2-Thiol-L-tryptophan is an L-tryptophan derivative in which the indole ring of the tryptophan scaffold bears a thiol substituent at the 2-position, classifying it as a sulfur-functionalized, proteinogenic amino acid analogue. The molecule contains an amino group and a carboxyl group characteristic of amino acids, while the thiol side-chain functionality can undergo reversible oxidation to disulfides or form thioether linkages under appropriate conditions, with stereochemistry indicated as L by the product name. In research and peptide chemistry, it is used as a chemically defined amino acid building block for preparing modified peptides and conjugates that incorporate an indole-linked thiol handle for controlled coupling, crosslinking, or analytical labeling workflows.
CAT No: CP25101
2-Thiol-L-tryptophan is a sulfur-functionalized tryptophan analog featuring the indole side chain characteristic of tryptophan chemistry alongside a thiol group at the 2-position, enabling thiol-directed reactivity and site-specific conjugation strategies. As a free amino acid with a reactive sulfhydryl functionality, it is commonly selected when researchers need a tryptophan-derived scaffold while introducing a controlled handle for coupling, crosslinking, or immobilization. Its L-configuration supports use in peptide and protein-related workflows where stereochemical fidelity of the amino acid backbone is important.
1. Bioconjugation Coupling
2-Thiol-L-tryptophan is used as a tryptophan-derived thiol building block for bioconjugation workflows where a sulfhydryl handle is required for attachment to biomolecules, polymers, or surfaces. Researchers employ it to introduce a reactive thiol at defined positions in peptide conjugates, enabling downstream coupling chemistries such as disulfide exchange strategies or thiol-reactive crosslinking routes. This amino acid is particularly relevant in chemical biology and protein chemistry when a tryptophan-like aromatic motif is desired alongside a controllable sulfur functionality for conjugate assembly and purification-friendly thiol-based intermediate handling.
2. Peptide Crosslinking Studies
2-Thiol-L-tryptophan supports peptide and protein interaction studies that rely on thiol-mediated crosslink formation or thiol-to-thiol linking strategies. In peptide chemistry, it is incorporated into synthetic peptides to create sulfur-containing reactive sites that can be used to stabilize transient conformations, generate defined intramolecular or intermolecular links, or produce crosslinked standards for method development. Because the product retains the tryptophan indole character while adding a thiol at the 2-position, it is frequently chosen for experiments where aromatic tryptophan chemistry is part of the design rationale and a thiol functionality is needed to drive controlled crosslinking or post-synthetic modification.
3. Surface Immobilization Chemistry
2-Thiol-L-tryptophan is applied in biomaterials and surface functionalization programs that require robust thiol-based attachment to activated materials. Materials scientists and interface-focused researchers use the sulfhydryl group to tether tryptophan-containing motifs onto gold surfaces, thiol-reactive polymer coatings, or other thiol-compatible substrates to create protein-binding or peptide-presenting interfaces. This use leverages the combination of a tryptophan-derived aromatic side chain and a reactive thiol handle, supporting the fabrication of immobilized peptide ligands, capture surfaces, and immobilized standards for binding and adsorption studies where surface chemistry and functional group placement are critical.
4. Analytical Thiol-Tag Standards
2-Thiol-L-tryptophan is also used to prepare analytical reference materials and thiol-tagging controls in workflows that monitor sulfhydryl chemistry or quantify thiol-containing species. In LC-MS method development and analytical chemistry, it can serve as a chemically defined thiol-containing amino acid standard for verifying derivatization performance, retention behavior, and signal response under thiol-reactive assay conditions. Researchers commonly select this compound when they need a tryptophan-based scaffold with a reactive thiol group, enabling consistent calibration or process controls for experiments involving thiol labeling, thiol-specific detection reagents, or thiol stability assessments during sample handling.
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