Creating gradients of amyloid fibrils from the liquid-liquid interface

Soft Matter. 2019 Oct 30;15(42):8437-8440. doi: 10.1039/c9sm01826c.

Abstract

We report a method to deposit amyloid fibrils on a substrate creating gradients in orientation and coverage on demand. For this purpose, we adapt a colloidal self-assembly method at liquid-liquid interfaces to deposit amyloid fibrils on a substrate from the water-hexane interface, while simultaneously compressing it. The amyloid fibril layers orient perpendicularly to the compression, ranging from isotropic to nematic distributions. We furthermore observe reproducible transitions from a monolayer to a bilayer and from a bilayer to multilayers with increasing surface pressures. The creation of each new layer is accompanied by a systematic drop in the structural order of the system, which is however regained upon further compression. This method shows great potential for overcoming the thin-film engineering challenges associated with the manipulation of sticky amyloid fibrils, and allows their ex situ visualisation under compression at the fluid-fluid interface, a situation relevant to understand the propagation of amyloid-related diseases, their functional role in biological systems, and their potential for technological applications.

MeSH terms

  • Amyloid / metabolism*
  • Hexanes / chemistry
  • Membranes, Artificial
  • Protein Conformation
  • Water / chemistry

Substances

  • Amyloid
  • Hexanes
  • Membranes, Artificial
  • Water