H-D-Ser(PO3H2)-OH

H-D-Ser(PO3H2)-OH is a deuterated, D-configured serine derivative bearing a phosphonic acid group at the side chain, presented as a free amino acid with an amino functionality and a terminal carboxylic acid. The molecule contains a stereogenic center at the serine carbon, and the phosphonate substituent provides a strongly acidic, metal-coordinating functionality that can exist in multiple protonation states under typical synthetic and analytical conditions. The combination of amino acid backbone reactivity with a phosphonic acid handle makes the compound a chemically distinct intermediate for amino acid derivatization, peptide-compatible coupling designs, and downstream formation of phosphorylated or phosphonate-bearing motifs. The deuterium labeling supports mechanistic studies and mass spectrometric discrimination of serine-phosphonate species in biochemical research and analytical workflows.

1. Peptide Synthesis

H-D-Ser(PO3H2)-OH supports peptide building workflows where a phosphonate-bearing serine analog is required, enabling incorporation of a phosphorylated side-chain mimic into peptide backbones. The amino acid framework provides a carboxylic acid and an amino group for coupling chemistry, while the phosphonic acid side chain can be selectively protected to manage chemoselectivity during peptide bond formation. Phosphonate protection strategies compatible with peptide synthesis can be applied to suppress side reactions and maintain stereochemical integrity at the D-serine center. The resulting protected amino acid derivative can be used for stepwise assembly of phosphoserine-like peptides and for generating peptide libraries used in phosphorylation-state mapping and recognition studies.

2. Chemical Biology

H-D-Ser(PO3H2)-OH is suitable for chemical biology investigations that probe kinase-like recognition, phospho-binding pockets, and substrate discrimination using a stable serine-phosphonate motif. The phosphonic acid group functions as a persistent anionic phosphate surrogate that can participate in hydrogen bonding and metal-assisted interactions, while the D-configuration can help distinguish stereochemical requirements in binding studies. The amino acid backbone enables controlled presentation of the side-chain functionality within peptide or small-molecule constructs, supporting structure-function analysis of phospho-dependent recognition. Downstream derivatization can generate labeled or conjugatable phosphonate analogs for monitoring binding events, mapping interaction networks, and refining molecular designs around phosphoserine mimicry.

3. Enzyme Studies

H-D-Ser(PO3H2)-OH can serve as an enzyme substrate analog or inhibitor lead component in studies focused on phosphotransfer, phosphatase-like activity, and phosphonate-sensitive catalytic mechanisms. The serine-derived stereocenter and the phosphonic acid functionality together define a stereoelectronic pattern that can be used to evaluate active-site tolerance for D-amino acid geometry and for phosphate-mimicking substituents. Deuterium labeling supports kinetic and mechanistic interpretation by enabling mass-based tracking of labeled intermediates or substrate-derived fragments in analytical readouts. The compound can be converted into protected intermediates for incorporation into longer peptide substrates or into assay-compatible derivatives used to interrogate catalytic specificity.

4. Analytical Research

H-D-Ser(PO3H2)-OH functions as a labeled analytical standard and reference material for LC-MS and MS/MS-based quantification of serine-phosphonate species and phosphorylation-state analogs. The combination of an amino acid backbone and a phosphonic acid group yields characteristic ionization behavior and fragmentation patterns that can be exploited for method development and calibration. The D-label provides mass separation from unlabeled serine-phosphonate standards, improving discrimination in complex biological matrices and enabling isotope-resolved quantitation. The compound can also be used to validate derivatization and sample preparation workflows targeting phosphoserine-like analytes and phosphonate-containing metabolites.

5. Pharmaceutical Manufacturing

H-D-Ser(PO3H2)-OH can be applied in process chemistry and pharmaceutical intermediate preparation where a phosphonate-bearing amino acid building block is needed for downstream synthesis of phosphorylated or phosphonate-containing drug-like scaffolds. The presence of a free carboxylic acid and amino functionality supports conversion into activated intermediates under controlled protection/deprotection schemes, while the phosphonic acid handle can be managed through temporary protection to ensure chemoselective coupling steps. D-stereochemistry can be retained through chiral synthesis routes or stereochemically controlled transformations, supporting manufacturing of stereodefined intermediates for SAR-focused programs. The compound's stable phosphonate motif can be carried forward into protected amino acid derivatives, peptide-like intermediates, or nonpeptidic phosphonate analogs used in fine chemical production and scale-up planning.

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