Fmoc-Asp(EDANS)-OH

Fmoc-Asp(EDANS)-OH is an Fmoc-protected aspartic acid derivative bearing an EDANS fluorophore on the side chain, combining an amino acid backbone with a covalently appended dansyl-like reporter for spectroscopic readout. The molecule contains an Fmoc carbamate on the alpha-amino group, a free carboxylic acid for C-terminal compatibility, and a side-chain functionalization pattern consistent with Asp-derived peptide coupling after activation. The EDANS group introduces a conjugated aromatic system with strong fluorescence and environment-dependent emission, enabling monitoring of local polarity, proximity, and conformational changes in peptide or protein contexts. The stereochemistry at the alpha-carbon is fixed as the natural L-aspartate configuration, supporting stereochemically consistent peptide bond formation and downstream use in protected amino acid synthesis and fragment assembly.

1. Fluorescent Peptide Synthesis

Fmoc-Asp(EDANS)-OH supports fluorescent peptide building block preparation for solid-phase peptide synthesis workflows where side-chain labeling is required without post-coupling dye attachment. The Fmoc-protected alpha-amine enables standard peptide coupling after deprotection, while the free side-chain carboxyl functionality is already embedded in the EDANS-bearing aspartate motif, reducing the need for late-stage functionalization. The EDANS fluorophore participates as a stable, conjugated reporter that can be incorporated into peptide sequences to generate labeled analogs for binding studies, folding probes, and conformational assays. The resulting EDANS-containing peptides serve as traceable reagents for biochemical research intermediate formation and for constructing fluorescence-tagged libraries used in structure-function analysis.

2. Chemical Biology Labeling

Fmoc-Asp(EDANS)-OH is suitable for chemical biology and molecular recognition studies where a fluorogenic amino acid side chain enables site-specific monitoring of biomolecular interactions. The alpha-carboxylic acid and Fmoc carbamate arrangement allows incorporation into peptide constructs that can later be used as probes, substrates, or mimics in enzyme and binding assays. The EDANS moiety can undergo environment-sensitive fluorescence changes upon incorporation into different microenvironments, supporting readouts for proximity effects, solvent exposure, and conformational transitions. Downstream derivatization of the peptide scaffold can be applied to generate labeled biomolecule conjugates and to support mechanistic investigations using amino acid chemistry-compatible labeling strategies.

3. Protein Engineering Probes

Fmoc-Asp(EDANS)-OH can be employed in protein engineering contexts that rely on peptide fragments or chemically synthesized segments to introduce fluorescent reporters at Asp positions. The fixed L-aspartate stereocenter and preserved peptide-compatible functional groups facilitate stereochemically consistent incorporation into designed sequences, including peptides that act as surrogates for protein regions or as ligation partners. The EDANS fluorophore provides a spectroscopic handle for tracking local structural changes when the labeled segment is used in protein assembly, domain mapping, or hybrid construct generation. The compound thus functions as a chiral, peptide-ready amino acid derivative for constructing fluorescence-tagged molecular probes and for producing intermediate materials for applied protein science.

4. Peptidomimetic SAR Studies

Fmoc-Asp(EDANS)-OH enables peptidomimetic construction for structure-activity relationship studies where a fluorescent side-chain analog helps correlate sequence features with molecular recognition behavior. The Fmoc-protected amino group supports iterative fragment assembly, while the carboxylic acid supports conversion into amide or activated derivatives during synthesis of constrained analogs. The EDANS group functions as a built-in reporter that can be retained across analog series, supporting comparative analysis of binding environments and conformational preferences across analogs. The resulting labeled peptidomimetics can be used as SAR research intermediates to guide amino acid derivatization decisions and to support synthetic methodology development for reporter-bearing scaffolds.

5. Process Chemistry Intermediate

Fmoc-Asp(EDANS)-OH serves as a manufacturable chiral amino acid intermediate for fine chemical synthesis routes that require a protected, reporter-tagged Asp building block. The Fmoc carbamate provides a stable protection strategy for the alpha-amino group during coupling chemistry, while the presence of a free carboxylic acid supports downstream conversion to activated forms for peptide coupling or for controlled derivatization. The EDANS fluorophore is chemically integrated into the side-chain framework, enabling manufacturing of labeled intermediates without relying on separate dye conjugation steps that may introduce variability. The compound can be applied to scalable preparation of fluorescence-labeled peptide reagents and to industrial intermediate preparation where consistent incorporation of a defined chiral amino acid derivative is required for reproducible analytical and synthetic output.

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