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作为单氧基酶中可能的中间体模型的铜 (III) -复合物
Benjamin D Neisen1, Nicole L Gagnon1, Debanjan Dhar1
1Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota , 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States.
Journal of the American Chemical Society
|July 20, 2017
概括
研究人员合成了具有[CuOOR]2+核心的新型铜复合物,代表了正式的Cu(III) 氧化状态. 这一发现为酶中的这种核心提供了第一个先例,
科学领域:
- 生物有机化学
- 有机金属化学
- 酶机制
背景情况:
- 含铜的酶在生物氧化反应中起着至关重要的作用.
- 了解这些酶的活性位点是阐明它们的催化机制的关键.
- 之前的研究集中在Cu (II) 和Cu (I) 状态,在相关复合体中对较高的氧化状态的探索有限.
研究的目的:
- 合成和描述新的铜物种.
- 研究这些具有弱OH键的物种的反应性.
- 在生物相关复合体中建立更高铜氧化状态的先例.
主要方法:
- 铜氧化物前体与氧化物 (ROOH) 的反应.
- 反应产物的光谱鉴定,包括新型[CuOOR]2+物种.
- 支持结构和电子表征的理论计算.
- 铜氧化物产品的独立合成和表征.
主要成果:
- 从[NBu4][LCuIIOH]和多余的ROOH中合成[NBu4][LCuIIOOR]复合物.
- 通过一电子氧化产生和表征新的[CuOOR]2+物种 (正式称为Cu(III) OOR).
- 通过形成LCu(OPhNMe2) 来证明具有弱O-H键的反应性.
- 光谱和理论证据证实了Cu (III) 的氧化状态.
结论:
- 这项研究为合成复合物中的CuOOR2+核,一种正式的CuIII物种提供了第一个先例.
- 这一发现对了解铜单氧酶酶的机制具有重要意义.
- 这些发现为设计氧化反应的生物启发催化剂开辟了新的途径.
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