase 2) were key to improving campesterol production. The highest yield of campesterol was 942 mg/l was with the strain overexpressing POX2 in a 5 l bioreactor via high cell density fermentation process with a restricted supply of carbon sourc, sunflower seed oil. CONCLUSIONS: A promising platform to synthesize downstream steroid drugs was established. Efficient approaches were provided to improve the production of desired molecules in Y. lipolytica with high oil utilization efficiency.
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