Fitc-FA-FMK integrates a phenylalanine-alanine motif with a fluoromethyl ketone warhead and FITC tag. The construct helps examine substrate preferences of proteases that favor small hydrophobic residues. Researchers use it in fluorescence-based binding and inhibition assays. Its defined composition supports precise biochemical studies.
CAT No: HB00031
Fitc-FA-FMK is a synthetic peptide-based inhibitor that incorporates a fluorescein isothiocyanate (FITC) fluorescent tag, an amino acid sequence, and a fluoromethyl ketone (FMK) reactive group. As a cell-permeable, irreversible inhibitor, it is designed to covalently modify the active site cysteine residues of specific proteases, particularly those in the caspase family. The inclusion of the FITC moiety enables direct visualization and tracking in cellular and biochemical assays, making this compound an essential tool for researchers investigating protease activity, apoptosis pathways, and related cellular processes.
Protease inhibition studies: Fitc-FA-FMK is widely employed in the analysis of cysteine protease activity, especially caspases, which play central roles in programmed cell death and inflammation. By binding irreversibly to the catalytic cysteine within target enzymes, the compound allows for precise inhibition and functional dissection of protease-mediated pathways in vitro and in cellular systems. This capability is particularly valuable for elucidating the molecular mechanisms underlying apoptosis and for validating potential drug targets in cell signaling research.
Apoptosis detection and monitoring: The fluorescent FITC label on Fitc-FA-FMK enables researchers to directly visualize the localization and engagement of the inhibitor within living cells. When used in apoptosis assays, the compound serves as a sensitive probe for detecting active caspases, as its fluorescence accumulates in cells undergoing programmed cell death. This property facilitates both qualitative and quantitative assessment of apoptotic processes using techniques such as flow cytometry, fluorescence microscopy, and high-content imaging, supporting studies in cell biology and toxicology.
Enzyme labeling and target identification: The covalent binding mechanism of Fitc-FA-FMK makes it a valuable reagent for labeling active proteases within complex biological samples. After treatment, labeled enzymes can be isolated and identified using fluorescence-based detection methods, enabling researchers to profile protease activity patterns, discover novel enzyme targets, and investigate proteomic responses to various stimuli. This application is particularly relevant in biomarker discovery and the characterization of signaling networks.
Cell-based assay development: The unique combination of peptide specificity, irreversible inhibition, and fluorescent tagging allows Fitc-FA-FMK to be integrated into a variety of cell-based assays. Researchers utilize it to monitor dynamic changes in protease activity in real time, assess cellular responses to experimental treatments, and screen for modulators of apoptotic or inflammatory pathways. Its compatibility with live-cell imaging and flow cytometry platforms makes it a versatile component in high-throughput screening and mechanistic studies.
Biochemical pathway elucidation: By selectively inhibiting specific cysteine proteases and enabling their visualization, Fitc-FA-FMK supports detailed investigations into the roles of these enzymes within broader biochemical pathways. Researchers can use the compound to dissect the sequence of proteolytic events during cellular stress, differentiation, or immune activation. The ability to correlate protease activity with downstream molecular and phenotypic changes enhances understanding of complex biological systems and provides valuable insights for both basic and translational research.
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