N-Fmoc-4-methoxy-L-tryptophan features a methoxy-modified indole ring that adjusts electronic distribution and aromatic stacking. The modification influences fluorescence properties and peptide folding behavior. Researchers use it to probe solvent effects, stacking interactions, and conformational dynamics. Its Fmoc protection enables efficient solid-phase assembly.
CAT No: R2138
CAS No:1205553-56-5
Synonyms/Alias:N-Fmoc-4-methoxy-L-tryptophan;1205553-56-5;(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-3-(4-methoxy-1H-indol-3-yl)propanoic acid;(2S)-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-3-(4-methoxy-1H-indol-3-yl)propanoic acid;SCHEMBL16503357;MFCD01632013;Fmoc-5-methoxy-L-tryptophan, AldrichCPR;CS-0335021;F79873;(2S)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-(4-methoxy-1H-indol-3-yl)propanoic acid;
N-Fmoc-4-methoxy-L-tryptophan is a specialized amino acid derivative commonly utilized in peptide synthesis and advanced biochemical research. Structurally, it features an N-terminal 9-fluorenylmethyloxycarbonyl (Fmoc) protecting group and a methoxy substitution at the 4-position of the indole ring, conferring unique electronic and steric properties. The compound's modified tryptophan backbone allows for the introduction of distinct chemical functionalities into peptides and proteins, making it particularly valuable for studies focused on structure-activity relationships, conformational analysis, and molecular engineering. Its compatibility with standard solid-phase peptide synthesis (SPPS) protocols and the ability to modulate aromatic interactions further enhance its research appeal.
Peptide Synthesis: N-Fmoc-4-methoxy-L-tryptophan serves as a protected amino acid building block in solid-phase peptide synthesis, enabling the incorporation of a methoxy-modified tryptophan residue into synthetic peptides. The Fmoc group allows for efficient stepwise elongation on resin, while the 4-methoxy substitution introduces subtle electronic effects that can influence peptide folding and intermolecular interactions. This makes the compound especially useful in the design and assembly of peptides with tailored functional or biophysical properties, supporting projects that require precise control over aromatic side-chain chemistry.
Structure-Activity Relationship Studies: The introduction of a 4-methoxy group on the indole ring provides a means to systematically probe the role of tryptophan's aromaticity and electron distribution within biologically active peptides. Researchers employ this derivative to investigate how such modifications affect receptor binding, enzyme recognition, or protein-protein interactions. By comparing analogs with and without the methoxy substitution, valuable insights can be gained into the molecular determinants of bioactivity, selectivity, and conformational stability in peptide-based systems.
Fluorescence and Spectroscopic Analysis: The unique electronic properties of the 4-methoxy-substituted indole ring can alter the spectroscopic characteristics of peptides containing this residue. Scientists utilize these changes to study peptide folding, dynamics, and local environments via fluorescence spectroscopy or other photophysical techniques. The altered emission and absorption profiles may facilitate the development of novel probes or the tracking of peptide behavior in complex biochemical assays, enhancing the analytical toolkit available for peptide research.
Protein Engineering and Design: Incorporation of N-Fmoc-4-methoxy-L-tryptophan into synthetic peptides or recombinant proteins allows researchers to introduce non-canonical amino acids with distinct side-chain properties. This approach is valuable in protein engineering, where the goal is to modulate aromatic stacking, hydrophobicity, or electronic interactions within protein cores or interfaces. The compound's structural features can be exploited to create novel protein architectures, stabilize specific conformations, or investigate the effects of aromatic modifications on protein function.
Analytical Method Development: The presence of the Fmoc group and the methoxy-modified indole ring offers unique chromatographic and detection characteristics, which can be leveraged in the development and validation of analytical methods for peptide mapping or quality control. Analytical chemists use this derivative to optimize separation protocols, improve detection sensitivity, or establish reference standards for modified tryptophan residues during peptide characterization workflows. Its distinctive properties facilitate the reliable identification and quantification of modified peptides in complex mixtures, supporting rigorous analytical demands in research and development settings.
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