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Nucleic Acids Research, Vol 25, Issue 4 713-718, Copyright © 1997 by Oxford University Press

ARTICLES

DNA flexibility of the UP element is a major determinant for transcriptional activation at the Escherichia coli acetate promoter

D Negre, C Bonod-Bidaud, C Oudot, JF Prost, A Kolb, A Ishihama, AJ Cozzone and JC Cortay
Institut de Biologie et Chimie des Proteines, Centre National de la Recherche Scientifique, Lyon, France.

The specific interaction of the upstream element-containing promoter of the Escherichia coli acetate operon with either the RNA polymerase holoenzyme or its alpha subunit has been analyzed by the base removal method. Our results indicate that: (i) direct and specific base contacts can be detected in the acetate promoter-alpha subunit complex; (ii) base elimination in the upstream element of the acetate promoter enhances the binding of RNA polymerase. A similar effect is observed when studying the interactions between RNA polymerase and the rrnB ribosomal operon P1 promoter.
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