title: Construction of an Escherichia coli K-12 ada deletion by gene replacement in a recD strain reveals a second methyltransferase that repairs alkylated DNA.
abstract: We constructed an ada deletion by gene replacement in a recD1014 strain of Escherichia coli. Characterization of a delta ada-25 recD+ strain revealed the presence of a second DNA methyltransferase activity in E. coli K-12 which transfers a methyl group from methylated DNA to a protein with a molecular weight of 18,000 to 20,000.
authors.affiliation: Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.
authors.forename: D E
authors.initials: DE
authors.lastname: Shevell
authors.forename: A M
authors.initials: AM
authors.lastname: Abou-Zamzam
authors.forename: B
authors.initials: B
authors.lastname: Demple
authors.forename: G C
authors.initials: GC
authors.lastname: Walker
mesh_terms: D000478:Alkylation; D001426:Bacterial Proteins / Q000235:genetics*; D002872:Chromosome Deletion; D004260:DNA Repair; D004269:DNA, Bacterial / Q000378:metabolism*; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics*; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D008745:Methylation; D008780:Methyltransferases / Q000378:metabolism*; D009154:Mutation; D019853:O(6)-Methylguanine-DNA Methyltransferase; D014157:Transcription Factors
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D014157:Transcription Factors; D008780:Methyltransferases; C045675:Ada protein, E coli; D019853:O(6)-Methylguanine-DNA Methyltransferase