在G-四重复结构中发生的破坏,具有二阳性CuIICuII412-金属冠-4的结构
Agata Głuszyńska1, Curtis M Zaleski2, Elizabeth Manickas2
1Department of Analytical Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego St. 8, 61-614, Poznań, Poland.
International journal of biological macromolecules
|December 19, 2025
概括
一种新型的铜金属冠 (MC) 有效地破坏G-四重复 (G4) DNA结构,包括来自人类端粒和瘤基因的结构. 这种金属冠显示出显著的结合亲和性,并破坏了G4DNA的稳定性,提供了潜在的治疗应用.
科学领域:
- 协调化学 协调化学
- 生物物理化学 生物物理化学
- 分子生物学分子生物学
背景情况:
- G-四重复 (G4) DNA 结构与关键的生物过程有关,包括端粒维护和瘤基因调节.
- 准G4DNA为治疗癌症等疾病的治疗干预提供了一个有希望的策略.
- 金属冠 (MCs) 是具有DNA相互作用潜力的宏环协调化合物.
研究的目的:
- 为了合成和表征一个Dianionic CuII4 12-metallacrown-4 (MC).
- 调查这种MC对各种G-四重复基因组 (G4DNA) 结构的破坏性影响.
- 为了确定MC-G4 DNA相互作用的结合亲和力和热力学参数.
主要方法:
- 使用UV-Vis光谱,光谱和循环二元化 (CD) 光谱来研究MC-G4 DNA相互作用.
- 光G4-FID测定被用于量化结合亲缘关系 (KMC).
- 进行了DNA化分析,以评估相互作用的热力学有利性.
主要成果:
- CuII4 12-MC-4显示了五个不同的G4DNA结构的显著破坏,包括端粒和瘤序列 (22HT/Na,22HT/K,c-MYC,c-KIT1,Bcl-2).
- CD定位实验显示超过60%的信号扭曲,对c-MYC和c-KIT1.1的平行G4结构有>90%的扭曲.
- 结合亲和度各不相同,对端粒序列 (22HT/Na: 3.1 × 10^5 M−1,22HT/K: 6.2 × 10^5 M−1) 观察到的亲和度最高.
- 基因融分析显示了对G4c-MYC产生最大的不稳定作用 (ΔG变化从-7.4到-2.2 kcal mol-1).
结论:
- 双离子CuII4 12-MC-4是一种有效的G4DNA结构破坏剂.
- 该MC与G4DNA具有显著的结合亲和性和热力学上有利的相互作用.
- 这些发现突显了这种金属冠的潜力,作为G4DNA向剂,用于治疗开发.
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