N-Fmoc-4-methyl-L-tryptophan is an indole-modified amino acid with altered aromatic electronics and steric influence. The residue supports studies on fluorescence behavior, stacking interactions, and conformational restriction. Researchers employ it in constructing aromatic-rich peptide domains. Its Fmoc protection ensures compatibility with solid-phase synthesis.
CAT No: R2136
CAS No:2411871-30-0
Synonyms/Alias:N-Fmoc-4-methyl-L-tryptophan;2411871-30-0;N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-4-methyl-L-tryptophan;(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-3-(4-methyl-1H-indol-3-yl)propanoic acid;(2S)-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-3-(4-methyl-1H-indol-3-yl)propanoic acid;MFCD01632012;CS-0439393;F79872;
N-Fmoc-4-methyl-L-tryptophan is a synthetically modified amino acid derivative featuring an N-terminal 9-fluorenylmethyloxycarbonyl (Fmoc) protecting group and a methyl substitution at the 4-position of the indole ring. Structurally, it combines the core framework of L-tryptophan with chemical modifications that enhance its utility in peptide synthesis and structure-activity relationship studies. The Fmoc group confers selective protection during solid-phase peptide synthesis (SPPS), while the 4-methyl substitution introduces steric and electronic variations that can be exploited in advanced biochemical research. As a result, this compound serves as a valuable building block for investigating the effects of tryptophan modification on peptide structure, function, and biological interactions.
Peptide Synthesis: N-Fmoc-4-methyl-L-tryptophan is primarily utilized as a protected amino acid monomer in Fmoc-based solid-phase peptide synthesis. Its orthogonal Fmoc group allows for stepwise elongation of peptide chains under mild deprotection conditions, minimizing side reactions and preserving the integrity of sensitive functional groups. The 4-methyl modification provides a unique steric profile, enabling researchers to incorporate non-canonical residues into synthetic peptides for the exploration of structure-function relationships or to design analogs with altered conformational preferences.
Peptide Engineering: The incorporation of 4-methyl-L-tryptophan residues into peptide scaffolds enables the systematic investigation of indole ring modifications on peptide folding, receptor binding, and biological activity. By substituting natural tryptophan with its 4-methyl analog, researchers can probe the influence of steric bulk and electronic effects on peptide-protein interactions, stability, and resistance to enzymatic degradation. Such engineered peptides are valuable tools for elucidating the determinants of molecular recognition and for developing novel biomolecular probes.
Structure-Activity Relationship Studies: The use of N-Fmoc-4-methyl-L-tryptophan in combinatorial peptide libraries or targeted analog synthesis supports detailed structure-activity relationship (SAR) analyses. By varying the position and nature of indole ring substituents, scientists can assess how subtle chemical changes impact biological function, binding affinity, or selectivity. This approach is instrumental in the rational design of peptide-based ligands, inhibitors, or modulators for research applications in biochemistry and molecular biology.
Protein Modification and Labeling: The unique chemical properties of 4-methyl-L-tryptophan derivatives facilitate their use in site-specific protein modification protocols. By incorporating this residue into recombinant proteins or synthetic fragments, researchers can introduce spectroscopic probes, cross-linkers, or other functional groups at defined sites. Such modifications enable the study of protein dynamics, folding pathways, or intermolecular interactions using advanced analytical techniques, including fluorescence spectroscopy and mass spectrometry.
Analytical Method Development: The distinctive chromatographic and spectroscopic characteristics imparted by the Fmoc and 4-methyl groups make this compound a useful standard or reference in analytical method development. Its defined structure allows for the calibration and validation of HPLC, LC-MS, or NMR protocols used to monitor peptide synthesis, assess purity, or characterize modified amino acids. Employing such standards enhances the reliability and reproducibility of analytical workflows in peptide chemistry and related research fields.
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