5-Formyluracil (fU) is a major thymine lesion produced by reactive oxygen radicals and photosensitized oxidation. Although this residue is a potentially mutagenic lesion and is removed by several base excision repair enzymes, it is unknown whether fU is the substrate
The decomposition of organic hydroperoxides into peroxyl radicals is a potential source of singlet molecular oxygen [O2 (1Deltag)] in biological systems. This study shows that 5-(hydroperoxymethyl)uracil (5-HPMU), a thymine hydroperoxide within DNA, reacts with metal ions or HOCl, generating O2
Journal of the American Society for Mass Spectrometry, 13(10), 1190-1194 (2002-10-22)
2-Aminoimidazolone and 5-formyluracil are major one-electron photooxidation products of guanine and thymine in oligodeoxynucleotides (ODNs). Herein we report the HPLC isolation and tandem mass spectrometric characterization of ODNs carrying those types of base modifications. Collision-activated dissociation (CAD) of the deprotonated
Journal of radiation research, 42(1), 11-19 (2001-06-08)
Ionizing radiation induces a wide variety of modifications to purine and pyrimidine residues. The exocyclic methyl group of thymine does not escape oxidative damage. Any 5-hydroperoxymethyluracil produced is spontaneously decomposed to form 5-formyluracil (5-foU) and 5-hydroxymethyluracil. The yield of 5-foU
Two new 5-formyluracil thiosemicarbazone (H(3)ut) derivatives, Me-H(3)ut (1) and Me(2)-H(3)ut (2), were synthesized by reacting thiosemicarbazides, mono- and dimethylated on the aminic nitrogen, with 5-formyluracil and were subsequently characterized. These ligands, treated with copper chloride and nitrate, afforded three complexes:
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