Photochemical Hydrogen Abstraction and Electron Transfer Reactions of Tetrachlorobenzoquinone with Pyrimidine Nucleobases
Photochemical Hydrogen Abstraction and Electron Transfer Reactions of Tetrachlorobenzoquinone with Pyrimidine Nucleobases
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四氯苯醌与嘧啶核碱基的光化学夺氢和电子转移反应
DOI:
10.1088/1674-0068/24/05/580-585
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发表时间:
2011-10
影响因子:
1
通讯作者:
Wu Lidan
中科院分区:
文献类型:
--
作者:
Liu Kunhui;Du Qian;Yang Wen;*Su Hongmei;Zou Xiaoran;Wu Lidan
Pentachlorophenol, a widespread environmental pollutant that is possibly carcinogenic to humans, is metabolically oxidized to tetrachloroquinone (TCBQ) which can result in DNA damage. We have investigated the photochemical reaction dynamics of TCBQ with two pyrimidine type nucleobases (thymine and uracil) upon UVA (355 nm) excitation using the technique of nanosecond time-resolved laser flash photolysis. It has been found that 355 nm excitation populates TCBQ molecules to their triplet state 3TCBQ*, which are highly reactive towards thymine or uracil and undergo two parallel reactions, the hydrogen abstraction and electron transfer, leading to the observed photoproducts of TCBQH· and TCBQ·− in transient absorption spectra. The concomitantly produced nucleobase radicals and radical cations are expected to induce a series of oxidative or strand cleavage damage to DNA afterwards. By characterizing the photochemical hydrogen abstraction and electron transfer reactions, our results provide potentially important molecular reaction mechanisms for understanding the carcinogenic effects of pentachlorophenol and its metabolites TCBQ.
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影响因子:
3.3
作者:
J. Geimer;K. Hildenbrand;S. Naumov;D. Beckert
通讯作者:
J. Geimer;K. Hildenbrand;S. Naumov;D. Beckert
DOI:
10.1021/jp711846n
发表时间:
2008-05
期刊:
The journal of physical chemistry. A
影响因子:
--
作者:
A. Bose;D. Dey;S. Basu
通讯作者:
A. Bose;D. Dey;S. Basu
影响因子:
4.7
作者:
Lin, PH;Nakamura, J;Swenberg, JA
通讯作者:
Swenberg, JA
影响因子:
1.8
作者:
Kanvah, Sriram;Schuster, Gary B.
通讯作者:
Schuster, Gary B.
影响因子:
4.3
作者:
Jia, Suping;Zhu, Ben-Zhan;Guo, Liang-Hong
通讯作者:
Guo, Liang-Hong