对自给自足的黄素依赖原酶的结构和功能洞察力.
Longhai Dai1, Hao Li1, Si Dai1
1State Key Laboratory of Biocatalysis and Enzyme Engineering, Hubei Hongshan Laboratory, Hubei Collaborative Innovation Center for Green Transformation of Bio-Resources, Hubei Key Laboratory of Industrial Biotechnology, School of Life Sciences, Hubei University, Wuhan 430062, PR China.
International journal of biological macromolecules
|January 12, 2024
概括
黄素依赖酶 (FDHs) 是合成化学的关键. 研究人员阐明了单一成分FDH,AetF的机制,揭示了其对化托的结构和催化活性.
科学领域:
- 生物化学 生物化学
- 合成化学 合成化学
- 结构生物学 结构生物学
背景情况:
- 黄素依赖酶 (FDHs) 是多功能酶,在合成化学中具有重要的应用.
- 像AetF一样,单组件FDHs在一个多链内具有酶和还原酶活动.
- AetF显示出广泛的基质杂交性,催化了l-酸 (l-Trp) 连续化为5-酸 (5-Br-Trp) 和5,7-二酸-l-酸 (5,7-二酸-Trp).
研究的目的:
- 阐明单组分黄素依赖原酶AetF.的催化机制.
- 确定AetF与其辅因子和基质中间体复合的晶体结构.
- 了解AetF的基板灵活性和二化能力的结构基础.
主要方法:
- 使用X射线晶体学来解决AetF的晶体结构.
- 用FAD,FAD/NADP+,FAD/l-Trp和FAD/5-Br-Trp来确定结构的复杂性.
- 结构分析的重点是基质结合口袋拓和残留物相互作用.
主要成果:
- 晶体结构揭示了一个前所未有的拓为单组件FDH.
- 在AetF中的一个宽的基质结合口袋有助于其基质灵活性和二化能力.
- 基质识别残留物和5-Br-Trp之间的特定相互作用网络对于二化至关重要.
- 工程设计的AetF的Ala变体实现了>98%的C5-区域选择性对于l-Trp单化.
结论:
- 这项研究提供了对单组件FDH活动的第一个详细的机制性见解.
- 这些发现为了解AetF的催化机制和区域选择性提供了结构性基础.
- 这项工作促进了蛋白质工程的努力,在生物催化化中开发高效的FDH.
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