Protein array based interactome analysis of amyloid-β indicates an inhibition of protein translation.

Abstract:

:Oligomeric amyloid-β is currently of interest in amyloid-β mediated toxicity and the pathogenesis of Alzheimer's disease. Mapping the amyloid-β interaction partners could help to discover novel pathways in disease pathogenesis. To discover the amyloid-β interaction partners, we applied a protein array with more than 8100 unique recombinantly expressed human proteins. We identified 324 proteins as potential interactors of oligomeric amyloid-β. The Gene Ontology functional analysis of these proteins showed that oligomeric amyloid-β bound to multiple proteins with diverse functions both from extra and intracellular localizations. This undiscriminating binding phenotype indicates that multiple protein interactions mediate the toxicity of the oligomeric amyloid-β. The most highly impacted cellular system was the protein translation machinery. Oligomeric amyloid-β could bind to altogether 24 proteins involved in translation initiation and elongation. The binding of amyloid-β to purified rat hippocampal ribosomes validated the protein array results. More importantly, in vitro translation assays showed that the oligomeric amyloid-β had a concentration dependent inhibitory activity on translation. Our results indicate that the inhibited protein synthesis is one of the pathways that can be involved in the amyloid-beta induced neurotoxicity.

journal_name

J Proteome Res

authors

Virok DP,Simon D,Bozsó Z,Rajkó R,Datki Z,Bálint É,Szegedi V,Janáky T,Penke B,Fülöp L

doi

10.1021/pr1009096

subject

Has Abstract

pub_date

2011-04-01 00:00:00

pages

1538-47

issue

4

eissn

1535-3893

issn

1535-3907

journal_volume

10

pub_type

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