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- W2125603305 abstract "Serratia marcescens encodes an inducible, chromosomal β-lactamase, ampC. Studies addressing the regulation of inducible ampC genes have focused primarily on Enterobacter cloacae and Citrobacter freundii. The purpose of this study was to clone and sequence the ampC, ampR and intergenic region of S. marcescens and examine both inducible and basal level ampC expression. Sequence analysis of the S. marcescens ampC gene identified an extended 5′ untranslated region (UTR) of 126 nucleotides, which formed a prominent stem–loop structure. Induction of ampC expression required AmpR, and the start of transcription was determined using primer extension analysis. In vivo half-life analysis revealed that the half-life of the S. marcescensampC transcript was 7 min. Confirmation of the in vivo half-life and the role of the stem–loop structure in the 5′ UTR was demonstrated by comparing transcript half-life and luciferase expression between a wild-type (WT) and a 5′ UTR stem–loop deletion mutant. These data demonstrated that the stem–loop structure was involved in transcript stability. Taken together, these findings indicate that constitutive expression of S. marcescensampC is regulated by both transcriptional initiation and post-transcriptional events." @default.
- W2125603305 created "2016-06-24" @default.
- W2125603305 creator A5080386872 @default.
- W2125603305 date "2003-02-25" @default.
- W2125603305 modified "2023-09-25" @default.
- W2125603305 title "Analyses of ampC gene expression in Serratia marcescens reveal new regulatory properties" @default.
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- W2125603305 doi "https://doi.org/10.1093/jac/dkg133" @default.
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