Differential effects of Cu2+ and Fe3+ ions on in vitro amyloid formation of biologically-relevant α-synuclein variants
Artikel i vetenskaplig tidskrift, 2020

Alterations in metal ion homeostasis appear coupled to neurodegenerative disorders but mechanisms are unknown. Amyloid formation of the protein α-synuclein in brain cells is a hallmark of Parkinson’s disease. α-Synuclein can bind several metal ions in vitro and such interactions may affect the assembly process. Here we used biophysical methods to study the effects of micromolar concentrations of Cu2+ and Fe3+ ions on amyloid formation of selected α-synuclein variants (wild-type and A53T α-synuclein, in normal and N-terminally acetylated forms). As shown previously, Cu2+ speeds up aggregation of normal wild-type α-synuclein, but not the acetylated form. However, Cu2+ has a minimal effect on (the faster) aggregation of normal A53T α-synuclein, despite that Cu2+ binds to this variant. Like Cu2+, Fe3+ speeds up aggregation of non-acetylated wild-type α-synuclein, but with acetylation, Fe3+ instead slows down aggregation. In contrast, for A53T α-synuclein, regardless of acetylation, Fe3+ slows down aggregation with the effect being most dramatic for acetylated A53T α-synuclein. The results presented here suggest a correlation between metal-ion modulation effect and intrinsic aggregation speed of the various α-synuclein variants.

Amyloid formation

Metal ions

Parkinson’s disease

Acetylation

Thioflavin T

α-Synuclein

Författare

Emma Lorentzon

Göteborgs universitet

Ranjeet Kumar

Chalmers, Biologi och bioteknik, Kemisk biologi

Istvan Horvath

Chalmers, Biologi och bioteknik, Kemisk biologi

Pernilla Wittung Stafshede

Chalmers, Biologi och bioteknik, Kemisk biologi

Biometals

0966-0844 (ISSN) 1572-8773 (eISSN)

Vol. In Press

Ämneskategorier

Neurovetenskaper

Biofysik

Medicinsk bioteknologi (med inriktning mot cellbiologi (inklusive stamcellsbiologi), molekylärbiologi, mikrobiologi, biokemi eller biofarmaci)

DOI

10.1007/s10534-020-00234-4

Mer information

Senast uppdaterat

2020-04-22