溶性环氧化酶的反应机制:从分子动力学模拟的见解
Birgit Schiøtt1, Thomas C Bruice
1Department of Chemistry, Aarhus University, 8000 Aarhus, Denmark. birgit@chem.au.dk
Journal of the American Chemical Society
|December 6, 2002
概括
分子动力学模拟揭示了可溶性环氧化酶 (sEH) 如何催化反应. 一种质子化胺对于活性位点的稳定性至关重要,而Tyr465通过键引导基质的区域选择性.
科学领域:
- 生物化学 生物化学
- 计算化学计算化学
- 酶学 是一种酶学.
背景情况:
- 溶性环氧化酶 (sEH) 在将环氧化物代谢成邻近的二醇中发挥着至关重要的作用.
- 了解sEH的催化机制对于药物开发和生物化学研究至关重要.
研究的目的:
- 通过分子动力学模拟,阐明可溶性环氧化酶 (sEH) 的催化机制.
- 为了研究基质结合,活性部位残留作用和反应动态.
主要方法:
- 用1S,2S-跨甲基氧化物对sEH进行了分子动力学模拟.
- 分析了基质结合形状,活性点质子化状态和结合相互作用.
- 研究了集体域运动及其与催化机制的关系.
主要成果:
- 确定了一种首选的基质结合形态,涉及Tyr381和His523.3之间的pi-sandwiching.
- 确定一个质子化胺对活性部位的完整性至关重要.
- 观察到近攻击符合者 (NACs) 占5.3%的时间,核友性攻击主要发生在C(1).
- 发现Tyr465与基质氧的键对于区域选择性和反应物分离至关重要.
- 确定了在区和催化三位一体之间存在的反相关的集体域运动.
结论:
- 该研究提供了对sEH催化机制的详细见解,突出了关键的残留物相互作用和动态.
- Tyr465的键对于控制区域选择性至关重要,而质子化His523保持了活性位点的稳定性.
- 集体域动作可能在将近攻击符合者转换为过渡状态方面发挥作用.
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