Unraveling the Thermodynamics of the Folding and Interconversion of Human Telomere G-Quadruplexes.

Unraveling the Thermodynamics of the Folding and Interconversion of Human Telomere G-Quadruplexes.
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DOI:
10.1002/anie.201605350
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发表时间:
2016-08-22
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Lah J
Lah J
中科院分区:
其他
文献类型:
--
作者:
Bončina M;Vesnaver G;Chaires JB;Lah J

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为什么人类端粒DNA片段折叠成不同的G-四链体结构,具有平行,杂交和反平行链方向取决于温度和浓度的共溶质仍然知之甚少。类似地,中间结构沿着它们的折叠或相互转化途径的形成也没有很好地理解。在这里,我们通过引入一个概念框架来解决这些问题,基于DSC和CD光谱数据的全局热力学分析,这使我们能够提供人类端粒片段5′-AGGG(TTAGGG)3-3′(Tel 22)稳定性的拓扑相空间(相图)的详细描述。该框架阐明了在宽范围的温度和离子(K+,Na+)和聚乙二醇(PEG)浓度的四链体折叠和相互转化过程的驱动力,并证明了它们与人类端粒DNA结构特征的联系。
Why human telomere DNA fragments fold into different G-quadruplex structures with parallel, hybrid and antiparallel strand orientations depending on the temperature and concentration of cosolutes remains poorly understood. Similarly, the formation of intermediate structures along their folding or intercoversion pathways is not well understood. Here we address these questions by introducing a conceptual framework, based on the global thermodynamic analysis of DSC and CD spectroscopy data, which enables us to provide a detailed description of the topological phase space (phase diagram) of the stability of the human telomere fragment 5′-AGGG(TTAGGG)3-3′ (Tel22). This framework clarifies the driving forces of quadruplex folding and interconversion processes over a wide range of temperatures and ion (K+,Na+) and polyethylene glycol (PEG) concentrations and demonstrates their linkage to the human telomere DNA structural features.
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