n-Fmoc-6-methyl-l-tryptophan is a protected, methylated tryptophan analog with altered indole electronics. The modification influences aromatic stacking, polarity, and hydrogen-bonding capabilities. Researchers use it to manipulate fluorescence properties and probe conformational restrictions. Its Fmoc protection supports integration into complex peptide designs.
CAT No: R2134
CAS No:908846-99-1
Synonyms/Alias:n-fmoc-6-methyl-l-tryptophan;908846-99-1;(S)-2-((((9H-Fluoren-9-yl)methoxy)carbonyl)amino)-3-(6-methyl-1H-indol-3-yl)propanoic acid;(2S)-2-{[(9H-fluoren-9-ylmethoxy)carbonyl]amino}-3-(6-methyl-1H-indol-3-yl)propanoic acid;N-[(9H-Fluoren-9-ylmethoxy)carbonyl]-6-methyl-L-tryptophan;DTXSID301192962;MFCD29917531;BS-44476;CS-0439438;F73824;(2S)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-3-(6-methyl-1H-indol-3-yl)propanoic acid;
n-Fmoc-6-methyl-l-tryptophan is a chemically protected, non-canonical amino acid derivative, structurally based on tryptophan with a 6-methyl substitution on the indole ring and an N-terminal 9-fluorenylmethoxycarbonyl (Fmoc) group. This compound is primarily valued in peptide chemistry for its role as a building block in solid-phase peptide synthesis (SPPS), where it enables the incorporation of a modified tryptophan residue with enhanced steric and electronic properties. The methyl group at the 6-position of the indole ring imparts unique conformational and functional characteristics, making it an important tool for researchers seeking to investigate structure-activity relationships, modulate peptide function, or design novel biomolecules. Its Fmoc protection ensures compatibility with standard Fmoc-based SPPS protocols, facilitating precise integration into synthetic peptides and proteins.
Peptide Synthesis: As an Fmoc-protected amino acid, n-Fmoc-6-methyl-l-tryptophan is widely used in the stepwise assembly of custom peptides via solid-phase peptide synthesis. The Fmoc group provides temporary N-terminal protection, allowing for selective deprotection and sequential coupling cycles without side reactions. The 6-methyl modification on the indole ring can be strategically introduced to impart specific steric hindrance, alter electronic distribution, or influence peptide folding and stability. This enables the synthesis of peptides with non-natural residues, supporting the exploration of novel sequence motifs and structure-function relationships in peptide science.
Structure-Activity Relationship Studies: The incorporation of 6-methyl-l-tryptophan residues into peptides or small proteins offers a powerful approach for probing the impact of side-chain modifications on biological activity, receptor binding, or molecular recognition. By comparing analogs with and without the 6-methyl group, researchers can dissect the role of indole ring modifications in modulating hydrophobic interactions, π-π stacking, or electronic effects within protein-ligand interfaces. This application is particularly valuable in the rational design of peptide-based inhibitors, ligands, and molecular probes.
Peptide Functionalization and Labeling: The unique chemical environment provided by the 6-methyl group can serve as a handle for further functionalization or selective labeling strategies. For example, peptides containing this modified tryptophan can be used as substrates in site-specific modification reactions or as scaffolds for the introduction of fluorescent, affinity, or photo-reactive tags. Such approaches enable the creation of specialized peptide conjugates for use in biochemical assays, imaging applications, or affinity purification protocols.
Biophysical and Folding Studies: The presence of a bulky methyl group at the 6-position of the indole ring can influence the conformational preferences of peptides and proteins, affecting their secondary structure, folding kinetics, and aggregation behavior. By incorporating n-Fmoc-6-methyl-l-tryptophan into synthetic sequences, researchers can systematically investigate how steric and electronic perturbations at the tryptophan side chain impact the overall biophysical properties of the molecule. These studies contribute valuable insights into protein engineering, folding mechanisms, and the design of stable peptide scaffolds.
Analytical Method Development: Modified amino acids such as 6-methyl-l-tryptophan can serve as useful standards or probes in analytical chemistry, particularly for the development and validation of chromatographic or mass spectrometric methods. Their distinct physicochemical properties, including altered retention times and fragmentation patterns, enable the optimization of detection protocols for non-canonical residues in complex peptide mixtures. This facilitates more accurate identification, quantification, and characterization of synthetic or naturally occurring peptides containing modified tryptophan analogs.
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