Benzothiazole-based cyanines as fluorescent “light-up” probes for duplex and quadruplex DNA
作者:Anton V. Turaev、Vladimir B. Tsvetkov、Maria V. Tankevich、Igor P. Smirnov、Andrey V. Aralov、Galina E. Pozmogova、Anna M. Varizhuk
DOI:10.1016/j.biochi.2019.04.018
日期:2019.7
in complexes with various DNA structures, including G-quadruplexes (G4s) and i-motifs (IMs), were analyzed. All dyes efficiently distinguished G4s and ss-DNA. The bi- and tri-substituted derivatives had basically similar distributions of relative fluorescence intensities. The mono-substituted derivatives exhibited enhanced sensitivity to parallel G4s. All dyes were particularly sensitive to a G4 structure
从相应的吡啶鎓盐,盐或啶鎓盐获得在1-甲基吡啶鎓环中具有一个,两个或三个甲基苯并噻唑基亚甲基亚甲基取代基的苯并噻唑橙(BO)的类似物。分析了具有各种DNA结构的复合物(包括G-四链体(G4s)和i-基序(IMs))中已知和新型染料的荧光参数。所有染料均能有效区分G4s和ss-DNA。双取代和三取代的衍生物具有基本相似的相对荧光强度分布。单取代的衍生物表现出对平行G4的增强的敏感性。所有染料对带有附加双链模块(凝血酶结合适体TBA31)的G4结构特别敏感,这可能是由于独特的结合模式(与两个模块之间的结合处相互作用)所致。特别是,与游离染料相比,BO与TBA31配合使用时,荧光量子产率显着提高(160倍)。与来自癌基因启动子的充分表征的G4配合的2,4-双取代衍生物的荧光量子产率在0.04-0.28的范围内,即与ThT相当。单/双取代衍生物应被视为可能形成G4的发光探针。