端粒突起的可访问性,以稳定小分子带
Janan Alfehaid1,2, Vidsara Surasinghe1, Sineth G Kodikara1
1Department of Physics, Kent State University, Kent, OH 44242, USA.
bioRxiv : the preprint server for biology
|December 22, 2025
概括
端粒突起形成G-四重复合体 (GQs),可以被抗癌药物准. 这项研究揭示了悬浮结构如何限制药物结合,为开发更有效的GQ向治疗方法提供了见解.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 遗传学 遗传学 是一个
背景情况:
- 人类染色体具有与重复序列形成G-四重复合体 (GQs) 的端粒悬浮.
- 稳定GQs的小分子可以抑制端粒酶,这是抗癌药物的标.
- 对于药物开发来说,了解端粒突起中的联体对GQs的可访问性至关重要.
研究的目的:
- 调查端粒突起的结构如何影响小分子连接体与G-四重复合体 (GQs) 的结合.
- 量化一个端美沙丁衍生物对不同长度和结构的端粒突起的结合史泰基几何学.
- 为设计改进的GQ向性抗癌剂提供机制性见解.
主要方法:
- 单分子光显微镜和阶段性光漂白分析以确定连接物结合的固基度.
- 合成和使用一个光标记的牛醇端美他衍生物 (L1Cy5-7OTD).
- 组合光增强实验与N-甲基介质氨酸IX (NMM) 和使用1D格子模型的计算建模.
主要成果:
- 较长的端粒突起容纳了更多的连接体,但表现出低于理论的结合固态度,和6个连接体.
- 观察到较长的G-四倍体 (GQ) 间隔器 (9-nt与3-nt) 时,结合连接体的增加.
- 建模揭示了GQ折叠之间的积极合作,对立的GQ面上的连接体之间的消极合作,以及在双链/单链连接处的结合减少.
结论:
- 端粒突起架构显著决定了小分子对G-四重复合体的可访问性.
- 带结合受 GQ 折叠合作性和悬架内的空间布局的影响.
- 这些发现提供了机制性的理解,以指导针对GQ的抗癌药物的合理设计.
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