期刊
ACS SYNTHETIC BIOLOGY
卷 11, 期 8, 页码 2685-2696出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssynbio.2c000982685
关键词
Saccharomyces cerevisiae; lanosterol synthase; triterpenoids; flux redirection; metabolic engineering; natural products; synthetic biology
资金
- Notes
- National Key R&D Program of China [2021YFC2100500, 2019YFA0904104]
- Funda- mental Research Funds for the Central Universities
- Innovation Team Project of Colleges and Universities in Jinan [2019GXRC033]
- Biological and Medical Engineering Core Facilities of the Beijing Institute of Technology
This study successfully engineered the critical amino acid residues of Erg7p in Saccharomyces cerevisiae to lower its enzyme activity, resulting in increased production of triterpenoids.
Triterpenoids are a subgroup of terpenoids and have wide applications in the food, cosmetics, and pharmaceutical industries. The heterologous production of various triterpenoids in Saccharomyces cerevisiae, as well as other microbes, has been successfully implemented as these production hosts not only produce the precursor of triterpenoids 2,3-oxidosqualene by the mevalonate pathway but also allow simple expression of plant membrane-anchored enzymes. Nevertheless, 2,3oxidosqualene is natively converted to lanosterol catalyzed by the endogenous lanosterol synthase (Erg7p), causing low production of recombinant triterpenoids. While simple deletion of ERG7 was not effective, in this study, the critical amino acid residues of Erg7p were engineered to lower this critical enzyme activity. The engineered S. cerevisiae indeed accumulated 2,3-oxidosqualene up to 180 mg/L. Engineering triterpenoid synthesis into the ERG7-modified strain resulted in 7.3- and 3-fold increases in the titers of dammarane-type and lupane-type triterpenoids, respectively. This study presents an efficient inducer-free strategy for lowering Erg7p activity, thereby providing 2,3-oxidosqualene for the enhanced production of various triterpenoids.
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