Can chicken and human PrPs possess SOD-like activity after beta-cleavage?
The prion protein is a membrane attached glycoprotein that is involved in binding of divalent copper ions. In vivo human and chicken PrPs exhibit SOD-like activity associated with octarepeat and hexarepeat regions, respectively, when bind Cu(II) ions. However, the species of Cu(II)-PrP involved in the Cu(II) center which determines the highest SOD-like activity is still unknown. The data presented here clearly show that the single Cu(II) ion bound to PrP octapeptide repeat region of mammalian prion and hexapeptide repeat region of avian prion via 4 His side-chain imidazoles reveals the highest SOD activity.
Stańczak
Pawel
P
Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50383 Wroclaw, Poland.
Kozlowski
Henryk
H
D000818:Animals; D002645:Chickens; D003300:Copper / Q000378:metabolism; D006801:Humans; D020128:Inhibitory Concentration 50; D010446:Peptide Fragments / Q000378:metabolism; D011328:Prions / Q000378:metabolism*; D013482:Superoxide Dismutase / Q000378:metabolism*
D010446:Peptide Fragments; D011328:Prions; D003300:Copper; D013482:Superoxide Dismutase