在非CpG甲基化中以水为媒介的cis Watson-Crick/Hoogsteen基对形成的结构基础
Shan-Meng Lin1, Hsiang-Ti Huang1, Pei-Ju Fang2
1Graduate Institute of Genomics and Bioinformatics, National Chung Hsing University, Taichung 402, Taiwan.
Nucleic acids research
|July 11, 2024
概括
非CpG甲基化改变了DNA结构,形成了独特的水介导的cis Watson-Crick/Hoogsteen几何形状. 这一发现为DNA构造和表观遗传调节提供了关键的见解.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 非CpG甲基化与神经元发育和癌症有关.
- 非CpG甲基化对DNA的结构影响尚不清楚.
研究的目的:
- 阐明DNA中非CpG甲基化的结构后果.
- 为了研究非CpG位点的甲基化细胞因子诱导的构造变化.
主要方法:
- 具有CCG图案的DNA复合体的X射线晶体学.
- 核磁共振 (NMR) 光谱学.核磁共振 (NMR) 光谱学.
- 在药物echinomycin的存在下对DNA复合体的分析.
主要成果:
- 非CpG甲基化诱导了两个替代基对构造:沃森-克里克 (WC) 和一个独特的水介导的 Watson-Crick/Hoogsteen ((w) cWH).
- (w) cWH几何学涉及一个syn-guanosine形态,通过NMR观察到晶体结构和溶液.
- 药物埃奇诺米增加了甲基化DNA中 (w) cWH几何体的占用率.
- 在非CpG位点的细胞因子甲基化驱动了瓜诺辛的反-至-syn过渡,有利于 (w) cWH构造.
结论:
- 在非CpG二核酸中氨酸甲基化会诱导特定的DNA构造变化,有利于 (w) cWH几何.
- 这些结构变化是B型DNA中非CpG甲基化位点的特征.
- 这项研究揭示了在表观遗传调节期间对DNA构造动态的新见解.
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