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A method for rapid protease substrate evaluation and optimization.

Igor A Kozlov1, Peter C Melnyk, Chanfeng Zhao

  • 1Illumina, Inc., 9885 Towne Centre Drive, San Diego, CA 92121-1975, USA.

Combinatorial Chemistry & High Throughput Screening
|July 18, 2006
PubMed
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We developed a high throughput assay to measure protease activity. This assay streamlines protease substrate evaluation and optimization in functional proteomics research.

Area of Science:

  • Biochemistry
  • Proteomics
  • Assay Development

Background:

  • Protease activity is crucial in various biological processes.
  • Accurate measurement of protease activity is essential for drug discovery and functional proteomics.
  • Existing methods can be time-consuming or lack throughput.

Purpose of the Study:

  • To develop a novel, high-throughput assay for measuring protease activity in solution.
  • To enable efficient protease substrate evaluation and optimization for biological research.

Main Methods:

  • Peptide substrates labeled with biotin and a fluorescent tag at opposite termini were synthesized.
  • Protease cleavage separated the biotin-containing fragment from the fluorescent fragment.
  • Streptavidin beads removed biotinylated species, leaving cleaved fluorescent fragments in solution.

Related Experiment Videos

  • Fluorescence intensity was measured to quantify protease activity.

    • Main Results:

    • The assay demonstrated high throughput capability for protease activity measurement.
    • Fluorescence intensity directly correlated with protease activity levels.
    • The assay was successfully validated using six different proteases: trypsin, chymotrypsin, caspase-3, subtilisin-A, enterokinase, and tobacco etch virus protease.

    Conclusions:

    • The developed assay provides a robust and efficient method for quantifying protease activity.
    • This technology accelerates research in functional proteomics and protease substrate optimization.
    • The assay's versatility and validation across multiple proteases highlight its broad applicability.