2-Nitro-D-tryptophan is a D-configured tryptophan derivative in which a nitro group is installed at the 2-position of the indole ring, yielding a non-proteinogenic, aromatic amino acid with an indole-based side chain. The molecule contains a free amino group and a free carboxyl group alongside the substituted indole functionality, and the nitro substituent provides an electron-withdrawing handle that can influence aromatic reactivity and spectroscopic behavior relative to unmodified tryptophan. As an amino acid building block for peptide and labeling studies, it is used to introduce a nitro-substituted indole motif into synthetic peptides or to support structure-activity and chemical biology experiments that probe how indole electronics and substitution patterns affect binding, reactivity, or detection.
CAT No: CP25002
2-Nitro-D-tryptophan is a D-configured tryptophan analog bearing an ortho nitro group on the indole ring, making it a useful aromatic amino acid for studies that require altered electronic properties and distinct reactivity compared with standard tryptophan. This non-proteinogenic, side-chain-modified amino acid is commonly employed as a chemically defined probe or building block in peptide and protein chemistry where the indole environment is intentionally perturbed. Its stable, well-defined structure supports reproducible incorporation into synthetic peptides and downstream analytical workflows that distinguish it from native tryptophan.
1. Peptide Building Block Use
2-Nitro-D-tryptophan is used as an indole-modified amino acid building block for preparing peptides that probe how ortho substitution and D-stereochemistry influence local structure, backbone/side-chain conformations, and chemical stability. Peptide synthesis groups and custom peptide manufacturers rely on this reagent to generate defined tryptophan surrogates for structure-function studies, including mapping of aromatic-residue contributions to peptide behavior. Because the nitro group is directly attached to the indole ring, the residue provides a distinct chemical signature that can be tracked during purification and characterization of the resulting peptide products.
2. Chemical Biology Aromatic Probing
2-Nitro-D-tryptophan is applied in chemical biology workflows that use tryptophan analogs to interrogate aromatic microenvironments, ligand-residue proximity, and local reactivity in biomolecular systems. Researchers incorporate this amino acid into peptides or protein fragments to create a controllable "tryptophan-like" site whose electronic character differs from native indole, supporting experiments that require discrimination between substituted and unsubstituted aromatic residues. In practice, it is frequently selected when investigators want a chemically distinct indole variant for mechanistic studies of aromatic interactions or for designing experiments where the indole environment must be perturbed in a site-specific manner.
3. Protein Engineering Surrogate Residue
2-Nitro-D-tryptophan is used as a non-natural tryptophan surrogate in protein engineering and protein chemistry studies that require a defined aromatic residue replacement without relying on native tryptophan. Protein scientists and structural biology teams can incorporate this residue into synthetic protein constructs or peptide segments to evaluate how the ortho nitro substitution and D-configuration alter residue-level properties relevant to folding, stability, or interaction geometry in the engineered context. The strong structural definition of the nitro-indole motif also supports comparative studies where changes in behavior can be attributed to the engineered residue rather than to heterogeneous mixtures of aromatic analogs.
4. Analytical Reference for Indole Variants
2-Nitro-D-tryptophan is employed as a chemically defined reference material for analytical method development and validation that distinguishes ortho-nitro-indole chemistry from standard tryptophan. LC-MS and related characterization workflows benefit from having a structurally specific indole analog to support identification, retention-time mapping, and method robustness when analyzing peptides or biomolecules containing substituted tryptophan residues. Analytical laboratories and peptide characterization groups commonly use such standards to confirm incorporation of nitro-indole variants and to improve confidence in assignment of aromatic-containing fragments during routine characterization of synthetic peptide libraries.
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