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Single Molecule Fluorescence Energy Transfer Study of Ribosome Protein Synthesis
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Tracking Native Tetrahymena Ribozyme Folding with Fluorescence.

Jeffrey P Potratz1,2, Rick Russell1

  • 1Department of Molecular Biosciences, University of Texas at Austin, Austin, Texas 78712, United States.

Biochemistry
|November 1, 2023
PubMed
Summary

A new fluorescence assay simplifies monitoring RNA folding, offering a safer and more efficient alternative to traditional radioactivity-based methods for studying ribozyme structures.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • RNA Biology

Background:

  • The folding of structured RNAs, such as the Tetrahymena group I intron ribozyme, is crucial for their function.
  • Traditional methods for monitoring RNA folding rely on radioactivity-based assays, which present safety and logistical challenges.
  • Existing assays involve cleavage of radiolabeled substrates and laborious gel electrophoresis for data analysis.

Purpose of the Study:

  • To develop a more efficient and accessible fluorescence-based assay for monitoring RNA native state formation.
  • To provide an alternative to radioactivity- and gel-based assays for studying ribozyme folding.
  • To enable institutions without radioactive material capabilities to study Tetrahymena ribozyme folding.

Main Methods:

  • A fluorescence-based assay was developed using a substrate labeled with 6-carboxyfluorescein (6FAM) and a black hole quencher (BHQ1).
  • Cleavage of the substrate leads to the release of the quencher, resulting in a significant increase in fluorescence signal (approx. 30-fold).
  • The new assay was compared side-by-side with the established radioactivity-based assay for monitoring Tetrahymena ribozyme folding.

Main Results:

  • The fluorescence assay demonstrated good agreement with the radioactivity-based assay in monitoring Tetrahymena ribozyme folding.
  • The assay showed increased uncertainty compared to the radioactivity-based method but offered greater ease and efficiency.
  • The workflow simplification and elimination of radioactive materials make this assay more accessible.

Conclusions:

  • The developed fluorescence assay provides a viable, efficient, and safer alternative for monitoring RNA native state formation.
  • This method facilitates the study of Tetrahymena ribozyme folding and is adaptable for other ribozymes.
  • The assay broadens the accessibility of RNA folding studies, particularly for institutions avoiding radioactive isotopes.