通过调节细胞内NADH水平来增强Bacillus subtilis Z2的细胞酶生物合成
1Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, College of Bioengineering, Chongqing University, Chongqing 400030, China.
iScience
|April 25, 2025
概括
研究人员通过增强NAD+生物合成和NADH再生,优化了Bacillus subtilis中的细胞酶生物合成. 这导致了显著增加的酶活性,这对于林氏纤维素生物质转化至关重要.
科学领域:
- 生物技术是生物技术.
- 分子生物学分子生物学
- 酵素工程是什么? 酶工程是什么
背景情况:
- 在Bacillus subtilis中优化细胞酶生物合成对于高效的纤维素生物质转化至关重要.
- 细胞内NAD (H/+) 水平与细胞酶产生之间的调节联系尚不清楚.
研究的目的:
- 阐明连接细胞内NAD (H/+) 水平与Bacillus subtilis细胞酶生产的调节机制.
- 通过针对NAD+生物合成和NADH再生的代谢工程策略来提高细胞酶产量.
主要方法:
- 在Bacillus subtilis Z2.2.中对13个参与NAD+代谢的基因进行系统选.
- 应用模块化工程策略,以重定向代谢流量,以增强NAD+生物合成和NADH再生.
- 使用对抗剂治疗和基因删除进行实验验证,以确认调节途径.
主要成果:
- 确定用于NAD+代谢的关键基因 (ycel, nadV, nadM, mdh, sucB).
- 鉴定的基因的共同表达导致细胞内NADH水平增加了13.09倍.
- 细胞酶活性显著增强:FPase的2.24倍,CMCase的2.04倍.
结论:
- 代谢工程的NAD +生物合成和NADH再生有效地提高细胞酶的生产在Bacillus subtilis.
- 信号通路在调节细胞质基因过度表达的过程中起着至关重要的作用,以应对升高的NAD (H/+) 水平.
- 这项研究为改进林氏纤维素生物质转化中的酶性产量提供了基础.
相关概念视频
Cellulose and Pectic Polysaccharides
3.4K
Every plant cell has a cell wall that protects the cell, provides structural support, and gives the cell shape. Cellulose, the main structural component of the plant cell wall, makes up over 30% of plant matter. It is the most abundant organic compound on earth. Cellulose is an unbranched polysaccharide composed of linear chains of glucose molecules linked by β (1→4) glycosidic bonds.
As a cell matures, its cell wall specializes according to its type. For example, the...
As a cell matures, its cell wall specializes according to its type. For example, the...
3.4K
Role of Microtubules in Cell Wall Deposition
2.3K
Microtubules are small hollow tubes in eukaryotic cells. The cell wall microtubules are polymerized dimers of two globular proteins, α-tubulin and β-tubulin, two globular proteins. With a diameter of about 25 nm, microtubules are the widest components of the cytoskeleton. They help the cell resist compression and provide a track along which vesicles move through the cell or pull replicated chromosomes to opposite ends of a dividing cell. Microtubules go through quick cycles of...
2.3K


