H-D-Met(O2)-OH

H-D-Met(O2)-OH is the deuterated, D-configured methionine sulfoxide amino acid, featuring a chiral α-carbon bearing a free carboxylic acid and a deuterium label while the thioether has been oxidized to a sulfoxide (Met(O2) motif). The sulfoxide functional group introduces a strongly polar S=O unit that can participate in hydrogen-bonding and can undergo stereochemically relevant redox and coordination behavior compared with the parent thioether. The presence of the intact amino acid backbone supports peptide coupling chemistry at the α-amine equivalent after appropriate activation or protection, while the D stereochemistry enables chiral discrimination in mechanistic and analytical workflows. As a stable isotope-labeled, stereodefined amino acid oxidation state, H-D-Met(O2)-OH functions as a chemically specific intermediate for amino acid derivatization, peptide building block preparation, and downstream labeling studies.

1. Isotope Labeling Studies

H-D-Met(O2)-OH is applied in biochemical research and analytical chemistry as a deuterated methionine sulfoxide standard for isotope-labeling experiments. The α-carboxylic acid and sulfoxide-bearing side chain provide chemically distinct sites for mass spectrometric detection and for monitoring oxidation-state-dependent transformations. D stereochemistry supports stereospecific tracking when studying stereochemical outcomes of enzymatic or chemical oxidation/reduction pathways, including workflows that distinguish D- versus L-derived sulfoxide species. The labeled sulfoxide can also be incorporated into peptide analogs or used to validate derivatization and quantitation strategies for Met(O) species, supporting accurate interpretation of oxidation dynamics and sample preparation effects in applied proteomics.

2. Peptide Synthesis Compatibility

H-D-Met(O2)-OH is suitable for peptide building block preparation in solid-phase or solution-phase peptide synthesis workflows targeting methionine sulfoxide-containing sequences. The amino acid backbone, with a free carboxyl group and a sulfoxide side chain, can be converted to protected or activated forms for coupling while preserving the oxidation state relevant to Met(O) chemistry. Deuterium labeling at the α-position can be retained through peptide assembly, enabling structurally faithful peptide analogs for mechanistic studies, stability assessments, and stereochemical tracing of backbone or side-chain transformations. Downstream conversion to N-protected derivatives and controlled activation of the carboxyl group can support incorporation into peptide scaffolds for structure-activity relationship studies and peptide science applications.

3. Chemical Biology Oxidation Probes

H-D-Met(O2)-OH is used in chemical biology as a defined methionine sulfoxide probe for investigating oxidation-linked processes and redox-sensitive recognition events. The sulfoxide group provides a polar, oxidation-state-specific functional handle that can participate in selective interactions and can serve as a reference point when comparing thioether versus sulfoxide behavior in biomolecule contexts. D stereochemistry enables discrimination in studies where stereochemical inversion or stereospecific reduction/oxidation outcomes matter for mechanistic interpretation. Labeled sulfoxide-containing peptides or conjugates derived from this amino acid can be employed to map oxidation patterns, validate analytical methods, and support mechanistic studies of Met(O) formation and turnover in complex reaction mixtures.

4. Analytical Method Development

H-D-Met(O2)-OH is applied for analytical research and method development as an LC-MS/MS or HRMS calibration and qualification reagent for methionine sulfoxide species. The deuterium label improves signal separation from endogenous or unlabeled Met(O) standards, while the sulfoxide functionality provides characteristic fragmentation and retention behavior distinct from methionine thioether analogs. The free carboxylic acid and defined stereochemistry support consistent derivatization chemistry when preparing standards for chromatographic workflows or for monitoring sample extraction efficiency. The compound can be used to benchmark quantitation of oxidation-state distributions in peptide or protein digests, supporting robust analytical interpretation in applied biochemical research and industrial quality control of labeled intermediates.

5. Specialty Chemical Production

H-D-Met(O2)-OH can serve as a stereodefined, isotope-labeled amino acid intermediate for fine chemical synthesis and specialty chemical production where oxidation-state control is required. The sulfoxide side chain introduces a functional group that can be carried through multi-step sequences as a stable oxidation-state motif, while the amino acid framework enables conversion into protected amino acid derivatives for downstream coupling chemistry. Deuterium incorporation supports tracer-grade manufacturing of labeled building blocks used in research-grade reference materials and labeled peptide reagents. The resulting derivatives can feed into broader amino acid derivatization pipelines, including preparation of labeled peptide fragments, chiral intermediates for synthetic methodology development, and oxidation-state-specific reagents used across applied chemical manufacturing.

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