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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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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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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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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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Optical Tweezers to Study RNA-Protein Interactions in Translation Regulation
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switchSENSE: A new technology to study protein-RNA interactions.

Antoine Cléry1, Thibault J M Sohier1, Thomas Welte2

  • 1Institute of Molecular Biology and Biophysics, Department of Biology, ETH Zurich, CH-8093 Zurich, Switzerland.

Methods (San Diego, Calif.)
|March 14, 2017
PubMed
Summary

The switchSENSE technology effectively quantifies RNA-binding protein (RBP) interactions, offering an alternative to SPR and ITC. This label-free method uses minimal sample, providing accurate binding affinity data for gene expression studies.

Keywords:
InteractionK(D)KineticsProteinRNAswitchSENSE

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Area of Science:

  • Molecular Biology
  • Biophysics

Background:

  • Understanding RNA-binding protein (RBP) interactions is crucial for elucidating gene expression regulation.
  • Traditional methods like Isothermal Titration Calorimetry (ITC) and Surface Plasmon Resonance (SPR) quantify RNA-protein complex affinity.
  • Structural studies provide atomic-level insights into these vital molecular interactions.

Purpose of the Study:

  • To evaluate the suitability of the switchSENSE technology for studying RNA-protein interactions.
  • To compare switchSENSE-derived binding affinities with established methods like SPR and ITC.
  • To explore the potential of switchSENSE for characterizing RNA-binding protein dynamics.

Main Methods:

  • Utilized the switchSENSE technology to investigate the binding of three distinct RNA-binding proteins (Fox-1, SRSF1, Tra2-β1) to RNA.
  • Quantified the dissociation constants (KD) for these RNA-protein complexes.
  • Compared the obtained KD values with previously reported data from SPR and ITC.

Main Results:

  • Successfully applied switchSENSE to characterize the binding of three different RBPs to RNA.
  • Obtained dissociation constant (KD) values that closely matched those determined by SPR and ITC.
  • Demonstrated switchSENSE's capability to measure binding affinities across a wide range, from micromolar to picomolar.

Conclusions:

  • switchSENSE technology is a viable and attractive alternative for studying RNA-protein interactions.
  • The method's label-free nature and low sample requirements enhance its utility.
  • switchSENSE holds potential for investigating conformational changes during RBP-RNA binding.