期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 20, 页码 -出版社
MDPI
DOI: 10.3390/ijms21207671
关键词
dissolution kinetics; self-assembly; peptides
资金
- Knut and Alice Wallenberg foundation [KAW.2014.0052]
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 beta-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.
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