H-L-Arg-L-Arg-AMC*3HCl

H-L-Arg-L-Arg-AMC*3HCl is a bis-arginine peptide substrate in which the C-terminal residue is linked to 7-amino-4-methylcoumarin (AMC), forming an arginine-arginine recognition motif that is commonly used to monitor protease activity. The molecule contains two L-arginine side chains with guanidinium groups that remain strongly basic under typical peptide-coupling and assay conditions, and it bears an AMC fluorophore that enables sensitive readout upon enzymatic cleavage. The "*3HCl" designation indicates a tri-hydrochloride salt form, which improves handling of the cationic peptide substrate and supports reproducible solubility for aqueous assay buffers. The defined stereochemistry at both arginine residues and the amide linkage to the AMC reporter make the compound a structured, chiral peptide-derived reagent suitable for enzymology, peptide chemistry, and downstream analytical standardization.

1. Protease Activity Assays

H-L-Arg-L-Arg-AMC*3HCl is applied in enzymology and biochemical screening workflows to quantify protease or peptidase activity that recognizes dibasic Arg-Arg motifs. The two stereochemically defined L-arginine residues present guanidinium side chains that participate in substrate recognition and can drive selective cleavage by enzymes with arginine-preferring specificity. The AMC reporter acts as a fluorescence-generating leaving group upon bond scission, enabling kinetic monitoring and comparison across substrates or inhibitor sets. The tri-hydrochloride salt form supports consistent salt-mediated solvation of this highly cationic peptide substrate in aqueous buffers, supporting reproducible analytical readouts. The resulting data can be used to support structure-function studies of protease specificity and to guide inhibitor or substrate analog design in biochemical research.

2. Peptidomimetic And SAR Studies

H-L-Arg-L-Arg-AMC*3HCl is suitable for structure-activity relationship studies in medicinal chemistry and chemical biology where dibasic peptide recognition elements are evaluated in a controlled format. The Arg-Arg sequence provides a defined cationic recognition pattern, while the AMC conjugation creates a measurable surrogate for cleavage events without requiring full-length protein substrates. Side-chain guanidinium groups can be chemically modified in related derivatives to probe tolerance to charge density changes, stereochemical constraints, or steric effects around the scissile bond. The salt-stabilized, chiral peptide scaffold can also serve as a reference substrate for comparing analogs bearing alternative protecting-group strategies or reporter modifications. Downstream use includes generating structure-informed SAR datasets that connect amino acid stereochemistry and side-chain functionality to enzyme recognition behavior.

3. Analytical Research Standards

H-L-Arg-L-Arg-AMC*3HCl is utilized in analytical research as a fluorescence-based substrate standard for method development, assay calibration, and comparative protease profiling. The AMC fluorophore provides a direct spectroscopic handle, while the Arg-Arg motif constrains cleavage to enzymes that recognize dibasic residues, improving interpretability of assay signals. The defined L-configuration at both arginine centers supports consistent enzymatic processing relative to stereoisomeric or sequence-altered controls. The tri-hydrochloride salt form supports reliable dissolution and minimizes variability arising from protonation state changes of the guanidinium groups. The compound can therefore be employed to generate reference curves, validate assay linearity, and support routine quality checks in biochemical and industrial research laboratories.

4. Protease Inhibitor Screening

H-L-Arg-L-Arg-AMC*3HCl is applied in drug discovery and chemical biology screening to evaluate small-molecule or peptide-like inhibitors that modulate Arg-Arg-directed protease activity. The substrate's guanidinium-rich arginine side chains align with enzyme binding pockets that accommodate positively charged residues, enabling inhibition effects to be reflected as changes in AMC release. The peptide-to-fluorophore architecture allows inhibitor potency comparisons across series by monitoring fluorescence changes under controlled conditions. The chiral, sequence-defined nature of the substrate supports specificity discrimination when paired with related AMC substrates bearing different amino acid patterns. The resulting inhibition profiles can guide downstream synthesis of inhibitor analogs and inform mechanistic hypotheses about substrate recognition and catalytic-site engagement.

5. Peptide Chemistry Intermediate Utility

H-L-Arg-L-Arg-AMC*3HCl supports synthetic and process-oriented peptide chemistry workflows as a reporter-bearing amino acid derivative that can inform coupling strategy and protecting-group compatibility. The terminal AMC amide linkage and the two arginine residues provide a structural template for designing related protected amino acid building blocks, including routes that maintain guanidinium integrity during peptide assembly and subsequent AMC conjugation. The strong basicity of the arginine side chains makes salt-state control a practical consideration for purification and for planning deprotection or derivatization steps in analogous syntheses. The stereochemical definition at both residues provides a reference for stereopurity expectations when preparing sequence variants for screening or analytical method transfer. Downstream utility includes using this compound or its structural motifs to construct libraries of Arg-rich substrates and to standardize peptide coupling conditions in fine chemical synthesis and biochemical reagent manufacturing.

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