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• W2061826699 endingPage "1951" @default.
• W2061826699 startingPage "1946" @default.
• W2061826699 abstract "Mutants of Enterobacter cloacae 55 were studied to delineate more completely the genetics of inducible expression of AmpC beta-lactamase. E. cloacae 55M-L, derived by mutagenesis from a mutant with high-level cefotaxime resistance (MIC, greater than 64 micrograms/ml), E. cloacae 55M, demonstrated a novel phenotype by producing only low levels of AmpC constitutively. Neither the parental phenotype of E. cloacae 55M nor the wild-type phenotype of E. cloacae 55 could be restored in E. cloacae 55M-L by the introduction of functional ampR, ampC, or ampD genes. Cloning each of these genes from E. cloacae 55M-L confirmed the same genotype for this mutant as for its parental strain. Mutation of E. cloacae 55M-L to the E. cloacae 55M phenotype was found to occur spontaneously at a frequency of 10(-8). All such revertants demonstrated an inducible wild-type phenotype after introduction of a functional ampD. These results suggested that the E. cloacae 55M-L phenotype was due to a mutation in an as yet unrecognized gene, designated ampG. Verification of this gene was obtained by the restoration of the E. cloacae 55M phenotype in E. cloacae 55M-L by introduction of a cloned 2.9-kilobase BamHI fragment from the E. cloacae 55 chromosome. Transformation of both ampG and ampD into E. cloacae 55M-L reconstituted the inducible wild-type phenotype. These results indicate that ampG is required for the activation of ampC by AmpR. Without ampG, neither induction nor high-level expression of AmpC is possible. It is likely that the ampG gene product and AmpD together modulate the ability of AmpR to activate ampC expression." @default.
• W2061826699 created "2016-06-24" @default.
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• W2061826699 date "1989-11-01" @default.
• W2061826699 modified "2023-09-25" @default.
• W2061826699 title "ampG is essential for high-level expression of AmpC beta-lactamase in Enterobacter cloacae" @default.
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• W2061826699 doi "https://doi.org/10.1128/aac.33.11.1946" @default.
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