H-D-Ala-AMC · TFA

H-D-Ala-AMC · TFA is a trifluoroacetate salt form of a D-alanine derived amino acid amide bearing the 7-amino-4-methylcoumarin (AMC) fluorophore at the C-terminus. The molecule combines a chiral D-alanine center with an amide linkage to the AMC reporting group, producing a compact, strongly fluorescent substrate scaffold that can be used to monitor proteolysis or peptidase-like bond cleavage under controlled conditions. The AMC moiety provides a conjugated aromatic system suitable for sensitive fluorescence readout, while the TFA counterion supports handling as a stable, isolable salt and can be removed under standard deprotection conditions when needed for downstream coupling. The presence of a single amino acid residue with a defined stereocenter makes H-D-Ala-AMC · TFA a stereochemically specified biochemical research intermediate and a practical building block for substrate and inhibitor design workflows.

1. Peptidase Activity Assays

H-D-Ala-AMC · TFA is used in biochemical research for fluorescence-based peptidase activity assays because the AMC group functions as a cleavable reporter attached through an amide bond to the D-alanine residue. The D-configuration at the alanine stereocenter enables stereochemical selectivity when evaluating enzyme preferences for D-amino acid substrates. The trifluoroacetate salt form supports reproducible preparation and can be compatible with assay workflows that require consistent substrate solubility and handling. Cleavage that releases or alters the AMC environment can be monitored by fluorescence, enabling quantitative characterization of enzyme kinetics and substrate specificity in amino acid chemistry and protease research. The defined small-molecule format also supports rapid screening of substrate variants and mechanistic studies involving peptide bond recognition.

2. Enzyme Inhibitor Screening

H-D-Ala-AMC · TFA serves as a substrate component in drug discovery and chemical biology programs focused on identifying inhibitors of proteases or peptidase-like enzymes that process D-alanine-containing motifs. The AMC fluorophore provides a direct readout of bond cleavage, while the D-alanine side chain offers a stereochemically constrained recognition element that can discriminate between stereochemical binding modes. The amide-linked coumarin reporter can be paired with inhibitor libraries in structure-activity relationship studies, where changes in fluorescence response reflect altered substrate turnover. The TFA counterion can be managed during formulation of reaction mixtures to maintain consistent ionic conditions for comparative screening. Downstream, the assay outputs can guide medicinal chemistry toward peptidomimetic scaffolds that preserve key stereochemical and hydrogen-bonding features of the D-alanine-AMC motif.

3. Peptidomimetic SAR Studies

H-D-Ala-AMC · TFA is applicable to SAR studies and molecular design efforts that use fluorogenic amino acid derivatives to map how stereochemistry and amide geometry influence enzyme recognition. The single-residue D-alanine structure provides a minimal chiral element that can be systematically modified by substituting alternative amino acid analogs or by extending the peptide-like chain around the AMC reporter. The coumarin chromophore enables convenient comparison of analogs that differ in side-chain electronics, steric bulk, or stereochemical configuration at the alpha carbon. Trifluoroacetate salt handling supports reproducible preparation of these SAR probes in fine chemical synthesis and research intermediate workflows. The resulting data can be translated into peptidomimetic design principles for constructing larger, more stable inhibitor or substrate analogs with controlled stereochemistry.

4. Protected Amino Acid Building Block Use

H-D-Ala-AMC · TFA can be employed as a chiral biochemical research intermediate in synthetic organic chemistry when a D-alanine/AMC motif is required as a downstream fragment for constructing larger peptide-like structures. The molecule already contains the amino acid backbone in an amide-connected form, and the stereocenter can be retained during further derivatization steps that target the AMC reporter or additional coupling handles introduced elsewhere. The trifluoroacetate counterion provides a practical salt form that can be deprotonated or exchanged as synthetic conditions demand, supporting integration into protected amino acid chemistry strategies. The amide linkage to the AMC fluorophore can be leveraged to build conjugates or multi-residue constructs where fluorescence reporting remains intact. This makes H-D-Ala-AMC · TFA relevant to peptide science workflows that require stereochemically defined, fluorescence-tagged amino acid fragments for iterative synthesis and analytical characterization.

5. Fluorescent Bioconjugation Probes

H-D-Ala-AMC · TFA is suitable for chemical biology and biomolecule modification research where coumarin-based fluorescence enables tracking of cleavage, labeling, or binding events involving amino acid-derived linkages. The D-alanine amide motif can act as a recognizable chemical handle for incorporation into probe designs that respond to enzymatic processing or chemical transformations, while the AMC reporter provides sensitive optical detection. The presence of a defined stereocenter supports probe sets that distinguish stereochemical recognition in enzyme-substrate interactions or in stereoselective binding assays. The TFA salt form can facilitate handling in aqueous or mixed solvent systems used for probe preparation and can be adjusted by counterion exchange when compatibility with biomolecule conditions is required. Downstream, fluorescence-tagged amino acid constructs derived from H-D-Ala-AMC · TFA can support analytical research, assay development, and mechanistic studies in peptide chemistry and applied biochemical research.

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