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Detecting enzymatic activity in cells using fluorogenic substrates

R P Haugland1

  • 1Molecular Probes, Inc., Eugene, Oregon 97402, USA.

Biotechnic & Histochemistry : Official Publication of the Biological Stain Commission
|September 1, 1995
PubMed
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New fluorogenic substrates allow detection of enzyme activity within single cells and organelles. These novel substrates prevent product leakage and enable visualization of cellular enzymatic processes.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Imaging

Background:

  • Fluorogenic substrates are used to detect cellular enzymatic activity.
  • Detecting enzymatic activity within single cells or organelles is challenging due to product leakage.
  • Existing methods struggle with spatial localization of hydrolytic enzyme activity.

Purpose of the Study:

  • To develop novel fluorogenic substrates for precise detection of enzyme activity.
  • To overcome the limitation of product leakage from cells and organelles.
  • To enable visualization of enzyme activity at the site of action in live and fixed cells.

Main Methods:

  • Design and synthesis of novel fluorogenic substrates.
  • Strategies to trap fluorescent products within cellular compartments (membranes, organelles).

Related Experiment Videos

  • Development of substrates forming fluorescent precipitates at the site of enzymatic activity.
  • Application in detecting endogenous enzyme activity and in enzyme-amplified histochemistry.

    • Main Results:

    • Successfully developed substrates that prevent leakage of fluorescent products.
    • Demonstrated trapping of fluorescent products within cell membranes and organelles.
    • Introduced substrates that form localized, highly fluorescent precipitates.
    • Validated substrate utility for detecting endogenous enzymatic activity in cells.
    • Showcased applicability in live-cell imaging and histochemical staining.

    Conclusions:

    • Novel fluorogenic substrates offer improved sensitivity and localization for enzyme activity detection.
    • These substrates overcome previous limitations, enabling intracellular and organelle-specific analysis.
    • The developed methods are valuable tools for cellular and molecular research, including live-cell studies.