代谢工程与适应性实验室进化用于由Corynebacterium glutamicum生产氨酸
Yukio Tachikawa1, Miki Okuno2, Takehiko Itoh3
1School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, Kanagawa 226-8501, Japan.
Journal of bioscience and bioengineering
|February 16, 2024
概括
适应性实验室进化产生了对4-甲氨酸耐药的Corynebacterium glutamicum突变体. 这些突变,具有特定的基因突变,增强芳香氨基酸的生产,特别是氨酸.
科学领域:
- 微生物学 微生物学
- 代谢工程是代谢工程.
- 生物技术是生物技术.
背景情况:
- 谷氨酸菌 (Corynebacterium glutamicum) 是一种用于氨基酸生产的关键微生物.
- 石基胺通路对于合成芳香氨基酸至关重要.
- 适应性实验室进化 (ALE) 是一种强大的品种改进工具.
研究的目的:
- 为了获得Corynebacterium glutamicum的4 - 基氨酸 (4FP) 耐药突变菌.
- 为了确定导致4FP耐药性和增强芳香氨基酸生产的突变.
- 将这些发现应用于C. glutamicum的代谢工程,以生产氨酸.
主要方法:
- 适应性实验室进化 (ALE) 用于选择4FP耐药性.
- 基因分析确定了aroG,pheA和aroP基因中的突变.
- 代谢工程涉及野生型C. glutamicum菌株的基因过度表达和删除.
主要成果:
- 在aroG,pheA和aroP中的突变赋予了4FP耐药性.
- 这些突变导致了超级生物中芳香氨基酸的较高积累.
- 突变的aroG和pheA的过度表达,以及aroP的缺失,导致6.11±0.08gL-1.1的氨酸产量.
结论:
- ALE对于发现对代谢工程有益的突变是有效的.
- 在C. glutamicum中进行有针对性的基因改造可以显著提高氨酸的产生.
- 鉴定的突变为改善芳香氨基酸生物合成提供了有价值的标.
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