Biotin-DQMD-FMK includes a DQMD motif coupled with FMK and a biotin moiety for avidin-based capture. The peptide is effective for isolating proteases involved in specific recognition pathways. Researchers use it to probe irreversible inhibition and cleavage-site profiling. Its design supports sensitive detection and interaction studies.
CAT No: HB00053
Biotin-DQMD-FMK is a synthetic peptide inhibitor featuring a biotinylated N-terminus and a fluoromethyl ketone (FMK) reactive group, designed for selective and irreversible inhibition of caspase-3 and related cysteine proteases. As a peptide-based tool compound, it integrates a DQMD tetrapeptide recognition sequence, mimicking natural cleavage sites of caspase-3 substrates, while the FMK moiety covalently modifies the active site cysteine, providing robust and specific enzyme inactivation. The biotin tag enables facile detection, enrichment, and downstream analysis, making Biotin-DQMD-FMK highly relevant in apoptosis research, protease profiling, and biochemical pathway elucidation.
Enzyme inhibition studies: In the context of apoptosis and programmed cell death research, Biotin-DQMD-FMK serves as a potent and selective irreversible inhibitor of caspase-3 and related caspases. By mimicking the natural substrate sequence, it binds specifically to the active site of the enzyme, while the FMK group forms a covalent bond with the catalytic cysteine residue. This mechanism enables detailed investigation of caspase activation, substrate specificity, and the functional consequences of enzyme inhibition in cell-free systems or lysates, supporting mechanistic studies of apoptotic signaling pathways.
Affinity-based proteomics: The biotinylated structure of this compound allows for efficient capture and isolation of active caspases from complex biological samples using streptavidin- or avidin-based affinity techniques. Researchers can use the biotin tag to selectively enrich covalently labeled proteases, facilitating downstream identification and quantification by mass spectrometry or immunoblotting. This application is particularly valuable for profiling active caspase populations, mapping protease activation states, and studying dynamic changes in protease activity under various experimental conditions.
Cellular apoptosis assays: Biotin-DQMD-FMK is widely employed in cell-based assays to monitor and modulate caspase activity during apoptotic processes. By irreversibly inhibiting caspase-3 within intact cells, it enables researchers to dissect the role of this protease in apoptotic progression, evaluate the efficacy of apoptosis-inducing agents, and distinguish caspase-dependent from caspase-independent cell death. The compound's cell permeability and selective reactivity make it a powerful tool for in situ functional studies of caspase regulation.
Substrate specificity analysis: The DQMD peptide sequence incorporated in the inhibitor is based on a canonical caspase-3 recognition motif, providing a platform for probing substrate preferences and catalytic efficiencies of caspase family members. By comparing the labeling efficiency and inhibitory potency of DQMD-FMK with variants containing alternative tetrapeptide sequences, researchers can systematically evaluate the substrate recognition profiles of different caspases, advancing the understanding of protease specificity and cross-reactivity.
Assay development and validation: The unique combination of biotin tagging and FMK-mediated irreversible inhibition makes this compound an ideal positive control or reference standard in the development and validation of caspase activity assays. It is frequently utilized in optimizing assay sensitivity, benchmarking new detection platforms, and validating the selectivity of novel caspase inhibitors. Its well-characterized biochemical behavior and robust performance contribute to assay reproducibility and reliability in both basic research and high-throughput screening environments.
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