The European Physical Journal E

, 36:74

Change of dynamics of raft-model membrane induced by amyloid-β protein binding

Authors

    • Gunma University
  • Ryota Kimura
    • Gunma University
  • Kazuki Takeuchi
    • Gunma University
  • Masaaki Sugiyama
    • Research Reactor InstituteKyoto University
  • Kouji Kasahara
    • The Tokyo Metropolitan Institute of Medical Science
  • Noboru Ohta
    • Japan Synchrotron Radiation Research Institute
  • Bela Farago
    • Institut Laue-Langevin
  • Andreas Stadler
    • Institut Laue-Langevin
    • Research Centre JülichISB-2:Molecular Biophysics
  • Giuseppe Zaccai
    • Institut Laue-Langevin
Regular Article

DOI: 10.1140/epje/i2013-13074-3

Cite this article as:
Hirai, M., Kimura, R., Takeuchi, K. et al. Eur. Phys. J. E (2013) 36: 74. doi:10.1140/epje/i2013-13074-3
Part of the following topical collections:
  1. Neutron Biological Physics

Abstract

While the steady-state existence in the size and shape of liquid-ordered microdomains in cell membranes, the so-called “lipid rafts”, still remain the subject of debate, glycosphingolipid-cholesterol rich regions in plasma membranes have been considered to have a function as platforms for signaling and sorting. In addition, recent spectroscopic studies show that the interaction between monosialoganglioside and amyloid beta (Aβ protein promotes the transition of Aβ from the native structure to the cross-beta fold in amyloid aggregates. However, there is few evidence on the dynamics of “lipid rafts” membranes. As the neutron spin-echo (NSE) technique is well known to detect directly slow dynamics of membrane systems in situ, by the combination of NSE and small-angle X-ray scattering we have studied the effect of the interaction between raft-model membrane and amyloid Aβ proteins on the structure and dynamics of a large uni-lamellar vesicle (LUV) consisting of monosialoganglioside-cholesterol-phospholipid ternary mixtures as a model of lipid-raft membrane. We have found that the interaction between the Aβ proteins and the model membrane at the liquid crystal phase significantly suppresses a bending-diffusion motion with a minor effect on the LUV structure. The present results would suggest a possibility of non-receptor-mediated disorder in signaling through a modulation of a membrane dynamics induced by the association of amyloidogenic peptides on a plasma membrane.

Graphical abstract

https://static-content.springer.com/image/art%3A10.1140%2Fepje%2Fi2013-13074-3/MediaObjects/10189_2013_9887_Figa_HTML.jpg

Keywords

Topical issue: Neutron Biological Physics

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013