AI Article Synopsis
- - The main feature of Parkinson disease (PD) and Lewy body dementia (LBD) is the buildup of alpha-synuclein (Asyn) fibrils in structures known as Lewy bodies and neurites.
- - A new method was developed to amplify Asyn fibrils from postmortem LBD tissue, allowing researchers to study their atomic structure using solid state nuclear magnetic resonance (SSNMR).
- - The amplified Asyn fibrils consist of two protofilaments with a specific structural arrangement, showing similarities to a previous study, which provides insights for understanding disease mechanisms and potential treatments targeting Asyn.
Article Abstract
The defining feature of Parkinson disease (PD) and Lewy body dementia (LBD) is the accumulation of alpha-synuclein (Asyn) fibrils in Lewy bodies and Lewy neurites. We developed and validated a novel method to amplify Asyn fibrils extracted from LBD postmortem tissue samples and used solid state nuclear magnetic resonance (SSNMR) studies to determine atomic resolution structure. Amplified LBD Asyn fibrils comprise two protofilaments with pseudo-2 helical screw symmetry, very low twist and an interface formed by antiparallel beta strands of residues 85-93. The fold is highly similar to the fold determined by a recent cryo-electron microscopy study for a minority population of twisted single protofilament fibrils extracted from LBD tissue. These results expand the structural landscape of LBD Asyn fibrils and inform further studies of disease mechanisms, imaging agents and therapeutics targeting Asyn.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9882085 | PMC |
| http://dx.doi.org/10.1101/2023.01.09.523303 | DOI Listing |
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