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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
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Optimizing methods to recover absolute FRET efficiency from immobilized single molecules.

James J McCann1, Ucheor B Choi, Liqiang Zheng

  • 1Department of Pharmacology, Stony Brook University, Stony Brook, New York, USA.

Biophysical Journal
|August 5, 2010
PubMed
Summary

This study introduces methods to accurately measure fluorescence resonance energy transfer (FRET) efficiency. Normalization techniques, especially single-molecule photobleaching, improve FRET data consistency across experiments and instruments.

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Area of Science:

  • Biophysics
  • Spectroscopy
  • Molecular Biology

Background:

  • Fluorescence resonance energy transfer (FRET) measurements are sensitive to optical filters and fluorophore quantum yield.
  • Inconsistent FRET efficiencies across experiments hinder data comparison.
  • Accurate FRET efficiency recovery requires normalization for instrument and fluorophore variations.

Purpose of the Study:

  • To systematically investigate methods for recovering true FRET efficiency.
  • To assess the impact of normalization techniques on FRET data accuracy and consistency.
  • To understand the influence of molecule-to-molecule variations on FRET distributions.

Main Methods:

  • Utilized DNA rulers with defined fluorophore separations to control FRET.
  • Varied optical elements to induce differences in observed FRET.
  • Tested protein samples with distinct quantum yields.
  • Applied and compared instrument transmission correction, empirical normalization, and single-molecule photobleaching normalization.

Main Results:

  • Instrument transmission correction partially reduced FRET deviations.
  • Empirical normalization proved effective but labor-intensive.
  • Single-molecule photobleaching normalization was the most effective method.
  • Per-molecule gamma-normalization narrowed FRET distributions by identifying outliers.

Conclusions:

  • Normalization is crucial for accurate and comparable FRET efficiency measurements.
  • Single-molecule photobleaching offers a robust approach for FRET data correction.
  • Molecule-to-molecule variations in gamma significantly impact FRET distribution analysis and require careful consideration.