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Dehydration stability of amyloid fibrils studied by AFM
journal contribution
posted on 2023-06-07, 20:11 authored by Gjertrud Maurstad, Marcus Prass, Louise SerpellLouise Serpell, Pawel SikorskiAtomic force microscopy was used to investigate the stability of dehydrated amyloid fibrils formed by human islet polypeptide (IAPP) and A beta(1-42) peptides. IAPP amyloid fibrils were imaged in liquid (hydrated state) and in air (dehydrated). In addition, fibrils dried on the mica surface were rehydrated and re-examined both in liquid and in air (after consecutive redrying). As reported previously, the initial drying process does not result in any major change in the amyloid appearance and the dimensions of the fibrils are preserved. However, when once-dried samples are rehydrated, fibril stability is lost. The fibrils disintegrate into small particles that are attached to the mica surface. This process is further confirmed by studies of the rehydrated samples after drying, on which the morphology of the fibrils is clearly changed. Similar behavior is observed for A beta(1-42) amyloid fibrils, which are apparently stable on first drying, but disintegrate on rehydration. The observed change indicates that dehydration is causing a change in the internal structure of the amyloid fibrils. This has important implications for studies of amyloid fibrils by other techniques. Due to the potential influence of hydration and sample history on amyloid structure, preparation and study of amyloid samples with controlled humidity requires more consideration.
History
Publication status
- Published
Journal
European Biophysics JournalISSN
0175-7571Publisher
Springer VerlagExternal DOI
Issue
8Volume
38Page range
1135-1140Department affiliated with
- Biochemistry Publications
Full text available
- No
Peer reviewed?
- Yes