4-Carboxy-D-tryptophan contains an indole-containing amino acid framework in which an additional carboxyl group is located at the 4-position of the indole ring, classifying it as a tryptophan derivative with an extra acidic functionality. The molecule bears an amino group and a carboxylic acid at the α-position and is specified as the D stereochemical form, with the side-chain indole substituent introducing a second ionizable group that can influence charge distribution and hydrogen-bonding behavior. As a nonstandard amino acid for peptide and analog synthesis, it can be used as a building block to introduce indole-based motifs bearing an extra carboxyl handle for structure-activity studies, chemical biology labeling strategies, and preparation of more complex tryptophan-containing peptide derivatives.
CAT No: CP24602
4-Carboxy-D-tryptophan is a D-configured tryptophan analog bearing an additional carboxyl group on the indole ring, giving it an expanded aromatic/acidic side-chain functionality and a distinct physicochemical profile compared with standard tryptophan. This non-proteinogenic amino acid is commonly handled as a research-grade building block for peptide and peptidomimetic synthesis where the indole carboxylate can act as a structural element for binding-site mimicry, charge distribution tuning, or downstream derivatization. Its stereochemical specificity and extra carboxyl functionality also make it useful for analytical method development and for preparing defined standards in chemical biology workflows that require tryptophan-like aromatic residues with controlled acidity.
1. Peptidomimetic Building Blocks
4-Carboxy-D-tryptophan is used as an aromatic, acidic amino acid building block for constructing peptidomimetics and modified peptides in medicinal chemistry research. The indole-linked carboxyl group provides an additional handle for tuning local charge and hydrogen-bonding patterns within a sequence, which is valuable when researchers aim to emulate tryptophan-containing motifs while altering electrostatics and side-chain geometry. D-configuration further supports studies that probe stereochemical effects on conformation, protease tolerance, and structure-activity relationships in non-natural peptide series prepared by custom peptide synthesis.
2. Protein Interaction Mapping
4-Carboxy-D-tryptophan supports chemical biology experiments that require defined, tryptophan-like aromatic residues with an extra acidic functionality for studying molecular recognition and interaction landscapes. Researchers incorporate this residue into peptides or peptide fragments used as probes for mapping binding interfaces, where the indole carboxylate can participate in specific contacts or modulate solvent exposure relative to native tryptophan. The D stereochemistry also helps differentiate probe behavior from proteinogenic analogs, which is useful when comparing binding responses across stereochemically defined peptide panels.
3. Analytical Standards And Assays
4-Carboxy-D-tryptophan is applied as a reference material for analytical method development and validation involving tryptophan-derivative detection, including LC-based workflows that distinguish aromatic amino acids by retention and ionization behavior. The additional carboxyl group provides a distinct chemical signature that can improve separation from conventional tryptophan species and related indole-containing compounds, enabling more reliable quantitation or identification in complex mixtures. Laboratories use it to prepare calibration or qualification standards for amino acid profiling, peptide hydrolysate analysis, and characterization of synthetic peptide intermediates where defined composition is required.
4. Pharmaceutical Intermediate Development
4-Carboxy-D-tryptophan is also used as a specialized intermediate in the development of non-natural amino acid derivatives and advanced building blocks for downstream medicinal chemistry programs. The extra carboxyl functionality expands the set of derivatization options for generating protected or activated analogs that feed into larger synthetic sequences, including the preparation of constrained or functionalized aromatic fragments. Its D stereochemical definition supports projects that require stereopure inputs for structure-property studies, where maintaining stereochemical integrity of the aromatic residue is critical for reproducible downstream chemistry and defined final compound characterization.
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