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- W1555878818 abstract "Abstract The lytic-lysogenic switch in transposable, Mu-like bacteriophage D108 is governed by two divergent and slightly overlapping transcription units originating from the Pe and Pc promoters. DNase I footprinting and in vivo mutational analysis suggest that lysogeny is maintained by c-repressor occupancy of the O2 operator, which precludes RNA polymerase from binding to Pe. Lytic development is controlled by the Ner repressor, which binds to a site symmetrically situated between the converging promoters and, in the absence of other factors, prevents RNA polymerase from binding to either Pc or Pe. DNase I protection and potassium permanganate hypersensitivity in the presence of integration host factor (IHF), which binds and alters the DNA structure upstream of Pe, revealed that RNA polymerase was able to bind Pe irrespective of the Ner.DNA-bound complex, and partially unwind the Pe -10 region. Ner repression of Pe transcription in vitro was significantly more effective in the absence of IHF. Using a cloned D108 early region-lacZ fusion in IHF-deficient and -proficient backgrounds, we also demonstrate this host factor's affect on ner-repressed Pe in vivo, and generate a system for isolating mutants in the regulatory genes and sites controlling this genetic switch. D108 lytic growth is proposed to occur through IHF-mediated activation of the phage Ner-repressed early operon." @default.
- W1555878818 created "2016-06-24" @default.
- W1555878818 creator A5015910687 @default.
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- W1555878818 date "1992-09-01" @default.
- W1555878818 modified "2023-09-29" @default.
- W1555878818 title "Integration host factor activates the Ner-repressed early promoter of transposable Mu-like phage D108." @default.
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- W1555878818 doi "https://doi.org/10.1016/s0021-9258(19)37118-2" @default.
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