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We examined the effects of neutral salts and the non-ionic solute 2-methyl,-2,4-pentanediol (MPD) on transcript elongation by Escherichia coli RNA polymerase and on pausing induced by the multipartite his leader pause signal. All solutes tested slowed the overall rate of elongation, with anions showing the dominant effects in the order: Although the protein structure-stabilizing anions HPO 4 ...
A central enigma of transcriptional regulation is how the normally efficient transcription elongation complex stops at pause and termination signals. One possibility, raised by the discovery that RNA polymerase sometimes contracts its DNA footprint, is that discontinuous movements contribute to recognizing these signals. We report that E. coli RNA polymerase responds to sequences immediately downstream...
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