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对类异构酶的计算研究:从酶结合基质和中间体的分子动力学模拟的见解
Devleena Mazumder1, Kalju Kahn, Thomas C Bruice
1Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, CA 93106, USA.
Journal of the American Chemical Society
|June 19, 2003
概括
分子动力学模拟支持Delta(5)-3-Ketosteroid Isomerase (KSI) 的合作性键机制. 这种酶是这种酶.
科学领域:
- 生物化学 生物化学
- 酶学 是一种酶学.
- 计算生物学 计算生物学
背景情况:
- 德尔塔(5) -3-类固醇异构酶 (KSI) 催化在扩散极限附近的类固醇异构化.
- 该酶的催化机制,特别是一般酸催化作用,仍在争论中.
- 拟议的机制包括催化或合作性键系统.
研究的目的:
- 为了研究Delta(5)-3-Ketosteroid异构酶 (KSI) 的催化机制.
- 用分子动力学模拟来区分拟议中的催化机制.
主要方法:
- 进行了1.5纳秒分子动力学 (MD) 模拟.
- 模拟包括酶结合基质 (E.S) 和酶结合中间体 (E.In) 状态.
- 该系统在TIP3P水箱中溶解.
主要成果:
- 模拟MD强烈支持一个合作的键机制.
- 关键残留物Tyr14和Asp99与基质/中间体形成键.
- 活动地点的水动力学发生变化,由于疏水性残留物运动,E.In综合体中的水被排除在外.
结论:
- 这项研究提供了强有力的证据,证明KSI.中存在一种合作性键机制.
- 活性部位的动态变化,包括水排斥,对于催化是至关重要的.
- 计算模拟为酶机制提供了有价值的见解.
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