Remote cis-syn-thymine [2+2] dimers are not repaired by radical cations migrating in duplex DNA

Citation
Ak. Dotse et al., Remote cis-syn-thymine [2+2] dimers are not repaired by radical cations migrating in duplex DNA, J AM CHEM S, 122(29), 2000, pp. 6825-6833
Citations number
79
Categorie Soggetti
Chemistry & Analysis",Chemistry
Journal title
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
ISSN journal
00027863 → ACNP
Volume
122
Issue
29
Year of publication
2000
Pages
6825 - 6833
Database
ISI
SICI code
0002-7863(20000726)122:29<6825:RC[DAN>2.0.ZU;2-W
Abstract
A series of DNA oligomers was prepared containing an anthraquinone derivati ve linked to a 5'-end, a cis-syn-[2 + 2]thymine dimer and strategically loc ated GG steps. These compounds were designed to test the claim that one-ele ctron oxidation of the DNA leads to repair of remote thymine dimers. Irradi ation of the anthraquinone leads to remote damage at the 5'-G of GG steps t hat are positioned both before and after the thymine dimer, but there is no detectable (<3%) repair of the thymine dimer. These findings are in contra st to a previous series of reports in which repair of the thymine dimer is reported to occur 40 times more efficiently than reaction at GG steps when the remote one-electron oxidation is initiated by irradiation of a covalent ly linked Rh-containing metallointercalator.