<i>N</i><sup>2</sup>,7-Bis(1-hydroxy-2-oxopropyl)-2‘-deoxyguanosine: Identical Noncyclic Adducts with 1,3-Dichloropropene Epoxides and Methylglyoxal
作者:Manfred Schneider、Gary B. Quistad、John E. Casida
DOI:10.1021/tx9801256
日期:1998.12.1
N2, 7-bis(1-hydroxy-2-oxopropyl)-dGuo. The assignments are based on HPLC/UV and HPLC/ES/MS experiments and 1H NMR spectral analysis of the first of the four adducts eluted with HPLC. Acid-catalyzed depurination converts the four dGuo derivatives to the two corresponding isomers of N2,7-bis(1-hydroxy-2-oxopropyl)guanine, assigned by ES/MS and 1H and 13C NMR. Although identical adducts are formed from
有人提出,顺式和反式1,3-二氯丙烯环氧化物(1,3-D-环氧化物)是主要的土壤熏蒸杀线虫剂1,3-二氯丙烯的倒数第二个或最终的遗传毒性代谢产物。1,3-D-环氧异构体和潜在的醛降解容易与2'-脱氧鸟苷(dGuo)形成加合物,但与2'-脱氧腺苷或2'-脱氧胞苷不形成加合物。dGuo与磷酸盐缓冲液中的1,3-D-环氧化合物(1:20摩尔当量)在pH 7.4下于37℃反应24小时,可完全转化为四种加合物,可通过HPLC分离,并具有相同的UV光谱以及电喷雾(ES)/ MS分子离子和碎片图谱。这些加合物不含氯,与用甲基乙二醛代替1,3-D-环氧化物更快获得的那些相同。其他人最初提出的具有dGuo的四个异构甲基乙二醛加合物为环状加合物1,N2-(1,2-二羟基-2-甲基)乙基-dGuo,但在此它们被重新指定为非环状双加合物的四个非对映异构体。 N2,7-双(1-羟基-2-氧代丙基)-dGuo。分配基于HPLC