期刊
METABOLIC ENGINEERING
卷 51, 期 -, 页码 70-78出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ymben.2018.10.001
关键词
Triterpenoids; Maslinic acid; Corosolic acid; Saccharomyces cerevisiae; Yeast cell factories
资金
- Key Research Program of the Chinese Academy of Science [KFZD-SW-215]
- National Natural Science Foundation of China [31522002, 81202864]
- Key Projects in the Tianjin Science & Technology Pillar Program [15PTCYSY00020]
- Youth Innovation Promotion Association of the CAS [2015138]
- CAS Pioneer Hundred Talents Program [2016-053]
C-2 alpha hydroxylated triterpenoids are a large class of plant secondary metabolites. These compounds, such as maslinic, corosolic and alphitolic acid, have important biological activities against HIV, cancer and diabetes. However, the biosynthesis pathways of these compounds have not been completely elucidated. Specifically, the cytochrome P450 (CYP) enzyme responsible for C-2 alpha hydroxylation was unknown. In this study, a novel CYP enzyme that catalyzes C-2 alpha hydroxylation was identified in Crataegus pinnatifida (Hawthorn) using a metabolic engineering platform. It is a multifunctional enzyme with C-2 alpha oxidase activity on oleanane-, ursane- and lupane-type pentacyclic triterpenoids. In addition, the complete biosynthesis pathways of these three triterpenoids were reconstituted in yeast, resulting in the production of 384, 141 and 23 mg/L of maslinic, corosolic and alphitolic acid, respectively. This metabolic engineering platform for functional gene identification and strain engineering can serve as the basis for creating alternative pathways for the microbial production of important natural products.
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