Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 101, Issue 51, Pages 17777-17782Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0404305101
Keywords
transcription; sigma(70); NusA; chromatin immunoprecipitation
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We examine the association of the beta-, alpha-, and sigma(70)-subunits of Escherichia coli RNA polymerase (RNAP) and the NusA elongation factor with transcribed regions in vivo by using chromatin immunoprecipitation. RNAP preferentially associates with the promoter-proximal region of several operons, and this preference is particularly pronounced at the lexA-dinF promoter. When cells are grown in exponential phase, little or no 0,70 is associated with RNAP during early elongation. However, during stationary phase, 01 70 is retained in a fraction of elongating RNAP complexes throughout the melAB operon. In contrast, sigma(70) is not observed in elongating RNAP complexes at the lacZYA operon during stationary phase. At both operons, NusA associates with RNAP during early elongation, and this association is greatly reduced during stationary phase. These observations suggest that in vivo association of sigma(70) and NusA with elongating RNAP is regulated by growth conditions.
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