6S RNA-dependent inhibition of RNA polymerase is released by RNA-dependent synthesis of small de novo products
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Reinhild Wurm
Abstract
6S RNA from Escherichia coli is known to bind to RNA polymerase, preventing interaction with many promoters during stationary growth. The resulting repression is released under conditions of nutritional upshift, when the growth situation improves. 6S RNA, which binds to the active site of RNA polymerase, has the particularly interesting feature to act as a template, causing the transcription of defined de novo RNAs (dnRNA) that are complementary to a specific sequence region of the 6S RNA. We analyzed the conditions of dnRNA synthesis and determined their effect on the 6S RNA-mediated inhibition of RNA polymerase in vitro and in vivo. Upon nutritional upshift the RNA polymerase/6S RNA complex induces the rapid synthesis of dnRNAs, which form stable hybrids with the 6S RNA template. The resulting structural change destabilizes the inactivated RNA polymerase complex, causing σ subunit release. Both dnRNA and 6S RNA are rapidly degraded after complex disintegration. Experiments using the transcriptional inhibitor rifampicin demonstrate that active transcription is required for the disintegration of the RNA polymerase/6S RNA complex. Our results support the conclusion that 6S RNA not only inhibits transcription during stationary growth but also enables cells to resume rapid growth after starvation and help to escape from stationary phase.
©2010 by Walter de Gruyter Berlin New York
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Articles in the same Issue
- EDITORIAL
- Highlight: Signal Transduction and Disease
- HIGHLIGHT: SIGNAL TRANSDUCTION AND DISEASE
- Phosphorylase and the origin of reversible protein phosphorylation
- β-Catenin as a multilayer modulator of zonal cytochrome P450 expression in mouse liver
- Glycome profiling using modern glycomics technology: technical aspects and applications
- Ubiquitin ligase complexes: from substrate selectivity to conjugational specificity
- MAP3K1 functionally interacts with Axin1 in the canonical Wnt signalling pathway
- Signal transduction by the atopy-associated human thymic stromal lymphopoietin (TSLP) receptor depends on Janus kinase function
- GENES AND NUCLEIC ACIDS
- 6S RNA-dependent inhibition of RNA polymerase is released by RNA-dependent synthesis of small de novo products
- PROTEIN STRUCTURE AND FUNCTION
- Analysis of the DNA-binding activity of p53 mutants using functional protein microarrays and its relationship to transcriptional activation
- Peptides from the Mycobacterium tuberculosis Rv1980c protein involved in human cell infection: insights into new synthetic subunit vaccine candidates
- The epimerase activity of anthocyanidin reductase from Vitis vinifera and its regiospecific hydride transfers
- Antibacterial activity of radical scavengers against class Ib ribonucleotide reductase from Bacillus anthracis
- CELL BIOLOGY AND SIGNALING
- Signal transduction in CHO cells stably transfected with domain-selective forms of murine ACE
- The impact of methylmercury on 1,25-dihydroxyvitamin D3-induced transcriptomic responses in dolphin skin cells
- PROTEOLYSIS
- An examination of the proteolytic activity for bovine pregnancy-associated glycoproteins 2 and 12
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