通过选择性有氧氧化反应的第二协调调节Fe-N-CSA酶的反应性氧介质
Yuan Xu1, Yuanjie Ma2, Xinghua Chen1
1School of Chemistry and Chemical Engineering, Medical School, Jiangsu Engineering Laboratory of Smart Carbon-Rich Materials and Device, Jiangsu Province Hi-Tech Key Laboratory for Bio Medical Research, Southeast University, Nanjing, 211189, China.
Angewandte Chemie (International ed. in English)
|June 19, 2024
概括
在单原子纳米酶 (SAzymes) 中调节活性氧物种 (ROS) 是至关重要的. Fe-N-C SA酶的硫功能化通过改变电子结构来增强活性和控制ROS通路.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 纳米技术纳米技术
背景情况:
- 控制活性氧物种 (ROS) 对于有氧反应中单原子纳米酶 (SAzymes) 的性能至关重要.
- 目前对SAzymes上ROS形成机制的理解有限,这阻碍了它们的实际应用.
- 细胞染色体P450为氧激活过程中ROS中间调节提供了一个模型.
研究的目的:
- 研究Fe-N-CSAzymes中的第二层协调如何影响ROS生产途径.
- 提高SAzymes在有氧氧化反应中的活性,选择性和稳定性.
- 通过电子结构修改阐明ROS调节背后的机制.
主要方法:
- 合成Fe-N-CSA酶与可调节的第二协调,包括硫功能化.
- 对氧化酶类反应的电化学表征和活性测试.
- 谱分析和理论计算 (例如,DFT) 来探测电子结构和反应机制.
主要成果:
- Fe-N-C SA酶的硫功能化显著增加了2.4倍的氧化酶类活性,归因于结合的Fe=O中间体.
- 自由ROS (超氧化基) 的生成被抑制到控制Fe-N-C样本的17%.
- 硫功能化改变了FeN4位点的电子结构,增加了费米水平的电子密度,并增强了向*OOH中间体的电子转移.
结论:
- 可调节的第二协调,特别是硫功能化,提供了一个有效的策略来调节Fe-N-CSAzymes中的ROS途径.
- 经过修改的电子结构促进了受控的有氧氧化,从而提高了催化性能.
- 这些发现为设计先进的SA酶提供了机械的理解,并为各种应用量身定制ROS调节.
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