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Zottig X, Al-Halifa S, Babych M, Quittot N, Archambault D, Bourgault S. Guiding the Morphology of Amyloid Assemblies by Electrostatic Capping: from Polymorphic Twisted Fibrils to Uniform Nanorods. Small 2019; 15:e1901806. [PMID: 31268238 DOI: 10.1002/smll.201901806] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 05/31/2019] [Indexed: 06/09/2023]
Abstract
Peptides that self-assemble into cross-β-sheet amyloid structures constitute promising building blocks to construct highly ordered proteinaceous materials and nanoparticles. Nevertheless, the intrinsic polymorphism of amyloids and the difficulty of controlling self-assembly currently limit their usage. In this study, the effect of electrostatic interactions on the supramolecular organization of peptide assemblies is investigated to gain insights into the structural basis of the morphological diversities of amyloids. Different charged capping units are introduced at the N-terminus of a potent β-sheet-forming sequence derived from the 20-29 segment of islet amyloid polypeptide, known to self-assemble into polymorphic fibrils. By tuning the charge and the electrostatic strength, different mesoscopic morphologies are obtained, including nanorods, rope-like fibrils, and twisted ribbons. Particularly, the addition of positive capping units leads to the formation of uniform rod-like assemblies, with lengths that can be modulated by the charge number. It is proposed that electrostatic repulsions between N-terminal positive charges hinder β-sheet tape twisting, leading to a unique control over the size of these cytocompatible nanorods by protofilament growth frustration. This study reveals the high susceptibility of amyloid formation to subtle chemical modifications and opens to promising strategies to control the final architecture of proteinaceous assemblies from the peptide sequence.
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Affiliation(s)
- Ximena Zottig
- Chemistry Department, Université du Québec à Montréal, Montreal, Québec, H2L 2C4, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications PROTEO, Québec, G1V 0A6, Canada
| | - Soultan Al-Halifa
- Chemistry Department, Université du Québec à Montréal, Montreal, Québec, H2L 2C4, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications PROTEO, Québec, G1V 0A6, Canada
| | - Margaryta Babych
- Chemistry Department, Université du Québec à Montréal, Montreal, Québec, H2L 2C4, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications PROTEO, Québec, G1V 0A6, Canada
| | - Noé Quittot
- Chemistry Department, Université du Québec à Montréal, Montreal, Québec, H2L 2C4, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications PROTEO, Québec, G1V 0A6, Canada
| | - Denis Archambault
- Department of Biological Sciences, Université du Québec à Montréal, Montreal, Québec, H2X 1Y4, Canada
- Swine and Poultry Infectious Diseases Research Center, CRIPA, Québec, J2S 2M2, Canada
| | - Steve Bourgault
- Chemistry Department, Université du Québec à Montréal, Montreal, Québec, H2L 2C4, Canada
- Quebec Network for Research on Protein Function, Engineering and Applications PROTEO, Québec, G1V 0A6, Canada
- Swine and Poultry Infectious Diseases Research Center, CRIPA, Québec, J2S 2M2, Canada
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vandenAkker CC, Deckert-Gaudig T, Schleeger M, Velikov KP, Deckert V, Bonn M, Koenderink GH. Nanoscale Heterogeneity of the Molecular Structure of Individual hIAPP Amyloid Fibrils Revealed with Tip-Enhanced Raman Spectroscopy. Small 2015; 11:4131-4139. [PMID: 25952953 DOI: 10.1002/smll.201500562] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Indexed: 06/04/2023]
Abstract
Type 2 diabetes mellitus is characterized by the pathological deposition of fibrillized protein, known as amyloids. It is thought that oligomers and/or amyloid fibrils formed from human islet amyloid polypeptide (hIAPP or amylin) cause cell death by membrane damage. The molecular structure of hIAPP amyloid fibrils is dominated by β-sheet structure, as probed with conventional infrared and Raman vibrational spectroscopy. However, with these techniques it is not possible to distinguish between the core and the surface structure of the fibrils. Since the fibril surface crucially affects amyloid toxicity, it is essential to know its structure. Here the surface molecular structure and amino acid residue composition of hIAPP fibrils are specifically probed with nanoscale resolution using tip-enhanced Raman spectroscopy (TERS). The fibril surface mainly contains unordered or α-helical structures, in contrast to the β-sheet-rich core. This experimentally validates recent models of hIAPP amyloids based on NMR measurements. Spatial mapping of the surface structure reveals a highly heterogeneous surface structure. Finally, TERS can probe fibrils formed on a lipid interface, which is more representative of amyloids in vivo.
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Affiliation(s)
| | - Tanja Deckert-Gaudig
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745, Jena, Germany
| | - Michael Schleeger
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Krassimir P Velikov
- Soft Condensed Matter, Debye Institute for Nanomaterials Science, Department of Physics and Astronomy, Utrecht University, Princetonplein 5, 3584, CC, Utrecht, The Netherlands
- Unilever Research Labs, NL-3133 AT Vlaardingen, The Netherlands
| | - Volker Deckert
- Leibniz Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745, Jena, Germany
- Institute for Physical Chemistry and Abbe Center of Photonics, University of Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Mischa Bonn
- Department of Molecular Spectroscopy, Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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