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研究报告

大肠杆菌生产莽草酸的基因工程菌构建

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  • 1.代谢控制发酵技术国家地方联合工程实验室,天津300457;2.天津科技大学生物工程学院,天津300457
韩 超(1993—),男,山东潍坊人,硕士研究生,研究方向为用谷氨酸棒杆菌代谢改造莽草酸途径,E-mail:871407470@qq.com

Construction of genetic engineering strains for production  of shikimic acid by Escherichia coli

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  • 1.National and Local United Engineering Lab of Metabolic Control Fermentation Technology,Tianjin 300457,China;
    2.College of Biotechnology,Tianjin University of Science and Technology,Tianjin 300457,China

摘要

莽草酸是芳香族氨基酸合成中的重要中间代谢物,可用于多种药物的化学合成.在代谢工程理论的指导下,构建积累莽草酸的高产菌株.通过构建敲除编码莽草酸激酶的基因aroL 与aroK的菌株阻断莽草酸的代谢;通过构建敲除编码奎尼酸/莽草酸脱氢酶的基因ydiB 的菌株减少副产物的合成;同时通过构建人工操纵子过表达编码DAHP合酶、莽草酸脱氢酶、脱氢奎尼酸脱水酶和三脱氢奎尼酸合酶的基因aroG,aroE,aroD 和aroB 以强化莽草酸合成途径.最终得到E.coliSHIKΔaroLΔydiB 菌株,摇瓶发酵能够积累莽草酸5.5g/L.

本文引用格式

韩 超,蔡灵芝,毛 倩,李燕军,谢希贤 . 大肠杆菌生产莽草酸的基因工程菌构建[J]. 发酵科技通讯, 2017 , 46(3) : 143 -146+187 . DOI: 10.16774/j.cnki.issn.1674-2214.2017.03.004

Abstract

Shikimic acid is an important intermediate for aromatic amino acids.It can be used as   building block for the chemical synthesis of various drugs.In this study,a high-yield shikimic
acid producing strain was constructed through metabolic engineering.The genes aroLand aroK    encoding the shikimate kinase were knocked out to block the shikimic acid catabolism and the    gene ydiBencoding the quinic/shikimate dehydrogenase was deleted to reduce the synthesis of   byproduct.The aroG,aroE,aroD and aroB genes encoding DAHP synthase,shikimic acid    dehydrogenase, dehydroquinic acid dehydratase and dehydroquinic acid synthase were    overexpressed with introduction of constructed operons,to strengthen the shikimic acid synthesis    pathway.Finally,the obtained E.coli SHIKΔaroLΔydiBengineering strain resulted in a yield of    shikimic acid of 5.5g/L by shake flask fermentation.
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