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• W2169743329 endingPage "2982" @default.
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• W2169743329 abstract "The lack of a generalized mutagenesis system for Haemophilus ducreyi has hampered efforts to identify virulence factors expressed by this sexually transmitted pathogen. To address this issue, the transposable element Tn1545-delta 3, which encodes resistance to kanamycin, was evaluated for its ability to insert randomly into the H. ducreyi chromosome and produce stable, isogenic mutants. Electroporation of H. ducreyi with 1 microgram of plasmid pMS1 carrying Tn1545-delta 3 resulted in the production of 10(4) kanamycin-resistant transformants; Southern blot analysis of a number of these transformants indicated that insertion of the transposon into the chromosome occurred at a number of different sites. This pMS1-based transposon delivery system was used to produce an H. ducreyi mutant that expressed an altered lipooligosaccharide (LOS). Passage of this mutant in vitro in the presence or absence of kanamycin did not affect the stability of the transposon insertion. To confirm that the observed mutant phenotype was the result of the transposon insertion, a chromosomal fragment containing Tn1545-delta 3 was cloned from this H. ducreyi LOS mutant. Electroporation of the wild-type H. ducreyi strain with this DNA fragment yielded numerous kanamycin-resistant transformants, the majority of which had the same altered LOS phenotype as the original mutant. Southern blot analysis confirmed the occurrence of proper allelic exchange in the LOS-deficient transformants obtained in this backcross experiment. The ability of Tn1545-delta 3 to produce insertion mutations in H. ducreyi should facilitate genetic analysis of this pathogen." @default.
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• W2169743329 date "1995-08-01" @default.
• W2169743329 modified "2023-10-16" @default.
• W2169743329 title "A system for generalized mutagenesis of Haemophilus ducreyi" @default.
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• W2169743329 doi "https://doi.org/10.1128/iai.63.8.2976-2982.1995" @default.
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