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• W2156271710 abstract "The ability of curved DNA upstream of the -35 region to affect the interaction of Escherichia coli RNA polymerase and promoter DNA was examined through the use of hybrid promoters. These promoters were constructed by substituting the curved DNA from two Bacillus subtilis bacteriophage SP82 promoters for the comparable DNA of the bacteriophage lambda promoters lambda pR and lambda pL. The SP82 promoters possessed intrinsic DNA curvature upstream of their -35 regions, as characterized by runs of adenines in phase with the helical repeat. In vitro, the relative affinities of purified sigma 70-RNA polymerase for the promoters were determined in a competition binding assay. Hybrid promoters derived from lambda pR that contained curved DNA were bound by E. coli RNA polymerase more efficiently than was the original lambda pR. Binding of E. coli RNA polymerase to these hybrid promoters was favored on superhelical DNA templates according to gel retardation analysis. Both the supercoiled and relaxed forms of the hybrid lambda pL series were better competitors for E. coli RNA polymerase binding than was the original lambda pL. The results of DNase I footprinting analysis provided evidence for the wrapping of the upstream curved DNA of the hybrid lambda pR promoters around the E. coli RNA polymerase in a tight, nucleosomal-like fashion. The tight wrapping of the upstream DNA around the polymerase may facilitate the subsequent steps of DNA untwisting and strand separation." @default.
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• W2156271710 date "1995-10-01" @default.
• W2156271710 modified "2023-10-09" @default.
• W2156271710 title "Role of curved DNA in binding of Escherichia coli RNA polymerase to promoters" @default.
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• W2156271710 doi "https://doi.org/10.1128/jb.177.20.5756-5761.1995" @default.
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