title: Properties and mechanism of action of eukaryotic 3-methyladenine-DNA glycosylases.
abstract: 3-Methyladenine-DNA glycosylase activities have been identified in all eukaryotic cell systems studied. Some of the results from these studies are reviewed here. The enzymes possess molecular weights between 24 X 10(3) and 34 X 10(3), they have a broad pH optimum at approximately pH 8, require double-stranded DNA and act in the absence of any cofactors. The enzyme can excise several different methylated bases from DNA such as 3-methyladenine, 7-methylguanine and 3-methylguanine. The specific activity of this DNA glycosylase in mouse L-cells was found to be a function of the proliferative state of the cell. In vitro quantification of this DNA repair activity in synchronized mouse L-cells suggests that it is regulated within a defined temporal sequence prior to the onset of DNA replication. Using DNA fragments of defined sequences it was observed that the efficiency of removal of the methylated bases is sequence-dependent.
mesh_terms: D000818:Animals; D001483:Base Sequence; D002453:Cell Cycle; D002478:Cells, Cultured; D004247:DNA / Q000378:metabolism; D045647:DNA Glycosylases; D004260:DNA Repair; D004790:Enzyme Induction; D005057:Eukaryotic Cells / Q000166:cytology / Q000201:enzymology; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D051379:Mice; D008970:Molecular Weight; D009699:N-Glycosyl Hydrolases / Q000096:biosynthesis / Q000378:metabolism*; D051381:Rats
chemical_list: D004247:DNA; C021565:3-methyladenine-DNA glycosylase; D045647:DNA Glycosylases; D009699:N-Glycosyl Hydrolases