State Key Laboratory of Food Nutrition and Safety, Key Laboratory of Industrial Fermentation Microbiology of the Ministry of Education, Tianjin Key Laboratory of Industrial Microbiology, College of Biotechnology, Tianjin University of Science and Technology, No. 29 the 13th Street TEDA, Tianjin, 300457, China.
Microb Biotechnol. 2021 Nov;14(6):2497-2513. doi: 10.1111/1751-7915.13768. Epub 2021 Feb 19.
The natural plant product bisabolene serves as a precursor for the production of a wide range of industrially relevant chemicals. However, the low abundance of bisabolene in plants renders its isolation from plant sources non-economically viable. Therefore, creation of microbial cell factories for bisabolene production supported by synthetic biology and metabolic engineering strategies presents a more competitive and environmentally sustainable method for industrial production of bisabolene. In this proof-of-principle study, for the first time, we engineered the oleaginous yeast Yarrowia lipolytica to produce α-bisabolene, β-bisabolene and γ-bisabolene through heterologous expression of the α-bisabolene synthase from Abies grandis, the β-bisabolene synthase gene from Zingiber officinale and the γ-bisabolene synthase gene from Helianthus annuus respectively. Subsequently, two metabolic engineering approaches, including overexpression of the endogenous mevalonate pathway genes and introduction of heterologous multidrug efflux transporters, were employed in order to improve bisabolene production. Furthermore, the fermentation conditions were optimized to maximize bisabolene production by the engineered Y. lipolytica strains from glucose. Finally, we explored the potential of the engineered Y. lipolytica strains for bisabolene production from the waste cooking oil. To our knowledge, this is the first report of bisabolene production in Y. lipolytica using metabolic engineering strategies. These findings provide valuable insights into the engineering of Y. lipolytica for a higher-level production of bisabolene and its utilization in converting waste cooking oil into various industrially valuable products.
天然植物产物二氢月桂烯醇可作为生产多种工业相关化学品的前体。然而,二氢月桂烯醇在植物中的丰度较低,使得从植物源中分离出来不具有经济可行性。因此,利用合成生物学和代谢工程策略,创建微生物细胞工厂来生产二氢月桂烯醇,是一种更具竞争力和环境可持续性的工业生产二氢月桂烯醇的方法。在这项原理验证研究中,我们首次通过异源表达白木香中的α-二氢月桂烯醇合酶、生姜中的β-二氢月桂烯醇合酶基因和向日葵中的γ-二氢月桂烯醇合酶基因,工程化产油酵母解脂耶氏酵母来生产α-二氢月桂烯醇、β-二氢月桂烯醇和γ-二氢月桂烯醇。随后,采用两种代谢工程方法,包括过表达内源性甲羟戊酸途径基因和引入异源多药外排转运蛋白,来提高二氢月桂烯醇的产量。此外,优化发酵条件以最大限度地提高工程化解脂耶氏酵母从葡萄糖生产二氢月桂烯醇的产量。最后,我们探索了工程化解脂耶氏酵母菌株从废食用油中生产二氢月桂烯醇的潜力。据我们所知,这是首次利用代谢工程策略在解脂耶氏酵母中生产二氢月桂烯醇的报道。这些发现为利用代谢工程策略构建解脂耶氏酵母生产二氢月桂烯醇提供了有价值的见解,并为利用废食用油转化为各种有工业价值的产品提供了思路。