NDLI: Synthesis of the diastereomers of thymidine glycol, determination of concentrations and rates of interconversion of their cis-trans epimers at equilibrium and demonstration of differential alkali lability within DNA.

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Synthesis of the diastereomers of thymidine glycol, determination of concentrations and rates of interconversion of their cis-trans epimers at equilibrium and demonstration of differential alkali lability within DNA.

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Synthesis of the diastereomers of thymidine glycol, determination of concentrations and rates of interconversion of their cis-trans epimers at equilibrium and demonstration of differential alkali lability within DNA.

Content Provider	PubMed Central
Author	Lustig, M. J. Cadet, J. Boorstein, R. J. Teebor, G. W.
Abstract	5,6-dihydroxy-5,6-dihydrothymidine (thymidine glycol) is a major product of the reaction of thymidine with reactive oxygen species, including those generated by ionizing radiation. Thymidine glycol exists as 2 diastereomeric pairs by virtue of the chirality of the C(5) and C(6) atoms. A simple procedure is described for synthesizing and purifying each of the diastereomeric pairs separately. After brominating thymidine, the two trans 5-bromo-6-hydroxy-5,6-dihydrothymidine (thymidine bromohydrin) C(5) diastereomers were easily separated by High Performance Liquid Chromatography. Each thymidine bromohydrin was quantitatively converted to the corresponding diastereomeric thymidine glycol pair by reflux in aqueous solution. The concentrations at equilibrium of the cis (5S,6R),(5R,6S) and trans (5S,6S),(5R,6R) forms of the thymidine glycol diastereomers were determined and were 80% cis and 20% trans for the 5S pair and 87% cis and 13% trans for the 5R pair. At equilibrium, the rate of cis-trans epimerization of the two sets of diastereomers was essentially identical. The 5S diastereomeric pair was significantly more alkali labile than the 5R pair due to the higher concentration of the 5S trans epimer at equilibrium. This differential alkali lability was also manifest when the thymine glycol moiety was present in chemically oxidized poly(dA-dT).poly(dA-dT) indicating that the chemical differences between the diastereomeric pairs are preserved in DNA. These chemical differences may affect the biological properties of this important oxidative derivative of thymine in DNA.
Starting Page	4839
File Format	PDF
ISSN	13624962
e-ISSN	13624962
Journal	Nucleic Acids Research
Issue Number	18
Volume Number	20
Language	English
Publisher Date	1992-09-25
Access Restriction	Open
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Genetics

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