静电合如何在氨酸激酶中实现形态可塑性
Cheng-Chieh Tsai1, Zhi Yue1, Jana Shen1
1Department of Pharmaceutical Sciences , University of Maryland School of Pharmacy , Baltimore , Maryland 21201 , United States.
Journal of the American Chemical Society
|September 4, 2019
概括
质子合动力学驱动酶结构变化,揭示了设计选择性酶抑制剂的新策略. 对于未来的药物发现, 了解这些依赖于质子化的运动是关键.
科学领域:
- 生物化学
- 结构生物学
- 计算生物学
背景情况:
- 蛋白激酶在细胞信号和疾病中至关重要,表现出复杂的结构灵活性.
- 了解酶结构动态对于开发向疗法至关重要.
- 由于这种固有的可塑性, 目前的药物发现方法面临挑战.
研究的目的:
- 使用分子动力学探索c-Src激酶的构造格局.
- 研究质子化状态在酶结构变化的作用.
- 为药物设计确定新的中间状态.
主要方法:
- 在c-Src激酶上进行了质子合分子动力学模拟.
- 在没有预先定义的目标,突变或偏见的情况下, 模拟探索了形态状态.
- 分析了关键的残留质子状态及其对形状的影响.
主要成果:
- 捕获了所有主要的激酶构造状态,包括非活性和活性形式.
- 发现关键残留物 (DFG-Asp,αC-Glu,HRD-Asp) 的质子化状态取决于形状.
- 发现了一种新型的DFG-out/α-C中间状态,涉及与催化Lys的盐桥.
结论:
- 质子合是基因酶形态可塑性的关键机制.
- 已识别的中间状态为选择性抑制剂设计提供了新的机会.
- 考虑质子合动力学可以彻底改变计算激酶研究和药物发现.
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