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Related Experiment Videos

Fluorogenic label for biomolecular imaging.

Luke D Lavis1, Tzu-Yuan Chao, Ronald T Raines

  • 1Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.

ACS Chemical Biology
|December 14, 2006
PubMed
Summary
This summary is machine-generated.

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Researchers developed a novel "latent" fluorophore that remains non-fluorescent until activated by a specific chemical reaction. This allows for precise imaging of biological processes like endocytosis in live cells with high spatiotemporal resolution.

Area of Science:

  • Chemical Biology
  • Molecular Imaging
  • Cell Biology

Background:

  • Conventional small-molecule fluorophores exhibit constant fluorescence, limiting their utility in dynamic biological experiments.
  • This inherent fluorescence can mask subtle changes and obscure critical information during live-cell imaging.
  • A need exists for probes that can be activated on demand to reveal biological processes with greater clarity.

Purpose of the Study:

  • To develop a versatile

Main Methods:

  • Synthesis of a latent fluorophore based on a modified rhodamine derivative featuring a urea group and a "trimethyl lock".
  • Covalent conjugation of the esterase-reactive latent fluorophore to a cationic protein.
  • Time-lapse imaging of endocytosis in live human cells using the developed fluorogenic label.

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Main Results:

  • The synthesized latent fluorophore conjugate exhibited no fluorescence until exposed to esterase activity.
  • Enzymatic activation by esterases in endocytic vesicles and cytosol triggered fluorescence.
  • Enabled high-resolution, time-lapse imaging of the endocytosis process in live cells.

Conclusions:

  • The developed latent fluorophore provides a "fluorogenic" approach, overcoming limitations of traditional always-on fluorophores.
  • The modular design allows for the creation of diverse probes for various biochemical and cell biological applications.
  • Offers unprecedented spatiotemporal resolution for studying dynamic cellular events like endocytosis.