5-Hydroxy-L-tryptophan contains an indole-based amino acid scaffold in which the tryptophan side chain bears a 5-hydroxy substituent on the aromatic ring, while the molecule retains both an amino group and a carboxyl group characteristic of an α-amino acid. The stated L stereochemistry defines the configuration at the α-carbon, and the phenolic hydroxyl on the indole ring provides an additional hydrogen-bonding and potential redox-active functionality relative to unmodified tryptophan. As a natural amino acid derivative, it is used in peptide and protein-related studies where indole hydroxyl substitution is required, including the preparation of modified tryptophan-containing peptides and analytical or labeling workflows that distinguish hydroxylated indole chemistry from standard tryptophan.
CAT No: CP24701
5-Hydroxy-L-tryptophan is a hydroxylated, proteinogenic amino acid related to the tryptophan scaffold, featuring an indole side chain bearing a 5-hydroxy substituent and the stereochemistry consistent with L-amino acid building blocks. This aromatic, phenolic indole motif makes it a useful reagent for preparing tryptophan-derived peptides and for constructing analytical or chemical-biology standards where the hydroxyl substitution is a key structural feature. Researchers also use it as a defined precursor for indole/phenol chemistry studies that require an amino-acid handle for downstream derivatization or incorporation into peptide-like structures.
1. Tryptophan-Analog Peptide Building
5-Hydroxy-L-tryptophan is used by peptide chemists as a tryptophan analog building block when a hydroxylated indole residue is required in a peptide sequence. Its amino acid functionality supports incorporation into custom peptides for structure-function studies, including investigations of how indole hydroxylation influences local polarity, hydrogen-bonding capability, and aromatic microenvironment effects. This reagent is particularly relevant for laboratories building peptide libraries or single-residue substituted peptides to probe site-specific effects in binding, folding, or recognition assays.
2. Chemical Biology Indole Chemistry
5-Hydroxy-L-tryptophan is applied in chemical biology workflows that rely on defined indole/phenol-containing amino acid motifs as starting points for probe construction and derivatization. The combination of an indole ring and a phenolic hydroxyl group enables targeted functional transformations used to generate well-defined aromatic phenol-containing intermediates for studying reaction outcomes, labeling strategies, or aromatic reactivity in controlled chemical systems. Researchers in chemical biology and biomolecular chemistry commonly select this scaffold when they need an amino-acid-derived handle while preserving the hydroxylated indole identity in the final probe or intermediate.
3. Analytical Standards For LC-MS
5-Hydroxy-L-tryptophan is frequently used as a reference material for analytical method development and quantification workflows that distinguish hydroxylated tryptophan species by mass spectrometry or chromatographic separation. Analytical groups use it to prepare calibration solutions, retention-time/ionization behavior benchmarks, and compound-specific controls when monitoring tryptophan-related analytes in complex matrices. Because the hydroxyl substitution is structurally specific, it supports more reliable identification and quantitation of 5-hydroxyindole/tryptophan-derived signals compared with using generic tryptophan standards.
4. Pharmaceutical Intermediate Development
5-Hydroxy-L-tryptophan is also used as a defined chiral amino-acid intermediate in pharmaceutical intermediate development programs that require a hydroxylated indole motif as a key structural element. Process and R&D chemists incorporate this scaffold into downstream synthetic sequences to access indole/phenol-containing intermediates used for medicinal chemistry lead optimization and SAR studies. The presence of both the amino acid functional handle and the hydroxylated indole framework helps teams maintain structural fidelity from early-stage intermediate design through to final analog synthesis.
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