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Crocetin Overproduction in Engineered Saccharomyces cerevisiae via Tuning Key Enzymes Coupled With Precursor Engineering.


ABSTRACT: Crocetin, an important natural carotenoid dicarboxylic acid with high pharmaceutical values, has been successfully generated from glucose by engineered Saccharomyces cerevisiae in our previous study. Here, a systematic optimization was executed for crocetin overproduction in yeast. The effects of precursor enhancement on crocetin production were investigated by blocking the genes involved in glyoxylate cycle [citric acid synthase (CIT2) and malic acid synthase (MLS1)]. Crocetin titer was promoted by 50% by ?CIT2 compared to that of the starting strain. Then, the crocetin production was further increased by 44% through introducing the forward fusion enzymes of PsCrtZ (CrtZ from Pantoea stewartii)-CsCCD2 (CCD2 from Crocus sativus). Consequently, the crocetin titer reached to 1.95 ± 0.23 mg/L by overexpression of PsCrtZ-CsCCD2 followed by medium optimization. Eventually, a titer of 12.43 ± 0.62 mg/L crocetin was achieved in 5-L bioreactor, which is the highest crocetin titer reported in micro-organisms.

SUBMITTER: Song T 

PROVIDER: S-EPMC7500066 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Crocetin Overproduction in Engineered <i>Saccharomyces cerevisiae</i> via Tuning Key Enzymes Coupled With Precursor Engineering.

Song Tianqing T   Wu Nan N   Wang Chen C   Wang Ying Y   Chai Fenghua F   Ding Mingzhu M   Li Xia X   Yao Mingdong M   Xiao Wenhai W   Yuan Yingjin Y  

Frontiers in bioengineering and biotechnology 20200904


Crocetin, an important natural carotenoid dicarboxylic acid with high pharmaceutical values, has been successfully generated from glucose by engineered <i>Saccharomyces cerevisiae</i> in our previous study. Here, a systematic optimization was executed for crocetin overproduction in yeast. The effects of precursor enhancement on crocetin production were investigated by blocking the genes involved in glyoxylate cycle [citric acid synthase (<i>CIT2</i>) and malic acid synthase (<i>MLS1</i>)]. Croce  ...[more]

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