Metabolic engineering of Bacillus subtilis for enhancing riboflavin production by alleviating dissolved oxygen limitation

被引:47
作者
You, Jiajia [1 ]
Yang, Chen [1 ]
Pan, Xuewei [1 ]
Hu, Mengkai [1 ]
Du, Yuxuan [1 ]
Osire, Tolbert [1 ]
Yang, Taowei [1 ]
Rao, Zhiming [1 ]
机构
[1] Jiangnan Univ, Sch Biotechnol, Key Lab Ind Biotechnol, Lab Appl Microorganisms & Metab Engn,Minist Educ, Wuxi 214122, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
Bacillus subtilis; Riboflavin (Vitamin B2); Dissolved oxygen; Nitrogen metabolism; Dynamic control; ESCHERICHIA-COLI; LIPID PRODUCTION; PURINE PATHWAY; AVAILABILITY; OPTIMIZATION; COMBINATION; EXPRESSION; NITROGEN; GENE;
D O I
10.1016/j.biortech.2021.125228
中图分类号
S2 [农业工程];
学科分类号
0828 ;
摘要
Riboflavin, an essential vitamin for animals, is used widely in the pharmaceutical industry and as a food and feed additive. The microbial synthesis of riboflavin requires a large amount of oxygen, which limits the industrial scale production of the vitamin. In this study, a metabolic engineering strategy based on transcriptome analysis was identified as effective in increasing riboflavin production. First, transcriptional profiling revealed that hypoxia affects purine, and nitrogen metabolism. Next, the precursor supply pool was increased by purR knockout and tnrA and glnR knockdown to balance intracellular nitrogen metabolism. Finally, increased oxygen utilization was achieved by dynamically regulating vgb. Fed-batch fermentation of the engineered strain in a 5 liter bioreactor produced 10.71 g/l riboflavin, a 45.51% higher yield than that obtained with Bacillus subtilis RF1. The metabolic engineering strategy described herein is useful for alleviating the oxygen limitation of bacterial strains used for the industrial production of riboflavin and related products.
引用
收藏
页数:11
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