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The hydrophobic effect characterises the thermodynamic signature of amyloid fibril growth

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  • Juami Hermine Mariama van Gils, Vrije Universiteit Amsterdam
  • ,
  • Erik van Dijk, Vrije Universiteit Amsterdam
  • ,
  • Alessia Peduzzo, Heinrich Heine University Düsseldorf
  • ,
  • Alexander Hofmann, Heinrich Heine University Düsseldorf
  • ,
  • Nicola Vettore, Heinrich Heine University Düsseldorf
  • ,
  • Marie P Schützmann, Heinrich Heine University Düsseldorf
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  • Georg Groth, Heinrich Heine University Düsseldorf
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  • Halima Mouhib, Universite Paris-Est
  • ,
  • Daniel E Otzen
  • Alexander K Buell, Heinrich Heine University Düsseldorf, Technical University of Denmark
  • ,
  • Sanne Abeln, Vrije Universiteit Amsterdam

Many proteins have the potential to aggregate into amyloid fibrils, protein polymers associated with a wide range of human disorders such as Alzheimer's and Parkinson's disease. The thermodynamic stability of amyloid fibrils, in contrast to that of folded proteins, is not well understood: the balance between entropic and enthalpic terms, including the chain entropy and the hydrophobic effect, are poorly characterised. Using a combination of theory, in vitro experiments, simulations of a coarse-grained protein model and meta-data analysis, we delineate the enthalpic and entropic contributions that dominate amyloid fibril elongation. Our prediction of a characteristic temperature-dependent enthalpic signature is confirmed by the performed calorimetric experiments and a meta-analysis over published data. From these results we are able to define the necessary conditions to observe cold denaturation of amyloid fibrils. Overall, we show that amyloid fibril elongation is associated with a negative heat capacity, the magnitude of which correlates closely with the hydrophobic surface area that is buried upon fibril formation, highlighting the importance of hydrophobicity for fibril stability.

Original languageEnglish
Article numbere1007767
JournalPLOS Computational Biology
Publication statusPublished - May 2020

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