Lysines, Achilles' heel in alpha-synuclein conversion to a deadly neuronal endotoxin.

Abstract:

:Alpha-synuclein aggregation is associated with Parkinson's disease and other neurodegenerative disorders termed synucleinopathies. The sequence of alpha-synuclein has a remarkable amount of lysines, which may be a target for modifications by several aldehydes found at increased concentration in parkinsonian brains. The involved aldehydes are the dopamine metabolite 3,4-dihydroxyphenylacetaldehyde, the lipid peroxidation products 4-hydroxynonenal, acrolein and malondialdehyde, and advanced glycation end-products. Moreover, both relative expression levels and enzymatic activity of aldehyde dehydrogenases, which are responsible for aldehydes detoxification in cells, are altered in Parkinson's disease brains. The effects of aldehyde modifications can include: (i) a perturbation in the equilibrium of cytosolic and membrane-bound alpha-synuclein, that may alter protein function and lead to aggregation; (ii) the reduction of alpha-synuclein ubiquitination and SUMOylation, affecting its cellular localization and clearance; (iii) a decreased susceptibility to cleavage at specific sites by extracellular proteases; (iv) a reduced availability of identified lysine acetylation sites; (v) the production of toxic oligomeric alpha-synuclein-aldehyde species, able to damage lipid membranes and transmissible from unhealthy to healthy neurons. All of these observations point to a complex interaction between alpha-synuclein and aldehydes in brain, which may lead to the accumulation of dysfunctional alpha-synuclein and its oligomerization.

journal_name

Ageing Res Rev

journal_title

Ageing research reviews

authors

Plotegher N,Bubacco L

doi

10.1016/j.arr.2015.12.002

subject

Has Abstract

pub_date

2016-03-01 00:00:00

pages

62-71

eissn

1568-1637

issn

1872-9649

pii

S1568-1637(15)30037-4

journal_volume

26

pub_type

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