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Updated: Jan 2, 2026
14:55
Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
Published on: September 17, 2017
15.9K
Two new polymorphic structures of human full-length alpha-synuclein fibrils solved by cryo-electron microscopy
Ricardo Guerrero-Ferreira1, Nicholas Mi Taylor2, Ana-Andreea Arteni3,4
1Center for Cellular Imaging and NanoAnalytics (C-CINA), Biozentrum, University of Basel, Basel, Switzerland.
Elife
|December 10, 2019
Summary
Two new atomic structures of alpha-synuclein fibrils reveal distinct polymorphs, offering new insights into Parkinson's disease (PD) pathogenesis. These structures highlight novel interactions and interfaces crucial for fibril formation and stability.
Area of Science:
- Neuroscience
- Structural Biology
- Biochemistry
Background:
- Alpha-synuclein fibrils are key pathological hallmarks in Parkinson's disease (PD).
- Previous structural studies characterized alpha-synuclein fibrils (residues 1-121) with a specific protofibril interface.
Purpose of the Study:
- To determine the atomic structures of novel alpha-synuclein fibril polymorphs.
- To elucidate the structural basis of fibril formation, growth, and stability in relation to PD.
Main Methods:
- X-ray crystallography at 3.0 Å and 3.4 Å resolution.
- Analysis of fibril morphology, protofilament interactions, and amino acid interfaces.
Main Results:
- Reported two new alpha-synuclein fibril polymorphs (2a and 2b) with a 10 nm diameter.
- Identified unique intermolecular salt-bridges (K45, E57/E46) and N-terminus interactions burying the NAC region.
- Observed a hydrophobic cleft containing familial PD mutation sites.
Conclusions:
- The newly determined structures present a radically different fibril architecture compared to known polymorphs.
- These findings provide a structural basis for understanding alpha-synuclein aggregation in PD.
- The identified features facilitate new hypotheses regarding fibril formation, growth, and stability.
Keywords:
E. coliParkinson's diseasealpha-synucleincryo-EMhumanmolecular biophysicsneurodegenerationneurosciencestructural biologyMore Related Videos
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