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Microsphere-based protease assays and screening application for lethal factor and factor Xa.

Matthew J Saunders1, Heungbok Kim, Travis A Woods

  • 1National Flow Cytometry Resource, Biosciences Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.

Cytometry. Part a : the Journal of the International Society for Analytical Cytology
|April 11, 2006
PubMed
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A new microsphere-based assay system enables high-throughput screening of protease inhibitors. This adaptable method allows for multiplexable detection of inhibitors for various proteases, simplifying drug discovery.

Area of Science:

  • Biochemistry
  • Enzymology
  • Drug Discovery

Background:

  • Proteases are crucial in human biological pathways and bacterial toxins.
  • Current protease inhibitor development lacks standardized, universal methodologies.
  • Protease-specific assays limit broad application and efficiency.

Purpose of the Study:

  • To develop a novel, multiplexable microsphere-based assay for protease inhibitor screening.
  • To establish a versatile platform adaptable to various site-specific proteases.
  • To facilitate high-throughput screening (HTS) of protease inhibitors.

Main Methods:

  • Engineered recombinant fusion proteins with protease-cleavable sites.
  • Utilized a microsphere-based system with fluorescent reporters (GFP).

Related Experiment Videos

  • Employed flow cytometry (HyperCyt) for kinetic analysis and inhibitor detection.

    • Main Results:

    • Demonstrated specific cleavage of substrates for lethal factor and factor Xa proteases.
    • Optimized assay conditions for efficient protease activity and inhibition.
    • Achieved high-throughput detection of known protease inhibitors.

    Conclusions:

    • The developed assay is adaptable to any site-specific protease.
    • The system is compatible with high-throughput flow cytometry, enabling multiplexing.
    • This assay simplifies protease mechanism studies and HTS of inhibitors.