GHK-Cu2+ is the copper(II) complex of glycyl-L-histidyl-L-lysine (GHK). Unlike a conventional short peptide defined only by its amino-acid sequence, GHK-Cu combines a tripeptide ligand with coordinated Cu(II), making molecular identity dependent on both peptide chemistry and metal coordination.
This distinction makes GHK-Cu a useful research molecule at the intersection of metallopeptide chemistry, extracellular-matrix biology, fibroblast responses, copper handling, and formulation science.
Product Information
| Property | Specification |
|---|---|
| Product Name | GHK-Cu2+ |
| Catalog No. | AS2523 |
| Peptide Sequence | Gly-His-Lys |
| Short Form | GHK-Cu |
| Peptide Length | 3 amino acids |
| Metal Ion | Cu(II) |
| Molecular Class | Copper-binding metallopeptide |
| Purity | Crude to 98% |
| Research Areas | Peptide–metal coordination, ECM remodeling, fibroblast biology, copper peptide research |
GHK and Copper Coordination
The peptide ligand is:
Gly-His-Ly
GHK has a strong capacity to coordinate Cu(II). In the commonly studied complex, copper interacts with donor atoms provided by the peptide, including the N-terminal region and histidine-containing coordination environment.
It is important, however, not to represent GHK-Cu as a completely rigid structure under every experimental condition. Copper coordination can vary with pH, ligand-to-metal ratio, competing ligands, buffer composition, and other solution conditions.
For this reason, GHK-Cu is better understood as a defined metallopeptide system whose experimental behavior depends partly on its chemical environment.
GHK Versus GHK-Cu2+
GHK and GHK-Cu are related but chemically distinct research materials.
GHK refers to the peptide ligand without intentionally coordinated copper. GHK-Cu refers to the corresponding copper-containing complex. Published studies have shown that copper coordination can influence biological responses, making it inappropriate to assume that results obtained with apo-GHK apply directly to GHK-Cu.
We consider this distinction particularly important when laboratories compare peptide-only controls with copper-complexed material.
Researchers developing GHK analogs, modified copper-binding sequences, or related metallopeptides can explore our Custom Peptide Synthesis capabilities.
Extracellular Matrix Remodeling Research
GHK-Cu has been investigated in fibroblast and tissue-remodeling systems involving extracellular-matrix synthesis and turnover.
Research has examined responses associated with collagen-related pathways, matrix metalloproteinases, tissue inhibitors of metalloproteinases, cellular repair, and other processes involved in maintaining or remodeling connective tissue.
This makes the compound useful not only in skin-related studies but also as a model for understanding how metal coordination can modify the biological behavior of a short peptide ligand.
Why Solution Conditions Matter
The term GHK-Cu is often treated as though it represents one invariant species. In practice, metallopeptide chemistry is more condition-dependent.
Changes in pH or the presence of strong copper-binding substances can shift the coordination environment. Buffers, chelators, proteins, and other ligands in an assay may compete for Cu(II) or influence the distribution of copper-containing species.
Researchers should therefore record the reconstitution medium and final assay composition when interpreting experiments involving GHK-Cu.
For sensitive studies, the distinction between total peptide, coordinated copper, and potentially unbound copper may become analytically relevant.
Research Applications
GHK-Cu2+ can be used in studies involving peptide–metal coordination, extracellular-matrix remodeling, fibroblast biology, metallopeptide chemistry, cellular repair pathways, copper-dependent signaling, and formulation-dependent peptide behavior.
The small Gly-His-Lys ligand also provides a practical scaffold for investigating how amino-acid substitutions or terminal modifications alter metal-binding properties.
Synthetic and Quality Control Considerations
GHK-Cu requires more careful interpretation than a conventional uncomplexed tripeptide because correct peptide synthesis alone does not fully define the final research material.
Routine analytical HPLC can evaluate chromatographic purity, while mass spectrometry supports confirmation of peptide-related molecular identity. For studies where copper loading or coordination state is critical, additional project-specific analytical requirements may need to be defined separately.
Our Peptide Quality Control capabilities include HPLC, mass spectrometry, solubility testing, and applicable batch documentation according to the selected specification.
We recommend discussing metal-sensitive analytical requirements before ordering when the experiment depends directly on quantitative copper chemistry.
Purity and Experimental Planning
The appropriate peptide specification depends on the intended assay.
Exploratory chemistry, formulation studies, fibroblast experiments, and quantitative biological assays may require different levels of chromatographic purity and documentation. Buffer selection can be particularly important when the downstream system contains metal-binding components.
Researchers can refer to our Recommended Peptide Purity guidance when planning the required specification.
For GHK-Cu research, We recommend confirming the GHK sequence, copper-containing molecular form, purity specification, reconstitution conditions, and assay environment before comparative experiments are scheduled.
Frequently Asked Questions
What is GHK-Cu2+?
GHK-Cu2+ is a copper-containing complex formed from the tripeptide Gly-His-Lys (GHK) and Cu(II). It is studied as a metallopeptide in matrix biology, fibroblast research, copper coordination, and related experimental systems.
What is the difference between GHK and GHK-Cu?
GHK is the peptide ligand Gly-His-Lys. GHK-Cu contains coordinated copper. Because metal binding changes the chemical environment of the peptide, the two should be treated as distinct experimental materials.
Is copper covalently attached to GHK?
No. Copper is held through coordination interactions with donor atoms in the peptide rather than through a conventional covalent peptide modification.
Why do pH and buffer composition matter for GHK-Cu?
Copper coordination is sensitive to the surrounding chemical environment. pH, competing ligands, chelators, proteins, and buffer components can influence copper binding and speciation.
Is HPLC purity alone sufficient to characterize GHK-Cu?
HPLC is useful for assessing chromatographic purity, but a high HPLC percentage does not by itself describe every aspect of metallopeptide chemistry. Studies that depend specifically on copper content or coordination may require additional analytical planning.
Can GHK analogs or related copper-binding peptides be synthesized?
Yes. Sequence variants, terminal modifications, purity specifications, quantities, and related peptide designs can be evaluated according to the research objective.
Research Use Only.