Bz-DL-Arg-AMC · HCl

Bz-DL-Arg-AMC · HCl is an arginine-derived fluorogenic amide in which the α-amino group is benzoylated (Bz) and the guanidinium side chain is present as a protonated salt with hydrochloride, while the C-terminus is linked to 7-amino-4-methylcoumarin (AMC) through an amide bond. The molecule therefore combines a chiral amino acid framework (DL mixture at the stereogenic center) with a strongly basic guanidinium functionality and a coumarin reporter that can participate in enzyme-triggered cleavage or chemical derivatization. The benzoyl protecting group modulates amide formation and peptide-coupling compatibility, whereas the AMC fluorophore enables sensitive monitoring of bond scission events under biochemical conditions. As a result, Bz-DL-Arg-AMC · HCl functions as a research-grade substrate/intermediate for studying arginine-recognizing processes and as a chiral amino acid derivative that can be carried into downstream synthetic work involving AMC-labeled motifs.

1. Fluorogenic Enzyme Assays

Bz-DL-Arg-AMC · HCl is applied in biochemical research for fluorogenic assays targeting proteases or peptidases with arginine specificity, where the AMC group serves as a measurable reporter upon cleavage of the Arg-AMC amide linkage. The benzoylated amino terminus and the guanidinium side chain create a substrate pattern that can be recognized by enzyme active sites requiring basic residues, while the HCl salt form ensures consistent protonation of the guanidinium during assay conditions. The DL stereochemistry can be used to probe stereochemical tolerance of enzyme recognition or to generate comparative substrate sets without committing to a single enantiomer. Downstream, assay readouts can guide inhibitor screening, substrate specificity mapping, and selection of arginine-mimetic labeling reagents for mechanistic studies in peptide chemistry and chemical biology.

2. Peptidase Specificity Profiling

Bz-DL-Arg-AMC · HCl supports structure-function investigations in peptide science by providing an arginine-containing fluorescent tag that reflects how side-chain basicity and N-terminal acylation influence substrate processing. The guanidinium functionality is a key recognition element for enzymes that preferentially bind positively charged residues, while the Bz group models an N-protected amino acid motif that can affect binding orientation and cleavage kinetics. The coumarin reporter enables rapid comparison across related amino acid derivatives, including positional isomers or alternative side-chain chemistries, to build specificity profiles for SAR studies. Resulting datasets can be translated into rational design of peptide analogs and inhibitor scaffolds that incorporate guanidinium-like interactions and AMC or related fluorophore handles.

3. Peptide Building Block Development

Bz-DL-Arg-AMC · HCl can be used in synthetic organic chemistry as an AMC-labeled arginine derivative for constructing peptide-like intermediates and testing coupling strategies for arginine-containing sequences. The molecule contains an amide-linked coumarin acceptor and a benzoyl-protected amino functionality, both of which can inform protecting-group planning when assembling longer peptide constructs or when generating libraries of AMC-tagged fragments. The protonated guanidinium group can be leveraged for selective deprotection and subsequent functionalization steps, enabling preparation of derivatives where the basic side chain is carried through coupling while maintaining orthogonality with other functional groups. Downstream utility includes preparing fluorescent peptide analogs for mechanistic studies, building chimeric substrates for enzyme assays, and generating reference standards for analytical method development in peptide chemistry.

4. Chemical Biology Labeling Probes

Bz-DL-Arg-AMC · HCl is suitable for chemical biology workflows that require arginine-recognizing fluorescent probes, where the AMC fluorophore enables detection of cleavage, binding, or release events associated with basic-residue recognition. The guanidinium group and N-benzoyl protection together define a recognizable chemical pattern that can function as a probe handle for studying biomolecular interactions involving arginine-binding sites, including substrate recognition pockets and processing enzymes. The HCl salt form stabilizes the cationic side chain, supporting reproducible probe behavior when incorporated into experimental reagent panels. Subsequent derivatization can generate AMC-bearing conjugates or analogs with altered N-acylation and side-chain modifications, supporting downstream studies in biomolecule modification and molecular recognition.

5. Process Chemistry Intermediate Preparation

Bz-DL-Arg-AMC · HCl is relevant to process chemistry and fine chemical synthesis as an isolable, functionalized amino acid derivative that can be used to prepare fluorescent substrate families under controlled synthetic routes. The presence of a defined N-acyl group (benzoyl), a stable amide linkage to AMC, and a salt-form guanidinium center supports reproducible handling during intermediate preparation and downstream transformations aimed at generating related Arg-AMC analogs. DL stereochemistry can simplify manufacturing of racemic intermediate sets for method development, comparative screening, or assay reagent standardization when enantiopure material is not required. Broader industrial utility includes scalable production of fluorescent amino acid derivatives for analytical research, peptide assay supply chains, and specialty chemical production where coumarin reporter incorporation is a recurring motif.

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