H-L-Lys-AMC*AcOH

H-L-Lys-AMC*AcOH is a lysine-based amino acid derivative featuring an L-lysine backbone linked to an AMC fluorophore (7-amino-4-methylcoumarin) and present as an acetate-form acid salt. The molecule contains the ε-amino side chain of lysine and the coumarin fluorophore that enables sensitive fluorescence readout, while the carboxylic acid functionality supports salt formation and can influence solubility and handling in aqueous assay media. The stereochemistry is fixed at the lysine α-center as L, which is relevant for enzyme recognition and for maintaining consistent spatial presentation of the side chain during biochemical studies. The AMC moiety and the amino acid scaffold together provide a compact, measurable probe that can undergo standard amino acid derivative transformations and can serve as a downstream intermediate for peptide-like constructs or labeled building blocks.

1. Enzyme Activity Probes

H-L-Lys-AMC*AcOH is used in biochemical research as a fluorescence-reporting substrate analog for lysine-targeting enzymes, where the AMC fluorophore provides a measurable signal upon cleavage or chemical transformation. The L-lysine stereochemistry and the ε-amino side chain geometry support recognition by protease or peptidase active sites that accommodate lysine residues, while the acetate-associated carboxylate improves compatibility with buffered aqueous systems. The coumarin-lysine linkage design enables incorporation into enzyme assay workflows as a defined, single-residue readout reagent for mechanistic studies. The resulting fluorescent product formation can be monitored to generate quantitative structure-function relationships for substrate specificity and inhibitor profiling in enzyme studies.

2. Peptide Coupling Building Block

H-L-Lys-AMC*AcOH functions as an amino acid derivative suitable for peptide synthesis planning when the AMC-labeled lysine is treated as a protected or derivatizable building block. The presence of an amino acid carboxyl group and an ε-amino functional handle enables coupling strategies that map onto standard amide-bond formation logic used for peptide construction, including route design that temporarily protects reactive sites to control chemoselectivity. The fixed L-configuration at the α-carbon supports stereochemically consistent incorporation into peptide-like sequences and can reduce ambiguity in downstream SAR studies. The AMC tag can then be retained as a fluorescent handle for monitoring peptide assembly, cleavage events, or fragment behavior in synthetic organic chemistry and chemical biology.

3. Chemical Biology Labeling

H-L-Lys-AMC*AcOH is applied in chemical biology workflows that require lysine-positioned fluorescent labeling to track biomolecular interactions or processing events. The lysine ε-amino group can participate in derivatization chemistries that form stable linkages to target biomolecules or to polymeric carriers, while the AMC fluorophore provides a built-in spectroscopic reporter. The acetate-form acid character helps tune ionic interactions and can support reproducible conjugation conditions by influencing local protonation states. The resulting labeled lysine-containing conjugates can be used to interrogate binding interfaces, monitor enzymatic transformations, and generate labeled standards for biomolecule modification studies.

4. Analytical Fluorescence Standards

H-L-Lys-AMC*AcOH serves as an analytical research reagent for fluorescence-based detection and calibration in assays that involve lysine recognition or coumarin readouts. The AMC moiety provides a direct optical signal, and the lysine scaffold defines the chemical identity of the substrate-like species, which improves interpretability when comparing reaction conditions or substrate variants. The defined stereochemistry and functional group pattern help maintain consistent fluorescence response across analytical runs, supporting method development for enzyme activity measurements and substrate screening. Downstream, the compound can be used to prepare reference materials or intermediate standards for analytical research and quality control of labeled amino acid derivatives.

5. Industrial Process Intermediate

H-L-Lys-AMC*AcOH can be employed in specialty chemical production as a process-relevant intermediate for manufacturing coumarin-labeled lysine derivatives and related fluorescent amino acid building blocks. The molecule's amino acid functional groups and AMC fluorophore enable scalable derivatization logic that aligns with industrial fine chemical synthesis, including salt formation for handling and subsequent protection/deprotection strategies to direct selective coupling. The L-lysine stereochemical integrity supports consistent downstream performance in enzyme assay reagents and labeled peptide fragments used in research-grade workflows. The acetate-associated acid form and the stable coumarin chromophore also support robust downstream conversion into other labeled intermediates for industrial chemical manufacturing.

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