quantum yield. This probe is up to 50-fold brighter than 2-aminopurine, the fluorescent nucleoside standard. Moreover, the dual emission is highly sensitive to the polarity of the environment; thus, a strong shielding effect of the flanking bases from water was observed. With this nucleoside, the effect of a viral chaperone protein on DNA base stacking was site-selectively monitored.
                                    为了开发一种研究 DNA 相互作用的新工具,合成了一种包含 3-羟基
色酮 (3HC) 荧光团作为核碱基模拟物的核苷类似物,并将其掺入寡核苷酸链中。与现有的荧光核苷类似物相比,这种
染料具有在两个分辨率良好的荧光带之间切换的卓越环境敏感性。在标记的 DNA 中,这种核苷类似物不会改变双链体构象并表现出高荧光量子产率。该探针比荧光核苷标准品 
2-氨基嘌呤亮 50 倍。此外,双发射对环境的极性高度敏感;因此,观察到侧翼碱基对
水的强屏蔽作用。有了这个核苷,