Abstract
Activity-based probes (ABPs) are reactive small molecules that covalently bind to active enzymes. When tagged with a fluorophore, ABPs serve as powerful tools to investigate enzymatic activity across a wide variety of applications. In this article, detailed protocols are provided for using fluorescent ABPs to biochemically characterize the activity of proteases in vitro. Furthermore, descriptions are provided of how these probes can be applied to image protease activity in live animals and tissues along with subsequent analysis by histology, flow cytometry, and SDS-PAGE.
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