title: [Characteristics of Escherichia coli K-12 mutants with altered effectiveness of excision of Tn5 and Tn9 transposons].
abstract: The properties of Escherichia coli K-12 mutans HFETn5, HFETn9 and LFETn9 have been studied. The majority of mutations were shown to have pleiotropic effect. Some of them increase cell sensitivity to UV light and mitomycin C and affect efficiency of homologous recombination in transduction and conjugation. The level of spontaneous mutagenesis is increased in a number of mutants. None of the mutations isolated affect frequency of transposition of Tn5 from bacteriophage lambda::Tn5 into the chromosome. Based on analysis of properties of hfeTn5-09 and hfeTn9 mutations and on the date of preliminary mapping of hfeTn5-09 mutation, these mutations were considered to be novel. It is shown that the processes of precise excision of Tn5 and Tn9 transposons may be accomplished by at least two pathways, one of them being dependent on recA gene functions.
authors.forename: E K
authors.initials: EK
authors.lastname: Mukhamedshin
authors.forename: V A
authors.initials: VA
authors.lastname: Tarasov
mesh_terms: D004249:DNA Damage; D004251:DNA Transposable Elements; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000528:radiation effects; D005798:Genes, Bacterial; D016685:Mitomycin; D008937:Mitomycins / Q000633:toxicity; D009154:Mutation; D011995:Recombination, Genetic; D014466:Ultraviolet Rays
chemical_list: D004251:DNA Transposable Elements; D008937:Mitomycins; D016685:Mitomycin
vernacular_title: Kharakteristika mutantov Escherichia coli K-12 s izmenennoĭ éffektivnost'iu tochnogo vyrezaniia transpozonov Tn5 i Tn9.