title: Bacillus subtilis gene coding for constitutive O6-methylguanine-DNA alkyltransferase.
abstract: We have cloned a Bacillus subtilis DNA fragment that could correct the defect in a constitutive O6-methylguanine-DNA alkyltransferase (Dat1). This fragment also corrected the hypersensitivity of the strain TKJ6951(ada-1 dat-1) to N-methyl-N'-nitro-N-nitrosoguanidine (MNNG). In the fragment, the gene activity resides in a region of about 850 bp which contains an open reading frame capable of coding for a protein of 165 amino acid residues. The amino acid sequence of this protein exhibits striking similarity to those of E. coli O6-methylguanine-DNA alkyltransferases (Ogt and Ada proteins). We conclude that this is a structural gene for the Dat1 protein, which is distinct from inducible DNA alkyltransferases involved in the adaptive response. The dat-1 mutation was shown to be caused by a structural rearrangement affecting the coding region, and the 0.8 kb transcripts of this gene were detected in dat+ cells but not in dat mutant cells.
authors.affiliation: Radiobiology Division, National Cancer Center Research Institute, Tokyo, Japan.
authors.forename: F
authors.initials: F
authors.lastname: Morohoshi
authors.forename: K
authors.initials: K
authors.lastname: Hayashi
authors.forename: N
authors.initials: N
authors.lastname: Munakata
mesh_terms: D001412:Bacillus subtilis / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D001483:Base Sequence; D002702:Chloramphenicol Resistance / Q000187:drug effects; D003001:Cloning, Molecular; D004352:Drug Resistance, Microbial / Q000235:genetics; D004926:Escherichia coli / Q000201:enzymology / Q000235:genetics; D005796:Genes; D005798:Genes, Bacterial; D007700:Kinetics; D008769:Methylnitronitrosoguanidine / Q000494:pharmacology; D008780:Methyltransferases / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D019853:O(6)-Methylguanine-DNA Methyltransferase; D011994:Recombinant Proteins / Q000378:metabolism; D012689:Sequence Homology, Nucleic Acid
chemical_list: D011994:Recombinant Proteins; D008769:Methylnitronitrosoguanidine; D008780:Methyltransferases; D019853:O(6)-Methylguanine-DNA Methyltransferase