Membrane Binding Strongly Affecting the Dopamine Reactivity Induced by Copper Prion and Copper/Amyloid-beta (Abeta) Peptides. A Ternary Copper/Abeta/Prion Peptide Complex Stabilized and Solubilized in Sodium Dodecyl Sulfate Micelles
Membrane Binding Strongly Affecting the Dopamine Reactivity Induced by Copper Prion and Copper/Amyloid-beta (Abeta) Peptides. A Ternary Copper/Abeta/Prion Peptide Complex Stabilized and Solubilized in Sodium Dodecyl Sulfate Micelles(71 visite) Bacchella C, Nicolis S, Dell'Acqua S, Rizzarelli E, Monzani E, Casella L
Inorg Chem (ISSN: 0020-1669linking, 1520-510x), 2020 Jan 6; 59(1): 900-912.
Tipo di articolo: Journal Article
Impact factor: 2.712, Impact factor a 5 anni: 4.661
*** IBB - CNR *** Dipartimento di Chimica , Universita di Pavia , Via Taramelli 12 , 27100 Pavia , Italy. Istituto di Biostrutture e Bioimmagini , Consiglio Nazionale delle Ricerche , Via P. Gaifami 18 , 95125 Catania , Italy.
The combination between dyshomeostatic levels of catecholamine neurotransmitters and redox-active metals such as copper and iron exacerbates the oxidative stress condition that typically affects neurodegenerative diseases. We report a comparative study of the oxidative reactivity of copper complexes with amyloid-beta (Abeta40) and the prion peptide fragment 76-114 (PrP76-114), containing the high-affinity binding site, toward dopamine and 4-methylcatechol, in aqueous buffer and in sodium dodecyl sulfate micelles, as a model membrane environment. The competitive oxidative and covalent modifications undergone by the peptides were also evaluated. The high binding affinity of Cu/peptide to micelles and lipid membranes leads to a strong reduction (Abeta40) and quenching (PrP76-114) of the oxidative efficiency of the binary complexes and to a stabilization and redox silencing of the ternary complex Cu(II)/Abeta40/PrP76-114, which is highly reactive in solution. The results improve our understanding of the pathological and protective effects associated with these complexes, depending on the physiological environment.
168 Records (160 escludendo Abstract e Conferenze). Impact factor totale: 669.261 (640.821 escludendo Abstract e Conferenze). Impact factor a 5 anni totale: 679.825 (649.267 escludendo Abstract e Conferenze).