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Related Experiment Video

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Production and Targeting of Monovalent Quantum Dots
10:16

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Multiplexed modular genetic targeting of quantum dots.

Saumya Saurabh1, Lauren E Beck, Suvrajit Maji

  • 1Department of Chemistry, ‡Molecular Biosensor and Imaging Center, §Department of Physics, ∥Lane Center for Computational Biology, and #Department of Biological Sciences, Carnegie Mellon University , Pittsburgh, Pennsylvania, United States.

ACS Nano
|November 9, 2014
PubMed
Summary

Researchers developed a new method for precisely targeting quantum dots (QDs) in living cells. This advance enables long-term tracking of multiple proteins, overcoming previous limitations in biological nanotechnology and imaging.

Keywords:
genetic targetingmembrane proteinquantum dotssingle-molecule imaging

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Area of Science:

  • Nanotechnology
  • Biotechnology
  • Molecular Imaging

Background:

  • DNA-directed nanotechnology is established for in vitro assembly.
  • Targeting nanomaterials in living systems for hybrid biological applications is challenging.
  • Current single-particle tracking in cells has trajectory limitations.

Purpose of the Study:

  • To develop a modular method for precise nanomaterial targeting in living biological systems.
  • To enable long-trajectory analysis of multiple proteins using quantum dots (QDs).
  • To overcome limitations in genetic targeting of QDs for advanced cellular imaging.

Main Methods:

  • Established a modular targeting approach using QD-streptavidin conjugates.
  • Precomplexed conjugates with biotinylated hapten molecules for selective binding.
  • Demonstrated labeling and single-particle tracking (SPT) of genetically encoded proteins.

Main Results:

  • Achieved high-speed labeling and SPT of multiple genetically encoded proteins on living cells.
  • Successfully labeled expressed proteins in the cytosol via microinjection.
  • Demonstrated labeling with three distinct QD conjugates, showing modularity.

Conclusions:

  • The developed method enables precise, directed targeting of nanoparticles in living systems.
  • This approach facilitates long-trajectory analysis of multiple proteins using QDs.
  • The modular strategy is extendable to other affinity interactions and nanoparticles.