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Avidity within the N-terminal anchor drives α-synuclein membrane interaction and insertion
Ersoy Cholak1, Katrine Bugge2, Adree Khondker3
1Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark.
Alpha-synuclein (aSN) membrane binding requires dual interactions: N-terminal tail insertion and helix formation. This avidity is crucial for aSN
Area of Science:
- Neuroscience
- Biochemistry
- Structural Biology
Background:
- Alpha-synuclein (aSN) exists in cytosolic and membrane-bound forms, complicating its study.
- Understanding aSN's structural heterogeneity is key to its physiological and pathological roles.
Purpose of the Study:
- To characterize the properties of alpha-synuclein (aSN) in lipid mixtures, co-structures, and mammalian cells.
- To elucidate the mechanism of aSN's membrane interaction and binding avidity.
Main Methods:
- Interdisciplinary approach using aSN:lipid mixtures and isolated co-structures.
- Analysis of aSN in mammalian cells.
- Characterization of the N-terminal membrane anchor.
Main Results:
- Membrane interaction depends on N-terminal tail (NTT) insertion and a folded-upon-binding helix.
- Both binding events are essential; loss of NTT insertion severely compromises membrane affinity.
- Compromised cooperativity in cells leads to reduced membrane association.
Conclusions:
- Avidity within the N-terminal anchor couples NTT insertion and helical binding.
- This coupling is critical for aSN membrane interaction, cellular localization, and potentially membrane fusion.
- The findings provide insights into aSN's role in cellular processes and disease.
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