H-Ser(tBu)-AMC · HCl is a protected serine amino acid derivative in which the side-chain hydroxyl is tert-butyl protected (Ser(tBu)) and the molecule is conjugated to 7-amino-4-methylcoumarin (AMC) via an amide linkage, with the overall material present as a hydrochloride salt. The structure contains a free amino group (as indicated by the H- prefix), a carboxyl functionality masked as part of the amide/derivatized framework, and an AMC fluorophore that provides a chemically addressable leaving group for analytical readouts, while the tert-butyl ether protection controls side-chain reactivity during synthesis. In research workflows, this compound is used as a substrate-like fluorescent probe for monitoring serine-dependent protease or esterase activity in biochemical assays and for developing fluorogenic methods that track cleavage or release of the AMC reporter.
H-Ser(tBu)-AMC · HCl is a hydrochloride salt of an N-acetylated serine-derived fluorogenic substrate in which the serine side-chain hydroxyl is protected as a tert-butyl ether (Ser(tBu)), while the amino acid is linked to an AMC reporter moiety (7-amino-4-methylcoumarin). The molecule contains a chiral serine backbone with stereochemical integrity at the α-carbon, a secondary alcohol protected by a bulky tBu group, and an amide/acetyl functionality that tunes stability toward premature hydrolysis. The AMC chromophore enables sensitive monitoring of bond cleavage events after deprotection or enzymatic processing, and the HCl salt form improves handling by providing a defined protonation state for coupling and storage. This structure functions as a peptide chemistry-compatible amino acid derivative and as a biochemical research intermediate for preparing related protected serine substrates, mechanistic probes, and analytical standards.
1. Enzyme Substrate Screening
H-Ser(tBu)-AMC · HCl is applied in enzyme substrate screening workflows for proteases, peptidases, and related hydrolases where serine-derived recognition motifs are evaluated using the AMC fluorophore as a readout. The protected side-chain hydroxyl (Ser(tBu)) helps control undesired transesterification or side reactions during assay setup, while the AMC reporter provides a measurable signal upon cleavage or conversion to the corresponding fluorescent coumarin product. The hydrochloride salt form supports reproducible solubility and protonation behavior in aqueous assay buffers, which can be relevant when comparing substrate analogs. Downstream use includes generating substrate libraries for structure-activity relationship studies and producing reference materials for method development in biochemical research.
2. Peptide Coupling Building Block
H-Ser(tBu)-AMC · HCl is utilized as a serine-based peptide chemistry building block where the amino acid framework and protected side-chain hydroxyl support controlled coupling strategies to form amide-linked constructs. The Ser(tBu) protection pattern is compatible with standard peptide synthesis logic, enabling selective deprotection of the side-chain hydroxyl under conditions that preserve other functional groups needed for sequential assembly. The AMC handle can be retained or transformed depending on the intended labeling or analytical readout, making the compound useful for constructing peptide-like probes and reporter-tagged fragments. Industrially, the same structural features can be leveraged in fine chemical synthesis to prepare fluorogenic intermediates for process-compatible assay reagents and analytical consumables.
3. Protected Amino Acid Derivatization
H-Ser(tBu)-AMC · HCl serves as a protected amino acid derivative for side-chain functionalization studies where tert-butyl ether protection on serine modulates reactivity of the hydroxyl group. The presence of a defined chiral center and a stable amide/acetyl environment enables stereochemically consistent derivatization of serine-containing motifs, including conversion into alternative protected forms or incorporation into larger molecular scaffolds. The HCl salt state can facilitate handling during derivatization steps that require controlled amine protonation, supporting reproducible intermediate formation. Downstream value includes preparing analogs with altered side-chain chemistry for mechanistic investigations, binding studies, and comparative substrate profiling.
4. Chemical Biology Fluorogenic Probes
H-Ser(tBu)-AMC · HCl is used in chemical biology for constructing fluorogenic probes that translate specific bond cleavage or deprotection events into coumarin fluorescence. The AMC reporter provides a sensitive readout that can be applied to monitor enzymatic activity, reagent-driven transformations, or cleavage selectivity in complex reaction mixtures. The Ser(tBu) group provides a chemically distinct handle that can be removed or modified to tune probe activation pathways, enabling rational probe design that distinguishes between side-chain deprotection and backbone cleavage. The resulting probe derivatives can be further employed as analytical tools, mechanistic probes, and scaffold components for developing peptide-mimetic reporters.
5. Analytical Standard Development
H-Ser(tBu)-AMC · HCl is suitable for analytical research as a reference substrate or calibration component in fluorescence-based assays that quantify enzymatic turnover or reaction progress. The coupling of a protected serine unit with the AMC reporter creates a defined chemical species whose conversion to the fluorescent AMC product can be monitored with high sensitivity, supporting method validation and comparative quantification across substrate analogs. The hydrochloride salt form can improve batch-to-batch reproducibility in preparation of assay solutions by stabilizing protonation-dependent behavior. Downstream applications include preparing related standards for LC/fluorescence workflows, supporting quality control of peptide-derived reagents, and enabling consistent interpretation of substrate screening datasets.
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