大肠杆菌
代谢途径
代谢工程
辅因子
化学
发酵
生物合成
葡萄糖醛酸
工业微生物学
甘油
产量(工程)
焊剂(冶金)
生物化学
NAD+激酶
代谢中间体
酶
有机化学
材料科学
多糖
基因
冶金
作者
Huihui Su,Fei Peng,Xiao‐Yang Ou,Ying‐Jie Zeng,Min‐Hua Zong,Wen‐Yong Lou
标识
DOI:10.1016/j.nbt.2020.03.004
摘要
D-glucaric acid (GA) has been identified as among promising biotechnological alternatives to oil-based chemicals. GA and its derivatives are widely used in food additives, dietary supplements, drugs, detergents, corrosion inhibitors and biodegradable materials. The increasing availability of a GA market is improving the cost-effectiveness and efficiency of various biosynthetic pathways. In this study, an engineered Escherichia coli strain GA10 was constructed by systematic metabolic engineering. This involved redirecting metabolic flux into the GA biosynthetic pathways, blocking the conversion pathways of d-glucuronic acid (GlcA) and GA into by-products, introducing an in situ NAD+ regeneration system and fine-tuning the activity of the key enzyme, myo-inositol oxygenase (Miox). Subsequently, the culture medium was optimized to achieve the best performance of the GA10 strain. GA was produced at 5.35 g/L (extracellular and intracellular), with a maximized yield of ∼0.46 mol/mol on d-glucose and glycerol, by batch fermentation. This work demonstrates efficient biosynthetic pathways of GA in E. coli by metabolic engineering and should accelerate the application of GA biosynthetic pathways in industrial processes.
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