Reactions of the OOH radical with guanine: Mechanisms of formation of 8-oxoguanine and other products

被引：17

作者：

Kumar, Nagendra ^{[1
]}

Shukla, P. K. ^{[2
]}

Mishra, P. C. ^{[1
]}

机构：

[1] Banaras Hindu Univ, Dept Phys, Varanasi 221005, Uttar Pradesh, India

[2] Assam Univ, Dept Phys, Silchar 788011, India

来源：

CHEMICAL PHYSICS | 2010年 / 375卷 / 01期

关键词：

Reactive oxygen species (ROS); Peroxyl radicals; OOH radical; Guanine; 8-Oxoguanine; Mutation; DENSITY-FUNCTIONAL THERMOCHEMISTRY; LIPID-PEROXIDATION; DNA-DAMAGE; SUPEROXIDE RADICALS; AQUEOUS-SOLUTION; EXACT-EXCHANGE; OXIDATION; PEROXYNITRITE; IMIDAZOLE; ACID;

D O I：

10.1016/j.chemphys.2010.08.004

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The mutagenic product 8-oxoguanine (8-oxoGua) is formed due to intermediacy of peroxyl (OOR) radicals in lipid peroxidation and protein oxidation-induced DNA damage. The mechanisms of these reactions are not yet understood properly. Therefore, in the present study, the mechanisms of formation of 8-oxoGua and other related products due to the reaction of the guanine base of DNA with the hydroperoxyl radical (OOH) were investigated theoretically employing the B3LYP and BHandHLYP hybrid functionals of density functional theory and the polarizable continuum model for solvation. It is found that the reaction of the OOH radical with guanine can occur following seven different mechanisms leading to the formation of various products including 8-oxoGua, its radicals, 5-hydroxy-8-oxoguanine and CO(2). The mechanism that yields 8-oxoGua as an intermediate and 5-hydroxy-8-oxoGua as the final product was found to be energetically most favorable. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：118 / 129

页数：12

共 28 条

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