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Related Concept Videos

Riboswitches01:56

Riboswitches

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Riboswitches are non-coding mRNA domains that regulate the transcription and translation of downstream genes without the help of proteins. Riboswitches bind directly to a metabolite and can form unique stem-loop or hairpin structures in response to the amount of the metabolite present. They have two distinct regions – a metabolite-binding aptamer and an expression platform.
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Types of RNA01:23

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Types of RNA01:20

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Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
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Transcriptional Regulation: Riboswitches01:23

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Riboswitches are RNA elements that regulate gene expression by altering their secondary structures in response to specific effector molecules. These elements, located in the leader regions of certain mRNAs, act as transcriptional regulators by toggling between alternative conformations to control downstream gene expression. Riboswitch-mediated regulation is a precise mechanism for modulating biosynthetic pathways, as exemplified by the riboflavin biosynthesis pathway in Bacillus...
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Translational Regulation01:29

Translational Regulation

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Translational regulation in prokaryotes ensures efficient protein synthesis by controlling ribosome access to mRNA. This regulation is mediated by secondary RNA structures, including translational riboswitches, RNA thermometers, and small RNAs (sRNAs), which respond to intracellular and environmental signals to modulate gene expression.Translational RiboswitchesRiboswitches in the leader region of mRNAs can regulate translation by altering the accessibility of the Shine-Dalgarno (SD) sequence,...
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Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Nanomanipulation of Single RNA Molecules by Optical Tweezers
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Second messenger - Sensing riboswitches in bacteria.

Arati Ramesh1

  • 1National Center for Biological Sciences, GKVK Campus, Bellary Road, Bangalore 560065, India.

Seminars in Cell & Developmental Biology
|October 24, 2015
PubMed
Summary

Bacteria use RNA molecules, not just proteins, to sense signals. This review explores how these RNA sensors regulate bacterial development, community behavior, and life cycle choices.

Keywords:
BiofilmsDifferentiationRiboswitchSecond messengerSporulation

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Genetics

Background:

  • Bacterial signal sensing traditionally relies on proteins.
  • Emerging evidence highlights the crucial role of RNA molecules in bacterial sensing.
  • RNA-based sensing is increasingly recognized as a key regulatory mechanism.

Purpose of the Study:

  • To review the role of signal sensing RNAs in bacterial development.
  • To discuss how RNAs regulate bacterial community formation, lifestyle choices, and spore formation.
  • To elucidate the molecular mechanisms of RNA-mediated signal perception.

Main Methods:

  • Literature review of studies on bacterial RNA sensing.
  • Analysis of signaling molecules, sensing RNAs, and their interactions.
  • Discussion of molecular mechanisms underlying signal-response pathways.

Main Results:

  • Signal sensing RNAs play significant roles in bacterial developmental processes.
  • Specific RNAs are shown to sense various signaling molecules.
  • These RNA-based systems govern critical bacterial behaviors and life cycle transitions.

Conclusions:

  • RNA-based signal sensing is a fundamental mechanism in bacteria.
  • Understanding these RNA regulators is key to comprehending bacterial behavior and development.
  • This regulatory layer expands our view of bacterial communication and adaptation.