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Vibrational dynamics of DNA : IV. Vibrational spectroscopic characteristics of A-, B-, and Z-form DNA's

机译:DNA的振动动力学:IV。 A,B和Z型DNA的振动光谱特征

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Linear and nonlinear IR spectroscopic studies of nucleic acids can provide crucial information on solution conformations of DNA double helix and its complex with other molecules. Carrying out density functional theory calculations of A-, B-, and Z- form DNA's, the authors obtained vibrational spectroscopic properties as well as coupling constants between different basis modes. The vibrational couplings that determine the extent of exciton delocalization are strongly dependent on DNA conformation mainly because the interlayer distance between two neighboring base pairs changes with respect to the DNA conformation. The Z- DNA has comparatively small interlayer vibrational coupling constants so that its vibrational spectrum depends little on the number of base pairs, whereas the A- DNA shows a notable dependency on the size. Furthermore, it is shown that a few distinctively different line shape changes in both IR and two-dimensional IR spectra as the DNA conformation changes from B to A or from B to Z can be used as marker bands and characteristic features distinguishing different DNA conformations. (c) 2007 American Institute of Physics.
机译:核酸的线性和非线性IR光谱研究可提供有关DNA双螺旋及其与其他分子的复合物的溶液构象的重要信息。进行A,B和Z形式DNA的密度泛函理论计算,作者获得了振动光谱特性以及不同基础模式之间的耦合常数。确定激子离域程度的振动耦合主要取决于DNA构象,这主要是因为两个相邻碱基对之间的层间距离相对于DNA构象而变化。 Z-DNA具有相对较小的层间振动耦合常数,因此其振动谱几乎不依赖于碱基对的数目,而A-DNA则显示出对大小的显着依赖性。此外,显示出当DNA构象从B改变为A或从B改变为Z时,IR和二维IR谱中的一些明显不同的线形变化可以用作区分不同DNA构象的标记带和特征。 (c)2007年美国物理研究所。

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