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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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Related Experiment Video

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High Precision FRET at Single-molecule Level for Biomolecule Structure Determination
11:24

High Precision FRET at Single-molecule Level for Biomolecule Structure Determination

Published on: May 13, 2017

Accurate single-molecule FRET studies using multiparameter fluorescence detection.

Evangelos Sisamakis1, Alessandro Valeri, Stanislav Kalinin

  • 1Institut für Physikalische Chemie, Lehrstuhl für Molekulare Physikalische Chemie, Heinrich-Heine-Universität, Universitätsstrasse 1, Düsseldorf, Germany.

Methods in Enzymology
|July 15, 2010
PubMed
Summary
This summary is machine-generated.

Multiparameter fluorescence detection (MFD) enhances single-molecule Förster resonance energy transfer (smFRET) analysis by robustly assessing artifacts. This advanced technique enables precise identification and characterization of biomolecular conformations and dynamics.

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Last Updated: Jun 11, 2026

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11:24

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Published on: July 5, 2021

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Automated Two-dimensional Spatiotemporal Analysis of Mobile Single-molecule FRET Probes

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Area of Science:

  • Biophysics
  • Biochemistry
  • Spectroscopy

Background:

  • Single-molecule (sm) spectroscopy provides crucial insights into biological molecule function, challenging the view of static protein structures.
  • Förster resonance energy transfer (FRET) studies reveal that biomolecules adopt multiple conformations during function.
  • Interpreting smFRET data is challenging due to photophysical artifacts, dynamics, and contaminants.

Purpose of the Study:

  • To demonstrate how multiparameter fluorescence detection (MFD) overcomes limitations in smFRET data analysis.
  • To enable robust assessment of artifacts and accurate identification of molecular species.
  • To provide a comprehensive approach for analyzing biomolecular structure and dynamics.

Main Methods:

  • Simultaneous acquisition of multiple fluorescence parameters using MFD.
  • Detailed data analysis procedures and experimental considerations for MFD.
  • Development of a toolbox to account for fluorophore orientation, mobility, and position in FRET measurements.

Main Results:

  • MFD allows robust assessment and mitigation of artifacts in smFRET data.
  • Accurate identification and analysis of individual molecular species within a population.
  • Precise structure determination using FRET and consideration of fluorophore properties.
  • Kinetic studies resolving interconversion events between conformational subpopulations over a broad timescale.

Conclusions:

  • MFD offers superior capabilities for analyzing smFRET data, overcoming common challenges.
  • The technique facilitates accurate structural and dynamic characterization of proteins and nucleic acids.
  • MFD enables detailed investigation of biomolecular energy landscapes and conformational dynamics.