一个针对F/G区域的结构导向工程策略增强了三胺5-基酶活性,以有效地产生血清素
Ling Gao1, Pengling Wei1, Wenzhao Xu1
1The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, PR China.
International journal of biological macromolecules
|November 19, 2025
概括
研究人员设计了胺5-基酶 (T5H) 酶,以克服微生物血清素生产中的瓶. 这种结构导向的方法显著增强了酶活性,并使色胺的有效生物制造成为可能.
科学领域:
- 生物催化和酶工程 生物催化和酶工程
- 代谢工程和合成生物学
- 自然产品的生物合成.
背景情况:
- 胺5-基酶 (T5H) 是微生物血清素生物合成的关键酶,但其活性较低,限制了绿色生产方法.
- 目前的血清的化学合成途径比生物替代品更不可持续.
- 由于复杂的结构约束,为增强活性而设计P450酶具有挑战性.
研究的目的:
- 开发一个结构导向的工程策略,以提高T5H的催化效率,用于微生物的血清素生产.
- 创建一个高效的生物制造平台,用于从L-三酸生产血清素.
- 通过固态调制建立一个可通用的范式,用于通过固态调制来设计P450酶.
主要方法:
- 结构引导的酶工程针对T5H的F/G螺旋区域.
- 利用AlphaFold3建模和CAVER道分析用于合理的突变设计.
- 采用代优化,分子动力学模拟和大肠杆菌细胞工厂集成用于生物生产.
主要成果:
- 开发了一种过度活跃的T5H变体 (E166K/V220E),其特定酶活性增加了25倍,并提高了NADPH合效率.
- 分子动力学揭示了扩展的基质通道和更短的基质-血距离作为增强活性的关键机制.
- 在使用工程化大肠杆菌细胞工厂的食批发发酵中实现了创纪录的21.4g/L的血清素产量.
结论:
- 开发的结构导向工程策略有效地提高了T5H活动和基板可访问性.
- 这项工作建立了一个高效和可扩展的血清素生物制造平台.
- F/G螺旋式硬度调制方法为工业生物催化剂中P450酶工程提供了可通用的方法.
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