Biotin-VDVAD-FMK presents a VDVAD motif coupled with FMK and a biotin tag. The peptide is widely used to identify proteases recognizing alternating hydrophobic and acidic residues. Researchers apply it to binding assays, inhibitor characterization, and protease enrichment. Its dual-functional architecture enhances assay precision.
CAT No: HB00050
Biotin-VDVAD-FMK is a synthetic peptide-based inhibitor designed for research applications in the study of caspase-2 activity and apoptotic signaling pathways. Structurally, it comprises a biotinylated pentapeptide sequence (Val-Asp-Val-Ala-Asp) conjugated to a fluoromethyl ketone (FMK) reactive group, which enables specific and irreversible binding to the active site cysteine of caspase-2. The biotin tag facilitates efficient affinity capture and detection, making this compound highly valuable for biochemical investigations that require both selective inhibition and robust downstream analysis. Its dual functionality as both an inhibitor and a molecular probe positions it as a versatile tool in cell death research and protease profiling.
Caspase-2 Activity Profiling: In apoptosis research, selective inhibition of caspase-2 is critical for dissecting its unique role among initiator caspases. The FMK moiety of Biotin-VDVAD-FMK forms a covalent bond with the catalytic cysteine residue of caspase-2, resulting in irreversible enzyme inactivation. Researchers utilize this property to specifically block caspase-2 activity in cell lysates or intact cells, enabling the functional analysis of caspase-2-dependent apoptotic events and the differentiation of its contributions from those of other caspases in programmed cell death.
Affinity-Based Proteomics: The biotinylated structure allows for efficient capture of active caspase-2 and covalently labeled complexes via streptavidin-based affinity purification. This facilitates downstream applications such as pull-down assays, Western blotting, and mass spectrometry-based proteomic profiling. By enriching for caspase-2 and its interacting partners, investigators can elucidate substrate specificity, identify novel binding proteins, and map proteolytic cleavage events within complex biological samples.
Apoptosis Pathway Elucidation: Selective inhibition using this peptide probe enables researchers to interrogate the upstream and downstream signaling pathways regulated by caspase-2. Through loss-of-function experiments, it becomes possible to clarify the involvement of caspase-2 in stress-induced apoptosis, DNA damage responses, and mitochondrial integrity. Such studies yield insights into the temporal sequence and molecular cross-talk between caspase-2 and other apoptotic mediators, advancing the mechanistic understanding of cell fate decisions.
Inhibitor Validation and Screening: The compound serves as a benchmark tool in validating the specificity and efficacy of novel caspase-2 inhibitors. Its well-characterized mechanism of action and irreversible binding profile make it an ideal positive control in inhibitor screening assays, supporting the development of new chemical probes and small molecules targeting apoptotic proteases. Researchers benefit from its use in comparative studies that assess inhibitory potency, selectivity, and off-target effects.
Cell-Based Assays: In cellular models, the application of Biotin-VDVAD-FMK enables real-time monitoring of caspase-2 activity and inhibition within living systems. By integrating the probe into cell culture experiments, investigators can assess the functional consequences of caspase-2 blockade on cell viability, apoptotic progression, and downstream signaling events. The biotin tag further allows for visualization and quantification of caspase-2 engagement through fluorescence microscopy or flow cytometry when coupled with appropriate detection reagents, thereby expanding the analytical capabilities for apoptosis research.
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