一个ATP结合的DNA胺体的结构基础和亲和度的提高.
Yan Jiang1,2, Yuchao Zhang2, Liqi Wan2
1Molecular Science and Biomedicine Laboratory, State Key Laboratory of Chemo and Biosensing, College of Chemistry and Chemical Engineering, College of Biology, Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan 410082, China.
研究人员阐明了腺三酸盐 (ATP) 的DNA合体的结构和结合机制. 修改改进了ATP结合亲和力,使新的基于DNA的分子工具成为可能.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- DNA 体对小分子具有很高的亲和力,从而彻底改变了生物传感和生物成像.
- DNA 体1301b 显示高强度的腺三酸盐 (ATP) 结合 (Kd ~2.7 μM),但其结构基础是未知的.
研究的目的:
- 确定ATP的1301bDNA合体的结构基础和识别机制.
- 为了设计一种改进的DNA吸收体,具有增强的ATP结合亲和力.
主要方法:
- 溶液NMR光谱检测,以确定与ATP复合的缩短的体 (1301b_v1) 的三级结构.
- 结构导向设计包括2'-O-甲基修饰以增强结合亲和力.
主要成果:
- 1301b_v1-ATP复合体采用"L"形状,其中ATP结合在由内部循环形成的口袋中.
- ATP结合涉及与G14的结合以及与T8·A28和G9的pi堆叠相互作用.
- 观察到一种适应性结合机制,在ATP结合后,胺体转变为稳定的三级结构.
- 修改后的胺体9/10/16^OMe显示出显著改善的ATP结合亲和力 (Kd~0.7μM).
结论:
- 这项研究揭示了ATP的强大DNA吸收体的详细结构基础和适应性结合机制.
- 结构-功能洞察力使得能够开发出一种增强的DNA体,对ATP有更高的亲和力.
- 这些发现凸显了DNA体作为各种应用的复杂分子工具的潜力.
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