Fitc-YVAD-FMK incorporates a YVAD sequence with an FMK electrophile and FITC fluorescent label. The construct helps visualize protease engagement and assess enzymatic specificity. Researchers employ it in kinetic assays, imaging, and irreversible inhibition studies. Its fluorescent readout enables sensitive activity tracking.
CAT No: HB00046
Fitc-YVAD-FMK is a synthetic peptide-based caspase inhibitor conjugated to fluorescein isothiocyanate (FITC), designed for research applications in apoptosis and cell death pathways. As a cell-permeable, irreversible inhibitor targeting caspase-1 and related cysteine proteases, it combines the tetrapeptide sequence YVAD (tyrosine-valine-alanine-aspartic acid) with a fluoromethyl ketone (FMK) reactive group and a FITC fluorescent label. This unique structure enables both selective inhibition of caspase enzymatic activity and direct visualization or quantification in cellular assays, making it a highly specialized reagent for dissecting inflammatory and apoptotic processes at the molecular level.
Apoptosis research: Fitc-YVAD-FMK is widely utilized in studies investigating the molecular mechanisms of programmed cell death, particularly in the context of inflammasome activation and pyroptosis. By irreversibly binding to the active site of caspase-1, it effectively halts the proteolytic processing of key substrates such as pro-IL-1β and pro-IL-18. This allows researchers to dissect the role of caspase-1 in cytokine maturation and inflammatory signaling, providing critical insights into cell death pathways and the regulation of innate immunity.
Live cell imaging: The FITC label on the peptide enables direct visualization of caspase-1 activity in living cells using fluorescence microscopy or flow cytometry. When introduced into cell cultures or tissue samples, the probe selectively accumulates in cells with active caspase-1, emitting a green fluorescent signal upon excitation. This property facilitates real-time monitoring of inflammasome activation and apoptotic events, supporting dynamic studies of cellular responses to various stimuli or pharmacological agents.
Enzyme activity assays: Fitc-YVAD-FMK serves as a valuable tool for quantifying caspase-1 activity in cell lysates or intact cells. By covalently modifying the enzyme, the inhibitor allows for the assessment of caspase-1 levels through fluorescence-based detection methods. This quantitative approach is essential for evaluating the efficacy of experimental treatments, screening for caspase inhibitors, or characterizing the kinetics of inflammasome activation under different experimental conditions.
Inflammation studies: In the context of immunology and inflammation research, the compound is instrumental in delineating the contribution of caspase-1 to the processing of pro-inflammatory cytokines. By selectively inhibiting this protease, Fitc-YVAD-FMK enables researchers to distinguish between caspase-dependent and independent pathways in the maturation and secretion of IL-1β and IL-18. This specificity is valuable for unraveling the molecular underpinnings of inflammatory diseases, host defense mechanisms, and immune cell signaling networks.
Screening and validation: The fluorescent and inhibitory properties of the molecule make it suitable for high-throughput screening applications, where it can be employed to identify novel modulators of caspase-1 activity or to validate the selectivity of candidate compounds. Its compatibility with automated fluorescence-based platforms streamlines assay development, supporting the identification of small molecules, peptides, or biological agents that influence inflammasome function or apoptosis-related pathways.
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