作者:Mingyao Wang、Edward J. McIntee、Guang Cheng、Yongli Shi、Peter W. Villalta、Stephen S. Hecht
DOI:10.1021/tx000234w
日期:2001.4.1
LC-APCI-MS, and MS/MS. Four isomers of N(2)-(3-hydroxybutylidene)dG were observed. The (R)- and (S)-isomers were identified by reactions of chiral paraldol with dG; each existed as a pair of interconverting (E)- and (Z)-isomers. These data indicate that the structure of the major Schiff base DNA adduct in crotonaldehyde-treated DNA is N(2)-(3-hydroxybutylidene)dG (7). This adduct is unstable at the nucleoside
先前的研究表明,巴豆醛与DNA的反应会产生迈克尔加成产物,并且已在人体组织以及未经处理的实验动物组织中检测到了这些产物。第二类巴豆醛-DNA加合物在水解时释放出2-(2-羟丙基)-4-羟基-6-甲基-1,3-二恶烷(paraldol,12),这些加合物在数量上比迈克尔加成更重要体外。在这项研究中,我们证明巴豆醛释放帕拉尔多的DNA加合物的主要来源是席夫碱。巴豆醛与DNA的反应,然后用NaBH(3)CN处理和酶水解,导致形成N(2)-(3-羟丁基)dG(10),通过其UV,MS和质子NMR鉴定。巴豆醛或对苯二酚与dG的反应表明,席夫碱对N(2)-(3-羟基丁基)dG的前体是N(2)-(3-羟基丁烯)dG(7),通过UV,LC-APCI-MS鉴定,以及MS / MS。观察到N(2)-(3-羟基丁烯)dG的四个异构体。(R)-和(S)-异构体通过手性对羟基苯酚与dG的反应鉴定。每个都以一对互变的