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在细胞染色体P450eryFF激活过程中的质子转移动态
Victor Guallar1, Danni L Harris, Victor S Batista
1Department of Chemistry, University of California, and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Journal of the American Chemical Society
|February 14, 2002
概括
细胞染色体P450eryF (CYP107A1) 在其激活途径中利用超快速的质子转移. 这种与氧铁还原相关的质子转移突显了键网络在酶功能中的关键作用.
科学领域:
- 生物化学 生物化学
- 计算化学的计算化学
- 酶学 是一种酶学.
背景情况:
- 细胞染色体P450s (CYPs) 是参与氧化反应的关键酶.
- 在CYP中氧化激活的机制,特别是从氧铁化物转化为铁物种 (化合物I),仍然不完全理解.
- 细胞染色体P450eryF (6-deoxyerythronolide B化酶;CYP107A1) 作为研究这些基本过程的模型系统.
研究的目的:
- 为了研究细胞染色体P450eryF.的短暂激活途径中的质子转移事件.
- 阐明水分子和结在CYP酶机制中的作用.
- 为了理解质子转移动态和氧铁态的减少之间的联系.
主要方法:
- 结合分子动力学模拟与量子化学计算.
- 计算的瞬间质子转移能量概况.
- 在CYP107A1.1.中分析了从氧铁性物种到铁氧氧物种 (化合物I) 的过渡途径.
主要成果:
- 确定了从水分子W519到与血红素结合的远端氧的超快质子转移.
- 随后观察到从W564到W519的质子转移.
- 发现这两种质子转移事件在氧铁态中都是内热的,将它们与还原过程联系起来.
结论:
- 在O(2) 结合裂附近的键网络对于P450s的酶激活至关重要.
- 质子转移动态在机制上与CYP107A1.1.中的氧铁性减少有关.
- 这些发现与关于CYP突变和酶疗效的实验观察一致.
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