4-Phosphonomethyl-D-Phenylalanine is a D-phenylalanine-derived amino acid derivative bearing a phenyl side chain and an additional phosphonomethyl substituent at the 4-position of the aromatic ring. The molecule contains both an amino group and a carboxyl group, and the phosphonate functionality provides a strongly acidic, metal-binding handle that can participate in ionic interactions and influence solubility and conformational preferences in peptide contexts. It is used in peptide chemistry and chemical biology as a precursor for incorporating a phosphonate-bearing aromatic residue into designed analogues, supporting studies that examine phosphorylation-mimetic behavior, phosphate recognition motifs, or structure-activity relationships involving negatively charged side chains.
CAT No: CP16502
4-Phosphonomethyl-D-Phenylalanine is a D-configured phenylalanine analog bearing a phosphonomethyl substituent, providing a strongly acidic, phosphate-like functionality that supports ionic interactions and stable binding motifs in chemical biology workflows. This amino acid derivative is commonly handled as a research-grade building block for designing peptide and peptidomimetic structures where a phosphonate group is used to emulate phosphorylated residues. Its stereochemical definition and phosphonate functionality make it particularly relevant for downstream synthesis of phosphoryl-mimic ligands and for analytical or mechanistic studies requiring a defined, non-hydrolyzable anionic side chain.
1. Phosphoryl-Mimic Peptide Synthesis
4-Phosphonomethyl-D-Phenylalanine is used as a phosphoryl-mimicking amino acid building block in custom peptide synthesis and peptidomimetic construction, where an anionic phosphonate side chain is required at a specific residue position. Researchers incorporate this D-amino acid into peptides to generate defined charge patterns that resemble phosphoserine/phosphothreonine-like motifs while avoiding variability associated with labile phosphate groups. In practice, this enables structure-activity relationship studies of phosphorylation-dependent recognition, receptor/effector binding assays using synthetic peptide libraries, and mechanistic investigations that rely on a stable negative charge surrogate. The presence of the phosphonomethyl group also supports robust downstream handling in peptide workflows where a persistent acidic functionality is needed for purification and characterization by chromatography and mass spectrometry.
2. Enzyme Mechanism And Inhibition Studies
4-Phosphonomethyl-D-Phenylalanine is applied in chemical biology and enzymology studies aimed at probing phosphorylation-dependent processes and substrate recognition mechanisms. The phosphonate substituent provides a stable, strongly ionized group that can be used to interrogate how enzymes accommodate anionic side chains at defined positions, including studies of kinases, phosphatases, and phospho-binding domains where phosphoryl mimicry improves interpretability. Investigators commonly use D-configured analogs to reduce confounding effects from proteolysis and to help attribute observed behavior to the designed side-chain chemistry rather than to rapid degradation. In these workflows, the compound is typically incorporated into short peptides, peptidomimetics, or substrate analogs that are then evaluated in biochemical assays and binding studies to map structure-function relationships.
3. Binding Probe And Affinity Reagent Design
4-Phosphonomethyl-D-Phenylalanine supports the development of affinity reagents and binding probes that target phospho-recognition elements through a defined phosphonate pharmacophore. Chemical biology teams use this residue analog to build peptide-based probes for studying protein-protein interactions involving phospho-binding modules, as well as to create competitive ligands for mapping specificity of recognition surfaces. The D-configuration and phosphonomethyl group help maintain a consistent spatial presentation of the anionic functionality, which is critical when comparing libraries of phosphonate-bearing analogs. These probes are commonly advanced into workflows involving pull-down experiments, competition binding formats, and LC-MS-based characterization of probe-target complexes, where a stable negative charge improves reproducibility relative to labile phosphate-containing constructs.
4. Analytical Standards For Phosphonate-Containing Peptides
4-Phosphonomethyl-D-Phenylalanine is also used to prepare analytical standards and reference materials for characterization of phosphonate-containing peptide products and related synthetic intermediates. In peptide and peptidomimetic development, defined phosphonate-bearing residues help calibrate and validate LC-MS workflows, including retention behavior and mass-based identification of phosphonate-modified structures. Researchers and method developers leverage the compound as a structural reference for confirming incorporation of the phosphonomethyl side chain during iterative synthesis and purification, particularly when monitoring mixtures of closely related analogs. This application is especially valuable in labs performing routine peptide analytics where consistent, non-labile anionic functionality improves assignment confidence for phosphonate-containing species.
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