一个pH依赖的形DNA三螺旋纳米开关的模拟和实验性表征
Federico Iacovelli1, Andrea Idili1, Alessandro Benincasa1
1Department of Biology and ‡Department of Chemistry, University of Rome, Tor Vergata , 00173 Rome, Italy.
Journal of the American Chemical Society
|April 4, 2017
概括
这项研究表明pH触发的DNA三重螺旋可逆转换状态. 这种响应性DNA结构在较低的pH值下显示出增强的稳定性,经过实验和模拟方法的结合验证.
科学领域:
- 生物化学
- 分子生物学
- 纳米技术
背景情况:
- DNA纳米结构为响应性设备提供了潜力.
- 在受控的分子相互作用中,pH触发机制至关重要.
研究的目的:
- 描述pH触发的DNA三环的结构和动态行为.
- 为了验证DNA结构的可逆切换机制.
- 调查胡格斯相互作用在DNA稳定中的作用.
主要方法:
- 将实验技术 (光,尿素展开) 与分子动力学 (MD) 模拟相结合.
- 在pH值5.0和8.0下进行MD模拟,以模拟质子和无质子细胞蛋白.
- 使用MM/GBSA进行免费能源计算.
主要成果:
- 光数据证实在pH值变化时可以在两个状态之间进行可逆切换.
- MD模拟显示了胡格斯相互作用在稳定DNA三环中发挥的关键作用.
- 与pH8.0相比,尿素展开的实验和计算显示了pH5.0的稳定能量高出2倍.
结论:
- 设计的DNA结构表现出经过验证的pH控制的响应行为.
- 结合实验和模拟方法对基于DNA的纳米设备的特征是有效的.
- 胡格斯相互作用是DNA三重螺旋的pH依赖稳定性的关键.
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