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Transcriptional Regulation: Riboswitches01:23

Transcriptional Regulation: Riboswitches

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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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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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Ribosome profiling or ribo-sequencing is a deep sequencing technique that produces a snapshot of active translation in a cell. It selectively sequences the mRNAs protected by ribosomes to get an insight into a cell’s translation landscape at any given point in time.
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Translational Regulation01:29

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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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Probing of Nascent Riboswitch Transcripts.

Adrien Chauvier1, Daniel A Lafontaine2

  • 1Département de Biologie, Faculté des Sciences, Université de Sherbrooke, Sherbrooke, QC, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|September 26, 2015
PubMed
Summary

This study introduces RNase H probing to analyze riboswitch structures in nascent mRNA. This method reveals how riboswitches control gene expression through ligand recognition and structural changes.

Keywords:
Nascent mRNANative structuresRNA structureRNase H probing

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Riboswitches are cis-acting RNA elements regulating gene expression.
  • Understanding native RNA structures is key to RNA-based regulatory mechanisms.
  • Efficient ligand recognition by riboswitches depends on their structure.

Purpose of the Study:

  • To characterize native riboswitch structures and their ligand recognition mechanisms.
  • To investigate riboswitch regulation control in nascent mRNA.
  • To establish RNase H probing as a method for studying riboswitches.

Main Methods:

  • RNase H probing assay.
  • Characterization of nascent mRNA riboswitch molecules.
  • Analysis of RNA domain accessibility in different structural contexts.

Main Results:

  • RNase H probing can determine RNA domain accessibility.
  • The method provides insights into riboswitch structural dynamics.
  • Information on riboswitch regulation control mechanisms was obtained.

Conclusions:

  • RNase H probing is a valuable tool for studying riboswitch structure and function.
  • This technique aids in understanding gene expression regulation by riboswitches.
  • Characterizing nascent mRNA riboswitches offers insights into regulatory control.