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• W2069142566 endingPage "806" @default.
• W2069142566 startingPage "792" @default.
• W2069142566 abstract "Sequence alignments of promoters in prokaryotes postulated that the frequency of occurrence of a base pair at a given position of promoter elements reflects its contribution to intrinsic promoter strength. We directly assessed the contribution of the four base pairs in each position in the intrinsic promoter strength by keeping the context constant in Escherichia coli cAMP-CRP (cAMP receptor protein) regulated gal promoters by in vitro transcription assays. First, we show that base pair frequency within known consensus elements correlates well with promoter strength. Second, we observe some substitutions upstream of the ex-10 TG motif that are important for promoter function. Although the galP1 and P2 promoters overlap, only three positions where substitutions inactivated both promoters were found. We propose that RNA polymerase binds to the − 12T base pair as part of double-stranded DNA while opening base pairs from − 11A to + 3 to form the single-stranded transcription bubble DNA during isomerization. The cAMP-CRP complex rescued some deleterious substitutions in the promoter region. The base pair roles and their flexibilities reported here for E. coli gal promoters may help construction of synthetic promoters in gene circuitry experiments in which overlapping promoters with differential controls may be warranted." @default.
• W2069142566 created "2016-06-24" @default.
• W2069142566 creator A5018779871 @default.
• W2069142566 creator A5088321531 @default.
• W2069142566 creator A5089867508 @default.
• W2069142566 date "2015-02-01" @default.
• W2069142566 modified "2023-10-18" @default.
• W2069142566 title "Differential Role of Base Pairs on gal Promoters Strength" @default.
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