Synthesis of 8-halogenated-7-deaza-2′-deoxyguanosine as an 8-oxo-2′-deoxyguanosine analogue and evaluation of its base pairing properties
作者:Yizhen Yin、Yosuke Taniguchi、Shigeki Sasaki
DOI:10.1016/j.tet.2014.01.047
日期:2014.3
8-Halogenated-7-deaza-2′-deoxyguanosines (8-halo-7-deaza-dG) were designed to structurally mimic 8-oxo-2′-deoxyguanosine (8-oxo-dG), which is representative of an oxidized nucleoside. It has been shown by NMR that the conformation around the N-glycosidic bond of (8-halo-7-deaza-dG) is preferably syn, similar to 8-oxo-dG. The base pairing properties of 8-halo-7-deaza-dG were studied by measuring the
8-卤代7-脱氮基2'-脱氧鸟苷(8-卤代7-脱氮基-dG)被设计为在结构上模拟8-氧代2'-脱氧鸟苷(8-氧代-dG),这是一种氧化的代表。核苷。NMR表明,(8-卤代-7-脱氮-dG)的N-糖苷键周围的构象优选是syn,类似于8-氧代-dG。通过测量双链体的热变性温度,研究了8-halo-7-deaza-dG的碱基配对特性,表明它们与dC的碱基对与天然dG相比不稳定。这些结果也支持他们对syn的偏爱。构象。与8-oxo-dG不同,8-halo-7-deaza-dG不能与dA形成稳定的碱基对,最可能的原因是缺乏与dA的N7-H氢键。总之,新设计的8-halo-7-deaza-dG类似物的形状和对顺式构象的偏爱类似于8-oxo-dG ,但它们不会与相反的dA形成Hoogsteen碱基对。