H-D-Ser(SO3H)-OH

H-D-Ser(SO3H)-OH is the D-configured serine amino acid bearing a side-chain sulfonic acid group, presenting a zwitterionic, strongly polar motif with an amino acid backbone (primary amine and carboxylic acid) and a tethered sulfonate functionality. The D stereocenter at the alpha carbon enables stereochemically defined incorporation into peptide and peptidomimetic frameworks where epimeric control can affect conformational preferences and recognition. The sulfonic acid side chain remains highly ionized across a wide pH range and can participate in salt formation, hydrogen-bonding networks, and electrostatic interactions, while the carboxyl group supports coupling chemistry typical of amino acid building blocks. The compound's combination of an amino acid core and a stable, anionic side-chain handle makes it a practical chiral intermediate for protected amino acid synthesis and downstream functionalization strategies.

1. Peptide Synthesis

H-D-Ser(SO3H)-OH is applied in peptide coupling workflows as a stereodefined serine analog for assembling sulfonate-bearing peptide segments and peptide fragments. The D-amino acid backbone provides the canonical nucleophilic amine and carboxylic acid functionality needed for amide bond formation after appropriate protection and activation, while the side-chain SO3H group can be retained or orthogonally protected to control ionization during synthesis. Sulfonate-bearing residues can be introduced into peptide building block preparations to support electrostatic mimicry of phosphorylated or sulfated motifs without relying on labile phosphate chemistry. The resulting sulfonate-containing peptides and protected derivatives can be used for structure-activity relationship studies, peptide library construction, and biochemical probe generation within amino acid chemistry and peptide science.

2. Chemical Biology Probes

H-D-Ser(SO3H)-OH is used in chemical biology research to generate sulfonate-functional probes that emulate anionic post-translational modification patterns on peptide scaffolds. The side-chain sulfonic acid provides a persistent negative charge and strong hydrogen-bond acceptor character, enabling controlled electrostatic interactions in receptor-binding assays, protein interaction mapping, and binding-site characterization. D stereochemistry supports investigations that distinguish stereochemical determinants of molecular recognition, including epimer-specific binding behavior. Downstream derivatives prepared from this amino acid can be incorporated into labeled peptides, affinity tags, or fragment-based constructs to support mechanistic studies of electrostatic recognition in biomolecular systems.

3. Bioconjugation Chemistry

H-D-Ser(SO3H)-OH is suitable for bioconjugation-oriented intermediate preparation where a stable anionic side chain is needed to tune solubility, charge density, and conjugate behavior. The amino acid core can be converted into coupling-ready forms through N-protection and carboxyl activation strategies, while the sulfonic acid group can serve as a persistent handle for electrostatic steering and for maintaining water compatibility in conjugates. D stereochemical control can be leveraged to reduce enzymatic processing by stereospecific proteases or to probe stereochemical effects on conjugate stability and binding. Resulting sulfonate-containing linkers and amino acid derivatives can be employed in biomolecule labeling, affinity reagent synthesis, and conjugate libraries for applied biochemical research.

4. Peptidomimetics And SAR

H-D-Ser(SO3H)-OH is applied in peptidomimetic and structure-activity relationship (SAR) studies to construct analogs that preserve anionic character while varying stereochemistry and backbone context. The serine-derived side-chain architecture positions the sulfonate group at a defined distance from the peptide backbone, enabling rational design of charge placement and local electrostatics in receptor- or enzyme-binding models. D configuration at the alpha carbon supports stereochemical scanning and can help differentiate contributions from backbone stereochemistry versus side-chain charge effects. Downstream synthetic utility includes preparing protected sulfonate-bearing amino acid derivatives for iterative scaffold assembly and for generating analog panels used in SAR mapping and molecular design workflows.

5. Process Chemistry Intermediate

H-D-Ser(SO3H)-OH is relevant to process chemistry and fine chemical synthesis as a chiral amino acid intermediate for manufacturing sulfonate-bearing building blocks and downstream protected derivatives. The compound's strongly acidic sulfonic acid and carboxylic acid groups can be managed through protection-group selection and salt-state control during industrial route design, supporting reproducible handling in multistep syntheses. The D stereocenter provides stereochemical integrity for chiral intermediate supply chains where epimer contamination can propagate into final peptide or peptidomimetic products. Prepared intermediates derived from this amino acid can feed into peptide building block preparation, sulfonate-functional linker manufacture, and specialty chemical production requiring durable anionic functionality.

6. Analytical Standards

H-D-Ser(SO3H)-OH is utilized in analytical research as a stereochemically defined reference material for characterizing sulfonate-containing amino acid derivatives and peptide fragments. The combination of an amino acid backbone and a side-chain sulfonic acid enables distinct chromatographic and mass spectrometric signatures, supporting method development for quantitation, identity confirmation, and impurity profiling of sulfonate-bearing species. D stereochemistry allows separation of epimeric forms when analytical conditions resolve chiral centers, improving interpretation of synthetic outcomes and degradation pathways. Downstream use includes serving as a calibration component or structural standard in analytical workflows that monitor protected amino acid synthesis, peptide coupling products, and post-synthetic modifications involving anionic side chains.

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