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• W2153419480 abstract "ABSTRACT Enterococcus faecalis BM4405-1, a susceptible derivative of the VanE-type vancomycin-resistant E. faecalis strain BM4405, was obtained after growth in the presence of novobiocin, an inhibitor of the GyrB subunit of DNA gyrase. In contrast to findings for BM4405, UDP-MurNAc- l -Ala-γ- d -Glu- l -Lys- d -Ala- d -Ala (pentapeptide[ d -Ala]) was the only peptidoglycan precursor found in BM4405-1, and no VanXY E d , d -peptidase or VanT serine racemase activities were detected in that strain, even after induction by subinhibitory concentrations of vancomycin. Sequencing of the vanE operon of BM4405-1 revealed two mutations leading to substitutions in VanE (D200N) and in the C-terminal amino acid of VanR E (Y225F). Cloning of the vanE , vanXY E , and vanT E genes of BM4405-1 into the susceptible E. faecalis strain JH2-2 conferred resistance to vancomycin, indicating that the mutation in vanE was not responsible for susceptibility. Transcriptional analysis of the vanE operon in BM4405 by quantitative reverse transcription-PCR indicated that novobiocin did not affect the expression level of the vanE operon. Sequencing of the gyrB gene of BM4405-1 revealed a mutation responsible for substitution of a residue (K337Y) required for ATPase activity and thus implicated in DNA supercoiling. Cloning of the gyrB gene of BM4405 restored vancomycin resistance to BM4405-1. Taken together, these data suggest that alteration of DNA supercoiling following a mutation in GyrB was responsible for lack of expression of the vanE operon and thus for vancomycin susceptibility in BM4405-1." @default.
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• W2153419480 date "2005-04-01" @default.
• W2153419480 modified "2023-09-25" @default.
• W2153419480 title "Silencing of Glycopeptide Resistance in Enterococcus faecalis BM4405 by Novobiocin" @default.
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• W2153419480 doi "https://doi.org/10.1128/aac.49.4.1419-1425.2005" @default.
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