从Bacillus aryabhattai通过Bacillus subtilis的非经典蛋白质分泌途径有效分泌自然细胞内β-银酸酶的表达
1College of Light Industry and Food Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China.
International journal of biological macromolecules
|July 15, 2023
概括
细菌细菌通过非经典的途径有效分泌细胞内β-银酸酶 (lacZBa),实现高产量和提高酶稳定性. 这种方法绕过了传统的信号,提高了细胞外酶的产生.
科学领域:
- 生物技术是生物技术.
- 酶工程是什么? 酶工程是什么?
- 微生物生理学 微生物生理学
背景情况:
- 细胞内酶通常需要复杂的工程来进行细胞外分泌.
- 使用信号的传统分泌途径 (Sec, Tat) 产生了低水平的β-银酸酶 (lacZBa).
- 探索替代分泌途径对于高效的酶生产至关重要.
研究的目的:
- 为了实现从Bacillus aryabhattai在Bacillus subtilis中获得细胞内β-银酸酶 (lacZBa) 的有效的细胞外分泌.
- 调查非经典分泌途径对酶生产的潜力.
- 为了优化表达条件,最大限度地提高细胞外酶产量.
主要方法:
- 在有或没有信号的 Bacillus subtilis 中表达 lacZBa.
- 酶活性,分泌率,pH值和热稳定性的表征.
- 优化发酵介质使用单因素实验和响应表面方法.
主要成果:
- 没有信号的非经典分泌产生5.3U/mL,比信号介导分泌 (0.54U/mL) 显著改善.
- 与大肠杆菌相比,通过非经典途径分泌的酶表现出增强的抗酸性,pH稳定性和热稳定性.
- 优化的摇瓶条件导致细胞外酶活性增加了32.2倍,达到17.41 U/mL.
结论:
- 细菌可以有效地通过非经典途径分泌细胞内lacZBa,而无需信号.
- 这种新的方法显著提高了酶产量和稳定性.
- 优化过程为工业酶生产提供了一个有前途的战略.
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