Molecular analysis of the aidD6::Mu d1 (bla lac) fusion mutation of Escherichia coli K12.
In this report we present genetic and biochemical evidence indicating that the aidD6::Mu d1 (bla lac) fusion is an insertion of Mu d1 (bla lac) into the alkB coding sequence. We describe the phenotypic effects resulting from this mutation and compare them with the effects of alkB22, alkA and ada mutations. We also constructed an alkA alkB double mutant and compared its phenotype with that of the single mutant strains. The observation that the methyl methanesulfonate (MMS) and N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) resistance of the double mutant is approximately at the level predicted from the additive sensitivity of each of the single mutants suggests that these two gene products act in different pathways of DNA repair.
Department of Molecular Genetics and Microbiology, University of Massachusetts Medical School, Worcester 01655.
M R
MR
Volkert
L I
LI
Hajec
D000478:Alkylation; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics*; D005816:Genetic Complementation Test; D008741:Methyl Methanesulfonate / Q000633:toxicity; D008769:Methylnitronitrosoguanidine / Q000633:toxicity; D009154:Mutation; D010641:Phenotype; D015183:Restriction Mapping; D013045:Species Specificity
D008769:Methylnitronitrosoguanidine; D008741:Methyl Methanesulfonate