2-Thiol-D-tryptophan is a D-configured tryptophan derivative in which the indole ring bears a thiol functionality at the 2-position, classifying it as a non-standard, sulfur-functionalized amino acid for peptide and chemical biology applications. The molecule contains both an amino group and a carboxyl group on the amino acid backbone, while the side chain combines the indole scaffold with a reactive thiol that can participate in disulfide formation or other thiol-mediated conjugation chemistries under appropriate conditions. As a structurally modified tryptophan analogue, it is used as a precursor for incorporating sulfur-bearing aromatic residues into peptide constructs and for introducing a chemically addressable handle for labeling, crosslinking, or structure-activity studies where indole-thiol functionality is required.
CAT No: CP25102
2-Thiol-D-tryptophan is a D-configured tryptophan derivative bearing a thiol functionality at the 2-position on the indole ring. This side-chain modification introduces a chemically addressable sulfur nucleophile that is commonly leveraged for selective conjugation, crosslinking, and thiol-directed derivatization in chemical biology workflows. As a non-proteinogenic amino acid building block, it is typically handled as a reactive intermediate for constructing sulfur-containing tryptophan analogs and for introducing a defined thioindole motif into peptides or functional materials.
1. Thiol-Directed Bioconjugation
2-Thiol-D-tryptophan is used by chemical biology and bioconjugation teams to install a thiol handle onto tryptophan-based ligands, peptides, and protein-reactive constructs where sulfur chemistry is required for downstream coupling. The indole-tethered thiol enables controlled derivatization into thioether or disulfide-containing linkages, supporting workflows such as preparing conjugate standards, generating modified binding reagents, or producing site-specific tryptophan analogs for mechanistic studies. Researchers often select the D-configuration and the 2-thiol substitution to reduce ambiguity from native tryptophan reactivity and to provide a distinct chemical signature in labeling and analytical readouts.
2. Sulfur-Containing Peptide Building Block
2-Thiol-D-tryptophan is applied as a non-natural amino acid building block for peptide synthesis when a thiol-functional tryptophan analog is needed for structure-function studies. Peptide and medicinal chemistry groups use this residue to introduce a reactive sulfur site within tryptophan-containing sequences, enabling subsequent on-peptide derivatization, disulfide formation strategies, or controlled post-assembly functionalization. The indole-based thiol position supports the development of tryptophan mimetics that can be tracked by mass spectrometry and used to probe how sulfur substitution affects peptide conformation, local environment, and chemical stability under labeling conditions.
3. Crosslinking And Surface Immobilization
2-Thiol-D-tryptophan is commonly used in biomaterials and materials chemistry to create sulfur-mediated linkages for crosslinking and immobilization strategies. The thiol functionality allows incorporation into polymer networks, coating layers, or surface-functionalized platforms where thioether/disulfide-forming chemistry is used to anchor biomolecular components. In practice, researchers employ this amino acid derivative to build tryptophan-containing linkers for attaching capture molecules to substrates, generating immobilized peptide libraries, or preparing chemically defined interfaces for protein-interaction experiments and downstream analytical characterization.
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