title: Regulation of the Escherichia coli uvrD gene in vivo.
abstract: The roles of two putative promoter sequences, P1 and P2, and a potential antiterminator sequence found in the uvrD control region were examined in vivo. Constitutive and SOS-induced levels of uvrD mRNA were determined by S1 mapping, and it was shown that the majority of uvrD transcripts are from P1, while P2 plays only a minor role. A series of increasing deletions from the 5' end of the uvrD gene was used to assay transcription in the promoterless vector pKO-1. Loss of just the -35 region of P1 was sufficient to switch off detectable transcription from both P1 and P2. Disruption of the antiterminator by site-specific mutagenesis had no effect on constitutive levels of transcription, but led to a significant increase over wild-type levels following SOS induction. This suggests that the attenuator comes into play following DNA damage to moderate the increase in UvrD protein synthesis.
mesh_terms: D000251:Adenosine Triphosphatases / Q000096:biosynthesis / Q000235:genetics*; D004265:DNA Helicases / Q000096:biosynthesis / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D009154:Mutation; D011401:Promoter Regions, Genetic; D013014:SOS Response, Genetics; D013728:Terminator Regions, Genetic; D014158:Transcription, Genetic
chemical_list: D029968:Escherichia coli Proteins; D000251:Adenosine Triphosphatases; C506746:UvrD protein, E coli; D004265:DNA Helicases