Synthesis of 3,N4-Etheno, 3,N4-Ethano, and 3-(2-Hydroxyethyl) Derivatives of 2'-Deoxycytidine and Their Incorporation into Oligomeric DNA
作者:Weifeng Zhang、Robert Rieger、Charles Iden、Francis Johnson
DOI:10.1021/tx00043a020
日期:1995.1
of 2'-deoxycytidine arise in mammalian DNA that has been exposed to the metabolic products of either vinyl chloride or the antitumor drug bis(chloroethyl)nitrosourea. These chemically-related adducts are thought to be associated with both mutagenesis and carcinogenesis. In this paper we report reliable syntheses of these deoxynucleosides and incorporation of the latter into oligodeoxynucleotides by the
2'-脱氧胞苷的3,N4-乙醇,3,N4-乙醇和3-(2-羟乙基)衍生物出现在哺乳动物DNA中,该DNA暴露于氯乙烯或抗肿瘤药物双(氯乙基)的代谢产物中亚硝基脲。这些化学相关的加合物被认为与诱变和致癌作用有关。在本文中,我们报告了这些脱氧核苷的可靠合成方法,并使用自动化方法通过亚磷酰胺途径将后者并入寡聚脱氧核苷酸中。发现3-(2-羟乙基)-2′-脱氧胞苷在水溶液中不稳定并且经历自动诱导的水解成3-(2-羟乙基)-2′-脱氧尿苷。发现该水解速率是pH依赖性的,其最大pH约为8,半衰期约为5小时。在较高或较低的酸度下,反应速率下降,表明该过程涉及一般的酸碱催化。因此,在这种情况下,获得具有3-(2-羟乙基)-2′-脱氧尿苷残基而不是胞苷类似物的低聚物。前者很可能代表生理条件下DNA中寿命更长的物种。含有这些化学损伤的代表性低聚物通过质谱和酶促降解方法进行了分析,以确认其结构。