Chemical structure of 3-carbethoxypsoralen-DNA photoadducts |
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| Authors: | A Moysan F Gaboriau P Vigny L Voituriez J Cadet |
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| Affiliation: | 1. Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA;2. Center for Integrative Proteomics Research, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA;3. Computational Biology & Molecular Biophysics Program, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA;4. Institute for Quantitative Biomedicine, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA |
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| Abstract: | The enzymatic digest from salmon sperm DNA photochemically modified by the monofunctional 3-carbethoxypsoralen was analyzed by high-performance liquid chromatography. The modified nucleosides extracted from DNA were compared with model compounds obtained from irradiation in the dry state of mixtures of 3-carbethoxypsoralen with 2'-deoxyribonucleosides whose chemical structures had previously been characterized. The main photoadducts formed in DNA are two cis-syn diastereoisomers formed via a C4-cycloaddition reaction involving the 4', 5' double bond of 3-carbethoxypsoralen and the 5,6 double bond of 2'-deoxythymidine. Among them, the most polar one accounts for 72%. Under the same conditions, photoadducts formed between 3-carbethoxypsoralen and 2'deoxycytidine account for less than 1%. |
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