L-Homopropargylglycine hydrochloride | CAS 942518-19-6

L-Homopropargylglycine hydrochloride is a propargylated amino acid building block designed for copper-free or copper-mediated click chemistry workflows, most commonly used as an alkyne handle in bioorthogonal conjugation strategies. As a homologue of propargylglycine, it provides a stable, amino acid-compatible scaffold that can be incorporated into peptides, linkers, and labeling reagents while retaining the reactive terminal alkyne for subsequent conjugation. This reagent is frequently selected in molecular imaging, chemical biology, and biomaterials research where controlled attachment of functional payloads to biomolecules or surfaces is required.

1. Peptide And Protein Labeling

L-Homopropargylglycine hydrochloride is widely used to introduce an alkyne functional group into peptides and protein-derived constructs, enabling downstream click conjugation to azide-bearing partners such as fluorophores, affinity tags, or biophysical probes. Researchers value the amino acid compatibility for site-specific or modular labeling strategies, including incorporation into synthetic peptide sequences and preparation of alkyne-containing labeling handles for protein modification workflows. In chemical biology and proteomics-adjacent tool development, this reagent supports generation of conjugatable biomolecular reagents used for tracking, pull-down chemistry, and multicomponent assembly of probe sets.

2. Biomaterials Surface Functionalization

L-Homopropargylglycine hydrochloride is commonly employed to functionalize polymeric materials and biomaterial surfaces with terminal alkyne groups that can be coupled to azide-functional coatings, linkers, or bioactive motifs via click chemistry. Materials scientists use alkyne-bearing amino acid linkers to create stable attachment points for subsequent grafting of imaging agents, cell-interaction ligands, or crosslinking components, facilitating modular surface engineering. The hydrochloride salt form also supports practical handling in aqueous or mixed solvent environments during reagent preparation for material modification protocols.

3. Molecular Imaging Probe Construction

L-Homopropargylglycine hydrochloride serves as a key intermediate for constructing imaging and detection reagents that require a robust click-ready alkyne handle. Probe developers incorporate this amino acid into labeling scaffolds so that, after conjugation to azide-functional dyes or reporter moieties, the resulting constructs can be assembled with defined stoichiometry and modularity. This approach is particularly useful when building families of structurally related probes for microscopy, fluorescence-based assays, or other optical detection platforms where consistent conjugation chemistry across multiple targets is advantageous.

4. Chemical Biology Linker Synthesis

L-Homopropargylglycine hydrochloride is frequently used to prepare alkyne-containing linkers and chemical handles for studying biomolecular interactions and cellular components in chemical biology workflows. By providing an amino acid-derived scaffold, it can be integrated into multifunctional reagent designs that later undergo click coupling to azide-functional affinity reagents, reporters, or enrichment handles. Tool developers rely on this reagent to streamline synthesis of reusable conjugation intermediates, supporting rapid variation of probe composition while maintaining a standardized click-compatible attachment point.