H-gamma-Carboxy-Glu-OH

H-gamma-Carboxy-Glu-OH is an L-glutamate-derived amino acid in which an additional carboxyl group is positioned at the gamma position relative to the alpha carbon, yielding a dicarboxylic side chain while retaining the canonical alpha-amino and alpha-carboxyl functionality. The molecule therefore presents two acidic carboxyl groups plus a primary amino group, enabling strong ionic interactions and pH-dependent speciation across aqueous media. As a polar, chiral amino acid with multiple hydrogen-bond acceptors and donors, it functions as a chemically defined intermediate for amino acid derivatization and for constructing peptide backbones that require an extra acidic handle. The presence of multiple carboxyl groups also makes it compatible with selective protection and controlled coupling strategies used in peptide chemistry and downstream functionalization.

1. Peptide Coupling Chemistry

H-gamma-Carboxy-Glu-OH supports peptide synthesis strategies where an additional side-chain carboxyl group must be carried through coupling steps without uncontrolled side reactions. The alpha-amino group participates in standard amide bond formation, while the dual carboxyl functionality enables orthogonally protected variants to be incorporated as a defined acidic residue analog. Selective protection of one carboxyl group and preservation of the other can be applied to C-terminal or side-chain-directed peptide assembly, allowing controlled deprotection to generate a reactive gamma-carboxyl handle for subsequent conjugation. Downstream, peptide building blocks derived from this scaffold can be used to generate acidic peptide sequences, charge-patterned analogs, and controlled ion-binding motifs in synthetic peptide libraries.

2. Protein Engineering Studies

H-gamma-Carboxy-Glu-OH is suitable for protein engineering and chemical biology workflows that require introducing an extra acidic moiety to tune local electrostatics and hydrogen-bonding patterns. The gamma-carboxyl group can be used as a structural element that mimics or perturbs native glutamate-like charge distribution when incorporated into engineered peptides or protein fragments. The amino acid's stereogenic center and defined functional group spacing can help researchers design sequence variants for probing binding-site microenvironments, electrostatic steering, and salt-bridge formation tendencies. The resulting engineered constructs or peptide intermediates can then serve as tools for mapping structure-function relationships in protein-like systems and for generating defined acidic motifs for biomolecular recognition studies.

3. Amino Acid Derivatization

H-gamma-Carboxy-Glu-OH can be employed in amino acid derivatization routes that target selective functional group transformation of the gamma-carboxyl group while maintaining the alpha-amino and alpha-carboxyl framework. The multi-carboxyl architecture enables chemoselective protection-deprotection logic, such as differentiating the alpha and gamma acids to control which site is activated for esterification, amidation, or coupling to linkers. Derivatives prepared from this intermediate can be used to generate functionalized amino acid building blocks for peptidomimetic construction, polymerizable monomers, or charged conjugation handles for biomolecule labeling. The compound's defined stereochemistry supports reproducible downstream synthesis of chiral, acidic intermediates used in fine chemical and research-grade manufacturing.

4. Bioconjugation Linkers

H-gamma-Carboxy-Glu-OH is compatible with bioconjugation chemistry where an anionic side-chain provides a defined distance and charge density for linker design. The gamma-carboxyl group can be converted to activated ester or amide-forming intermediates in a controlled manner, enabling attachment to amine-bearing biomolecules or to peptide scaffolds that carry complementary reactive groups. The alpha-amino functionality can also be protected to prevent cross-reactivity during conjugation, supporting orthogonal coupling workflows that separate linker installation from peptide assembly. Resulting conjugates can be applied in chemical biology experiments requiring stable, charge-defined biomolecule modifications and in synthetic workflows that demand predictable ionic interactions.

5. Analytical Reference Standards

H-gamma-Carboxy-Glu-OH can be used to develop analytical reference materials for amino acid profiling and method validation involving multi-carboxyl amino acids. The compound's distinct dicarboxylic side chain and primary amino group produce characteristic chromatographic and spectrometric signatures that can aid in confirming identity and monitoring derivatization efficiency in analytical research. Selective derivatization of one or both carboxyl groups can be applied to generate standardized derivatives for LC-MS or GC-based workflows, supporting robust quantification and impurity tracking. The chiral, highly polar nature of the scaffold makes it a useful benchmark for analytical studies focused on amino acid derivatization chemistry and method selectivity in complex matrices.

6. Process Chemistry Intermediate

H-gamma-Carboxy-Glu-OH serves as a process chemistry intermediate for manufacturing routes that require a well-defined acidic chiral amino acid building block with multiple functional handles. The presence of two carboxylic acids and one amino group enables planned protection strategies that can be integrated into scalable peptide building block preparation, including selective activation of a single carboxyl group for downstream coupling. The compound's ionic character and functional group density support reproducible handling in aqueous or mixed-solvent operations when protected derivatives are used to manage solubility and reactivity. Downstream, derivatives derived from this intermediate can feed into specialty chemical production, including fine chemical synthesis of charged linkers, peptidomimetic fragments, and amino acid-based materials that require controlled acidity and stereochemical definition.

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