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Engineering Escherichia coli for the High-Titer Biosynthesis of Lacto-N-tetraose
Journal of Agricultural and Food Chemistry ( IF 5.7 ) Pub Date : 2022-06-22 , DOI: 10.1021/acs.jafc.2c02423
Miaomiao Hu 1 , Mengli Li 1 , Ming Miao 1, 2 , Tao Zhang 1
Affiliation  

Lacto-N-tetraose (LNT), a member of the human milk oligosaccharides family, has received widespread attention because of its importance in infant health. We constructed a whole-cell biotransformation method in Escherichia coli BL21(DE3) for high-titer LNT synthesis. The approach was performed by using a systematic design and metabolic engineering based on the metabolic pathway of LNT. The lgtA (encoding β-1,3-N-acetylglucosaminyltransferase) and wbgO (encoding β-1,3-galactosyltransferase) genes were introduced into the engineered E. coli BL21(DE3) to construct an LNT-producing starting strain B1 (0.22 g/L). Then, the genes related to the LNT metabolic pathway were screened in two vectors to evaluate LNT synthesis. The lgtA-wbgO and galE-galT-galK genes were overexpressed through the two-plasmid system in E. coli BL21(DE3). The titer of LNT (3.42 g/L) had a gain of 14.55 times compared with that of B1. Furthermore, the ugd gene, which was associated with the UDP-Gal bypass pathway, was inactivated to further improve LNT production in shake-flask cultivation (4.14 g/L). The final fed-batch cultivation of the engineered strain produced 31.56 g/L of LNT. This study provided a strategy for the effective production of LNT in E. coli.

中文翻译:

工程大肠杆菌用于乳酸-N-四糖的高效生物合成

-N-四糖(LNT)是人乳寡糖家族的一员,因其对婴儿健康的重要性而受到广泛关注。我们在大肠杆菌BL21(DE3)中构建了一种全细胞生物转化方法,用于高滴度LNT合成。该方法是通过使用基于 LNT 代谢途径的系统设计和代谢工程来进行的。将lgtA(编码β -1,3- N-乙酰氨基葡糖转移酶)和wbgO(编码β-1,3-半乳糖基转移酶)基因引入工程大肠杆菌BL21(DE3) 以构建产生 LNT 的起始菌株 B1 (0.22 g/L)。然后,在两个载体中筛选与 LNT 代谢途径相关的基因,以评估 LNT 合成。lgtA - wbgOgalE - galT - galK基因通过大肠杆菌BL21(DE3)中的双质粒系统过表达。LNT的效价(3.42 g/L)与B1相比提高了14.55倍。此外,UGD与 UDP-Gal 旁路途径相关的基因被灭活,以进一步提高摇瓶培养中的 LNT 产量(4.14 g/L)。工程菌株的最终补料分批培养产生了 31.56 g/L 的 LNT。该研究为在大肠杆菌中有效生产 LNT 提供了策略。
更新日期:2022-06-22
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