Fmoc-Tyr(PO3(MDPSE)2)-OH

Fmoc-Tyr(PO3(MDPSE)2)-OH is an Fmoc-protected tyrosine derivative bearing a side-chain phosphate motif, where the phenolic oxygen is converted to a phosphonate/phosphate-protected functionality using an MDPSE-type protecting strategy. The molecule retains the chiral amino acid stereocenter and presents a protected α-amino group (Fmoc carbamate) and a carboxylic acid for peptide coupling, while the side-chain bears a highly polar, anionic-mimicking phosphorylated group that can be selectively unmasked or transformed under controlled deprotection conditions. The presence of the bulky, stereochemically defined phosphate protecting group supports compatibility with peptide synthesis conditions by reducing premature side reactions of the phosphate functionality. The overall structure functions as a chiral, protected amino acid building block for installing tyrosine-phosphorylation analogs into peptides and peptide-like scaffolds for downstream biochemical and synthetic chemistry workflows.

1. Phosphotyrosine Peptide Synthesis

Fmoc-Tyr(PO3(MDPSE)2)-OH is used in phosphotyrosine-targeting peptide synthesis where the Fmoc carbamate enables standard N-protected amino acid coupling at the α-position. The carboxylic acid and protected amino group allow incorporation into peptide chains using peptide coupling chemistry, while the tyrosine side-chain phosphate protecting group helps maintain phosphate integrity during assembly. The phosphorylated phenolic side chain is positioned to generate phosphorylation-mimetic or phosphorylation-releasing peptide analogs after controlled deprotection, supporting studies of kinase recognition motifs and phospho-dependent binding. The resulting peptides can be further processed into longer constructs or used as intermediate materials for generating libraries of site-specific phosphotyrosine-containing sequences.

2. Chemical Biology Phosphomimetic Probes

Fmoc-Tyr(PO3(MDPSE)2)-OH supports chemical biology research focused on phosphotyrosine recognition, because the side-chain phosphate functionality provides a strong hydrogen-bonding and electrostatic interaction pattern characteristic of phosphorylated tyrosine. The protected phosphate form helps stabilize the polar group during peptide assembly, while the retained tyrosine aromatic ring supports aromatic stacking and hydrophobic contacts in molecular recognition contexts. Following deprotection or functional conversion, the installed phosphate can serve as a handle for probing protein-peptide interactions, mapping binding determinants, and generating phosphorylation-state-dependent analogs. Downstream use includes preparing peptide probes for biochemical assays, affinity capture reagents, and mechanistic studies of phospho-regulated signaling interfaces.

3. Bioconjugation And Surface Labeling

Fmoc-Tyr(PO3(MDPSE)2)-OH is applicable to bioconjugation workflows where peptide conjugates require a defined phosphorylated tyrosine motif for selective binding or controlled electrostatics. The amino acid backbone enables peptide-based linker construction, and the side-chain phosphate can be unmasked to provide a reactive anionic group for subsequent coupling strategies or for tuning conjugate charge density. The MDPSE-type protection strategy is particularly relevant when conjugation steps involve conditions that might otherwise promote phosphate degradation or uncontrolled side reactions. The resulting phosphotyrosine-containing conjugates can be used as labeling components, platform molecules for immobilization on charged surfaces, or building blocks for constructing multivalent biomolecule assemblies.

4. SAR Studies And Peptidomimetics

Fmoc-Tyr(PO3(MDPSE)2)-OH enables structure-activity relationship studies and peptidomimetic construction by providing a stereodefined tyrosine-phosphate motif that can be systematically varied at the peptide level. The combination of Fmoc protection and a protected phosphorylated side chain supports iterative synthesis of analog panels where the phosphate group identity, deprotection state, or downstream functionalization can be controlled. The aromatic tyrosine ring and the phosphorylated phenolic oxygen together support modeling of key binding interactions often observed in phosphotyrosine-dependent recognition. Downstream, the synthesized peptide analogs can be converted into constrained scaffolds, used as reference standards for activity comparisons, or employed as intermediates for generating non-peptidic mimetics.

5. Process Chemistry Intermediate Preparation

Fmoc-Tyr(PO3(MDPSE)2)-OH is suitable as a manufacturing-oriented amino acid intermediate for producing phosphotyrosine-containing peptide building blocks at scale, where protection of the phosphate functionality supports robust synthetic handling. The Fmoc group provides a predictable orthogonal protection scheme for peptide coupling operations, while the carboxylic acid and side-chain phosphate protection reduce the likelihood of uncontrolled reactivity during intermediate storage and purification. The chiral amino acid framework supports stereochemical fidelity across downstream peptide assembly steps, which is important for reproducible product profiles in peptide manufacturing. The compound can be employed in process chemistry routes to prepare defined phosphotyrosine analogs for fine chemical production and for supplying research-grade peptide reagents used in industrial peptide synthesis pipelines.

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