通过计算机辅助结构指导设计,调节P450BM3单氧化酶对N异环的N氧化选择性
Liu Yang1,2, Zhongji Pu3, Jianping Wu1,2
1Institute of Bioengineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou, 310058, China.
这项研究使用P450BM3酶工程来增强N-异环的N-氧化. 优化突变物实现高选择性和转化率,以实现高效的氧化合成.
科学领域:
- 生物催化剂是一种生物催化剂.
- 酶工程是什么? 酶工程是什么?
- 有机合成 有机合成
背景情况:
- N-异环的N-氧化对于天然产品的合成至关重要,但通常具有低效率和低区域选择性.
- 细胞染色体P450酶,特别是来自Bacillus megaterium的P450BM3,是氧化反应的关键生物催化剂.
研究的目的:
- 研究和增强P450BM3对N-异环化合物的N-氧化选择性潜力.
- 为了确定影响N-氧化选择性的P450BM3活性位点中的关键氨基酸残留物.
主要方法:
- 用位点和突变发生法来探测十二个活性位点氨基酸的功能.
- 进行了组合的活性部位和试验/代性和突变发生.
- 用分子动力学模拟来阐明反应机制.
主要成果:
- 热点残留物 (F87,A264,L75,V78,A328,I401,L437) 通过突变发生法被确定.
- 一种三重突变 (F87G/A264G/A328L) 使用素作为基质实现了99.0%的N-氧化选择性和99.3%的转化率.
- 通过模拟,揭示了一种涉及固态因素的"推拉"分子机制.
结论:
- 工程设计的P450BM3变种提供了一种高选择性高效的N-氧化物合成方法.
- 这项研究提供了有关P450BM3介导的N-氧化选择性的分子机制的宝贵见解.
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