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Enzyme-coupled assays for proteases

B E Cathers1, J V Schloss

  • 1Department of Medicinal Chemistry, University of Kansas, Lawrence 66045, USA.

Analytical Biochemistry
|October 1, 1996
PubMed
Summary
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A novel spectrophotometric method allows protease activity assays without specialized substrates. This approach couples peptide hydrolysis to a redox dye, enabling detection of endo- and exoproteases through liberated amino acids.

Area of Science:

  • Biochemistry
  • Enzymology
  • Analytical Chemistry

Background:

  • Traditional protease assays often rely on specialized substrates like fluorogenic, chromogenic, or radiolabeled peptides.
  • These methods can be expensive, limited in scope, or require specific detection equipment.
  • A need exists for a versatile and accessible protease assay strategy.

Purpose of the Study:

  • To develop a general spectrophotometric strategy for assaying protease activity.
  • To enable protease detection without the need for specialized peptide substrates.
  • To provide a flexible method applicable to both endo- and exoproteases.

Main Methods:

  • Developed a method coupling proteolytic hydrolysis to a chromogenic redox dye reaction.
  • Utilized enzyme-catalyzed reactions to link peptide cleavage to dye color change.

Related Experiment Videos

  • Employed amino acid oxidase, oxygen, horseradish peroxidase, and a specific redox dye (2,2'-azino-bis-(3-ethyl-benzthiazoline-6-sulfonic acid)) for detection.

    • Main Results:

    • Successfully demonstrated a spectrophotometric assay for protease activity.
    • The method is adaptable for assaying carboxy peptidases, amino peptidases, and endoproteases.
    • Achieved sensitive detection of liberated amino acids via a coupled enzymatic reaction.

    Conclusions:

    • The developed strategy offers a general and cost-effective approach for protease activity determination.
    • This method eliminates the requirement for specialized peptide substrates, enhancing accessibility.
    • The technique provides a versatile tool for biochemical and enzymatic research involving proteases.