5-Methyl-D-tryptophan is a non-proteinogenic, D-configured tryptophan analogue featuring an indole side chain bearing a methyl substituent at the 5-position, along with the standard amino acid backbone containing a free amino group and a free carboxyl group. The indole nitrogen and the methylated aromatic system define its side-chain electronic character, while the D stereochemistry specifies the relative configuration at the alpha carbon for incorporation into chemically defined peptide or labeling constructs. In peptide chemistry and chemical biology workflows, this amino acid is used as a substrate building block to introduce a methyl-modified indole motif for structure-activity studies, conformational probing, and analytical method development involving tryptophan-like aromatic residues.
CAT No: CP24902
5-Methyl-D-tryptophan is a D-configured tryptophan analog bearing a methyl substituent at the 5-position of the indole ring, providing a sterically and electronically modified indole scaffold relative to natural tryptophan. This non-proteinogenic amino acid is frequently used in chemical biology and analytical workflows where indole-specific reactivity and mass/structure discrimination are required, including studies that benefit from the D-configuration to reduce confounding stereochemical effects. Its aromatic indole functionality also supports downstream derivatization for peptide and probe-related applications, while the stable, defined structure makes it useful as a reference material in LC-MS and related characterization.
1. Peptidomimetic Building Block
5-Methyl-D-tryptophan is used as an indole-modified amino acid building block for constructing peptidomimetics and peptide analogs in medicinal chemistry and chemical biology programs. Researchers incorporate this residue to probe how indole substitution and D-stereochemistry influence local conformation, physicochemical properties, and structure-function relationships in short peptides or peptide-like scaffolds. The methylated indole ring provides a distinct structural handle compared with canonical tryptophan, supporting SAR-style comparisons in custom peptide synthesis workflows where defined, non-natural residues are required.
2. Chemical Biology Probes
5-Methyl-D-tryptophan is applied in chemical biology experiments that rely on indole chemistry for labeling, detection, or competitive binding readouts. The substituted indole scaffold enables selective chemical differentiation from endogenous tryptophan-containing systems, which is valuable when researchers need to track a specific residue class in complex mixtures. Because the compound is defined as a D-amino acid analog, it is often chosen to minimize ambiguity in stereochemical interpretation during probe design, peptide tagging strategies, or qualitative/quantitative residue-level studies.
3. Analytical Reference Standard
5-Methyl-D-tryptophan is widely used as a structural standard for method development and verification in LC-MS workflows targeting tryptophan analogs and indole-containing metabolites or labeled species. Analytical teams use it to confirm chromatographic behavior, retention time, and mass spectral features for 5-methylated indole amino acid species, supporting accurate identification and improved confidence in peak assignment. The defined stereochemistry and ring substitution make it particularly useful for distinguishing this analog from natural tryptophan and other tryptophan-derived standards during routine instrument qualification and troubleshooting.
4. Stable Isotope-Compatible Derivatization
5-Methyl-D-tryptophan is commonly employed as a precursor for preparing derivatized standards or labeled analogs used in quantitative analytical studies of indole amino acid chemistry. In workflows where derivatization is used to enhance ionization, improve chromatographic separation, or create a measurable tag, the methyl-substituted D-indole scaffold provides a consistent starting point that preserves the diagnostic indole signature. This makes it a practical choice for laboratories building panels of chemically defined indole standards for comparative analysis across related amino acid analogs.
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