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Article

Nanoscale Surface Topography Modulates hIAPP Aggregation Pathways at Solid–Liquid Interfaces

Technical and Macromolecular Chemistry, Paderborn University, Warburger Str. 100, 33098 Paderborn, Germany
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Author to whom correspondence should be addressed.
Academic Editor: Massimiliano Magro
Int. J. Mol. Sci. 2021, 22(10), 5142; https://doi.org/10.3390/ijms22105142
Received: 21 April 2021 / Revised: 7 May 2021 / Accepted: 11 May 2021 / Published: 13 May 2021
(This article belongs to the Special Issue Bio-Nano Interactions)
The effects that solid–liquid interfaces exert on the aggregation of proteins and peptides are of high relevance for various fields of basic and applied research, ranging from molecular biology and biomedicine to nanotechnology. While the influence of surface chemistry has received a lot of attention in this context, the role of surface topography has mostly been neglected so far. In this work, therefore, we investigate the aggregation of the type 2 diabetes-associated peptide hormone hIAPP in contact with flat and nanopatterned silicon oxide surfaces. The nanopatterned surfaces are produced by ion beam irradiation, resulting in well-defined anisotropic ripple patterns with heights and periodicities of about 1.5 and 30 nm, respectively. Using time-lapse atomic force microscopy, the morphology of the hIAPP aggregates is characterized quantitatively. Aggregation results in both amorphous aggregates and amyloid fibrils, with the presence of the nanopatterns leading to retarded fibrillization and stronger amorphous aggregation. This is attributed to structural differences in the amorphous aggregates formed at the nanopatterned surface, which result in a lower propensity for nucleating amyloid fibrillization. Our results demonstrate that nanoscale surface topography may modulate peptide and protein aggregation pathways in complex and intricate ways. View Full-Text
Keywords: surface topography; amyloid; adsorption; atomic force microscopy; pattern formation; self-assembly surface topography; amyloid; adsorption; atomic force microscopy; pattern formation; self-assembly
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MDPI and ACS Style

Hanke, M.; Yang, Y.; Ji, Y.; Grundmeier, G.; Keller, A. Nanoscale Surface Topography Modulates hIAPP Aggregation Pathways at Solid–Liquid Interfaces. Int. J. Mol. Sci. 2021, 22, 5142. https://doi.org/10.3390/ijms22105142

AMA Style

Hanke M, Yang Y, Ji Y, Grundmeier G, Keller A. Nanoscale Surface Topography Modulates hIAPP Aggregation Pathways at Solid–Liquid Interfaces. International Journal of Molecular Sciences. 2021; 22(10):5142. https://doi.org/10.3390/ijms22105142

Chicago/Turabian Style

Hanke, Marcel, Yu Yang, Yuxin Ji, Guido Grundmeier, and Adrian Keller. 2021. "Nanoscale Surface Topography Modulates hIAPP Aggregation Pathways at Solid–Liquid Interfaces" International Journal of Molecular Sciences 22, no. 10: 5142. https://doi.org/10.3390/ijms22105142

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