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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

Updated: Jun 30, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Oligo DNA-based quantum dot (QD) single-particle tracking for multicolor single-molecule imaging.

Shigeo Sakuragi1, Naoki Kato1, Tomoya Uchida1

  • 1Department of Electrical Engineering and Biosciences, School of Advanced Science and Engineering, Waseda University, Tokyo 162-0056, Japan.

Biophysics and Physicobiology
|June 29, 2026
PubMed
Summary

Researchers developed a DNA-based method for labeling biomolecules with quantum dots (QDs) for multicolor single-particle tracking (QD-SPT). This technique enables simultaneous tracking of different membrane molecules, advancing cell membrane dynamics research.

Keywords:
diffusionmembrane moleculemulticolor imagingquantum dotsingle-particle tracking

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Last Updated: Jun 30, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Production and Targeting of Monovalent Quantum Dots
10:16

Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified λ DNA at the Single Molecule Level
08:56

Visualizing the Interaction Between the Qdot-labeled Protein and Site-specifically Modified λ DNA at the Single Molecule Level

Published on: July 17, 2018

Area of Science:

  • Biophysics
  • Molecular Biology
  • Cell Biology

Background:

  • Quantum dot single-particle tracking (QD-SPT) is vital for studying membrane dynamics.
  • Existing methods for conjugating QDs to biomolecules limit multicolor QD-SPT applications.
  • Specific labeling is crucial for analyzing multiple membrane targets simultaneously.

Purpose of the Study:

  • To develop a novel DNA hybridization-based method for specific QD labeling.
  • To enable multicolor QD-SPT for simultaneous tracking of different membrane molecules.
  • To overcome limitations in current QD conjugation techniques.

Main Methods:

  • Developed a DNA hybridization strategy for QD conjugation to biomolecules.
  • Fused QDs with oligo DNA to label 1,2-dipalmitoyl-sn-glycero-3-phosphatidylethanolamine (DPPE) via complementary DNA.
  • Utilized polyA-polyT linkers for enhanced QD-DPPE fusion.
  • Achieved multicolor QD-SPT by using distinct oligo DNA pairs for DPPE and GABAA receptor (GABAAR).

Main Results:

  • The DNA-based QD labeling method provides specific and stable labeling suitable for SPT.
  • PolyA-polyT linkers improved QD fusion efficiency compared to random linkers.
  • Oligo DNA-based QD-SPT accurately reflected DPPE diffusion dynamics.
  • Successfully demonstrated multicolor QD-SPT distinguishing DPPE and GABAAR lateral diffusion in live cells.

Conclusions:

  • The DNA hybridization-based QD labeling method offers a versatile approach for specific biomolecular labeling.
  • This technique significantly enhances the capability of simultaneous multicolor QD-SPT.
  • It is expected to advance the study of living cell membrane dynamics by enabling precise tracking of multiple molecules.