核糖核酸的热扰动微分光谱。II. 近邻相互作用。
Thermal perturbation differential spectra of ribonucleic acids. II. Nearest neighbour interactions.
作者信息
Frechet D, Ehrlich R, Remy P, Gabarro-Arpa J
出版信息
Nucleic Acids Res. 1979 Dec 11;7(7):1981-2001. doi: 10.1093/nar/7.7.1981.
Abstract
Dinucleoside monophosphates are used here as models for studying sequence dependence of the hypochromic effect correlated with base stacking. It was shown that once the contribution due to the temperature dependent hydration change of the bases is substracted from the thermal perturbation difference spectra of dinucleoside monophosphates, the absorbance change of the dimer only due to unstacking of the bases could be obtained. In order to be able to use these corrected thermal perturbation difference spectra as models for studying nearest neighbour interactions in nucleic acids, it was necessary to normalize them to 100% unstacking of the bases. To perform this normalization, apparent thermodynamic parameters were extracted from the corrected transition curves by means of the two-state model.
摘要
二核苷单磷酸在此用作研究与碱基堆积相关的减色效应的序列依赖性的模型。结果表明，一旦从二核苷单磷酸的热扰动差光谱中减去由于碱基的温度依赖性水合变化所产生的贡献，就可以得到仅由于碱基解堆积而导致的二聚体吸光度变化。为了能够将这些校正后的热扰动差光谱用作研究核酸中最近邻相互作用的模型，有必要将它们归一化为碱基100%解堆积的情况。为了进行这种归一化，通过二态模型从校正后的转变曲线中提取表观热力学参数。
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