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A Colorimetric Assay that Specifically Measures Granzyme B Proteolytic Activity: Hydrolysis of Boc-Ala-Ala-Asp-S-Bzl
Published on: November 28, 2014
Identification and characterization of equine granzyme B
Konrad Piuko1, Ignacio G Bravo, Martin Müller
1Deutsches Krebsforschungszentrum, Forschungsschwerpunkt Angewandte Tumorvirologie, F035, Im Neuenheimer Feld 242, 69120 Heidelberg, Germany.
Veterinary Immunology and Immunopathology
|July 3, 2007
Summary
Researchers isolated and characterized a new enzyme, equine granzyme B (eqGrzmB). This functionally active protease is the first granzyme identified in horses, potentially aiding in equine lymphocyte research.
Area of Science:
- Immunology
- Biochemistry
- Protease research
Background:
- Granzyme B is a key enzyme in immune responses, crucial for lymphocyte-mediated cytotoxicity.
- The identification and characterization of granzymes across species advance our understanding of immune system evolution and function.
- Equine immune system research benefits from identifying species-specific immune molecules.
Purpose of the Study:
- To isolate and characterize a novel granzyme B homolog in horses.
- To confirm the functional activity and enzymatic properties of the identified equine granzyme B.
- To establish the phylogenetic relationship of equine granzyme B within the granzyme family.
Main Methods:
- Isolation and purification of the putative equine granzyme B (eqGrzmB).
- Sequence analysis to identify characteristic granzyme B features (e.g., signal peptide, activation di-peptide).
- Functional expression in human and insect cells, site-directed mutagenesis of active site residues, kinetic characterization, and phylogenetic analysis.
Main Results:
- Successful isolation and characterization of eqGrzmB, a novel granzyme B protease.
- Demonstration of functional enzymatic activity of eqGrzmB upon expression in heterologous systems.
- Identification of conserved active site residues essential for eqGrzmB activity and phylogenetic placement near other mammalian granzyme B enzymes.
Conclusions:
- The study successfully identified and characterized eqGrzmB, the first granzyme B identified in Equidae.
- The findings confirm eqGrzmB as a functionally active protease with conserved structural and catalytic features of granzyme B.
- The characterization of eqGrzmB provides a foundation for developing diagnostic tools for equine lymphocyte activity.
