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Updated: Jun 12, 2025

Recombinant α- β- and γ-Synucleins Stimulate Protein Phosphatase 2A Catalytic Subunit Activity in Cell Free Assays
Published on: August 13, 2017
α-Synuclein interacts directly with AP2 and regulates its binding to synaptic membranes
Karina J Vargas1, Jaqulin N Wallace2, Ian Mooney3
1Cell Biology Department, University of Pittsburgh, Pittsburgh, Pennsylvania, USA; The Eugene Bell Center for Regenerative Biology and Tissue Engineering, Marine Biological Laboratory, Woods Hole, Massachusetts, USA.
Alpha-synuclein stabilizes the clathrin adaptor protein-2 (AP2) on synaptic membranes, a key step for clathrin-mediated synaptic vesicle endocytosis. This interaction is crucial for regulating endocytosis in neurodegenerative diseases.
Area of Science:
- Neurobiology
- Molecular Neuroscience
- Cell Biology
Background:
- Alpha-synuclein mutations are linked to neurodegenerative diseases like Parkinson's.
- Alpha-synuclein regulates clathrin-mediated synaptic vesicle endocytosis at presynapses.
- The precise molecular mechanism of alpha-synuclein's role in endocytosis was previously unknown.
Purpose of the Study:
- To elucidate the molecular mechanism by which alpha-synuclein regulates clathrin-mediated synaptic vesicle endocytosis.
- To investigate the interaction between alpha-synuclein and the clathrin adaptor protein-2 (AP2).
- To determine the role of alpha-synuclein in the stabilization of AP2 on synaptic membranes.
Main Methods:
- Co-localization studies of alpha-synuclein and AP2 at presynapses.
- Biochemical assays to detect direct interaction between alpha-synuclein and AP2.
- Synaptic membrane binding assays in an ATP-dependent manner.
- Immunodepletion experiments to assess the necessity of alpha-synuclein for AP2 binding.
Main Results:
- Strong co-localization of alpha-synuclein and AP2 was observed at presynapses.
- A direct biochemical interaction between the AP2 core domain and alpha-synuclein C-terminal domain was confirmed.
- Alpha-synuclein, AP2, and AP180 share a common ATP-dependent synaptic membrane binding pathway.
- Immunodepletion of alpha-synuclein specifically reduced AP2 binding to synaptic membranes.
Conclusions:
- Alpha-synuclein plays a critical role in stabilizing AP2 on synaptic membranes.
- This stabilization by alpha-synuclein is essential for the initiation of clathrin-mediated synaptic vesicle endocytosis.
- Understanding this mechanism provides insights into neurodegenerative disorders associated with alpha-synuclein dysfunction.
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