Deoxyribonucleic acid modification by mutagenic 3-amino-1-methyl-5H-pyrido(4,3-b)indole: The chemical events.
作者:YUICHI HASHIMOTO、KOICHI SHUDO、TOSHIHIKO OKAMOTO
DOI:10.1248/cpb.32.4300
日期:——
3-Amino-1-methyl-5H-pyrido [4, 3-b] indole (Trp-P-2) is a mutagen/carcinogen isolated from a pyrolysate of L-tryptophan. The active metabolite of Trp-P-2, 3-hydroxyamino-1-methyl-5H-pyrido [4, 3-b] indole (N-OH-Trp-P-2), was synthesized and the chemical reactions of N-OH-Trp-P-2 with deoxyribonucleic acid were investigated. The structure of the nucleic acid base covalently bound with Trp-P-2 was elucidated as 3-(C8-guanyl) amino-1-methyl-5H-pyrido [4, 3-b] indole (Gua-Trp-P-2) by comparison with a synthetic sample. The initial chemical events in carcinogenesis caused by Trp-P-2 were established.
3-氨基-1-甲基-5H-吡啶并[4,3-b]吲哚(Trp-P-2)是从 L-色氨酸的热解产物中分离出来的一种诱变剂/致癌物质。研究人员合成了 Trp-P-2 的活性代谢物--3-羟基氨基-1-甲基-5H-吡啶并[4,3-b]吲哚(N-OH-Trp-P-2),并研究了 N-OH-Trp-P-2 与脱氧核糖核酸的化学反应。通过与合成样品的对比,阐明了与 Trp-P-2 共价结合的核酸碱基的结构为 3-(C8-鸟嘌呤基)氨基-1-甲基-5H-吡啶并[4, 3-b] 吲哚(Gua-Trp-P-2)。确定了 Trp-P-2 致癌的最初化学事件。