Download MendeleySeeding the aggregation of TDP-43 requires post-fibrillization proteolytic cleavage.
Kumar, S.T., Nazarov, S., Porta, S., Maharjan, N., Cendrowska, U., Kabani, M., Finamore, F., Xu, Y., Lee, V.M., Lashuel, H.A.(2023) Nat Neurosci 26: 983-996
- PubMed: 37248338
- DOI: https://doi.org/10.1038/s41593-023-01341-4
- Primary Citation of Related Structures:
7Q3U - PubMed Abstract:
Despite the strong evidence linking the transactive response DNA-binding protein 43 (TDP-43) aggregation to the pathogenesis of frontotemporal lobar degeneration with TDP-43, amyotrophic lateral sclerosis and several neurodegenerative diseases, our knowledge of the sequence and structural determinants of its aggregation and neurotoxicity remains incomplete. Herein, we present a new method for producing recombinant full-length TDP-43 filaments that exhibit sequence and morphological features similar to those of brain-derived TDP-43 filaments. We show that TDP-43 filaments contain a β-sheet-rich helical amyloid core that is fully buried by the flanking structured domains of the protein. We demonstrate that the proteolytic cleavage of TDP-43 filaments and exposure of this amyloid core are necessary for propagating TDP-43 pathology and enhancing the seeding of brain-derived TDP-43 aggregates. Only TDP-43 filaments with exposed amyloid core efficiently seeded the aggregation of endogenous TDP-43 in cells. These findings suggest that inhibiting the enzymes mediating cleavage of TDP-43 aggregates represents a viable disease-modifying strategy to slow the progression of amyotrophic lateral sclerosis and other TDP-43 proteinopathies.
Organizational Affiliation:
Laboratory of Molecular and Chemical Biology of Neurodegeneration, Brain Mind Institute, EPFL, Lausanne, Switzerland.
