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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Josaitis, C. A. Gourse, R. L. Gaal, T. |
| Description | Author Affiliation: Josaitis CA ( Department of Bacteriology, University of Wisconsin, Madison 53706.); |
| Abstract | Escherichia coli uses at least two regulatory systems, stringent control and growth-rate-dependent control, to adjust rRNA output to amino acid availability and the steady-state growth rate, respectively. We examined transcription from rrnB P1 promoters containing or lacking the cis-acting UP element and FIS protein binding sites after amino acid starvation. The 'core promoter' responds to amino acid starvation like the full-length wild-type promoter; thus, neither the UP element nor FIS plays a role in stringent control. To clarify the relationship between growth-rate-dependent regulation and stringent control, we measured transcription from growth-rate-independent promoters during amino acid starvation. Four rrnB P1 mutants defective for growth-rate control and two other growth-rate-independent promoters (rrnB P2 and pS10) still displayed stringent regulation. Thus, the two systems have different promoter determinants, consistent with the idea that they function by different mechanisms. Two mutations disrupted stringent control of rrnB P1: (i) a multiple base change in the 'discriminator' region between the -10 hexamer and the transcription start site and (ii) a double substitution making the promoter resemble the E sigma 70 consensus promoter. These results have important implications for the mechanisms of both stringent control and growth-rate-dependent control of rRNA transcription. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 4 |
| Volume Number | 92 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1995-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Escherichia Coli Genetics Gene Expression Regulation, Bacterial Promoter Regions, Genetic Cell Division DNA, Bacterial Growth & Development Molecular Sequence Data Mutation Transcription, Genetic RRNA Operon Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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