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Related Experiment Videos

Imaging specific cell-surface proteolytic activity in single living cells.

John P Hobson1, Shihui Liu, Birgitte Rønø

  • 1Proteases and Tissue Remodeling Unit, National Institute of Dental and Craniofacial Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 30 Convent Drive, Bethesda, Maryland 20892, USA.

Nature Methods
|March 24, 2006
PubMed
Summary

Researchers developed a simple, noninvasive assay using engineered anthrax toxin fusion proteins to visualize cell-surface enzyme activity in living cells. This method allows for sensitive imaging of proteases like furin and metalloproteases, enabling high-throughput analysis.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Imaging

Background:

  • Proteolytic enzymes on the cell surface play critical roles in physiological and pathological processes.
  • Existing methods for detecting cell-surface proteolytic activity are often invasive or lack sensitivity.
  • Specific visualization of endogenous proteases like furin, urokinase plasminogen activator, and metalloproteases is challenging.

Purpose of the Study:

  • To develop a simple, sensitive, and noninvasive assay for visualizing cell-surface proteolytic activity in single living cells.
  • To enable specific imaging of endogenous furin, urokinase plasminogen activator, and metalloprotease activity.
  • To adapt the assay for various high-throughput analysis formats.

Main Methods:

  • Utilized nontoxic, reengineered anthrax toxin-beta-lactamase fusion proteins with altered protease cleavage specificity.

Related Experiment Videos

  • Developed a method to visualize specific cell-surface proteolytic activity in single living cells.
  • Adapted the assay for fluorescence microscopy, flow cytometry, and fluorescent plate reader formats.

    • Main Results:

    • Demonstrated a simple, sensitive, and noninvasive assay for detecting cell-surface proteolytic activity.
    • Successfully visualized endogenous furin, urokinase plasminogen activator, and metalloprotease activity in living cells.
    • Adapted the assay for multiple detection platforms, including microscopy and flow cytometry, suitable for automation.

    Conclusions:

    • The developed assay provides a powerful tool for studying cell-surface protease function in real-time.
    • The assay's noninvasive nature and adaptability for high-throughput analysis offer significant advantages for biological research and drug discovery.
    • This technology enables precise imaging of specific proteolytic activities, advancing our understanding of cellular processes.