Bz-Arg-AMC · HCl

Bz-Arg-AMC · HCl is an arginine-derived peptide substrate in which the α-amino acid side chain is present as the guanidinium functionality and the carboxyl terminus is capped as an amide linked to AMC (7-amino-4-methylcoumarin). The molecule is supplied as the hydrochloride salt, which protonates the basic arginine side chain and supports aqueous compatibility for biochemical assays and kinetic measurements. The benzoyl (Bz) group on the amino terminus provides an N-protection strategy that modulates reactivity during coupling or derivatization steps while maintaining the guanidinium group for enzyme recognition. The AMC fluorophore enables sensitive readout upon cleavage, making the compound a practical chiral amino acid derivative and analytical intermediate for peptide-processing studies and related synthetic chemistry workflows.

1. Enzyme Substrate Screening

Bz-Arg-AMC · HCl is applied in enzyme substrate screening for proteases and peptidases where arginine-specific recognition is required. The guanidinium side chain and the amide linkage to the AMC reporter create a substrate motif that can be cleaved to generate a measurable fluorescent signal. The N-benzoyl protection helps define the N-terminal environment, supporting consistent substrate behavior across assay formats that rely on controlled peptide-like recognition. Downstream use includes selecting substrate specificity panels, guiding inhibitor design campaigns, and preparing structurally related AMC-labeled amino acid derivatives for mechanistic studies in biochemical research and method development.

2. Protease Inhibitor Discovery

Bz-Arg-AMC · HCl functions as a mechanistic tool in protease inhibitor discovery by providing a defined arginine-containing cleavage substrate for competitive or mode-of-action evaluation. The hydrochloride salt form supports solubility and maintains protonation of the guanidinium group, which is often essential for binding in arginine-targeting active sites. The AMC reporter allows rapid readout of cleavage events, enabling translation of structure-function observations into inhibitor scaffold refinement. The benzoyl-protected amino terminus can also inform the design of N-protected peptidomimetic analogs and support synthesis of inhibitor precursors that mimic the substrate's terminal features.

3. Peptide Coupling Building Block

Bz-Arg-AMC · HCl can be used as a peptide-coupling compatible amino acid derivative in synthetic organic chemistry when AMC-bearing amide products are desired. The protected N-terminus (benzoyl) and the arginine side chain provide a protected amino acid framework that can participate in further derivatization while preserving the guanidinium functionality for subsequent recognition or conjugation chemistry. The amide linkage to the fluorogenic AMC moiety creates a stable handle for constructing larger peptide-like systems or for generating labeled fragments used in biochemical assays. Downstream synthetic utility includes preparing AMC-tagged arginine-containing fragments for peptide synthesis studies, fragment-based molecular modifications, and analytical reference materials used to validate coupling outcomes and cleavage specificity.

4. Chemical Biology Fluorogenic Probes

Bz-Arg-AMC · HCl is suitable for chemical biology as a fluorogenic probe supporting studies of proteolytic activity in complex reaction mixtures. The AMC fluorophore provides a direct optical readout tied to cleavage of the arginine-containing amide, while the guanidinium group provides the stereochemically defined side-chain functionality that enzymes recognize. The salt form (hydrochloride) supports handling under aqueous conditions and stabilizes the protonation state relevant to binding and catalysis. Broader downstream use includes generating probe libraries for specificity mapping, supporting assay standardization in research laboratories, and serving as a reference substrate during development of labeled amino acid and peptide analogs.

5. Analytical Research Standards

Bz-Arg-AMC · HCl serves as an analytical research standard for monitoring arginine-directed proteolysis and for calibrating fluorescence-based detection methods. The combination of a defined protected amino acid motif and the AMC reporter yields a reproducible substrate structure that can be used to benchmark assay conditions and interpret kinetic trends. The benzoyl group and hydrochloride salt form help maintain consistent chemical identity and protonation behavior across measurement workflows. Downstream applications include development of validated analytical reagents for peptide chemistry research, preparation of reference materials for method transfer, and preparation of derivative standards used to compare cleavage patterns among related amino acid and peptide substrates.

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