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Protein Dynamics in Living Cells

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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Visualizing Subcellular Localization of a Protein in the Heart Using Quantum Dots-Mediated Immuno-Labeling Followed by Transmission Electron Microscopy

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Tracking individual intracellular proteins using quantum dots.

Sébastien Courty, Maxime Dahan

Cold Spring Harbor Protocols

|November 5, 2013

Summary

This summary is machine-generated.

This study introduces a novel method for live-cell imaging using quantum dot (QD)-tagged proteins. The technique enables precise single-molecule detection within cells, aiding the study of intracellular biomolecule movement.

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Compact Quantum Dots for Single-molecule Imaging

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Compact Quantum Dots for Single-molecule Imaging

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Area of Science:

Cell biology
Biophysics
Nanotechnology

Background:

Single-molecule detection of intracellular proteins is crucial for understanding cellular processes.
Challenges include quantum dot (QD) delivery, intracellular fluorescence detection, and 3D motion tracking.

Purpose of the Study:

To develop a robust protocol for intracellular protein imaging using QDs.
To enable quantitative analysis of biomolecular motion in live cells.

Main Methods:

Coupling streptavidin-coated QDs (QD-SAVs) with biotinylated proteins in a hypertonic medium.
Loading QD-protein conjugates (QD-P) into live cells via osmotic lysis of pinocytic vesicles.
Utilizing hypotonic solutions to facilitate non-disruptive cell entry.

Main Results:

The osmotic lysis method ensures cell viability and avoids lysosomal enzyme release.
This technique is simpler and more reproducible than microinjection for simultaneous cell loading.
Successfully enables single-molecule detection of intracellular QD-tagged proteins.

Conclusions:

The developed protocol offers a simplified and effective approach for live-cell imaging of intracellular biomolecules.
This method enhances the understanding of complex biological processes like signal transduction and cell division.
Facilitates quantitative analysis of 3D molecular motion within the cytosol.