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Distinct stress conditions result in aggregation of proteins with similar properties.

Journal article
Authors Alan J Weids
Sebastian Ibstedt
Markus J. Tamás
Chris M Grant
Published in Scientific reports
Volume 6
Pages 24554
ISSN 2045-2322
Publication year 2016
Published at Department of Chemistry and Molecular Biology
Pages 24554
Language en
Links dx.doi.org/10.1038/srep24554
Subject categories Cell Biology, Microbiology, Bioinformatics and Systems Biology

Abstract

Protein aggregation is the abnormal association of proteins into larger aggregate structures which tend to be insoluble. This occurs during normal physiological conditions and in response to age or stress-induced protein misfolding and denaturation. In this present study we have defined the range of proteins that aggregate in yeast cells during normal growth and after exposure to stress conditions including an oxidative stress (hydrogen peroxide), a heavy metal stress (arsenite) and an amino acid analogue (azetidine-2-carboxylic acid). Our data indicate that these three stress conditions, which work by distinct mechanisms, promote the aggregation of similar types of proteins probably by lowering the threshold of protein aggregation. The proteins that aggregate during physiological conditions and stress share several features; however, stress conditions shift the criteria for protein aggregation propensity. This suggests that the proteins in aggregates are intrinsically aggregation-prone, rather than being proteins which are affected in a stress-specific manner. We additionally identified significant overlaps between stress aggregating yeast proteins and proteins that aggregate during ageing in yeast and C. elegans. We suggest that similar mechanisms may apply in disease- and non-disease settings and that the factors and components that control protein aggregation may be evolutionary conserved.

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