Trp-Trp is an aromatic dipeptide exhibiting strong π-π stacking and solvent-sensitive fluorescence characteristics. Researchers use it to study indole-indole interactions, hydrophobic clustering, and excited-state behavior. The motif supports biophysical and photochemical analyses. Its simplicity allows precise mechanistic insights.
CAT No: R2426
CAS No:20696-60-0
Synonyms/Alias:H-TRP-TRP-OH;Trp-Trp;20696-60-0;L-Tryptophan, L-tryptophyl-;tryptophyltryptophan;l-tryptophyl-l-tryptophan;N-L-Tryptophyl-L-tryptophan;Tryptophyl-Tryptophan;L-Trp-L-Trp;CHEBI:74876;H-L-Trp-L-Trp-OH;L-Tryptophanyl-L-tryptophan;(2S)-2-[[(2S)-2-amino-3-(1H-indol-3-yl)propanoyl]amino]-3-(1H-indol-3-yl)propanoic acid;CHEMBL286852;(S)-2-((S)-2-Amino-3-(1H-indol-3-yl)Propanamido)-3-(1H-indol-3-yl)Propanoic acid;L-Tryptophan, N-L-tryptophyl-;tryptophan-tryptophan;MFCD00037959;tryptophanyl-tryptophan;1-tryptophan-1-tryptophan;SCHEMBL5583839;HY-P4647;WW;BDBM50188479;NSC 524592;AS-76631;DA-54126;FT108202;CS-0655449;D94607;Q27144986;(S)-2-[(S)-2-Amino-3-(1H-indol-3-yl)-propionylamino]-3-(1H-indol-3-yl)-propionic acid;2-[1-amino-2-(1H-3-indolyl)-(1S)-ethylcarboxamido]-3-(1H-3-indolyl)-(2S)-propanoic acid;2-[2-Amino-3-(1H-indol-3-yl)-propionylamino]-3-(1H-indol-3-yl)-propionic acid;
Trp-Trp, also known as Tryptophan-Tryptophan dipeptide, is a synthetic peptide composed of two tryptophan residues linked via a peptide bond. As a member of the dipeptide class, it presents unique physicochemical properties, including notable aromaticity and hydrophobicity, which make it an important tool in peptide research and biochemistry. The presence of two indole side chains imparts distinctive spectroscopic characteristics, enabling researchers to probe peptide interactions, folding, and transport phenomena. Its defined structure and manageable size facilitate reproducible studies, making it a preferred model for investigating peptide behavior and function in various biological and analytical contexts.
Peptide transport studies: Trp-Trp serves as a valuable substrate for dissecting the mechanisms of peptide transporter systems in cellular and membrane models. Its dipeptide structure and aromatic side chains allow for the examination of transport kinetics, substrate specificity, and competitive inhibition in peptide transporter assays. Researchers employ this compound to better understand the molecular basis of oligopeptide uptake in microbial, plant, and animal cells, thereby contributing to the elucidation of nutrient absorption and peptide-based drug delivery mechanisms.
Protein folding and aggregation research: The dipeptide's dual tryptophan residues make it an informative probe for studying hydrophobic interactions, aromatic stacking, and early events in protein folding or aggregation. By incorporating Trp-Trp into model systems, scientists can monitor changes in fluorescence or circular dichroism signals, enabling real-time analysis of conformational dynamics. Such studies provide insight into the role of aromatic residues in stabilizing secondary structures or mediating aggregation pathways relevant to amyloid formation and protein misfolding disorders.
Analytical standard for chromatography and spectroscopy: Due to its well-defined chemical structure and distinctive UV absorbance properties, Trp-Trp is frequently used as a calibration standard in chromatographic and spectroscopic methods. Its strong absorbance in the ultraviolet region, attributed to the indole moieties, facilitates sensitive detection and quantification in HPLC, capillary electrophoresis, and fluorescence-based assays. Utilization as a reference compound supports method development, validation, and routine quality control in peptide analysis workflows.
Peptide synthesis optimization: In the context of solid-phase peptide synthesis and related methodologies, Trp-Trp provides a practical model for optimizing coupling conditions, protecting group strategies, and purification protocols. Its sequence, featuring two bulky and reactive residues, challenges synthetic processes and highlights potential pitfalls in resin loading, side-chain protection, and cleavage steps. Systematic use of this dipeptide aids chemists in refining synthetic approaches for more complex aromatic peptides.
Structure-activity relationship (SAR) studies: The defined aromatic dipeptide structure of Trp-Trp allows for systematic evaluation of how indole-rich sequences influence biological recognition, binding affinity, and molecular interactions. By comparing its behavior to other dipeptides or incorporating it into longer peptide chains, researchers can dissect the contribution of aromatic stacking, hydrophobicity, and side-chain orientation to peptide-macromolecule interactions. These insights are critical for the rational design of peptide-based ligands, inhibitors, and biomaterials with tailored properties.
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