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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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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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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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Related Experiment Video

Updated: Apr 29, 2026

Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis
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Fluorescence tools to investigate riboswitch structural dynamics.

Patrick St-Pierre1, Kaley McCluskey2, Euan Shaw2

  • 1RNA Group, Department of Biology, Faculty of Science, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada.

Biochimica Et Biophysica Acta
|May 28, 2014
PubMed
Summary
This summary is machine-generated.

This review explores fluorescence techniques for studying riboswitch dynamics. It highlights methods like 2-aminopurine (2AP) for short-range changes and Förster resonance energy transfer (FRET) for long-range structural dynamics.

Keywords:
FluorescenceForster resonance energy transferRNA conformational changeRiboswitchSingle-molecule FRET

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Structural Biology

Background:

  • Riboswitches are genetic regulatory elements controlling gene expression via metabolite binding.
  • Aptamers, conserved domains within riboswitches, fold into complex structures for specific metabolite recognition.
  • Understanding aptamer folding and ligand binding mechanisms is crucial for deciphering gene regulation.

Approach:

  • This review summarizes fluorescence-based techniques for investigating riboswitch structural dynamics.
  • Methods discussed include fluorescent nucleotide analogues, such as 2-aminopurine (2AP), for probing short-range conformational changes.
  • Förster resonance energy transfer (FRET) is detailed for studying long-range structural dynamics, particularly in single-molecule contexts.

Key Points:

  • Fluorescent nucleotide analogues (e.g., 2AP) offer insights into steady-state and time-resolved short-range conformational changes.
  • Single-molecule Förster resonance energy transfer (smFRET) is a powerful tool for observing long-range structural rearrangements.
  • Recent advancements combine smFRET with chemical denaturation for enhanced structural analysis of riboswitches.

Conclusions:

  • Fluorescence spectroscopy provides a versatile toolkit for dissecting riboswitch structural dynamics at various scales.
  • These techniques are essential for understanding the mechanistic basis of metabolite-dependent gene regulation.
  • Continued development of fluorescence methods will further illuminate riboswitch function and facilitate novel applications.