arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1106.2632cond-mat.stat-mechphysics.bio-ph
收藏

B-DNA纤维的结构相关性和熔融

Structural correlations and melting of B-DNA fibres

Andrew Wildes, Nikos Theodorakopoulos, Jessica Valle Orero, Santiago Cuesta-Lopez, Jean-Luc Garden, Michel Peyrard

摘要:

尽管有许多尝试,DNA的热变性的理解仍然是一个挑战,由于缺乏在过渡的结构数据,因为标准的实验方法,DNA解链是在溶液中,不提供空间信息。我们报告了一个测量使用中子散射定向DNA纤维,以确定在双螺旋构象的熔融温度接近从下面的区域的大小。观察到B型DNA的布拉格峰随温度的变化,并测量了其宽度和积分强度。这些结果,补充了差示量热法研究B DNA纤维的熔化以及电泳和光学观察数据,分析在一维介观模型的DNA。

英文摘要:

Despite numerous attempts, the understanding of the thermal denaturation of DNA is still a challenge due to the lack of structural data at the transition since standard experimental approaches to DNA melting are made in solution and do not provide spatial information. We report a measurement using neutron scattering from oriented DNA fibres to determine the size of the regions that stay in the double-helix conformation as the melting temperature is approached from below. A Bragg peak from the B-form of DNA has been observed as a function of temperature and its width and integrated intensity have bean measured. These results, complemented by a differential calorimetry study of the melting of B DNA fibres as well as electrophoresis and optical observation data, are analysed in terms of a one-dimensional mesoscopic model of DNA.

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。

↑