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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
The substrate specificity profile of human granzyme A
Petra Van Damme1, Sebastian Maurer-Stroh, Han Hao
1Department of Medical Protein Research, Flanders Interuniversity Institute for Biotechnology, Ghent, Belgium. petra.vandamme@vib-ugent.be
Biological Chemistry
|June 12, 2010
Summary
Granzyme A, a protease, has its biological function debated. This study identified over 200 protein substrates, revealing its specificity for basic residues and advancing protease/substrate biology understanding.
Area of Science:
- Biochemistry
- Molecular Biology
- Immunology
Background:
- The biological role of granzyme A (a serine protease) remains unclear, with proposed functions in apoptosis and inflammation.
- Unlike granzyme B, granzyme A's physiological protein targets are largely uncharacterized.
Purpose of the Study:
- To extensively characterize the substrate specificity of human granzyme A.
- To identify macromolecular protein substrates and cleavage sites of granzyme A.
Main Methods:
- Utilized N-terminal peptide-centric proteomics technology.
- Analyzed over 200 unique protein substrates and identified more than 260 cleavage sites.
Main Results:
- Identified approximately 200 protein substrates for granzyme A, including known in vitro substrates like APEX-endonuclease 1 and histones.
- Determined that granzyme A predominantly cleaves after basic residues (P1 position).
- Delineated physical properties of substrate specificity profiles.
Conclusions:
- Provides a comprehensive map of granzyme A's protein substrates and cleavage preferences.
- Advances understanding of granzyme A's role in protease/substrate biology.
- Offers insights into the protease's function in cellular processes.
