Issue 12, 2015

Methionine oxidation of amyloid peptides by peroxovanadium complexes: inhibition of fibril formation through a distinct mechanism

Abstract

Fibril formation of amyloid peptides is linked to a number of pathological states. The prion protein (PrP) and amyloid-β (Aβ) are two remarkable examples that are correlated with prion disorders and Alzheimer's disease, respectively. Metal complexes, such as those formed by platinum and ruthenium compounds, can act as inhibitors against peptide aggregation primarily through metal coordination. This study revealed the inhibitory effect of two peroxovanadium complexes, (NH4)[VO(O2)2(bipy)]·4H2O (1) and (NH4)[VO(O2)2(phen)]·2H2O (2), on amyloid fibril formation of PrP106–126 and Aβ1–42via site-specific oxidation of methionine residues, besides direct binding of the complexes with the peptides. Complexes 1 and 2 showed higher anti-amyloidogenic activity on PrP106–126 aggregation than on Aβ1–42, though their regulation on the cytotoxicity induced by the two peptides could not be differentiated. The action efficacy may be attributed to the different molecular structures of the vanadium complex and the peptide sequence. Results reflected that methionine oxidation may be a crucial action mode in inhibiting amyloid fibril formation. This study offers a possible application value for peroxovanadium complexes against amyloid proteins.

Graphical abstract: Methionine oxidation of amyloid peptides by peroxovanadium complexes: inhibition of fibril formation through a distinct mechanism

Supplementary files

Article information

Article type
Paper
Submitted
03 شعبان 1436
Accepted
15 ذو الحجة 1436
First published
15 ذو الحجة 1436

Metallomics, 2015,7, 1562-1572

Author version available

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