Formation of adducts in the reaction of glyoxal with 2′-deoxyguanosine and with calf thymus DNA
作者:Donata Pluskota-Karwatka、Agnieszka J. Pawłowicz、Magdalena Tomas、Leif Kronberg
DOI:10.1016/j.bioorg.2007.10.004
日期:2008.4
transformed to Gx(1)-dG, which is a stable adduct and seems to be the end-product of the glyoxal reaction with 2'-deoxyguanosine. All adducts formed in the reaction of glyoxal with 2'-deoxyguanosine were observed in calf thymus DNA. Also in DNA, Gx(1)-dG was the only stable adduct. The transformation of Gx-dG to Gx(1)-dG seemed to take place in single-stranded DNA and therefore, Gx(1)-dG may be a potentially
在生理条件下,乙二醛与2'-脱氧鸟苷和小牛胸腺单链和双链DNA在缓冲水溶液中的反应在生理条件下会导致形成两个先前未发现的加合物,除了已知的反应产物3-(2'-脱氧- β-D-赤型-五呋喃糖基)-5,6,7-三氢-6,7-二羟基咪唑并[1,2-a]嘌呤-9-一(Gx-dG)。通过反相液相色谱法分离和纯化加合物,并通过紫外吸收,质谱,(1)H和(13)C NMR谱对结构进行表征。迄今未知的加合物被鉴定为:5-羧甲基-3-(2'-脱氧-β-D-赤-五呋喃糖基)-5,6,7-三氢-6,7-二氢吡喃咪唑[1,2-a]嘌呤-9-一(Gx(2)-dG)和N(2)-(羧甲基)-9-(2'-脱氧β-D-赤型五呋喃糖基)-嘌呤-6(9H)-一(Gx (1)-dG)。两种加合物均显示为源自Gx-dG。发现Gx-dG和Gx(2)-dG不稳定并部分转化为Gx(1)-dG,Gx(1)-dG是稳定的加合物,似乎是与2'