chromophore. On the other hand, their B‐form duplexes, formed at a low NaCl concentration, produced a faint ICD signal. The specific ICD for the Z‐form duplexes was found to appear only when the chromophores were attached at the 5′ ends of each of the ODNs. Furthermore, the chromophoric alkynylnucleoside residues effectively promoted the B to Z transition of the ODN.
我们开发了一种带有生色团连接的炔基脱氧
核糖骨架的诱导圆二色性(ICD)探针,用于分析可见光区域中DNA双链体的高级结构。当在其5'末端带有探针的CG重复寡核苷酸(ODN)在高NaCl浓度下采用Z型双链体时,在发色团的吸收区域观察到强ICD信号。另一方面,在低NaCl浓度下形成的B型双链体产生了微弱的ICD信号。发现仅当发色团附着在每个ODN的5'末端时,才会出现Z型双链体的特定ICD。此外,发色的炔基核苷残基有效地促进了ODN的B到Z过渡。