Slow dissolution kinetics of model peptide fibrils

Mona Koder Hamid, Axel Rüter, Stefan Kuczera, Ulf Olsson

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)

Abstract

Understanding the kinetics of peptide self-assembly is important because of the involvement of peptide amyloid fibrils in several neurodegenerative diseases. In this paper, we have studied the dissolution kinetics of self-assembled model peptide fibrils after a dilution quench. Due to the low concentrations involved, the experimental method of choice was isothermal titration calorimetry (ITC). We show that the dissolution is a strikingly slow and reaction-limited process, that can be timescale separated from other rapid processes associated with dilution in the ITC experiment. We argue that the rate-limiting step of dissolution involves the breaking up of inter-peptide β–sheet hydrogen bonds, replacing them with peptide–water hydrogen bonds. Complementary pH experiments revealed that the self-assembly involves partial deprotonation of the peptide molecules.

Original languageEnglish
Article number7671
Number of pages9
JournalInternational Journal of Molecular Sciences
Volume21
Issue number20
DOIs
Publication statusPublished - 2020 Oct

Subject classification (UKÄ)

  • Physical Chemistry

Keywords

  • Dissolution kinetics
  • Peptides
  • Self-assembly

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