Alderfer JL, Soni SD, Arakali AV, Wallace JC. UV irradiation of nucleic acids: characterization of photoproducts of thymidylyl-(3'-->5')-2'-deoxy-5-fluorouridine.
Photochem Photobiol 1993;
57:770-6. [PMID:
8337248 DOI:
10.1111/j.1751-1097.1993.tb09209.x]
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Abstract
The acetone-sensitized irradiation using UV-B (ultraviolet light, 280-320 nm; sunlamps) of thymidylyl(3'-->5')deoxyfluorouridine monophosphate produces two main photoproducts. The distribution of these photoproducts is dependent on the pH of the irradiation solution. At pH 6, the cis-syn cyclobutane-type photodimer is the major product, whereas at high pH (8-10) a photoadduct is the major product. These photoproducts have been identified and structurally characterized by H-1 and C-13 NMR spectroscopy. The photoadduct arises from defluorination of the 5-fluorouracil moiety. The structure of the photoadduct maintains the sugar-phosphate backbone of the starting material (d-TpF), and contains a saturated thymine moiety with an added Thy(C6-hydroxyl) and a Thy(C5)-(C5)Ura covalent bond.
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