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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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Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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From Fast Fluorescence Imaging to Molecular Diffusion Law on Live Cell Membranes in a Commercial Microscope
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Single-Molecule Fluorescence Techniques for Membrane Protein Dynamics Analysis.

Ziyu Yang1, Haiqi Xu1, Jiayu Wang1

  • 1Beijing National Laboratory for Molecular Sciences, MOE Key Laboratory of Bioorganic Chemistry and Molecular Engineering, College of Chemistry and Molecular Engineering, 12465 Peking University, Beijing, China.

Applied Spectroscopy
|April 7, 2021
PubMed
Summary
This summary is machine-generated.

Fluorescence correlation spectroscopy (FCS) and single-molecule fluorescence resonance energy transfer (smFRET) reveal conformational dynamics of biological macromolecules. This review details their application to membrane protein analysis, covering methods and future directions.

Keywords:
FCSFluorescence correlation spectroscopydynamics analysismembrane proteinsingle-molecule fluorescence resonance energy transfersmFRET

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Area of Science:

  • Biophysics
  • Structural Biology
  • Biochemistry

Background:

  • Biological macromolecules, particularly membrane proteins, exhibit complex conformational dynamics and diversity.
  • Understanding these dynamics is crucial for elucidating protein function, especially for membrane receptors and transporters.
  • Trace amounts of analytes and the need for spatio-temporal resolution necessitate advanced analytical techniques.

Purpose of the Study:

  • To review fluorescence-based single-molecule techniques, specifically fluorescence correlation spectroscopy (FCS) and single-molecule fluorescence resonance energy transfer (smFRET).
  • To provide a comprehensive overview of applying these techniques to analyze membrane protein dynamics.
  • To discuss strategies for fluorophore selection, labeling, immobilization, instrumentation, and data processing for membrane protein studies.

Main Methods:

  • Introduction to the fundamental principles of FCS and smFRET.
  • Summary of labeling and immobilization strategies for membrane proteins.
  • Overview of confocal and total internal reflection fluorescence (TIRF) microscopy configurations and data processing methods.

Main Results:

  • Detailed discussion on selecting appropriate fluorophores, labeling sites, experimental setups, and analysis methods for membrane protein dynamics.
  • Demonstration of the utility of FCS and smFRET in resolving spatio-temporal heterogeneity in membrane protein behavior.
  • Highlighting the successful application of these techniques in studying membrane receptors and transport proteins.

Conclusions:

  • Fluorescence-based single-molecule techniques offer powerful tools for dissecting membrane protein conformational dynamics.
  • The review consolidates essential methodological aspects, aiding researchers in experimental design and data interpretation.
  • Identifies current challenges and outlines future research directions for advancing single-molecule analysis of membrane proteins.