Oxaluric Acid as the Major Product of Singlet Oxygen-Mediated Oxidation of 8-Oxo-7,8-dihydroguanine in DNA
作者:Victor Duarte、Didier Gasparutto、Lydia F. Yamaguchi、Jean-Luc Ravanat、Glaucia R. Martinez、Marisa H. G. Medeiros、Paolo Di Mascio、Jean Cadet
DOI:10.1021/ja002218r
日期:2000.12.1
oxygen oxidation products of 8-oxoGua in single-stranded DNA. Oxaluric acid was found to be the predominant product of the reaction. Insights in the mechanistic pattern of oxaluric acid formation were gained from isotopic labeling experiments in association with mass spectrometry measurements. It was found that oxaluric acid is formed via an oxidized guanidinohydantoin intermediate, arising from the likely
DNA 的氧化反应通常会导致碱基修饰。在四种 DNA 碱基中,鸟嘌呤最易被氧化,其主要的氧化化合物之一,即 8-oxo-7,8-dihydroguanine (8-oxoGua) 在形成、修复和致突变性。然而,后者修饰的嘌呤碱很容易进行进一步的氧化反应,这在最近成为一个令人感兴趣的问题。这项工作的重点是鉴定单链 DNA 中 8-oxoGua 的最终单线态氧氧化产物。发现草酸是反应的主要产物。从与质谱测量相关的同位素标记实验中获得了对草酸形成机制模式的深入了解。发现草酸是通过氧化胍基乙内酰脲中间体形成的,由瞬态 5-氢过氧化物的可能降解产生。伴随着两个随后的水解步骤...