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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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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

Updated: Jun 28, 2025

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET
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Exploring GPCR conformational dynamics using single-molecule fluorescence.

Eugene Agyemang1, Alyssa N Gonneville2, Sriram Tiruvadi-Krishnan2

  • 1UT-ORNL Graduate School of Genome Science and Technology, The University of Tennessee, Knoxville, TN 37996, USA.

Methods (San Diego, Calif.)
|April 11, 2024
PubMed
Summary
This summary is machine-generated.

Single-molecule techniques now allow detailed study of G protein-coupled receptors (GPCRs) dynamics, overcoming cellular complexity. These methods complement structural biology tools for deeper insights into GPCR signaling.

Keywords:
Co-polymersFRETGPCR dynamicsNanodiscsSingle-moleculeTIRF microscopy

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Area of Science:

  • Structural Biology
  • Molecular Cell Biology
  • Biophysics

Background:

  • G protein-coupled receptors (GPCRs) are crucial membrane proteins mediating cellular responses to external stimuli.
  • Studying GPCR structural dynamics is challenging due to complex cellular environments and endogenous interference.
  • Conformational changes in GPCRs are essential for G-protein coupling and initiating signal transduction pathways.

Purpose of the Study:

  • To review state-of-the-art techniques for single-molecule studies of GPCRs.
  • To highlight advancements in expressing, purifying, and labeling GPCRs for single-molecule research.
  • To showcase applications of single-molecule microscopy in elucidating GPCR dynamics.

Main Methods:

  • Advanced cell-expression systems for GPCR production.
  • Sophisticated membrane-protein purification strategies.
  • Novel labeling approaches for single-molecule detection.
  • Single-molecule microscopy techniques (e.g., fluorescence microscopy).

Main Results:

  • Recent advances enable studying GPCR structural dynamics at the single-molecule level, both in vitro and in live cells.
  • Four illustrative studies demonstrate the power of single-molecule microscopy in revealing GPCR dynamics.
  • These single-molecule methods provide complementary data to established structural biology techniques.

Conclusions:

  • Single-molecule approaches offer unprecedented resolution for investigating GPCR conformational changes and dynamics.
  • These techniques are vital for understanding GPCR function in complex biological systems.
  • Single-molecule studies enhance and validate findings from cryo-electron microscopy and X-ray crystallography.