TYROSINE-SENSITIZED PHOTODIMERIZATION OF THYMINE IN AQUEOUS SOLUTION |
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| Authors: | Motohisa Kaneko Akio Matsuyama Chikayoshi Nagata |
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| Institution: | Biophysics Division, National Cancer Center Research Institute, Tsukiji, Chuo-ku, Tokyo, Japan |
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| Abstract: | Abstract. Photodimerization of thymine in aqueous solution in the presence of tyrosine was studied with monochromatic UV irradiation. The total dimer formation was sensitized in the presence of tyrosine. The action spectrum of sensitized total dimer formation has a peak near 280 nm corresponding to the absorption maximum of tyrosine. Triplet quenchers reduced the sensitization substantially. It seems probable that tyrosine-sensitized photodimerization of thymine occurred via triplet-triplet energy transfer from tyrosine to thymine. |
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