Anomeric 5‐Aza‐7‐deaza‐2′‐deoxyguanosines in Silver‐Ion‐Mediated Homo and Hybrid Base Pairs: Impact of Mismatch Structure, Helical Environment, and Nucleobase Substituents on DNA Stability
作者:Xinglong Zhou、Dasharath Kondhare、Peter Leonard、Frank Seela
DOI:10.1002/chem.201901276
日期:2019.8.6
silver ion addition differ significantly. Homo base pairs with β‐d/β‐d or α‐d/α‐d nucleoside combinations are more stable than α‐d/β‐d hybrid base pairs. The positional switch of silver‐ion‐mediated base pairs has a significant impact on stability. Nucleobase substituents introduced at the 5‐position of the dC site of silver‐mediated base pairs affect base pair stability to a minor extent. Our investigation
银介导的5-氮杂-7-脱氮鸟嘌呤-胞嘧啶碱基对的核苷构型(α- d与β- d),核碱基取代基和螺旋DNA环境对DNA稳定性有很大影响。通过对银介导的α- d和β- d碱基对寡核苷酸双链体的研究已证明了这一点。包含在12-mer双链体中的异头5-氮杂-7-脱氮基-2'-脱氧鸟苷和异头2'-脱氧胞苷。为此,已经开发了一种新的合成方案,可通过对受保护的核碱基或其盐进行糖基化,然后通过结晶和色谱分离糖基化产物来获得5-氮杂-7-脱氮基-2'-脱氧鸟苷的纯异头物。 。在两个序列环境中,在具有α- d /α- d和β- d /β- d同源碱基对或α- d /β- d和β- d /α- d杂种对的双链体上进行热稳定性测量寡核苷酸双链体的图6或7。各自的T添加银离子后观察到的m稳定性增加显着不同。具有β- d /β- d或α- d /α- d核苷组合的同质碱基对比α- d /β- d杂合碱基对更稳定。银离