Specificity of DNA Alkylation by 1-(2-Chloroethyl)-3-alkyl-3-acyltriazenes Depends on the Structure of the Acyl Group: Kinetic and Product Studies
作者:Marilyn B. Kroeger Smith、Brigitte F. Schmidt、Grzegorz Czerwinski、Lisa A. Taneyhill、Emily J. Snyder、Adam M. Kline、Christopher J. Michejda、Richard H. Smith
DOI:10.1021/tx950155y
日期:1996.1.1
principal reaction product. In the absence of esterase, the order of DNA alkylation for all of the acyltriazenes did not correlate with their respective rates of decomposition, leading to the conclusion that the triazenes did not decompose by the expected mode of uncatalyzed N(2)-N(3) heterolyic cleavage. The major DNA alkylation product from the N(3)-methyltriazenes was 7-methylguanine, instead of the expected
单独研究了小牛胸腺DNA与十个具有不同酰基侧链结构的1-(2-氯乙基)-3-烷基-3-酰基苯甲酰氮的反应,或在pH 7.0磷酸盐缓冲液中在猪肝酯酶存在下的反应。在几种关键的三氮烯中,酰基取代基包含一个游离的羧酸基团。在反应混合物中存在酯酶的情况下,所得的DNA烷基化水平可能与三氮烯分解的动力学速率相关。在这些条件下,主要的分解途径涉及母体三氮烯的脱酰作用并最终产生链烷重氮离子。该中间体随后将DNA-鸟嘌呤烷基化,得到7-烷基鸟嘌呤作为主要反应产物。在没有酯酶的情况下,DNA烷基化的顺序对所有的acyltriazenes都不与它们各自的分解速率相关,从而得出结论,三氮烯不会被未催化的N(2)-N(3)杂多裂解的预期模式分解。N(3)-甲基三氮烯的主要DNA烷基化产物是7-甲基鸟嘌呤,而不是预期的7-(氯乙基)-和7-(羟乙基)鸟嘌呤,这表明酰基正在被水解。但是,与预测相反,在该位置具有N(3