Pyrimido[1,2-<i>α</i>]purin-10(3<i>H</i>)-one: A Reactive Electrophile in the Genome
作者:Nathalie Schnetz-Boutaud、J. Scott Daniels、Muhammed F. Hashim、Peter Scholl、Tamika Burrus、Lawrence J. Marnett
DOI:10.1021/tx000135i
日期:2000.10.1
Previous studies have shown that tris(hydroxymethyl)aminomethane adds to 1 at elevated pH, forming an enaminoimine (2), but it is uncertain whether 1 reacts directly or hydrolyzes under basic conditions to N(2)-(3-oxo-1-propenyl)deoxyguanosine (3) prior to amine addition. We report that 1 reacts at neutral pH with hydroxylamines to form oximes. The rate of reaction of 1 with hydroxylamines at pH 7 is
丙二醛和基础丙二醛与DNA中的脱氧鸟嘌呤残基反应形成环外加合物,嘧啶并[1,2-α嘌呤-10(3H)-一(1),已在健康人的基因组DNA中以高水平检测到。先前的研究表明,三(羟甲基)氨基甲烷在pH升高时会添加到1中,形成一个烯氨基亚胺(2),但尚不确定1是否在碱性条件下直接反应或水解成N(2)-(3-oxo-1-胺加成前先用丙烯基)脱氧鸟苷(3)。我们报告1在中性pH下与羟胺反应形成肟。1与羟胺在pH 7下的反应速率比1至3的水解速率至少快150倍。因此,1与亲核试剂直接反应。