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Article Dans Une Revue FEBS Journal Année : 2019

Structural dissection of amyloid aggregates of TDP-43 and its C-terminal fragments TDP-35 and TDP-16

Résumé

The TAR DNA-binding protein (TDP-43) self-assembles into prion-like aggregates considered to be the structural hallmark of amyotrophic lateral sclerosis and frontotemporal dementia. Here we use a combination of electron microscopy, X-ray fiber diffraction, FT-IR analysis and solid-state NMR spectroscopy to investigate the molecular organization of different TDP constructs, namely the full-length TDP-43 (1-414), two C-terminal fragments (TDP-35 (90-414) and TDP-16 (267-414)) and a C-terminal truncated fragment (TDP-43 ∆GaroS2), in their fibrillar state. Although the different protein constructs exhibit similar fibril morphology and a typical cross-β signature by X-ray diffraction, solid-state NMR indicates that TDP-43 and TDP-35 share the same polymorphic molecular structure, while TDP-16 encompasses a well-ordered amyloid core. We identified several residues in the so-called C-terminal GaroS2 (368-414) domain that participates in the rigid core of TDP-16 fibrils, underlining its importance during the aggregation process. Our findings demonstrate that C-terminal fragments can adopt a different molecular conformation in isolation or in the context of the full-length assembly, suggesting that the N-terminal domain and RRM domains play an important role in the TDP-43 amyloid transition.

Dates et versions

hal-02389244 , version 1 (02-12-2019)

Identifiants

Citer

Jayakrishna Shenoy K P, Nadia El Mammeri, Antoine Dutour, Mélanie Berbon, Ahmad Saad, et al.. Structural dissection of amyloid aggregates of TDP-43 and its C-terminal fragments TDP-35 and TDP-16. FEBS Journal, 2019, 287 (12), pp.2449-2467. ⟨10.1111/febs.15159⟩. ⟨hal-02389244⟩
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