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• W1517340766 abstract "We measured the activities of 50 operon fusions from a collection of mutant and wild-type rrnB P1 (rrnB1p in the nomenclature of B. J. Bachmann and K. B. Low [Microbiol. Rev. 44:1-56, 1980]) promoters under different nutritional conditions in order to analyze the DNA sequence determinants of growth rate-dependent regulation of rRNA transcription in Escherichia coli. Mutants which deviated from the wild-type -10 or -35 hexamers or from the wild-type 16-base-pair spacer length between the hexamers were unregulated, regardless of whether the mutations brought the promoters closer to the E. coli promoter consensus sequence and increased activity or whether the changes took the promoters further away from the consensus and reduced activity. These data suggest that rRNA promoters have evolved to maintain their regulatory abilities rather than to maximize promoter strength. Some double substitutions outside the consensus hexamers were almost completely unregulated, while single substitutions at several positions outside the -10 and -35 consensus hexamers exerted smaller but significant effects on regulation. These studies suggest roles for specific promoter sequences and/or structures in interactions with regulatory molecules and suggest experimental tests for models of rRNA regulation." @default.
• W1517340766 created "2016-06-24" @default.
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• W1517340766 date "1989-09-01" @default.
• W1517340766 modified "2023-10-15" @default.
• W1517340766 title "Identification of promoter mutants defective in growth-rate-dependent regulation of rRNA transcription in Escherichia coli" @default.
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• W1517340766 doi "https://doi.org/10.1128/jb.171.9.4862-4870.1989" @default.
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