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Novel tau filament fold in chronic traumatic encephalopathy encloses hydrophobic molecules

DOI: 10.1038/s41586-019-1026-5 DOI Help

Authors: Benjamin Falcon (MRC Laboratory of Molecular Biology) , Jasenko Zivanov (MRC Laboratory of Molecular Biology) , Wenjuan Zhang (MRC Laboratory of Molecular Biology) , Alexey G. Murzin (MRC Laboratory of Molecular Biology) , Holly J. Garringer (Indiana University School of Medicine) , Ruben Vidal (Indiana University School of Medicine) , R. Anthony Crowther (MRC Laboratory of Molecular Biology) , Kathy L. Newell (University of Kansas School of Medicine) , Bernardino Ghetti (Indiana University School of Medicine) , Michel Goedert (MRC Laboratory of Molecular Biology) , Sjors H. W. Scheres (MRC Laboratory of Molecular Biology)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature , VOL 91

State: Published (Approved)
Published: March 2019
Diamond Proposal Number(s): 17434

Abstract: Chronic traumatic encephalopathy (CTE) is a neurodegenerative tauopathy that is associated with repetitive head impacts or exposure to blast waves. First described as punch-drunk syndrome and dementia pugilistica in retired boxers1,2,3, CTE has since been identified in former participants of other contact sports, ex-military personnel and after physical abuse4,5,6,7. No disease-modifying therapies currently exist, and diagnosis requires an autopsy. CTE is defined by an abundance of hyperphosphorylated tau protein in neurons, astrocytes and cell processes around blood vessels8,9. This, together with the accumulation of tau inclusions in cortical layers II and III, distinguishes CTE from Alzheimer’s disease and other tauopathies10,11. However, the morphologies of tau filaments in CTE and the mechanisms by which brain trauma can lead to their formation are unknown. Here we determine the structures of tau filaments from the brains of three individuals with CTE at resolutions down to 2.3 Å, using cryo-electron microscopy. We show that filament structures are identical in the three cases but are distinct from those of Alzheimer’s and Pick’s diseases, and from those formed in vitro12,13,14,15. Similar to Alzheimer’s disease12,14,16,17,18, all six brain tau isoforms assemble into filaments in CTE, and residues K274–R379 of three-repeat tau and S305–R379 of four-repeat tau form the ordered core of two identical C-shaped protofilaments. However, a different conformation of the β-helix region creates a hydrophobic cavity that is absent in tau filaments from the brains of patients with Alzheimer’s disease. This cavity encloses an additional density that is not connected to tau, which suggests that the incorporation of cofactors may have a role in tau aggregation in CTE. Moreover, filaments in CTE have distinct protofilament interfaces to those of Alzheimer’s disease. Our structures provide a unifying neuropathological criterion for CTE, and support the hypothesis that the formation and propagation of distinct conformers of assembled tau underlie different neurodegenerative diseases.

Journal Keywords: Alzheimer's disease; Cryoelectron microscopy; Molecular neuroscience; Neurodegeneration

Subject Areas: Biology and Bio-materials

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