How it works: the copper-carrier model
The copper-carrier model says GHK-Cu’s core trick is logistics: binding copper tightly enough to keep it quiet,…
Delivering copper to the enzymes that build and protect tissue
The copper-carrier model says GHK-Cu’s core trick is logistics: binding copper tightly enough to keep it quiet, loosely enough to hand it off where a cell needs it. Roughly a dozen enzymes cannot work without copper, so a precise copper shuttle would touch many processes at once. Would is the operative word, and this unit spends its time on the gap between that model and what has actually been measured.
This unit walks the copper-carrier model end to end, from the cuproenzyme family that depends on the metal, through the capture-transport-handoff route, to why a carrier beats simply swallowing more copper.
Key terms
The copper-dependent enzymes
Copper is an essential cofactor for roughly a dozen enzymes, each of which binds it at a specific site. When copper runs low, they falter together, because they share the same metal. That shared dependence is the reason a molecule that delivers copper precisely could in principle ripple across many processes at once. Note the word could: this page is copper biochemistry, drawn from copper reviews, not from any study of GHK-Cu.
The catch is that the copper these enzymes need is also dangerous when it floats loose: free cuprous ions react readily with hydrogen peroxide to yield the deleterious hydroxyl radical. So the body never leaves copper lying around. Copper homeostasis is regulated very tightly, and unbound copper is kept extremely low in concentration: copper imported by the membrane transporter Ctr1 is taken on at once by chaperone proteins, which hand the metal along named routes. GHK-Cu is proposed as a small, mobile member of that logistics system. No source read for this course places it on any of those routes.
Copper deficiency can impair several enzymes at once, since they share the cofactor. Its most frequent clinical manifestations are anemia, neutropenia and bone abnormalities.