Photosensitized Splitting of Cis-syn 1, 3-Dimethylthymine Dimer by Tryptophan and Its Peptides

Acta Chimica Sinica ›› 2003, Vol. 61 ›› Issue (9): 1503-1507. Previous Articles Next Articles

Original Articles

色氨酸及其肽对cis-syn型1，3-二甲基胸腺嘧啶二聚体的光敏化裂解作用

晏利琴;宋钦华;黑晓明;郭庆祥;俞书勤

中国科学技术大学化学系;中国科学技术大学化学物理系

发布日期:2003-09-15

Photosensitized Splitting of Cis-syn 1, 3-Dimethylthymine Dimer by Tryptophan and Its Peptides

Yan Liqin;Songn Qinhua;Hei Xiaoming;Guo Qingxiang;Yu Shuqin

Department of Chemistry, University of Science and Technology of China;Department of Chemical Physics, University of Science and Technology of China

Published:2003-09-15

Abstract

Photosensitized splitting of cis-syn 1,3-dimethylthymine dimer by tryptophan and its peptides (Trp-Phe) was studied based on the fluorescence quenching experiments and irradiation experiments deteimining the splitting percentage of the dimer. It was revealed that 1,3-dimethylthymine dimer was mainly splitted by e_(aq)~- resulted from Lwo-photon ionization of Trp and its peptides under irradiation with light (λ > 290 ran) . Moreover, the excited singlet state of Trp and its peptides can transfer an electron to the dimer and make it splitted. In addition, the excited triplet state of Trp can also transfer an electron to the dimer and make it splitted.

Key words: TRYPTOPHAN, CYCLOBUTANE P, THYMINE, DIMER, TRIPLET, PYROLYSIS

CLC Number:

O621

Cite this article

Yan Liqin;Songn Qinhua;Hei Xiaoming;Guo Qingxiang;Yu Shuqin. Photosensitized Splitting of Cis-syn 1, 3-Dimethylthymine Dimer by Tryptophan and Its Peptides[J]. Acta Chimica Sinica, 2003, 61(9): 1503-1507.

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色氨酸及其肽对cis-syn型1，3-二甲基胸腺嘧啶二聚体的光敏化裂解作用

Photosensitized Splitting of Cis-syn 1, 3-Dimethylthymine Dimer by Tryptophan and Its Peptides

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