Fitc-LEVD-FMK integrates the LEVD sequence, an FMK reactive group, and a FITC fluorophore. The construct supports visualization of protease binding and covalent modification. Researchers apply it to monitor enzyme activation, specificity, and inhibitor potency. Its fluorescent properties suit kinetic and imaging assays.
CAT No: HB00034
Fitc-LEVD-FMK is a synthetic peptide-based inhibitor featuring a fluoromethyl ketone (FMK) reactive group and an N-terminal fluorescein isothiocyanate (FITC) label. Designed as a specific caspase-4 inhibitor, it mimics the LEVD peptide recognition sequence, enabling selective, irreversible binding to the active site cysteine of target proteases. The conjugation of FITC provides a convenient fluorescent tag for direct detection and visualization in various biochemical assays. Widely utilized in apoptosis and inflammation research, this compound offers researchers a robust tool for dissecting caspase-dependent pathways and monitoring protease activity in complex biological systems.
Enzyme inhibition studies: As a potent, cell-permeable caspase-4 inhibitor, Fitc-LEVD-FMK is extensively employed in studies aiming to delineate the functional role of caspase-4 in programmed cell death and inflammatory signaling. Its FMK moiety covalently modifies the active site thiol of the enzyme, resulting in irreversible inactivation. Researchers use this property to selectively block caspase-4 activity in cell lysates, intact cells, or tissue extracts, thereby enabling precise analysis of downstream molecular events and the identification of caspase-4-dependent processes.
Apoptosis pathway analysis: The LEVD peptide sequence confers specificity for caspase-4, allowing Fitc-LEVD-FMK to serve as a valuable probe in apoptosis research. By inhibiting caspase-4, investigators can distinguish its contributions from those of other caspases, such as caspase-1 or caspase-3, within the broader context of cell death signaling. This selective inhibition facilitates mechanistic studies that unravel the interplay between different caspase family members, helping to clarify the molecular basis of apoptotic and pyroptotic responses in diverse cell types.
Fluorescence-based detection assays: The FITC label incorporated into the inhibitor enables direct visualization and quantification of caspase-4 activity in situ. Researchers routinely utilize this feature in fluorescence microscopy, flow cytometry, and plate-based assays to monitor the distribution and kinetics of active caspase-4 within live or fixed cells. The fluorescent signal provides a sensitive, real-time readout of enzyme inhibition, supporting high-content screening and multiplexed analysis in cell biology and drug discovery applications.
Protease selectivity profiling: Fitc-LEVD-FMK is also instrumental in characterizing the substrate specificity and selectivity of caspase-4 relative to other cysteine proteases. By comparing the inhibitory effects of the compound across different protease isoforms or engineered variants, scientists can map substrate recognition motifs and elucidate structural determinants of enzyme-inhibitor interactions. These insights contribute to the rational design of selective inhibitors and the development of targeted chemical probes for protease research.
Cell-based functional assays: In live cell experiments, the cell-permeable nature of the inhibitor allows for efficient delivery and intracellular targeting of caspase-4. Researchers exploit this property to investigate the physiological consequences of caspase-4 inhibition in various cellular models, including immune cells, epithelial cells, and neuronal cultures. By monitoring changes in cell viability, cytokine release, or morphological features, it is possible to correlate caspase-4 activity with specific functional outcomes, advancing the understanding of its roles in inflammation, immunity, and stress responses.
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