吉布斯自由能量的变化调节了拓酶-IB的活动:一个分子动力学和MM/GBSA研究
Muralidhar1, Rakesh Kumar Tiwari1, Vipin Kumar Mishra2
1Department of Physics, Deen Dayal Upadhyay Gorakhpur University, Gorakhpur, India.
Journal of biomolecular structure & dynamics
|February 16, 2026
概括
人类拓聚酶-IB酶使用基布斯从氨基酸中获得的自由能量来稳定DNA断裂. 氨酸-318对于DNA处理和细胞过程中的酶构成变化至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 人类拓酶-IB (Topo-IB) 在重要的细胞过程中对缓解DNA扭曲应激至关重要.
- 托波-IB的功能是暂时断开一个DNA链,形成酸化氨酸中间体.
- 关于吉布斯自由能量在Topo-IB的催化活动中的作用,仍然存在一些基本问题.
研究的目的:
- 通过计算模拟,阐明了Topo-IB活动的基础结构机制.
- 调查吉布斯自由能量对Topo-IB酶功能的贡献.
- 了解特定氨基酸,如Lys-318在酶的催化机制中的作用.
主要方法:
- 600 ns的分子动力学模拟.
- 分子力学与一般化天生的表面积 (MM/GBSA) 的计算.
- 酶-DNA相互作用和形状变化的分析.
主要成果:
- 特定氨基酸的吉布斯自由能量对于产生极性溶解能量至关重要,稳定了Topo-IB活动.
- 氨基酸Lys-318在受控的DNA旋转机制中起着重要作用.
- 酶-DNA合作在DNA处理过程中促进了大量的结构变化.
结论:
- 这项研究揭示了吉布斯自由能量和特定氨基酸残留在Topo-IB功能中的重要性.
- 这些发现突出了酶结构,动力学和DNA处理之间的复杂相互作用.
- 结果为未来对IB型酶的研究和抗药物策略的开发提供了洞察力.
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