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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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Related Experiment Video

Updated: Jul 17, 2026

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

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

Published on: September 16, 2022

Light and electron microscopic localization of multiple proteins using quantum dots.

Thomas J Deerinck¹, Ben N G Giepmans, Benjamin L Smarr

¹Department of Neurosciences, The National Center for Microscopy and Imaging Research, University of California, San Diego, La Jolla, California, USA.

Methods in Molecular Biology (Clifton, N.J.)

|January 24, 2007

Summary

This study introduces quantum dots for pre-embedding immunolabeling, enabling simultaneous multi-protein labeling for light and electron microscopy. This novel method overcomes limitations of current techniques for ultrastructural protein identification.

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Last Updated: Jul 17, 2026

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

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Published on: September 16, 2022

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Multi-color Localization Microscopy of Single Membrane Proteins in Organelles of Live Mammalian Cells

Multi-color Localization Microscopy of Single Membrane Proteins in Organelles of Live Mammalian Cells

Published on: June 30, 2018

Area of Science:

Cell Biology
Microscopy
Biochemistry

Background:

Understanding cell structure and function relies on identifying proteins at the ultrastructural level.
Current methods for high-resolution in situ protein labeling and correlating light microscopy (LM) and electron microscopy (EM) observations have significant limitations.
These limitations include poor label penetration, challenges with simultaneous multi-protein labeling, and the necessity of using electron microscopy for efficacy evaluation.

Purpose of the Study:

To develop an improved method for pre-embedding immunolabeling of proteins for both LM and EM.
To overcome the limitations of existing techniques for high-resolution protein localization in cells.

Main Methods:

Utilized quantum dots for pre-embedding immunolabeling.
Applied the method for labeling multiple, diverse proteins simultaneously.
Enabled correlative light and electron microscopy analysis.

Main Results:

Demonstrated a novel approach using quantum dots for pre-embedding immunolabeling.
Successfully labeled multiple diverse proteins for both LM and EM.
Overcame common limitations associated with current protein labeling techniques.

Conclusions:

Quantum dot pre-embedding immunolabeling offers a versatile solution for multi-protein labeling.
This technique enhances the ability to correlate LM and EM observations for ultrastructural studies.
Provides a more efficient and effective method for protein identification in cell biology research.