The effect of osmolytes on protein fibrillation

Francesca Macchi, Maike Eisenkolb, Hans Kiefer, Daniel Otzen

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Abstract

Osmolytes are small molecules that are exploited by cells as a protective system against stress conditions. They favour compact protein states which makes them stabilize globular proteins in vitro and promote folding. Conversely, this preference for compact states promotes aggregation of unstructured proteins. Here we combine a brief review of the effect of osmolytes on protein fibrillation with a report of the effect of osmolytes on the unstructured peptide hormone glucagon. Our results show that osmolytes either accelerate the fibrillation kinetics or leave them unaffected, with the exception of the osmolyte taurine. Furthermore, the osmolytes that affected the shape of the fibrillation time profile led to fibrils with different structure as revealed by CD. The structural changes induced by Pro, Ser and choline-O-sulfate could be due to specific osmolytes binding to the peptides, stabilizing an otherwise labile fibrillation intermediate.
OriginalsprogEngelsk
TidsskriftInternational Journal of Molecular Sciences (Online)
Vol/bind13
Nummer3
Sider (fra-til)3801-3819
Antal sider19
ISSN1661-6596
DOI
StatusUdgivet - 21 mar. 2012

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