Search results for "N-Glycosyl Hydrolases"

showing 3 items of 13 documents

Interference by toxic metal ions with zinc-dependent proteins involved in maintaining genomic stability.

2002

Metal ions are essential components of biological systems; nevertheless, even essential elements may have toxic or carcinogenic properties. Thus, besides As(III) and Cd(II), also Ni(II) and Co(II) have been shown previously to disturb different types of DNA repair systems at low, non-cytotoxic concentrations. Since some metals exert high affinities for SH groups, we investigated whether zinc finger structures in DNA-binding motifs of DNA repair proteins are potential targets for toxic metal ions. The bacterial formamidopyrimidine-DNA glycosylase (Fpg protein) involved in base excision repair was inhibited by Cd(II), Cu(II) and Hg(II) with increasing efficiencies, whereas Co(II), As(III), Pb…

Protein FoldingDNA RepairDNA repairCations DivalentPoly ADP ribose polymeraseToxicologymedicine.disease_causechemistry.chemical_compoundMetals HeavymedicineMetallothioneinHumansN-Glycosyl HydrolasesChemistryRNA-Binding ProteinsZinc FingersGeneral MedicineBase excision repairXeroderma Pigmentosum Group A ProteinDNA-Binding ProteinsZincBiochemistryDNA glycosylaseZinc toxicityDNAFood ScienceNucleotide excision repairFood and chemical toxicology : an international journal published for the British Industrial Biological Research Association
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Age-related and tissue-specific accumulation of oxidative DNA base damage in 7,8-dihydro-8-oxoguanine-DNA glycosylase (Ogg1) deficient mice.

2001

Mutations that influence the repair of oxidative DNA modifications are expected to increase the steady-state (background) levels of these modifications and thus create a mutator phenotype that predisposes to malignant transformation. We have analysed the steady-state levels and repair kinetics of oxidative DNA modifications in cells of homozygous ogg1(-/-) null mice, which are deficient in Ogg1 protein, a DNA repair glycosylase that removes the miscoding base 8-hydroxyguanine (8-oxoG) from the genome. Oxidative purine modifications including 8-oxoG were quantified by means of an alkaline elution assay in combination with Fpg protein, the bacterial functional analogue of Ogg1 protein. In pri…

PurineMaleCancer ResearchGuanineDNA RepairOxidative phosphorylationBiologymedicine.disease_causeMalignant transformationchemistry.chemical_compoundMiceTranscription (biology)medicineAnimalsN-Glycosyl HydrolasesMice KnockoutCell growthAge FactorsGeneral MedicineDNAFibroblastsMolecular biologyOxygenOxidative StresschemistryDNA-Formamidopyrimidine GlycosylaseDNA glycosylaseOrgan SpecificityImmunologyHepatocytesOxidative stressDNACell DivisionDNA DamageCarcinogenesis
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Influence of agents that act on DNA and RNA synthesis on the activity of poly(ADP-Rib) polymerase

1975

The activity of poly(ADP-Rib) polymerase is enhanced in the presence of spermine and spermidine. Among the adenosine-like antibiotics tested, only formycin B and showdomycin cause an inhibition of the enzyme, which is competitive to NAD. The activity of poly(ADP-Rib) polymerase is not reduced by rifamycin, alpha-amanitin and 2-phenylethanol.

SpermidineShowdomycinSpermineCoturnixOviductsShowdomycinCellular and Molecular Neurosciencechemistry.chemical_compoundNAD+ NucleosidaseEthidiumpolycyclic compoundsAnimalsN-Glycosyl HydrolasesMolecular BiologyPolymeraseCell NucleusPharmacologychemistry.chemical_classificationbiologyAdenineRifamycinDNATemplates GeneticCell BiologyMolecular biologySpermidineKineticsEnzymechemistryBiochemistrybiology.proteinRNAMolecular MedicineFemaleSpermineNAD+ kinaseFormycinsDNAExperientia
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