作为聚合膜的动质体 DNA 的聚合物物理学
The Polymer Physics of Kinetoplast DNA as a Polymerised Membrane
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中文总结 AI 辅助
研究动质体 DNA（kDNA）的构象和动力学性质，提出用聚合膜物理学描述其大规模行为，分析流体动力学相互作用，证明动力学标度情景能统一捕获实验数据，并估计了面内弹性模量。
中文摘要 AI 辅助
我们分析了动质体 DNA（kDNA）的构象和动力学性质，它是一种由数千个环状 DNA 分子构成的巨大片状结构，存在于某些寄生虫的线粒体中。环状 DNA 分子通过拓扑连接实现连通性，因此 kDNA 可被视为一种天然存在的二维奥林匹克凝胶，其物理性质尚待了解。我们提出 kDNA 大规模行为的基本方面可用聚合膜物理学来描述。我们的分析表明流体动力学相互作用在 kDNA 水溶液动力学中的相关性。我们证明预测的动力学标度情景以统一方式捕获了最近从体外成像实验获得的各种实验数据。我们还对 kDNA 的面内弹性模量进行了估计，其大小与最近的测量结果吻合良好。
英文摘要
We analyze the conformational and dynamical properties of the kinetoplast DNA (kDNA), a massive sheet-like structure made from thousands of circular DNA molecules, found in the mitochondrion of certain parasites. The connectivity between circular DNA molecules is achieved by topological linking, hence, the kDNA may be regarded as a naturally occurring two-dimensional version of Olympic gels, whose physical properties are yet to be understood. We propose that the basic aspects in the large scale behaviors of kDNA could be described by the physics of polymerized membrane. Our analysis indicates the relevance of the hydrodynamic interactions in the dynamics of kDNA in aqueous solution. We demonstrate that the predicted dynamical scaling scenario captures various experimental data recently obtained from {\it in vitro} imaging experiments in a unified manner. We also provide an estimate for the in-plane elastic modulus of kDNA, whose magnitude agrees well with recent measurements.
