2-Thiol-DL-tryptophan contains the indole-bearing amino acid skeleton of tryptophan with an additional thiol functionality at the 2-position, placing it in the class of sulfur-containing amino acid derivatives. The molecule bears an amino group and a carboxyl group consistent with an amino acid framework, while the 2-thiol side-chain feature can participate in redox-active or nucleophilic chemistry and may be present as a free thiol under appropriate conditions; "DL" indicates a racemic mixture at the stereocenter(s) implied by the amino acid structure. It is used in peptide and chemical biology research as a chemically modifiable tryptophan analogue and as a precursor for thiol-directed conjugation, crosslinking, or incorporation into synthetic peptide sequences where an indole/thiol combination provides a functional handle for further derivatization.
CAT No: CP25103
2-Thiol-DL-tryptophan is a tryptophan-derived amino acid featuring a thiol functionality at the 2-position on the indole ring system, provided as a DL mixture. This combination of an amino acid backbone with a reactive sulfhydryl group makes it useful for chemical modification workflows that require thiol-based reactivity while retaining the aromatic indole scaffold associated with tryptophan-like chemistry. In research settings, it is typically handled as a thiol-containing building block where controlled conjugation, derivatization, or thiol-mediated assembly is required.
1. Thiol-Based Bioconjugation
2-Thiol-DL-tryptophan is used as a thiol-bearing amino acid building block for preparing thiol-reactive conjugates and for introducing tryptophan-like aromatic features into labeling or immobilization schemes. Researchers in chemical biology and bioconjugation commonly incorporate this reagent into peptide or small-molecule constructs where sulfhydryl chemistry enables attachment to maleimide-, iodoacetamide-, or other thiol-reactive handles, supporting workflows such as protein labeling, affinity reagent preparation, and surface immobilization strategies. The presence of both an amino acid functionality and a thiol group supports downstream coupling into larger biomolecular architectures while preserving an indole-containing motif for hydrophobic/π-interaction-driven behavior in binding and assay contexts.
2. Peptide And Linker Functionalization
2-Thiol-DL-tryptophan is applied in peptide and linker design when a thiol handle and an indole aromatic unit are desired in the same building block. In custom peptide synthesis and peptide chemistry development, the reagent can be used to generate peptide segments or side-chain-modified intermediates that later undergo thiol-selective coupling or controlled derivatization, enabling construction of sulfhydryl-functional peptides for mechanistic studies, reagent generation, or material-binding peptide libraries. Because it is supplied as a DL mixture, it is commonly selected for chemical synthesis and derivatization work where stereochemical purity is not the primary driver, but thiol availability and indole scaffold incorporation are.
3. Chemical Biology Probe Synthesis
2-Thiol-DL-tryptophan supports chemical biology probe construction where thiol-based attachment is required to connect an indole-containing recognition motif to a reporter, affinity tag, or enrichment handle. Probe developers frequently use thiol-bearing amino acid derivatives to build modular labeling reagents that can be assembled through sulfhydryl chemistry onto activated surfaces or onto capture reagents used in pull-down workflows. The indole scaffold provides an aromatic platform that can contribute to noncovalent interactions relevant to probe performance in binding assays and interaction mapping, while the thiol functionality provides a practical chemical "attachment point" for integrating the probe into complex experimental systems.
4. Biomaterials Surface Immobilization
2-Thiol-DL-tryptophan is used in biomaterials and materials chemistry to introduce thiol functionality onto polymer, resin, or surface platforms for subsequent covalent linking or stable surface presentation of indole-containing motifs. Materials researchers often rely on thiol groups to enable controlled immobilization onto thiol-reactive or crosslinkable surfaces, supporting fabrication of functional coatings, biointerfaces, and immobilized ligand layers used in biochemical assays and protein interaction studies. The amino acid character of the reagent also helps integrate it into peptide-like surface chemistries and linker strategies where aromatic indole features are leveraged for surface interaction behavior.
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