H-Arg-4MbetaNA is an arginine-derived amino acid derivative in which the side-chain guanidinium functionality is retained while the α-amino and α-carboxyl groups are present as a free amino acid (H- and -COOH) framework, and the side chain bears a 4MβNA-modified substituent. The molecule contains an unprotected guanidinium group capable of strong hydrogen bonding and ionic interactions, along with a free α-amino group and a carboxylic acid that can be protonated/deprotonated depending on pH, with the "4MbetaNA" substitution defining the structural modification relative to native arginine. H-Arg-4MbetaNA is used in peptide chemistry and chemical biology workflows where modified arginine analogues provide a functional handle for structure-activity studies, substrate analog design, or analytical labeling approaches that require an arginine-like cationic side chain paired with a defined substituent at the β-position.
H-Arg-4MbetaNA is an arginine-based amino acid derivative in which the alpha-amino group is present as a free N-terminus (H-) while the side chain retains the guanidinium functionality characteristic of L-arginine, and the side-chain is further substituted with a 4MbetaNA motif. The molecule therefore combines a stereochemically defined arginine backbone with a strongly basic guanidinium group that can engage in ionic and hydrogen-bonding interactions, alongside a functionalized substituent that can participate in derivatization or serve as a recognition handle in downstream chemistry. The presence of an unprotected guanidinium-bearing side chain typically dictates salt formation behavior and influences solubility, while the N-terminal amino group supports peptide coupling and amide-bond formation under standard protected-amino-acid strategies. As a chiral amino acid derivative, H-Arg-4MbetaNA functions as a research-grade intermediate for constructing arginine-containing motifs, enabling side-chain functionalization and controlled incorporation into peptide-like structures or conjugates.
1. Peptide Synthesis
H-Arg-4MbetaNA supports peptide synthesis workflows where an arginine-containing residue is required with a functionalized side-chain substituent for later elaboration. The free N-terminus and the guanidinium-bearing side chain enable coupling chemistries that preserve stereochemical integrity at the alpha-carbon while maintaining the side-chain's ability to direct solubility and binding during assembly. Side-chain substitution with the 4MbetaNA motif can be carried through as a protected or reactive handle depending on the chosen coupling and post-coupling transformation sequence, allowing targeted C-terminal or internal residue incorporation. The resulting arginine-containing peptide building block can be used to generate peptide analogs for biochemical probing and to prepare defined intermediates for further functional group conversion in synthetic organic chemistry.
2. Chemical Biology Probes
H-Arg-4MbetaNA is suitable for chemical biology applications that require arginine-like electrostatics combined with a side-chain tag for detection or specific molecular recognition. The guanidinium group can participate in strong salt-bridge interactions and can be used to mimic native arginine contributions in receptor or nucleic-acid binding contexts, while the 4MbetaNA substituent provides an additional chemical handle for conjugation, labeling, or affinity-based capture. The N-terminal amino functionality enables attachment to carriers, linkers, or scaffold-forming units, supporting construction of cell-permeable or target-engaging probe architectures when paired with appropriate protecting-group strategies. Downstream derivatives prepared from H-Arg-4MbetaNA can serve as molecular probes to interrogate binding modes, evaluate interaction specificity, and generate chemically defined reagents for mechanistic studies.
3. Bioconjugation Chemistry
H-Arg-4MbetaNA can be applied in bioconjugation chemistry where arginine guanidinium chemistry supports robust conjugate design and the 4MbetaNA motif enables controlled attachment to biomolecular targets. The free amino group at the N-terminus can be converted into amide, carbamate, or other coupling-compatible derivatives, while the guanidinium side chain helps maintain aqueous compatibility and can influence conjugate behavior through ionic interactions. Side-chain functionalization provides a route to install conjugation-ready groups or to introduce a stable recognition element that can be retained during conjugation and subsequent purification. Bioconjugates derived from this arginine-based intermediate can be used to generate labeled biomolecules, affinity reagents, and standardized research materials for studying biomolecular interactions and for supporting analytical workflows.
4. Side-Chain Functionalization
H-Arg-4MbetaNA functions as a chiral platform for side-chain functionalization strategies that leverage the arginine guanidinium group as a persistent stereochemical and electrostatic element. The 4MbetaNA substituent can be carried through synthetic sequences as a modifiable handle, enabling downstream transformations such as derivatization to alter polarity, introduce new reactive sites, or tune conjugation properties without changing the core arginine identity. The N-terminal amino group supports orthogonal protection and selective coupling approaches, allowing the synthesis of libraries of arginine analogs with controlled substitution patterns. The resulting functionalized arginine derivatives can serve as intermediates for peptidomimetic construction, structure-activity relationship studies, and process chemistry routes that require reproducible chiral building blocks.
5. Pharmaceutical Intermediate Preparation
H-Arg-4MbetaNA is applicable to pharmaceutical intermediate preparation where defined arginine-containing fragments are needed for synthesis of peptide-like drug candidates, peptidomimetics, or linker components. The stereochemically defined alpha-amino acid framework and the guanidinium side chain provide a chemically recognizable motif that can be incorporated into larger assemblies via amide-bond formation while maintaining the side-chain's interaction profile. The 4MbetaNA substituent can serve as a controlled functional group element for later diversification, enabling manufacturing-oriented route design that separates coupling, purification, and final functional group installation into discrete stages. Downstream products derived from H-Arg-4MbetaNA can be used as intermediates for fine chemical synthesis, supporting scalable preparation of chiral amino acid derivatives and structured building blocks for medicinal chemistry programs.
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