一个循环德克斯主机/客户的方法,以化酶活性部位生物仿真腔
Michael L Singleton1, Joseph H Reibenspies, Marcetta Y Darensbourg
1Department of Chemistry, Texas A & M University, College Station, Texas 77845, USA.
Journal of the American Chemical Society
|June 12, 2010
概括
[FeFe]-酶活性位点的合成模型是使用环氧和2Fe2S复合物创建的. 这种超分子子改变了该复合体的结构和电化学特性,影响了质子减少.
科学领域:
- 生物有机化学 生物有机化学
- 超分子化学 超分子化学
- 电化学 电化学 电化学
背景情况:
- [FeFe]-酶的活性部位包含一个独特的2Fe2S集群,对其催化活性至关重要.
- 模仿酶的疏水活性部位环境是设计合成类似物的关键.
- 了解第二个协调球对催化功能的影响是必不可少的.
研究的目的:
- 通过使用环极素,制造[FeFe]-酶活性部位的合成类型.
- 研究将2Fe2S复合物封装在超分子中的结构和电化学效应.
- 为了评估这个模型系统对质子电催化还原的影响.
主要方法:
- 一个2Fe2S复合物的合成,该复合物与烯硫酸盐功能化.
- 形成一个与β-cyclodextrin分子的克拉酸复合物.
- 进行X射线晶体学以确定超分子复合体的结构.
- 电化学研究 (循环电压测量) 分析氧化还原特性和催化活性.
主要成果:
- X射线晶体结构揭示了封装复合体中角CO联体之间的扭转角度增加,表明典型的阴影几何形状的不稳定.
- 纳入环极的子导致Fe (I) Fe (I) /Fe (I) Fe (I) 的降解潜力大约发生80mV的变化.
- 由于超分子环境,二铁复合物的电催化质子还原潜力发生了变化.
结论:
- 环极素的超分子封装可以显著影响二铁复合物的结构和电子特性.
- 这种方法为调节合成酶模型的反应性提供了一种新的方法.
- 这项研究表明了第二个协调球在生物无机催化和人工酶设计中的重要性.
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