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The oxidation of the thymine methyl group can generate 5-formyluracil (FoU). Template FoU residues are known to miscode, generating base substitution mutations. The repair of the FoU lesion is therefore important in minimizing mutations induced by DNA oxidation. We have studied the repair of FoU in synthetic oligonucleotides when paired with A and G. In E. coli cell extract, the repair of FoU is four...
5-Formyluracil is a mutagenic base formed in DNA by oxidation of the thymine methyl group. Whereas the thymine methyl group is electron donating, the formyl group is electron withdrawing, predicting increased ionization of the N-3 imino proton under physiological conditions. The pK a values of a series of 5-substituted uracil and deoxyuridine derivatives have been measured. A linear relationship...
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