title: An OGG1 orthologue encoding a functional 8-oxoguanine DNA glycosylase/lyase in Arabidopsis thaliana.
abstract: Repair of the ubiquitous mutagenic lesion 7,8-dihydro-8-oxoguanine (8-oxoG) is initiated in eukaryotes by DNA glycosylases/lyases, such as yeast Ogg1, that do not share significant sequence identity with their prokaryotic counterparts, typified by Escherichia coli MutM (Fpg) protein. The unexpected presence of a functional mutM orthologue in the model plant Arabidopsis thaliana has brought into question the existence of functional OGG1 orthologues in plants. We report here the cDNA cloning, expression and functional characterization of AtOGG1, an Arabidopsis thaliana gene widely expressed in different plant tissues which encodes a 40.3 kDa protein with significant sequence identity to yeast and human Ogg1 proteins. Purified AtOgg1 enzyme specifically cleaves duplex DNA containing an 8-OxoG:C mispair, and the repair reaction proceeds through an imine intermediate
authors.affiliation: Departamento de Genética, Facultad de Ciencias, Universidad de Córdoba, Spain.
authors.forename: M V
authors.initials: MV
authors.lastname: García-Ortiz
authors.forename: R R
authors.initials: RR
authors.lastname: Ariza
authors.forename: T
authors.initials: T
authors.lastname: Roldán-Arjona
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000201:enzymology / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics; D045647:DNA Glycosylases; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D043382:DNA-Formamidopyrimidine Glycosylase; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins; D015971:Gene Expression Regulation, Enzymologic; D018506:Gene Expression Regulation, Plant; D005816:Genetic Complementation Test; D006147:Guanine / Q000031:analogs & derivatives* / Q000378:metabolism; D008969:Molecular Sequence Data; D009154:Mutation; D009699:N-Glycosyl Hydrolases / Q000235:genetics* / Q000378:metabolism; D010641:Phenotype; D018749:RNA, Plant / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D016415:Sequence Alignment; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D014018:Tissue Distribution
chemical_list: D001426:Bacterial Proteins; D018076:DNA, Complementary; D029968:Escherichia coli Proteins; D018749:RNA, Plant; D011994:Recombinant Proteins; C024829:8-hydroxyguanine; D006147:Guanine; D045647:DNA Glycosylases; D009699:N-Glycosyl Hydrolases; C061738:mutY adenine glycosylase; D043382:DNA-Formamidopyrimidine Glycosylase; C468610:DNA-formamidopyrimidine glycosylase, E coli