期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 69, 期 41, 页码 12241-12249出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c04471
关键词
Escherichia coli; riboflavin; rational metabolic engineering; purine pathway; redox rebalance; respiratory chain
资金
- National Key Research and Development Program of China [2021YFC2100700]
- National Natural Science Foundation of China [NSFC21621004, NSFC-21776208]
Riboflavin production in Escherichia coli LS31T was significantly increased by employing multiple strategies and optimizations, leading to the highest titer and yield achieved in fed-batch fermentation among all rationally engineered strains.
Riboflavin is widely used as a food additive. Here, multiple strategies were used to increase riboflavin production in Escherichia coli LS31T. First, purR deletion and co-overexpression of fbp, purF, prs, gmk, and ndk genes resulted in an increase of 18.6% in riboflavin titer (reaching 729.7 mg/L). Second, optimization of reduced nicotinamide adenine dinucleotide phosphate/ nicotinamide adenine dinucleotide ratio and respiratory chain activity in LS31T increased the titer up to 1020.2 mg/L. Third, the expression level of the guaC gene in LS31T was downregulated by ribosome binding site replacement, and the riboflavin production was increased by 10.6% to 658.5 mg/L. Then, all the favorable modifications were integrated together, and the resulting strain LS72T produced 1339 mg/L of riboflavin. Moreover, the riboflavin titer of LS72T reached 21 g/L in fed-batch cultivation, with a yield of 110 mg riboflavin/g glucose. To our knowledge, both the riboflavin titer and yield obtained in fed-batch fermentation are the highest ones among all the rationally engineered strains.
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