H-Asp-AMC is an amino acid derivative in which L-aspartic acid is linked to 7-amino-4-methylcoumarin (AMC) through an amide at the amino terminus, forming a conjugate that retains the aspartate side-chain carboxylic acid functionality. The molecule contains an aspartate α-amino and α-carboxyl framework (with the amino group acylated as part of the AMC conjugate), and it bears the AMC fluorophore whose aromatic system provides a labeling handle for fluorescence-based readouts. H-Asp-AMC is commonly used as a substrate analog in analytical and biochemical assays to monitor amide-bond cleavage or protease activity by tracking AMC-associated fluorescence changes, and it also serves as a chemically defined probe for structure-activity studies involving aspartate-containing recognition motifs.
H-Asp-AMC is an amino acid fluorogenic substrate composed of L-aspartic acid linked to 7-amino-4-methylcoumarin (AMC) through an amide/amide-adjacent tether, providing a chiral amino acid center and a coumarin reporter that can undergo enzyme- or reagent-triggered cleavage to generate a fluorescent AMC signal. The aspartate side chain presents a carboxylic acid functionality that can participate in hydrogen bonding and acid-base interactions, while the AMC moiety contributes a conjugated aromatic system suitable for sensitive optical readout. The molecule's compact, peptide-like topology makes it compatible with protease and peptidase assay formats, and its defined stereochemistry supports selective recognition by enzymes that discriminate Asp-containing substrates. H-Asp-AMC is commonly handled as a research-grade biochemical tool and synthetic intermediate for downstream derivatization into related AMC-tagged amino acid or peptide substrates.
1. Protease Activity Assays
H-Asp-AMC is used in biochemical screening and enzymology workflows to monitor protease or peptidase activity via cleavage of the AMC reporter, where the aspartate residue provides the recognition element for Asp-preferring catalytic sites. The molecule's aspartic acid side-chain carboxyl group and stereodefined backbone geometry can influence binding orientation in enzyme active sites, supporting substrate specificity studies. The AMC fluorophore enables optical quantification of reaction progress, allowing structure-function comparisons across Asp-containing substrate variants. H-Asp-AMC therefore functions as a practical amino acid-based fluorogenic probe in mechanistic studies and assay development for peptide bond-processing enzymes.
2. Peptidase Substrate Engineering
H-Asp-AMC is suitable for peptide substrate design efforts in which Asp-containing motifs are tuned to probe catalytic preferences, including side-chain positioning and local electrostatics near the scissile bond. The chiral aspartate center and the free carboxyl functionality (or its controlled ionization state under assay conditions) can be leveraged to map how enzyme recognition responds to stereochemical and functional-group changes. Coumarin-based AMC release provides a direct readout for comparative evaluation of modified amino acid derivatives, including N-/C-terminal substitutions or tether length adjustments. H-Asp-AMC supports iterative development of fluorogenic substrate libraries that are compatible with high-throughput biochemical characterization and enzyme panel screening.
3. Chemical Biology Probing
H-Asp-AMC can be employed in chemical biology research to interrogate enzyme classes that process Asp-containing peptide segments, using the fluorescent AMC output as a spatially and temporally trackable reporter in cell-free experimental systems. The amino acid-coumarin conjugate format mimics peptide recognition features while maintaining a defined stereochemical Asp configuration that enzymes can discriminate during binding. The presence of an acidic side chain enables targeted interaction patterns that can be exploited when designing related probes for pathway mapping or substrate profiling. H-Asp-AMC thus serves as an amino acid derivatization platform for generating fluorescence-based molecular probes tied to peptide-processing events.
4. Analytical Fluorogenic Standards
H-Asp-AMC is utilized as an analytical reference material and assay component in fluorescence-based quantification workflows, where the AMC reporter provides a measurable signal upon cleavage. The coumarin chromophore's conjugated structure supports sensitive detection, while the aspartate component anchors the substrate to Asp-recognition chemistries used in calibration and method verification. The defined molecular structure helps standardize substrate concentration and signal response in comparative experiments across different enzyme preparations or reaction conditions. H-Asp-AMC therefore functions as a biochemical research intermediate that can be extended into AMC-tagged analytical standards and related fluorogenic amino acid derivatives.
5. AMC-Tagged Intermediate Synthesis
H-Asp-AMC can be applied in synthetic organic chemistry as a chiral, peptide-like AMC-tagged intermediate for preparing broader sets of amino acid and peptide analogs bearing coumarin reporters. The molecule's functional group arrangement, featuring an amino acid core linked to a coumarin fluorophore, supports chemical transformations that modify the tether, protecting groups, or side-chain functionality to generate new substrate structures. The stereodefined Asp unit provides a handle for stereochemical studies and for constructing libraries of unnatural or modified amino acid derivatives that retain peptide coupling compatibility. H-Asp-AMC enables downstream fine chemical synthesis of AMC-labeled building blocks used in substrate mapping, enzyme profiling, and fluorescence-based assay reagent production.
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