Optimization of non-natural nucleotides for selective incorporation opposite damaged DNA
作者:Diana Vineyard、Xuemei Zhang、Alison Donnelly、Irene Lee、Anthony J. Berdis
DOI:10.1039/b712480e
日期:——
achieved through optimization of shape and pi-electron density. In this report, we describe the synthesis and kinetic characterization of four novel nucleotide analogs, 5-cyanoindolyl-2'-deoxyriboside 5'-triphosphate (5-CyITP), 5-ethyleneindolyl-2'-deoxyriboside 5'-triphosphate (5-EyITP), 5-methylindolyl-2'-deoxyriboside 5'-triphosphate (5-MeITP), and 5-ethylindolyl-2'-deoxyriboside 5'-triphosphate (5-EtITP)
称为转移DNA合成的促突变过程反映了DNA聚合酶错误插入与受损DNA模板相对的核苷酸的能力。为了研究在此过程中核苷酸选择的潜在机制,我们量化了与无碱基位点,非模板DNA损伤相对的各种非天然核苷酸类似物的掺入。我们使用噬菌体T4 DNA聚合酶进行的动力学研究表明,传入核苷酸的pi电子表面积在很大程度上促进了无碱基位点掺入的效率。剩下的问题是这些非氢键类似物的选择性插入是否可以通过优化形状和π电子密度来实现。在这份报告中,我们描述了四种新型核苷酸类似物的合成和动力学表征,5-氰基吲哚基-2'-脱氧核糖5'-三磷酸(5-CyITP),5-乙烯吲哚基-2'-脱氧核糖5'-三磷酸(5-EyITP),5-甲基吲哚基-2'-脱氧核糖5'-三磷酸(5 -MeITP)和5-乙基吲哚基2'-脱氧核糖苷5'-三磷酸酯(5-EtITP)。动力学分析表明,所有四个核苷酸的总体催化效率与其碱基堆积特性有关。实际上,与