Deoxynucleoside Triphosphate Containing Pyridazin-3-one Aglycon as a Thymidine Triphosphate Substitute for Primer Extension and Chain Elongation by Klenow Fragments
作者:Takahito Tomori、Kento Nagaoka、Leo Takeshita、Takashi Shiozawa、Yuya Miyatake、Yoshiaki Masaki、Mitsuo Sekine、Kohji Seio
DOI:10.1021/acs.joc.8b00918
日期:2018.8.3
analogue lacking a 2-keto group—as the nucleobase. Theoretical analyses and hybridization experiments indicated that PzO recognizes adenine (A) for formation of a Watson–Crick base pair. Primer extension reactions using nucleoside 5′-triphosphate and the Klenow fragment revealed that the synthetic nucleoside 5′-triphosphate was incorporated into the 3′ end of the primer through recognition of A in the
脱氧核苷5'-三磷酸酯是用3-oxo-2 H-哒嗪-6-基(Pz O)(一种缺少2-酮基的尿嘧啶类似物)作为核碱基合成的。理论分析和杂交实验表明,Pz O识别腺嘌呤(A)以形成Watson-Crick碱基对。使用核苷5'-三磷酸和Klenow片段的引物延伸反应表明,通过识别模板链中的A,合成核苷5'-三磷酸被掺入了引物的3'端。此外,以Pz O为碱基的3'-核苷酸残基对Klenow片段exo +的3'-核酸外切酶活性有抗性。带有Pz O的底漆3'端的碱基可以在随后的链延长中起作用。Pz O的这些特性归因于在糖苷键邻位的环内氮原子的存在,推测该环内氮原子与DNA聚合酶的氨基酸残基形成H键,可有效识别Pz O的3'端。用于引物延伸的引物。这些结果为通过结合糖苷键邻位的氮原子和沃森-克里克氢键的碱基配对位点提供了设计新核碱基的基础。