工程大肠杆菌为高效的谷氨酸生产
Hiroki Mori1, Misato Matsui1, Takahiro Bamba2
1Agri-Bio Research Center, KANEKA CORPORATION, 1-8, Miyamae-cho, Takasago-cho, Takasago, Hyogo, 676-8688, Japan.
Metabolic engineering
|July 5, 2024
概括
改造大肠杆菌以产生高产量的谷氨,一种有价值的三. 这种新的发酵过程在没有氨酸补充的情况下实现了创纪录的22.0g/L氨,提供了工业潜力.
科学领域:
- 生物技术是生物技术.
- 代谢工程是代谢工程.
- 微生物发酵 微生物发酵
背景情况:
- 谷氨是一种重要的三,用于制药,食品和化品行业.
- 目前用于生产谷氨的酵母发酵方法遭受了细胞内积累,限制了产量.
- 大肠杆菌为高效的谷氨生物合成和分泌提供了一个有希望的替代宿主.
研究的目的:
- 为了设计大肠杆菌以产生高产量的细胞外谷氨.
- 为了优化发酵条件和基因修改以最大限度地提高谷甲位.
- 为了建立一个无氨酸的发酵过程,用于工业谷二的生产.
主要方法:
- 通过过度表达谷氨合成基因 (gshA,gshB) 来对大肠杆菌进行基因工程.
- 采用提高产量的策略,包括抑制降解,减弱吸收和促进氨酸合成.
- 使用料批发发酵,优化营养料 (硫酸,甘氨) 和补充剂 (硫酸).
主要成果:
- 工程化大肠杆菌菌株KG06的初始标位达到19.6g/L的谷氨.
- 代谢分析确定了O-乙胺转化为氨酸的转化为速度限制的步骤.
- 用硫酸补充剂增加了最终的谷氨标位,达到创纪录的22.0g/L.
- 在没有外源的氨酸添加的情况下,证明了成功的谷氨酸发酵.
结论:
- 开发了一种高效的大肠杆菌发酵平台,用于生产谷氨.
- 取得了迄今为止报告的最高谷氨标位,证明了重要的工业适用性.
- 这项研究提供了第一份关于大肠杆菌在不补充氨酸的情况下进行谷氨酸发酵的报告.
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