Formation equilibria of nickel complexes with glycyl-histidyl-lysine and two synthetic analogues.
Conato. Chiara C; Kozłowski. Henryk H; Swiatek-Kozłowska. Jolanta J; Młynarz. Piotr P; Remelli. Maurizio M; Silvestri. Sergio S
Key Findings
- Nickel forms several complex species with the natural GHK peptide, including a tetrameric form.
- The side‑chain amino group of the lysine residue does not participate in binding the metal.
- Synthetic analogues of GHK (with modified histidine) show different nickel‑binding behavior.
Practical Outcomes
- The findings are of academic interest only and do not provide actionable guidance for supplementation, dosing, or any health‑related protocol. Biohackers looking for ways to use GHK‑Cu or related peptides for longevity or performance will not gain useful information from this study.
Summary
This paper studies how nickel ions stick to a small protein fragment (GHK) and two similar lab-made versions. It’s a pure chemistry investigation and doesn’t tell you anything you can use for health, supplements, or performance.
Abstract
Complex-formation equilibria between the Ni(II) ion and the natural tripeptide glycyl-L-histidyl-L-lysine have been investigated. Two synthetic analogues, where the histidine residue has been substituted with L-4,5,6,7-tetrahydro-1H-imidazo[4,5-c]pyridine-6-carboxylic acid (L-Spinacine) and L-1,2,3,4-tetrahydro-isoquinolin-3-carboxylic acid (Tic), respectively, have been considered, as well. Different experimental techniques have been employed: potentiometry, calorimetry, visible spectrophotometry and CD spectroscopy. Structural hypotheses on the main complex species are suggested. Evidences on the formation of tetrameric species with the first ligand are shown. No involvement of the side-chain amino group of lysine residue in metal ion coordination was found.
Study Information
pubmed
2004
10.1016/j.jinorgbio.2003.09.010