B型DNA中腺嘌呤-鸟嘌呤错配的结构与热力学研究
Structural and thermodynamic studies on the adenine.guanine mismatch in B-DNA.
作者信息
Leonard G A, Booth E D, Brown T
机构信息
Department of Chemistry, University of Edinburgh, UK.
出版信息
Nucleic Acids Res. 1990 Oct 11;18(19):5617-23. doi: 10.1093/nar/18.19.5617.
Abstract
The structure of the synthetic dodecamer d(CGCAAATTGGCG) has been shown by single crystal X-ray diffraction methods to be that of a B-DNA helix containing two A(anti).G(syn) base pairs. The refinement, based on data to a resolution of 2.25 A shows that the mismatch base pairs are held together by two hydrogen bonds. The syn-conformation of the guanine base of the mismatch is stabilised by hydrogen bonding to a network of solvent molecules in both the major and minor grooves. A pH-dependent ultraviolet melting study indicates that the duplex is stabilised by protonation, suggesting that the bases of the A.G mispair are present in their most common tautomeric forms and that the N(1)-atom of adenine is protonated. The structure refinement shows that there is some disorder in the sugar-phosphate backbone.
摘要
通过单晶X射线衍射方法已表明，合成的十二聚体d(CGCAAATTGGCG)的结构为包含两个A(反式).G(顺式)碱基对的B-DNA螺旋结构。基于分辨率为2.25 Å的数据进行的精修表明，错配碱基对通过两个氢键维系在一起。错配中鸟嘌呤碱基的顺式构象通过与大沟和小沟中的溶剂分子网络形成氢键而得以稳定。一项pH依赖性紫外熔解研究表明，双链体通过质子化得以稳定，这表明A·G错配的碱基以其最常见的互变异构形式存在，且腺嘌呤的N(1)原子被质子化。结构精修显示，糖-磷酸主链存在一些无序状态。
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