D-Threonine

D-Threonine is the D-stereoisomer of the proteinogenic amino acid threonine, featuring a chiral α-carbon bearing a primary amino group and a carboxylic acid, with a side chain containing a β-hydroxyl functional group. The molecule's stereochemistry dictates its compatibility with stereoselective peptide coupling and enzyme recognition, while the amino and carboxyl groups enable formation of amides and salts under controlled pH. The β-hydroxyl can participate in derivatization and protection strategies such as esterification or ether formation, supporting downstream conversion to protected amino acid building blocks. As a chiral amino acid, D-Threonine functions as a stereochemically defined intermediate for peptide chemistry, chiral synthesis, and biochemical research workflows requiring D-amino acid incorporation.

1. Peptide Synthesis

D-Threonine is applied in peptide synthesis workflows where stereodefined D-amino acid residues are required to tune backbone conformation and protease stability profiles. The amino acid's free α-amino and α-carboxyl functionalities support standard coupling chemistries after conversion to N-protected and/or activated forms, while the β-hydroxyl side chain can be protected to prevent competing reactions during chain assembly. D-Threonine's D-configuration enables incorporation into peptide building blocks and peptidomimetic scaffolds for fragment coupling, solid-phase synthesis, or solution-phase assembly of stereochemically controlled analogs. The resulting D-threonine-containing peptides and peptide fragments can serve as downstream intermediates for structure-activity relationship studies and synthetic methodology development in amino acid chemistry.

2. Chiral Building Blocks

D-Threonine is utilized as a chiral starting material and chiral amino acid intermediate for stereoselective synthesis of functionalized derivatives and downstream chiral fragments. The molecule's defined D-stereocenter at the α-carbon, together with the β-hydroxyl group, supports selective functional group transformations such as side-chain protection, oxidation/reduction sequences, and conversion to esters or ethers for controlled reactivity. The carboxylic acid can be employed for activation to generate chiral acylating intermediates, while the amino group can be protected to direct chemoselective modifications at the side chain. D-Threonine-derived intermediates can feed into fine chemical synthesis and process chemistry routes where stereochemical integrity is required across multiple steps.

3. Chemical Biology Research

D-Threonine is suitable for chemical biology and biochemical research applications that require D-amino acid incorporation to modulate molecular recognition and enzymatic processing. The β-hydroxyl side chain provides a handle for constructing hydrogen-bonding patterns and for generating derivatized analogs used in binding studies, substrate analog design, or assay development. The amino acid's dual functional groups enable preparation of labeled or functionalized derivatives through N-functionalization and C-terminal activation, supporting studies of peptide recognition motifs and stereochemical effects. D-Threonine-containing conjugates and analogs can be used as research intermediates to generate stereochemically defined probes and to support mechanistic investigations in peptide science.

4. Bioconjugation Chemistry

D-Threonine is employed in bioconjugation and biomolecule modification strategies where amino acid-derived linkers and stereodefined attachment points are needed. The α-amino and α-carboxyl groups can be transformed into amide-forming components or activated ester intermediates, while the β-hydroxyl group can be protected or selectively functionalized to control conjugation site chemistry. D-configuration can be leveraged to reduce unwanted enzymatic cleavage or to maintain structural features in conjugated biomolecular constructs such as peptide-based linkers and modified ligands. D-Threonine-derived conjugation building blocks can support downstream preparation of labeled peptides, carrier-linked constructs, and analytical standards used in applied biochemical research.

5. Pharmaceutical Intermediate Preparation

D-Threonine is applied as an amino acid-based intermediate in pharmaceutical manufacturing-oriented synthesis, particularly for generating D-amino acid building blocks and stereochemically defined peptidomimetic precursors. The presence of a hydroxyl-bearing side chain enables controlled protection-group strategies that allow selective peptide coupling while preserving side-chain functionality for later elaboration. The amino acid's chiral center supports consistent stereochemical outcomes across multi-step routes, and the functional group set can be used to prepare N-protected derivatives, activated esters, or acylating intermediates for incorporation into larger synthetic targets. D-Threonine-derived intermediates can therefore serve as inputs to fine chemical synthesis and process chemistry intermediate preparation where chiral amino acid integrity and manufacturable derivatization steps are required.

6. Analytical Research Standards

D-Threonine is suitable for analytical research and method development requiring stereochemically defined amino acid standards and calibration materials. The D-configuration and hydroxyl side chain provide distinguishable chromatographic and derivatization behavior relative to L-threonine, supporting chiral analysis and quantitation in peptide and amino acid workflows. The molecule can be converted into derivatized forms for detection methods that rely on functional group reactivity, including amino and hydroxyl-targeted labeling strategies. D-Threonine-based analytical standards can support quality control of peptide intermediates, monitoring of stereochemical composition, and characterization of D-amino acid incorporation in synthetic and biochemical studies.

1. Autoinhibition and phosphorylation-induced activation of phospholipase C-γ isozymes

2. Quantitative Analysis of Ligands Effects on Bioefficacy of Nanoemulsion encapsulating Depigmenting Active

3. Emu oil in combination with other active ingredients for treating skin imperfections

4. Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)

5. Effect of Probiotic Lactobacillus plantarum on Streptococcus mutans and Candida albicans Clinical Isolates from Children with Early Childhood Caries