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Related Concept Videos

Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Bacterial RNA Polymerase00:43

Bacterial RNA Polymerase

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.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...
Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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.
All three eukaryotic RNAPs require specific transcription factors, of which the...
Eukaryotic RNA Polymerases00:58

Eukaryotic RNA Polymerases

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.
All three eukaryotic RNAPs require specific transcription factors, of which the...
Transcription Initiation01:47

Transcription Initiation

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.
The promoters and enhancers and their accessory proteins allow tight regulation of...
RNA Polymerase II Accessory Proteins02:36

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

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Related Experiment Video

Updated: May 24, 2026

Using Microtiter Dish Radiolabeling for Multiple In Vivo Measurements Of Escherichia coli (p)ppGpp Followed by Thin Layer Chromatography
06:30

Using Microtiter Dish Radiolabeling for Multiple In Vivo Measurements Of Escherichia coli (p)ppGpp Followed by Thin Layer Chromatography

Published on: June 4, 2019

ppGpp: magic beyond RNA polymerase.

Zachary D Dalebroux1, Michele S Swanson

  • 1Department of Microbiology, University of Washington, Health Sciences Building K116, 1959 NE Pacific St., Box 357710, Seattle, Washington 98195-7710, USA.

Nature Reviews. Microbiology
|February 17, 2012
PubMed
Summary
This summary is machine-generated.

Bacteria use the molecule guanosine tetraphosphate (ppGpp) to survive stress by altering gene expression. This study explores how ppGpp also regulates other cellular processes beyond its known effects on RNA polymerase.

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Using Microtiter Dish Radiolabeling for Multiple In Vivo Measurements Of Escherichia coli (p)ppGpp Followed by Thin Layer Chromatography
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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Physiology

Background:

  • Bacteria employ complex physiological adaptations to survive environmental stress.
  • The small alarmone molecule guanosine tetraphosphate (ppGpp) is a key regulator of the bacterial stress response.
  • ppGpp is primarily known for its role in modulating RNA polymerase activity and gene expression.

Purpose of the Study:

  • To provide an overview of ppGpp biosynthesis and its direct impact on RNA polymerase-promoter interactions.
  • To explore the diverse roles of ppGpp in bacterial stress adaptation beyond direct transcriptional regulation.
  • To discuss mechanisms by which ppGpp influences protein and regulatory RNA synthesis, stability, and activity.

Main Methods:

  • Literature review and synthesis of existing research on ppGpp.
  • Analysis of ppGpp's known regulatory functions in bacterial stress response.
  • Discussion of experimental evidence supporting ppGpp's non-transcriptional roles.

Main Results:

  • ppGpp biosynthesis is a critical response to various cellular stresses.
  • ppGpp redirects RNA polymerase to specific gene promoters, enhancing stress resilience.
  • Bacteria utilize ppGpp to modulate protein and regulatory RNA dynamics through diverse mechanisms.

Conclusions:

  • ppGpp is a multifaceted signaling molecule essential for bacterial adaptation to challenging environments.
  • Understanding ppGpp's broader regulatory network offers insights into bacterial survival strategies.
  • Mechanisms of ppGpp action extend beyond direct modulation of RNA polymerase activity.