H-Cys(Bzl)-AMC

H-Cys(Bzl)-AMC is a cysteine-derived amino acid derivative in which the thiol-bearing side chain is protected as a benzyl thioether (Cys(Bzl)) and the amino acid is converted to an amide linked to 7-amino-4-methylcoumarin (AMC). The structure combines a chiral cysteine backbone with a thioether-protected sulfur, an amide linkage to the fluorogenic leaving group, and the coumarin chromophore that supports sensitive optical readout. The benzyl thioether provides stability under many peptide-coupling and derivatization conditions while enabling later thiol unmasking through hydrogenolysis or related deprotection strategies when required. The AMC moiety introduces a strong reporter handle that can be used to monitor protease activity, substrate turnover, or cleavage events in biochemical assays and mechanistic studies, while the amide functionality also supports downstream synthetic transformations as an intermediate.

1. Fluorogenic Protease Substrates

H-Cys(Bzl)-AMC is applied in chemical biology and enzyme mechanistic research as a fluorogenic substrate format, where the AMC group enables monitoring of cleavage-associated fluorescence changes. The cysteine-derived backbone and the benzyl-protected thioether help define the local recognition environment around a sulfur-containing residue, supporting substrate design for thiol-sensitive protease classes and cysteine-dependent catalytic mechanisms. The amide linkage to AMC can be engineered into assay-ready substrate constructs or used as a direct analytical reagent for monitoring reaction kinetics. Downstream use commonly includes generating substrate analog libraries for specificity mapping and developing structure-activity relationship studies around sulfur side-chain presentation in enzyme active sites.

2. Peptide Coupling Intermediate

H-Cys(Bzl)-AMC is suitable for peptide synthesis workflows that require a cysteine-containing building block with a protected side chain, because the Cys(Bzl) motif can withstand common coupling conditions prior to final deprotection. The presence of the AMC amide provides a defined C-terminal reporter functionality that can be incorporated into peptide sequences to create cleavage-detectable peptide conjugates. The sulfur protection strategy reduces side reactions such as thiol oxidation during assembly, while the chiral center supports stereochemically defined residue placement in the growing chain. Resulting downstream derivatives include AMC-tagged peptide substrates, peptide fragments for mechanistic probing, and research-grade intermediates that connect amino acid chemistry to peptide-coupling chemistry.

3. Thioether Deprotection Chemistry

H-Cys(Bzl)-AMC is used in synthetic organic chemistry and applied peptide chemistry where controlled unveiling of sulfur functionality is required, since the benzyl thioether can be converted to a free thiol under appropriate deprotection conditions. The thiol-unmasked product can then participate in disulfide formation, thiol-maleimide conjugation, or other sulfur-selective derivatizations that are central to cysteine chemistry. The AMC reporter remains attached through the amide, enabling tracking of conversion steps by fluorescence and supporting analytical verification of deprotection and subsequent conjugation. Downstream utility includes preparing thiol-bearing cysteine analogs for biomolecule modification, generating reactive intermediates for conjugation chemistry, and supporting process-relevant intermediate preparation for sulfur-functional fine chemicals.

4. Bioconjugation And Labeling

H-Cys(Bzl)-AMC is relevant to bioconjugation chemistry and biomolecule labeling strategies that rely on cysteine-side-chain reactivity, using the AMC fluorophore as a built-in detection tag. The protected thioether form can be handled during synthesis and purification steps with reduced oxidation risk, while deprotection enables cysteine-directed coupling to electrophilic partners such as activated alkenes or heterobifunctional linkers. The coumarin reporter supports fluorescence-based readouts of labeling efficiency and conjugate formation in chemical biology workflows. Downstream applications include generating labeled peptide or protein fragments for interaction studies, producing assay reagents for monitoring conjugation reactions, and creating fluorescent standards for analytical research.

5. Analytical Research Standards

H-Cys(Bzl)-AMC is employed in analytical research as a coumarin-based reference compound and substrate analog for fluorescence detection, where the AMC chromophore provides strong signal under appropriate excitation. The defined cysteine stereochemistry and the benzyl-protected sulfur contribute to reproducible chemical behavior across assay formats and analytical methods. The amide structure supports consistent hydrolysis or cleavage behavior depending on the assay design, enabling calibration of signal response and monitoring of reaction progress in method development. Downstream use includes serving as a reference material for validating detection systems, supporting method transfer in peptide cleavage assays, and enabling comparative studies of amino acid derivative reactivity in fluorescence-based quantitation.

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