PPACKII (trifluoroacetate salt) is a peptidyl electrophile blending aromatic, hydrophobic, and charged residues with a reactive functional group. Researchers apply it to study catalytic sites, covalent interactions, and conformational constraints. Its structural complexity supports advanced mechanistic and kinetic analyses. The TFA salt enhances solubility.
CAT No: R2405
CAS No:649748-23-2
Synonyms/Alias:PPACKII (trifluoroacetate salt);649748-23-2;PPACK II (diTFA);(2R)-2-amino-N-[(2S)-1-[[(3S)-1-chloro-6-(diaminomethylideneamino)-2-oxohexan-3-yl]amino]-1-oxo-3-phenylpropan-2-yl]-3-phenylpropanamide;2,2,2-trifluoroacetic acid;MFCD03788124;DA-66838;MS-31263;HY-122543;CS-0086593;H-D-Phe-Phe-Arg-chloromethylketone trifluoroacetate;(R)-2-Amino-N-((S)-1-(((S)-1-chloro-6-guanidino-2-oxohexan-3-yl)amino)-1-oxo-3-phenylpropan-2-yl)-3-phenylpropanamide bis(2,2,2-trifluoroacetate);
PPACKII (trifluoroacetate salt) is a synthetic peptide inhibitor widely recognized for its potent and selective action against serine proteases, particularly thrombin. As a structurally refined analog of PPACK, PPACKII incorporates modifications that enhance its stability and inhibitory profile, making it a valuable tool for biochemical and enzymological research. The compound's peptide backbone, combined with a trifluoroacetate counterion, ensures solubility and compatibility with a broad range of experimental systems. Its well-characterized mechanism of action and high specificity have established it as a standard reagent in studies focused on protease biology, coagulation mechanisms, and the regulation of enzymatic pathways.
Enzyme inhibition assays: In the context of enzymology, PPACKII serves as a reference inhibitor for dissecting the catalytic activity of thrombin and related serine proteases. By forming a covalent bond with the active site serine residue, it irreversibly blocks substrate access, allowing researchers to quantify enzyme kinetics, evaluate inhibitor potency, and establish baseline activity in complex mixtures. This application is fundamental for characterizing new enzyme variants, validating assay conditions, and benchmarking the efficacy of novel protease inhibitors.
Coagulation pathway research: The compound is extensively employed in studies of the coagulation cascade, where its ability to selectively inhibit thrombin provides a means to delineate the enzyme's precise role in fibrin formation and platelet activation. By halting thrombin-mediated processes, PPACKII enables the isolation and analysis of upstream and downstream signaling events, facilitating a deeper understanding of hemostatic regulation and the molecular basis of thrombosis. This approach is instrumental in unraveling the interplay between coagulation factors and cellular responses in both physiological and pathological settings.
Protease specificity profiling: Researchers utilize PPACKII to map the substrate specificity and inhibitor sensitivity of various serine proteases. Its defined inhibitory mechanism allows for comparative studies across protease families, supporting the identification of conserved motifs and divergent functional elements. These insights are critical for the rational design of selective inhibitors, substrate analogs, and diagnostic probes, contributing to advancements in protease-targeted research and drug discovery.
Structural biology studies: The peptide-based nature of PPACKII makes it an ideal candidate for co-crystallization with target enzymes, aiding in the elucidation of protease-inhibitor complex structures. Structural data obtained from such studies inform the understanding of active site architecture, inhibitor binding modes, and conformational dynamics. This information underpins efforts to optimize inhibitor scaffolds and to develop structure-guided strategies for modulating protease activity in vitro.
Analytical method development: In analytical biochemistry, PPACKII is employed as a tool to control proteolytic activity during sample preparation and assay development. Its rapid and irreversible inhibition of serine proteases prevents unwanted degradation of proteins and peptides, ensuring sample integrity for downstream analyses such as mass spectrometry, chromatography, and immunodetection. This application is particularly valuable when working with complex biological matrices, where endogenous protease activity can compromise experimental outcomes.
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