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@ARTICLE{Schneider:829474,
author = {Schneider, Mario and Walta, Stefan and Cadek, Chris and
Richtering, Walter and Willbold, Dieter},
title = {{F}luorescence correlation spectroscopy reveals a
cooperative unfolding of monomeric amyloid-β 42 with a low
{G}ibbs free energy},
journal = {Scientific reports},
volume = {7},
issn = {2045-2322},
address = {London},
publisher = {Nature Publishing Group},
reportid = {FZJ-2017-03172},
pages = {2154},
year = {2017},
abstract = {The amyloid-beta peptide (Aβ) plays a major role in the
progression of Alzheimer’s disease. Due to its high
toxicity, the 42 amino acid long isoform Aβ42 has become of
considerable interest. The Aβ42 monomer is prone to
aggregation down to the nanomolar range which makes
conventional structural methods such as NMR or X-ray
crystallography infeasible. Conformational information,
however, will be helpful to understand the different
aggregation pathways reported in the literature and will
allow to identify potential conditions that favour
aggregation-incompetent conformations. In this study, we
applied fluorescence correlation spectroscopy (FCS) to
investigate the unfolding of Alexa Fluor 488 labelled
monomeric Aβ42 using guanidine hydrochloride as a
denaturant. We show that our Aβ42 pre-treatment and the
low-nanomolar concentrations, typically used for FCS
measurements, strongly favour the presence of monomers. Our
results reveal that there is an unfolding/folding behaviour
of monomeric Aβ42. The existence of a cooperative unfolding
curve suggests the presence of structural elements with a
Gibbs free energy of unfolding of about 2.8 kcal/mol.},
cin = {ICS-6},
ddc = {000},
cid = {I:(DE-Juel1)ICS-6-20110106},
pnm = {553 - Physical Basis of Diseases (POF3-553)},
pid = {G:(DE-HGF)POF3-553},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000401614900012},
pubmed = {pmid:28526839},
doi = {10.1038/s41598-017-02410-y},
url = {https://juser.fz-juelich.de/record/829474},
}