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arXiv 2303.09466cond-mat.softphysics.chem-ph
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水中DNA对高能质子辐射的电子激发响应

Electronic Excitation Response of DNA to High-energy Proton Radiation in Water

Christopher Shepard, Dillon Yost, Yosuke Kanai

摘要:

缺乏对DNA对带电粒子辐射(如高能质子)的电子激发响应的分子水平理解,仍然是推进质子和其他离子束癌症治疗的基本科学瓶颈。特别是,不同类型的DNA损伤对高能质子的依赖性代表了一个重要的知识空白。在这里,我们采用第一性原理实时依赖于时间的密度泛函理论模拟,使用一个并行的超级计算机,解开能量转移的量子力学细节从高能质子到DNA在水中。计算结果表明,质子沉积在DNA糖磷酸侧链上的能量比沉积在核碱基上的能量多得多,并且预计在DNA侧链上的能量转移比在水上的能量转移大。作为这种电子停止过程的结果,在DNA侧链上产生高能空穴作为氧化损伤的来源。

英文摘要:

The lack of molecular-level understanding for the electronic excitation response of DNA to charged particle radiation, such as high-energy protons, remains a fundamental scientific bottleneck in advancing proton and other ion beam cancer therapies. In particular, the dependence of different types of DNA damage on high-energy protons represents a significant knowledge void. Here we employ first-principles real-time time-dependent density functional theory simulation, using a massively-parallel supercomputer, to unravel the quantum-mechanical details of the energy transfer from high-energy protons to DNA in water. The calculations reveal that protons deposit significantly more energy onto the DNA sugar-phosphate side chains than onto the nucleobases, and greater energy transfer is expected onto the DNA side chains than onto water. As a result of this electronic stopping process, highly energetic holes are generated on the DNA side chains as a source of oxidative damage.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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