A synthetic peptide that irreversibly inhibits activity of caspase-3 and related caspases and blocks apoptosis. The inhibitor is designed as a methyl ester to enhance cell permeability. The conjugation with biotin allows detection of activated caspases in conjunction with avidin-tags.
CAT No: HB00017
Biotin-DEVD-FMK is a synthetic, biotinylated peptide inhibitor specifically designed to target caspase-3 and related cysteine proteases. As a cell-permeable, irreversible inhibitor, it features the canonical DEVD peptide sequence recognized by caspase-3, conjugated to a fluoromethyl ketone (FMK) reactive group and a biotin moiety for affinity-based detection. This compound is widely utilized in apoptosis research and protease activity studies due to its ability to form covalent adducts with active caspase enzymes, thereby enabling both functional inhibition and subsequent biochemical analysis. Its dual functionality as both an inhibitor and a biotin tag provides a versatile tool for dissecting protease-mediated signaling pathways and for enriching or visualizing targeted proteins in complex biological samples.
Enzyme Activity Profiling: In protease research, biotinylated DEVD-FMK is commonly employed to selectively inhibit caspase-3 activity in cell lysates, tissue extracts, or live cell systems. By covalently binding to the active site cysteine of caspase-3, it effectively halts enzymatic function, allowing researchers to interrogate the specific contributions of caspase-3-mediated proteolysis during apoptosis and other cellular events. This targeted inhibition facilitates the delineation of caspase-dependent pathways and the identification of downstream substrates impacted by caspase activation.
Affinity-Based Protein Capture: The presence of the biotin tag enables robust affinity purification of caspase-3 and its complexes from biological samples. After treatment with the inhibitor, biotinylated protease-inhibitor complexes can be isolated using streptavidin- or avidin-coated matrices, such as beads or plates. This approach allows for the enrichment and subsequent analysis of active caspase-3, supporting downstream applications like Western blotting, mass spectrometry, or immunoprecipitation, and providing insight into enzyme activation states and interacting partners.
Apoptosis Pathway Analysis: Biotin-DEVD-FMK is a valuable tool for mapping apoptotic signaling cascades in cellular models. By irreversibly inhibiting caspase-3, it enables the study of caspase-dependent versus caspase-independent apoptotic mechanisms. Researchers can use it to dissect the sequence of molecular events during programmed cell death, assess caspase activation kinetics, and evaluate the effects of genetic or pharmacological modulators on apoptosis progression.
Fluorescent Detection and Imaging: The biotin moiety incorporated into the molecule facilitates sensitive detection of caspase-3 activity in situ via biotin-streptavidin-based labeling techniques. Following inhibitor binding, cells or tissue sections can be probed with fluorescently labeled streptavidin conjugates, allowing visualization of active caspase-3 distribution and localization through fluorescence microscopy or flow cytometry. This capability supports detailed spatial and temporal analysis of protease activation in diverse experimental systems.
Inhibitor Validation and Screening: Biotin-DEVD-FMK serves as a reference compound for validating new caspase-3 inhibitors or screening small-molecule libraries in vitro. Its well-characterized inhibitory mechanism and biotin tag provide a benchmark for assessing the potency and specificity of novel inhibitors. By comparing the effects of test compounds with those of the biotinylated inhibitor, researchers can efficiently evaluate candidate molecules for further development in apoptosis or protease-targeted research applications.
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