在DNA中的i-图案结构是否与细胞因子-Ag-I-细胞因子基对相容?
Victoria Seiffert1, Carmen López-Chamorro2, Miquel Barceló-Oliver3
1Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstr. 28/30, 48149, Münster, Germany.
Angewandte Chemie (International ed. in English)
|November 17, 2025
概括
银离子可以取代DNAi动图中的质子,但只有在可访问的C:CH+对中. 与之前的发现相反,DNA i-motif通常不兼容形成连续的C-AgI-C基对.
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:
- DNAi-motifs是四链DNA结构,在酸性pH下通过半质子化C:CH+基对稳定.
- 这些结构对纳米技术和治疗有兴趣.
- 在中性的pH值下,i-motifs的稳定性和潜在的修饰被积极研究.
研究的目的:
- 为了研究用银离子 (Ag+) 替换DNAi-动图结构的C:CH+基对中的质子的可行性.
- 在将银离子纳入i-motif/双重连接 (IDJ) 时,描述结构和稳定性的变化.
- 评估DNAi-motif结构与C-Ag+-C基对的形成的兼容性.
主要方法:
- 质子核磁共振 (1H NMR) 光谱学.
- 发光光谱学 光谱光谱学
- 温度依赖的紫外线光谱学
- 异热定位热量计 (ITC) 是一种热量计.
- 动态光散射 (DLS) 是一种
- 循环二重化 (CD) 光谱法 循环二重化 (CD) 光谱法
主要成果:
- 在研究的IDJ中,只有最容易获得的C:CH+基对才能转换为C-Ag+-C基对.
- 每个IDJ加入超过一个银离子,导致结构重组到更大的聚合结构中.
- 聚合结构可能涉及非正规的银介导基配对.
结论:
- DNA i-动机结构通常不兼容连续的C-Ag+-C基对的形成.
- 银离子的结合仅限于i-motif中的特定,可访问的网站.
- 这些发现与早期的报告形成鲜明对比,这些报告表明i-motifs与银离子的更广泛的兼容性.
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