The copper(II) ion is an essential structural component of GHK-Cu, forming a stable coordination complex through interactions with the Gly-His-Lys tripeptide. This metal-binding arrangement influences the physicochemical properties of the complex and has made GHK-Cu a widely studied model system for investigating copper coordination chemistry, ligand-metal interactions, metallopeptide stability, and copper-dependent signaling mechanisms.

Research involving GHK-Cu has examined interactions with signaling networks associated with extracellular matrix regulation, structural protein organization, metal-ion transport processes, and peptide-mediated cellular communication. Additional investigations have explored relationships between GHK-Cu and copper-dependent regulatory proteins, redox-associated signaling pathways, and metalloprotein activity, contributing to a broader understanding of metallopeptide signaling systems.

GHK-Cu combines a well-characterized tripeptide scaffold with high-affinity copper(II) coordination, resulting in a defined metallopeptide structure that has been extensively investigated in coordination chemistry and signaling research. Its established molecular architecture and documented metal-binding properties have made it a valuable reference compound for studies examining ligand-metal interactions, metallopeptide pharmacology, structure-function relationships, and copper-dependent regulatory mechanisms.