DEB-FAPy-dG Adducts of 1,3-Butadiene: Synthesis, Structural Characterization, and Formation in 1,2,3,4-Diepoxybutane Treated DNA.

DEB-FAPy-dG Adducts of 1,3-Butadiene: Synthesis, Structural Characterization, and Formation in 1,2,3,4-Diepoxybutane Treated DNA.
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DOI:
10.1002/chem.202103245
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发表时间:
2022-01-13
影响因子:
4.3
通讯作者:
Tretyakova, Natalia
Tretyakova, Natalia
中科院分区:
化学2区
文献类型:
--
作者:
Pujari, Suresh S.;Krueger, Caitlin C. Jokipii;Chao, Christopher;Hutchins, Spencer;Hurben, Alexander K.;Boysen, Gunnar;Tretyakova, Natalia

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细胞色素450单加氧酶对人类致癌物1,3-丁二烯(BD)的代谢活化产生遗传毒性二环氧化物1,2,3,4-二环氧丁烷(DEB)。该反应性亲电试剂使DNA中的鸟嘌呤碱基烷基化以产生N7-(2-羟基-3,4-环氧-1-基)-dG(N7-HEB-dG)加合物。由于嘌呤杂环的N7位带正电荷,N7-HEB-dG加合物本身不稳定,可发生自发脱嘌呤或碱催化的咪唑开环,得到N6-[2-脱氧-D-赤型-戊呋喃糖基]-2,6-二氨基-3,4-二氢-4-氧代-5-N-1-(环氧乙烷-2-基)丙-1-醇-甲酰胺基嘧啶(DEB-FAPy-dG)加合物。本文报道了DEB-FAPy-dG加合物的首次合成和结构表征。DEB-FAPy-dG及其15 N3标记的类似物的真实标准品用于开发定量nanoLC-ESI+-HRMS/MS方法,允许在DEB处理的小牛胸腺DNA中检测加合物。DNA中DEB-FAPy-dG的形成依赖于DEB浓度和pH,在碱性条件下观察到更高的数量。甲酰胺基嘧啶(FAPy)是高度致突变的DNA损伤。在这里,我们描述了第一个合成和完整的结构表征的二环氧丁烷(DEB)衍生的甲酰氨基嘧啶的dG(DEB-FAPy-dG)。建立了同位素稀释nanoLC-ESI+-HRMS/MS方法,并在DEB处理的DNA中检测到DEB-FAPy-dG加合物。
Metabolic activation of the human carcinogen 1,3-butadiene (BD) by cytochrome 450 monooxygenases gives rise to a genotoxic diepoxide, 1,2,3,4-diepoxybutane (DEB). This reactive electrophile alkylates guanine bases in DNA to produce N7-(2-hydroxy-3,4-epoxy-1-yl)-dG (N7-HEB-dG) adducts. Because of the positive charge at the N7 position of the purine heterocycle, N7-HEB-dG adducts are inherently unstable and can undergo spontaneous depurination or base-catalyzed imidazole ring opening to give N6-[2-deoxy-D-erythro-pentofuranosyl]-2,6-diamino-3,4-dihydro-4-oxo-5-N-1-(oxiran-2-yl)propan-1-ol-formamidopyrimidine (DEB-FAPy-dG) adducts. Here we report the first synthesis and structural characterization of DEB-FAPy-dG adducts. Authentic standards of DEB-FAPy-dG and its 15N3-labeled analogue were used for the development of a quantitative nanoLC-ESI+-HRMS/MS method, allowing for adduct detection in DEB-treated calf thymus DNA. DEB-FAPy-dG formation in DNA was dependent on DEB concentration and pH, with higher numbers observed under alkaline conditions. Formamidopyrimidnes (FAPy) are highly mutagenic DNA lesions. Here we describe the first synthesis and complete structural characterization of a diepoxybutane (DEB) derived formamidopyrimidine of dG (DEB-FAPy-dG). An isotope dilution nanoLC-ESI+-HRMS/MS method was developed and DEB-FAPy-dG adducts were detected in DEB treated DNA.
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