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Interbase-FRET binding assay for pre-microRNAs.

Mattias Bood1,2, Anna Wypijewska Del Nogal3, Jesper R Nilsson3

  • 1Department of Chemistry and Molecular Biology, University of Gothenburg, 412 96, Gothenburg, Sweden.

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Researchers developed a new FRET assay to detect small molecules binding to microRNA precursors. This method aids in discovering microRNA inhibitors for disease treatment and understanding microRNA functions.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Drug Discovery

Background:

  • Aberrant microRNA (miR) expression is implicated in various human diseases.
  • Small-molecule inhibitors of miR biogenesis offer potential for therapeutic applications and mechanistic studies.
  • Targeting miR biogenesis is a promising strategy for developing novel therapeutics.

Purpose of the Study:

  • To develop a novel Förster resonance energy transfer (FRET)-based assay for detecting ligand binding to microRNA precursors.
  • To assess the utility of this assay in screening potential drug candidates that interact with pre-miRs.
  • To validate the FRET assay against established biophysical techniques.

Main Methods:

  • Design of FRET-labeled oligoribonucleotides for the precursor of miR-21 (pre-miR-21).
  • Development of an interbase-FRET assay to monitor structural changes upon ligand binding.
  • Application of the FRET assay for qualitative screening of aminoglycoside antibiotics binding to pre-miR-21.
  • Validation using Surface Plasmon Resonance (SPR) and Isothermal Titration Calorimetry (ITC).

Main Results:

  • The interbase-FRET assay accurately detects structural alterations in pre-miR-21 induced by small molecule binding.
  • The assay successfully performed a qualitative screen of 12 aminoglycoside antibiotics for binding affinity to pre-miR-21.
  • The FRET assay demonstrated comparable accuracy to SPR and ITC but offers advantages in sensitivity, sample size, and throughput potential.

Conclusions:

  • The developed solution-based FRET assay is a sensitive and efficient method for studying pre-miRNA-target interactions.
  • This assay facilitates rapid drug candidate screening and can be expanded for high-throughput applications.
  • The method holds promise for advancing research in microRNA-targeted therapies and understanding disease mechanisms.