Effects of Detergent on α-Synuclein Structure. A Native MS-Ion Mobility Study

Area of Science:

• Biochemistry
• Neuroscience
• Structural Biology

Background:

• Intrinsically disordered protein alpha-synuclein is central to Parkinson's disease pathogenesis.
• Alpha-synuclein aggregation in neuronal cells leads to neurodegeneration.
• Membrane interactions are crucial for alpha-synuclein's function, including neurotransmitter release.

Purpose of the Study:

• To understand alpha-synuclein interaction with membrane models using detergents.
• To investigate how these interactions affect protein conformation and oligomerization.
• To determine the influence of detergent properties (concentration, structure, charge) and Ca2+ ions.

Main Methods:

• Utilized various detergents to mimic biological membranes.
• Employed native nano-electrospray ionization ion mobility-mass spectrometry.
• Investigated detergent binding stoichiometry, affinity, and conformational changes.

Main Results:

• Alpha-synuclein monomers interact with detergent molecules regardless of charge.
• Protein-micelle interactions were confirmed.
• Detergent micelle properties significantly influence alpha-synuclein conformation and interaction.

Conclusions:

• Membrane mimetics reveal key aspects of alpha-synuclein-membrane interactions.
• Detergent properties are critical factors modulating alpha-synuclein behavior.
• This provides insights into alpha-synuclein's role in Parkinson's disease.