Fitc-LLY-FMK combines LLY residues with an FMK warhead and a FITC dye for fluorescent tracking. The peptide probes hydrophobic pocket preferences and irreversible binding mechanisms. Researchers use it in live-labeling, enzyme profiling, and activity assays. Its structured motif supports detailed mechanistic studies.
CAT No: HB00037
Fitc-LLY-FMK is a synthetic peptide-based inhibitor that incorporates a fluorescein isothiocyanate (FITC) fluorophore for direct detection and an FMK (fluoromethyl ketone) moiety for irreversible enzyme inhibition. As a cell-permeable, fluorescence-labeled compound, it is specifically designed for the targeted inhibition and visualization of cysteine proteases, particularly those involved in apoptotic and inflammatory pathways. The unique combination of a peptide recognition sequence, a reactive FMK group, and a fluorescent label makes Fitc-LLY-FMK exceptionally valuable for mechanistic studies in biochemistry and cell biology, where real-time monitoring and selective enzyme targeting are required.
Enzyme activity profiling: Fitc-LLY-FMK is widely utilized in the profiling of cysteine protease activity within complex biological samples. By covalently binding to the active site of target proteases, this inhibitor enables researchers to selectively label and track enzyme activity in live cells or cell lysates. The attached FITC moiety provides a direct fluorescent readout, facilitating the quantification and localization of active enzymes via fluorescence microscopy, flow cytometry, or gel-based analysis. This capability supports detailed investigations into protease function under physiological and pathological conditions.
Apoptosis research: The compound is particularly valuable in studies of programmed cell death, where cysteine proteases such as caspases play central roles. By irreversibly inhibiting specific proteases, Fitc-LLY-FMK allows researchers to dissect the contribution of individual enzymes to apoptotic signaling cascades. The fluorescence tag further enables visualization of inhibitor binding within intact cells, supporting time-resolved studies of apoptosis induction, progression, and inhibition. Such applications are crucial for understanding cell fate decisions and the molecular mechanisms underlying tissue homeostasis and disease.
Protease inhibitor screening: As a functional probe, Fitc-LLY-FMK is employed in the development and validation of new protease inhibitors. Its ability to covalently label active-site cysteines in a sequence-specific manner allows for the assessment of competitive binding and inhibitor potency in biochemical assays. The fluorescent signature aids in high-throughput screening formats, where the displacement or reduction of labeling serves as a quantitative measure of candidate inhibitor efficacy. This approach accelerates the identification of novel modulators for therapeutic or research purposes.
Live-cell imaging: The FITC-conjugated nature of the peptide enables direct visualization of protease engagement and distribution within living cells. Researchers can monitor the subcellular localization, trafficking, and accumulation of active proteases in real time, providing insights into spatial regulation and compartmentalization of enzymatic activity. This feature is especially valuable in studies where dynamic changes in protease activity are linked to cellular responses to stimuli, stress, or pharmacological intervention.
Mechanistic pathway elucidation: Fitc-LLY-FMK supports the dissection of complex biochemical pathways involving cysteine proteases. By selectively inhibiting and visualizing enzyme targets, researchers can map protease-substrate relationships, identify downstream effectors, and clarify the sequence of molecular events in signal transduction networks. These mechanistic insights are foundational for advancing our understanding of cellular regulation, immune responses, and the molecular basis of disease processes.
1. C-Peptide replacement therapy and sensory nerve function in type 1 diabetic neuropathy
2. The spatiotemporal control of signalling and trafficking of the GLP-1R
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