Structure-function relationship of alpha-synuclein fibrillar polymorphs derived from distinct synucleinopathies (Part 3)

ABSTRACT: The aggregation of the protein alpha-synuclein (αSyn) is a common feature of multiple neurodegenerative diseases collectively called synucleinopathies, for which the pathobiology is not well understood. The different phenotypic characteristics of the synucleinopathies Parkinson’s disease (PD), Dementia with Lewy Bodies (DLB) and Multiple System atrophy (MSA) have been proposed to originate from the distinct structures adopted by αSyn in its amyloid forms. Here, using covalent labeling and limited proteolysis coupled to mass spectrometry (LiP-MS) in vitro and in situ within neuronal cells and directly in native patient brain homogenates, we show that pathogenic αSyn from distinct synucleinopathies (PD, DLB and MSA) are structurally different. Further, we found that fibrillar structural differences are associated with different fibril interactomes and neuronal responses. We discovered disease-specific ubiquitination patterns and turnover profiles for pathogenic αSyn species, detected molecular pathways responding specifically to the uptake of different αSyn fibrillar polymorphs, and identified a subset of the involved proteins as candidate direct interactors of αSyn. LiP-MS also identified sets of proteins with altered protease susceptibility in postmortem brain homogenates of PD, DLB, and MSA patients. These sets were largely disease-specific and included proteins altered in cells treated with fibrils derived from patients with the matching disease. Data included in this PRIDE submission concern LiP-MS data (Part 3 of this work). Other data will be found in separate PRIDE submissions with the same title (Parts 1,2,4,5).

INSTRUMENT(S):

ORGANISM(S): Homo Sapiens (human)

TISSUE(S): Brain, Cell Culture

SUBMITTER: Tetiana Serdiuk  

LAB HEAD: Paola Picotti

PROVIDER: PXD058439 | Pride | 2026-06-08

REPOSITORIES: Pride