Engineered Saccharomyces cerevisiae for de novo δ-tocotrienol biosynthesis
Luyao Han, Yaokang Wu, Yameng Xu, Chenyang Zhang, Yanfeng Liu, Jianghua Li, Guocheng Du, Xueqin Lv, Long Liu
Systems Microbiology and Biomanufacturing ›› 2023, Vol. 4 ›› Issue (1) : 150-164.
Engineered Saccharomyces cerevisiae for de novo δ-tocotrienol biosynthesis
As a vitamin E isomer, δ-tocotrienol has attracted much attention owing to its rich biological activities for human health, especially anticancer activities. Microbial biosynthesis constitutes a promising strategy of δ-tocotrienol production owing to its economic and environmental advantages. In this study, we employed modular engineering strategies to reconstruct and optimize a de novo δ-tocotrienol biosynthesis pathway in Saccharomyces cerevisiae. Subsequently, the rate-limiting steps were identified and eliminated and the key enzymes were assembled in the δ-tocotrienol biosynthesis module to develop a substrate channeling and improve their catalytic efficiency. Furthermore, the shikimate and δ-tocotrienol biosynthesis modules were optimized via combination strategies to further increase δ-tocotrienol production, following which the δ-tocotrienol titer reached 1455.5 μg/L. Finally, overexpression of the endogenous transporter PDR11 and two-phase extraction fermentation were employed for δ-tocotrienol production, yielding up to 3262.2 μg/L δ-tocotrienol. Thus, the findings of this study demonstrate the possibility of efficient δ-tocotrienol biosynthesis in S. cerevisiae.
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