PMID: 7011371Feb 17, 1981Paper

Identification of the cis-thymine glycol moiety in oxidized deoxyribonucleic acid

Biochemistry
K FrenkelG W Teebor

Abstract

5,6-Dihydroxy-5,6-dihydrothymine (thymine glycol) is formed in DNA by reaction with oxidizing agents and as a result of ionizing and near-ultraviolet radiation. We describe a rapid purification of cis-5,6-dihydroxy-5,6-dihydrothymine and cis-5,6-dihydroxy-5,6-dihydrothymidine (cis-thymidine glycol) and their use as markers in identifying the thymine glycol moiety in oxidized DNA. Both glycols were prepared by oxidation of [14C]thymine and -thymidine with KMnO4 followed by purification on Sephadex LH-20 (LH-20). [3H]DNA was oxidized with KMnO4 and the thymidine glycol in DNA identified by enzymatic digestion of the DNA followed by cochromatography of the digest with marker [14C]thymidine glycol on LH-20. The cis conformation of the glycol was confirmed by the change in the elution pattern when borate rather than water was used as eluent. Alkaline hydrolysis of a mixture of [14C]thymine glycol and oxidized [3H]DNA followed by trichloroacetic acid precipitation and LH-20 chromatographic analysis of the neutralized supernatant yielded a complex pattern of radioactive degradation products with coincidence of one 14C marker- and one [3H]-DNA-derived peak. All applied radioactivity was recovered. This methodology should be useful in d...Continue Reading

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Citations

Mar 20, 2001·Journal of Cellular Biochemistry·N J DukerR Ashworth
Jan 1, 1982·Advances in Enzyme Regulation·G W TeeborM S Goldstein
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