Influence of Na<sup>+</sup> on DNA Reactions with Aromatic Epoxides and Diol Epoxides: Evidence That DNA Catalyzes the Formation of Benzo[<i>a</i>]pyrene and Benz[<i>a</i>]anthracene Adducts at Intercalation Sites
作者:Harshica Fernando、Chao-Ran Huang、Ann Milliman、Luchuan Shu、Pierre R. LeBreton
DOI:10.1021/tx960134j
日期:1996.1.1
BP metabolites. DNA adducts, which account for less than 10% of the yields, also form. For BPDE in 0.20 mM ctDNA, k decreases 5.1 times as the Na+ concentration increases from 2.0 to 100 mM. Nevertheless, the DNA adduct level remains constant over the range of Na+ concentrations examined. These results provide evidence that, for BPDE in 0.20 mM DNA and 2.0 mM Na+, ctDNA adduct formation follows a mechanism
苯并[a] py(BP)和苯并[a]蒽(BA)代谢产物,(+/-)-trans-7 8-二羟基-抗-9、10-环氧-7、8、9、10的反应-四氢-BP(BPDE),(+/-)-trans-3,4-二羟基-反-1,2-环氧-1,2,3,4-四氢-BA(BADE),(+/-)在伪一阶条件下,在变化的Na +(2.0-100 Mm)和天然浓度下,检查了-BP-4,5-氧化物(BPO)和(+/-)-BA-5、6-氧化物(BAO)小牛胸腺DNA(ctDNA)浓度。在0.2 mM的ctDNA和2.0 mM的Na +中,pH值为7.3时,大多数BPDE,BADE,BPO和BAO(87-95%)都会经历DNA催化的水解或重排。对于BPDE和BPO,2.0 mM Na +和0.2 mM ctDNA中的总体伪一级速率常数k比不使用DNA获得的值大21-72倍。对于BADE和BAO,速率常数受DNA的影响较小。k值为0。2