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Related Concept Videos

Stringent Response in E. coli01:23

Stringent Response in E. coli

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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Eukaryotic RNA Polymerases00:58

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RNA Polymerase (RNAP) is conserved in all animals, with bacterial, archaeal, and eukaryotic RNAPs sharing significant sequence, structural, and functional similarities. Among the three eukaryotic RNAPs, RNA Polymerase II is most similar to bacterial RNAP in terms of both structural organization and folding topologies of the enzyme subunits. However, these similarities are not reflected in their mechanism of action.
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Bacterial RNA Polymerase00:43

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Transcription Initiation01:47

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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
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Related Experiment Video

Updated: Mar 23, 2026

Essential Components of Borreliella Borrelia burgdorferi In Vitro Transcription Assays
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6S RNA regulates E. coli RNA polymerase activity.

K M Wassarman1, G Storz

  • 1Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA. kwass@box-k.nih.gov

Cell
|July 13, 2000
PubMed
Summary

The function of E. coli 6S RNA was revealed: it binds RNA polymerase, specifically sigma70 and beta/beta

Area of Science:

  • Microbiology
  • Molecular Biology
  • Gene Regulation

Background:

  • The function of E. coli 6S RNA, discovered over 30 years ago, remains largely unknown.
  • Understanding 6S RNA's role is crucial for deciphering bacterial gene regulation.

Purpose of the Study:

  • To elucidate the function of E. coli 6S RNA.
  • To investigate the interaction between 6S RNA and RNA polymerase.

Main Methods:

  • UV crosslinking experiments to identify direct contacts between 6S RNA and RNA polymerase subunits.
  • Analysis of 6S RNA accumulation during different growth phases.
  • Assays to determine the effect of 6S RNA on sigma70-holoenzyme activity and promoter repression.

Main Results:

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  • 6S RNA specifically and efficiently associates with RNA polymerase.
  • Direct contact between 6S RNA and the sigma70 and beta/beta' subunits of RNA polymerase was confirmed.
  • 6S RNA levels increase during the stationary phase, altering RNA polymerase activity.
  • 6S RNA is essential for the stable association of sigma70 with core RNA polymerase.
  • 6S RNA represses transcription from sigma70-dependent promoters in the stationary phase.

Conclusions:

  • 6S RNA plays a critical role in modulating RNA polymerase activity during specific growth phases.
  • The interaction of 6S RNA with RNA polymerase regulates gene expression by affecting sigma70-holoenzyme function.