Boc-Dap(Dnp)-OSu is a Boc-protected amino acid derivative in which the side chain corresponds to 2,3-diaminopropanoic acid bearing a 2,4-dinitrophenyl (Dnp) substituent and the carboxyl functionality is converted to an N-hydroxysuccinimide (OSu) ester. The molecule contains a carbamate-protected α-amino group (Boc), an activated OSu ester for acyl transfer, and a Dnp-bearing side chain with additional amino functionality, with stereochemistry not specified in the provided name. In synthesis and chemical biology workflows, this OSu ester form is used as an activated amino-acid building block to form amide-linked conjugates or to incorporate the Dnp-modified amino acid motif into peptide and bioconjugation targets under conditions compatible with carboxyl activation chemistry.
Boc-Dap(Dnp)-OSu is a Boc-protected amino acid derivative bearing a 2,4-dinitrophenyl (Dnp) group on the side chain and an N-hydroxysuccinimide (OSu) ester functionality on the activated carboxylate. This combination makes it a widely used electrophilic building block for preparing Dnp-tagged lysine/diaminopropionate analogs and for forming amide or related linkages under standard peptide-coupling conditions. In practice, the Dnp motif supports immunochemical and analytical workflows that rely on dinitrophenyl hapten chemistry, while the OSu ester enables efficient downstream conjugation to amine-containing partners.
1. Dnp-Tagged Conjugation
Boc-Dap(Dnp)-OSu is used to generate Dnp-functionalized conjugates for chemical biology and assay development, where the Dnp group serves as a well-established hapten for antibody recognition and detection formats. Researchers commonly employ this activated derivative to couple the Dnp-bearing amino acid moiety to lysine-containing peptides, protein carriers, or amine-functional surfaces, enabling controlled presentation of the hapten density in immunoassay reagents and binding studies. The OSu ester provides a practical activation handle for coupling to amines, while the Boc protection supports handling and selective deprotection strategies during conjugate assembly.
2. Peptide and Amide Coupling
Boc-Dap(Dnp)-OSu is a convenient activated amino acid building block for incorporating a Dnp-bearing diamino acid unit into peptide segments or for synthesizing Dnp-containing amide derivatives used in structure-reactivity studies. Peptide chemistry teams use OSu-activated amino acid derivatives to streamline formation of amide bonds with compatible amine nucleophiles, including side-chain amines on peptides and primary amines on scaffolds. The Boc group helps maintain the amino functionality in a protected state during coupling and intermediate handling, supporting workflows where the Dnp-tag must remain intact for downstream analytical readouts.
3. Immunoassay Hapten Standards
Boc-Dap(Dnp)-OSu is also used as a reagent precursor for preparing Dnp-based standards and calibration materials for analytical methods that quantify Dnp-hapten interactions. In laboratories developing immunochemical assays, the Dnp moiety is leveraged to create defined antigen-like structures or hapten analogs that can be used to validate assay performance and compare binding responses across reagent batches. The activated OSu ester form supports reproducible construction of amide-linked Dnp conjugates, which is particularly valuable when preparing reference materials where consistent coupling chemistry and hapten presentation are required.
4. Protein Labeling Reagents
Boc-Dap(Dnp)-OSu can serve as an intermediate for constructing Dnp-labeled protein conjugates used in protein interaction mapping and binding assays. Bioconjugation workflows often require an electrophilic, amine-reactive activated carboxylate to attach a defined Dnp-bearing amino acid unit to proteins or protein fragments containing accessible primary amines. By using Boc-Dap(Dnp)-OSu as the Dnp-bearing coupling component, researchers can build conjugates with controlled chemical identity, enabling consistent use of Dnp readouts in downstream immunochemical detection or competitive binding experiments.
1. SERS spectrum of the peptide thymosin‐β4 obtained with Ag nanorod substrate
4. Cationic cell-penetrating peptides are potent furin inhibitors
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