Repository: Freie Universität Berlin, Math Department

NFGAIL Amyloid Oligomers: The Onset of Beta-Sheet Formation and the Mechanism for Fibril Formation

Hoffmann, Waldemar and Folmert, Kristin and Moschner, Johann and Xing Huang, Xing Huang and von Berlepsch, Hans and Koksch, Beate and Bowers, Michael T. and von Helden, Gert and Pagel, Kevin (2018) NFGAIL Amyloid Oligomers: The Onset of Beta-Sheet Formation and the Mechanism for Fibril Formation. J. Am. Chem. Soc. 2018, 140, 244−249, 140 . pp. 244-249.

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Official URL: https://dx.doi/pdf/10.1021/jacs.7b09510

Abstract

The hexapeptide NFGAIL is a highly amyloidogenic peptide, derived from the human islet amyloid polypeptide (hIAPP). Recent investigations indicate that presumably soluble hIAPP oligomers are one of the cytotoxic species in type II diabetes. Here we use thioflavin T staining, transmission electron microscopy, as well as ion mobility-mass spectrometry coupled to infrared (IR) spectroscopy to study the amyloid formation mechanism and the quaternary and secondary structure of soluble NFGAIL oligomers. Our data reveal that at neutral pH NFGAIL follows a nucleation dependent mechanism to form amyloid fibrils. During the lag phase, highly polydisperse, polymorph, and compact oligomers (oligomer number n = 2−13) as well as extended intermediates (n = 4−11) are present. IR secondary structural analysis reveals that compact conformations adopt turn-like structures, whereas extended oligomers exhibit a significant amount of β-sheet content. This agrees well with previous molecular dynamic simulations and provides direct experimental evidence that unordered off-pathway NFGAIL aggregates up to the size of at least the 13-mer as well as partially folded β-sheet containing oligomers are coexisting.

Item Type:Article
Subjects:Mathematical and Computer Sciences > Mathematics > Applied Mathematics
Divisions:Department of Mathematics and Computer Science > Institute of Mathematics
ID Code:2405
Deposited By: Monika Drueck
Deposited On:18 Feb 2020 14:27
Last Modified:18 Feb 2020 14:27

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