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- PDB-7mkf: Paired helical tau filament extracted from PrP-CAA Patient brain ... -

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Basic information

Entry
Database: PDB / ID: 7mkf
TitlePaired helical tau filament extracted from PrP-CAA Patient brain tissue | tau filament | PHF Tau
ComponentsIsoform Tau-F of Microtubule-associated protein tau
KeywordsPROTEIN FIBRIL / tau filament / GSS / PrP-CAA / amyloid fibril / Alzheimer disease
Function / homologyActivation of AMPK downstream of NMDARs / PKR-mediated signaling / Isoform Tau-F of Microtubule-associated protein tau
Function and homology information
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3 Å
AuthorsHoq, M.R.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Neurological Disorders and Stroke (NIH/NINDS)R01-AG071177 United States
CitationJournal: Acta Neuropathol / Year: 2021
Title: Structure of Tau filaments in Prion protein amyloidoses.
Authors: Grace I Hallinan / Md Rejaul Hoq / Manali Ghosh / Frank S Vago / Anllely Fernandez / Holly J Garringer / Ruben Vidal / Wen Jiang / Bernardino Ghetti /
Abstract: In human neurodegenerative diseases associated with the intracellular aggregation of Tau protein, the ordered cores of Tau filaments adopt distinct folds. Here, we analyze Tau filaments isolated from ...In human neurodegenerative diseases associated with the intracellular aggregation of Tau protein, the ordered cores of Tau filaments adopt distinct folds. Here, we analyze Tau filaments isolated from the brain of individuals affected by Prion-Protein cerebral amyloid angiopathy (PrP-CAA) with a nonsense mutation in the PRNP gene that leads to early termination of translation of PrP (Q160Ter or Q160X), and Gerstmann-Sträussler-Scheinker (GSS) disease, with a missense mutation in the PRNP gene that leads to an amino acid substitution at residue 198 (F198S) of PrP. The clinical and neuropathologic phenotypes associated with these two mutations in PRNP are different; however, the neuropathologic analyses of these two genetic variants have consistently shown the presence of numerous neurofibrillary tangles (NFTs) made of filamentous Tau aggregates in neurons. We report that Tau filaments in PrP-CAA (Q160X) and GSS (F198S) are composed of 3-repeat and 4-repeat Tau isoforms, having a striking similarity to NFTs in Alzheimer disease (AD). In PrP-CAA (Q160X), Tau filaments are made of both paired helical filaments (PHFs) and straight filaments (SFs), while in GSS (F198S), only PHFs were found. Mass spectrometry analyses of Tau filaments extracted from PrP-CAA (Q160X) and GSS (F198S) brains show the presence of post-translational modifications that are comparable to those seen in Tau aggregates from AD. Cryo-EM analysis reveals that the atomic models of the Tau filaments obtained from PrP-CAA (Q160X) and GSS (F198S) are identical to those of the Tau filaments from AD, and are therefore distinct from those of Pick disease, chronic traumatic encephalopathy, and corticobasal degeneration. Our data support the hypothesis that in the presence of extracellular amyloid deposits and regardless of the primary amino acid sequence of the amyloid protein, similar molecular mechanisms are at play in the formation of identical Tau filaments.
History
DepositionApr 23, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jul 28, 2021Provider: repository / Type: Initial release
Revision 1.1May 29, 2024Group: Data collection / Database references / Structure summary
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / struct
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession / _struct.title

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Assembly

Deposited unit
A: Isoform Tau-F of Microtubule-associated protein tau
B: Isoform Tau-F of Microtubule-associated protein tau
C: Isoform Tau-F of Microtubule-associated protein tau
D: Isoform Tau-F of Microtubule-associated protein tau
E: Isoform Tau-F of Microtubule-associated protein tau
F: Isoform Tau-F of Microtubule-associated protein tau
G: Isoform Tau-F of Microtubule-associated protein tau
H: Isoform Tau-F of Microtubule-associated protein tau
I: Isoform Tau-F of Microtubule-associated protein tau
J: Isoform Tau-F of Microtubule-associated protein tau


Theoretical massNumber of molelcules
Total (without water)459,19910
Polymers459,19910
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area51080 Å2
ΔGint-130 kcal/mol
Surface area30570 Å2

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Components

#1: Protein
Isoform Tau-F of Microtubule-associated protein tau / Neurofibrillary tangle protein / Paired helical filament-tau / PHF-tau


Mass: 45919.871 Da / Num. of mol.: 10 / Source method: isolated from a natural source / Source: (natural) Homo sapiens (human) / References: UniProt: P10636-8

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: Paired helical filament (PHF) from PrP-CAA / Type: ORGANELLE OR CELLULAR COMPONENT
Details: PHF tau in PrP-CAA, caused by the Q160X truncating mutation in PRNP
Entity ID: all / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 1.067 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 2004

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -1.2 ° / Axial rise/subunit: 4.77 Å / Axial symmetry: C1
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 60 / Symmetry type: HELICAL

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