Z-AEVD-FMK

Z-AEVD-FMK is a synthetic peptide-based caspase inhibitor widely utilized in apoptosis research and cellular biology. Structurally, it is an N-benzyloxycarbonyl-protected tetrapeptide fluoromethyl ketone derivative, specifically designed to irreversibly inhibit caspase-10 and related caspase enzymes involved in programmed cell death. By mimicking the substrate recognition sequence of target caspases, this compound covalently modifies the active site cysteine residue, effectively blocking enzymatic activity. Its ability to selectively and potently inhibit key apoptotic proteases makes it a valuable tool for dissecting cell death pathways and elucidating the molecular mechanisms underlying apoptosis in various biological systems.

Apoptosis Research: Z-AEVD-FMK is extensively employed in studies aimed at understanding the molecular regulation of apoptosis. By irreversibly inhibiting caspase-10, as well as cross-reacting with other initiator and effector caspases, the inhibitor enables researchers to suppress apoptotic signaling in cultured cells, tissue extracts, or cell-free systems. This selective blockade allows for the delineation of caspase-dependent versus caspase-independent cell death processes, providing critical insights into the roles of specific caspases in both physiological and pathological contexts.

Mechanistic Enzyme Studies: In biochemical assays, the compound serves as a robust tool for characterizing the substrate specificity, catalytic mechanisms, and regulatory interactions of caspase family proteases. By utilizing Z-AEVD-FMK in in vitro or ex vivo enzyme activity assays, investigators can determine the kinetics of inhibition, assess the contribution of caspase-10 to proteolytic cascades, and validate the functional importance of individual caspases in complex protease networks. Such studies are essential for mapping apoptotic pathways and for the rational design of new inhibitors.

Cellular Pathway Dissection: The inhibitor is frequently used in cellular models to dissect the involvement of caspases in diverse signaling pathways beyond classical apoptosis, such as inflammation, differentiation, and immune responses. By selectively blocking caspase activity, researchers can distinguish between caspase-dependent and alternative signaling mechanisms, thereby clarifying the broader functional repertoire of these proteases in cell fate determination and intercellular communication.

Drug Discovery and Screening: Z-AEVD-FMK is a valuable reagent in high-throughput screening platforms aimed at identifying novel modulators of caspase activity. Its irreversible and specific inhibitory profile provides a reliable positive control for assay validation and benchmarking. Additionally, the compound is utilized to evaluate the efficacy and selectivity of new small-molecule inhibitors or peptide analogues, supporting the development of targeted modulators for research applications.

Proteomics and Biomarker Validation: In proteomic workflows, the use of this caspase inhibitor facilitates the stabilization of cellular protein profiles by preventing caspase-mediated degradation during sample preparation. This allows for the accurate quantification and identification of apoptosis-related protein substrates and cleavage fragments in mass spectrometry-based analyses. By preserving the integrity of proteomes, the inhibitor supports biomarker discovery efforts and enhances the reliability of downstream analytical results in apoptosis-focused research.

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