H-Arg(Me)-OH

H-Arg(Me)-OH is an arginine-derived amino acid monomer in which the side-chain guanidinium functionality is retained while the α-amino group is presented as a free amino acid and the molecule bears a chiral, stereodefined α-carbon consistent with arginine chemistry. The structure features a carboxylic acid for C-terminal handling, a primary amino group for coupling and derivatization, and a substituted guanidinium motif that is strongly basic and can participate in salt formation, hydrogen bonding, and ionic recognition. The N-methylated arginine variant implied by the "Me" substituent modulates guanidinium basicity and steric profile relative to unmodified arginine, which can influence peptide coupling behavior and subsequent deprotection or functional-group compatibility. As a polar, water-interacting amino acid, H-Arg(Me)-OH functions as a chiral synthetic intermediate and a peptide-relevant building block for incorporating methylated arginine residues into larger amino acid derivatives and peptide analogs.

1. Peptide Synthesis

H-Arg(Me)-OH serves as a peptide building block for solid-phase or solution-phase peptide synthesis where arginine-like side-chain recognition and guanidinium-mediated interactions are required. The free α-amino and carboxylic acid groups enable standard peptide coupling strategies after appropriate temporary protection of the amino and guanidinium functionalities, allowing controlled formation of amide bonds at the α-position. The substituted guanidinium environment can be used to tune ionic character and steric demand in peptide sequences, supporting studies of how methylation affects conformational preferences and side-chain accessibility. Downstream, incorporation into peptide fragments can generate methylated-arginine-containing peptides for structure-activity relationship work and peptide material research.

2. Chemical Biology

H-Arg(Me)-OH is applicable to chemical biology workflows that require arginine-analog residues for probing protein recognition, binding-site electrostatics, and post-translational modification mimics. The guanidinium-bearing side chain, together with the amino acid backbone, supports conjugation-ready intermediate formation after conversion to protected derivatives for selective functionalization. The N-methylated guanidinium character can influence interaction strength with anionic partners and can be leveraged in molecular probes designed to interrogate arginine-dependent recognition pathways. Resulting conjugates and peptide mimics can be used as biochemical research intermediates for pathway mapping and receptor-ligand binding studies in a non-therapeutic, assay-focused context.

3. Bioconjugation Chemistry

H-Arg(Me)-OH can be employed in bioconjugation chemistry to introduce methylated-arginine motifs into linkers, affinity tags, and biomolecule-modifying reagents. The amino acid framework provides a handle for constructing amide-linked attachment points to carrier proteins, polymers, or labeling scaffolds once the reactive α-amino and carboxyl groups are managed through protection or activation. The guanidinium group supports electrostatic association and can improve solubility or binding to negatively charged surfaces, which is relevant for designing stable conjugates and purification-compatible intermediates. Downstream derivatization can yield labeled or functionalized amino acid derivatives used in analytical research, affinity capture, and biomolecule labeling schemes.

4. Protected Amino Acids

H-Arg(Me)-OH is suitable for conversion into protected amino acid derivatives used as chiral building blocks in protected amino acid synthesis and peptide coupling chemistry. The presence of both a free α-amino group and a carboxylic acid allows systematic protection-group planning, including temporary masking of the amino functionality and guanidinium protection to control chemoselectivity during peptide assembly. The methyl-substituted guanidinium environment can guide selection of protecting groups and deprotection conditions so that side-chain integrity is preserved through coupling cycles. Resulting protected forms function as process-ready intermediates for manufacturing peptide fragments, peptidomimetics, and other amino acid-derived fine chemicals.

5. Chiral Amino Acid Intermediate

H-Arg(Me)-OH functions as a chiral amino acid intermediate for stereoselective synthetic routes that require an arginine-like stereocenter and a methylated guanidinium side chain. The defined α-stereochemistry supports downstream construction of stereochemically consistent peptide analogs and amino acid derivatives used in SAR studies and fragment-based molecular design. The polar, ionic guanidinium motif can be carried through multi-step synthesis as a functional handle for salt formation, selective activation, and controlled incorporation into larger scaffolds. Broader relevance includes its use in industrial chemical manufacturing of amino acid-based intermediates where reproducible stereochemical identity and functional-group compatibility are required for consistent downstream transformations.

6. Analytical Research Standards

H-Arg(Me)-OH can be utilized to prepare analytical standards and reference compounds for method development in amino acid profiling, peptide mapping, and derivatization-based quantitation. The methylated arginine structure provides a chemically distinct target from canonical arginine, enabling separation and identification of methylated residues in complex mixtures when paired with appropriate detection workflows. The combination of carboxylic acid and amino functionality supports formation of derivatized standards that reflect the chemical behavior of methylated arginine during sample preparation. Downstream, the compound can serve as a biochemical research intermediate for validating analytical selectivity, monitoring synthetic incorporation of methylated residues, and supporting quality control of peptide-building processes.

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