Structural characterisation of α-synuclein-membrane interactions and the resulting aggregation using small angle...

Area of Science:

• Biochemistry
• Neuroscience
• Materials Science

Background:

• Amyloid fibrils are key in neurodegenerative diseases.
• Lipid interactions accelerate amyloid formation, particularly primary nucleation.
• The precise mechanism of lipid-accelerated amyloidogenesis remains unclear.

Purpose of the Study:

• To investigate the structural mechanisms of alpha-synuclein binding to model lipid membranes.
• To elucidate the role of lipids in the co-assembly into amyloid fibrils.
• To understand how lipids influence the early stages of amyloid formation.

Main Methods:

• Dynamic Light Scattering (DLS)
• Small-Angle X-ray Scattering (SAXS)
• Small-Angle Neutron Scattering (SANS)

Main Results:

• Lipid membranes undergo significant structural changes upon alpha-synuclein binding.
• Alpha-synuclein induces membrane break-up into small, disc- or rod-like lipid-protein particles.
• These particles mature into amyloid fibrils over time, incorporating lipids.

Conclusions:

• Model membranes play an active role in alpha-synuclein amyloidogenesis.
• Lipid-protein particle intermediates are crucial for fibril formation.
• Understanding these interactions may offer therapeutic targets for neurodegenerative diseases.