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- PDB-7q3u: Cryo-EM structure of TDP43 core peptide amyloid fiber -

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Basic information

Entry
Database: PDB / ID: 7q3u
TitleCryo-EM structure of TDP43 core peptide amyloid fiber
ComponentsTAR DNA-binding protein 43
KeywordsRNA BINDING PROTEIN / TDP-43 / Amyloid / Neurodegeneration / Helical / Cryo-EM
Function / homology
Function and homology information


nuclear inner membrane organization / interchromatin granule / perichromatin fibrils / 3'-UTR-mediated mRNA destabilization / 3'-UTR-mediated mRNA stabilization / intracellular non-membrane-bounded organelle / negative regulation by host of viral transcription / pre-mRNA intronic binding / molecular condensate scaffold activity / response to endoplasmic reticulum stress ...nuclear inner membrane organization / interchromatin granule / perichromatin fibrils / 3'-UTR-mediated mRNA destabilization / 3'-UTR-mediated mRNA stabilization / intracellular non-membrane-bounded organelle / negative regulation by host of viral transcription / pre-mRNA intronic binding / molecular condensate scaffold activity / response to endoplasmic reticulum stress / RNA splicing / negative regulation of protein phosphorylation / mRNA 3'-UTR binding / regulation of protein stability / regulation of circadian rhythm / positive regulation of insulin secretion / mRNA processing / cytoplasmic stress granule / positive regulation of protein import into nucleus / rhythmic process / double-stranded DNA binding / regulation of gene expression / regulation of apoptotic process / amyloid fibril formation / regulation of cell cycle / nuclear speck / RNA polymerase II cis-regulatory region sequence-specific DNA binding / negative regulation of gene expression / lipid binding / mitochondrion / DNA binding / RNA binding / nucleoplasm / identical protein binding / nucleus
Similarity search - Function
: / TAR DNA-binding protein 43, C-terminal / TAR DNA-binding protein 43, N-terminal / TAR DNA-binding protein 43, N-terminal domain / RNA recognition motif / RNA recognition motif / Eukaryotic RNA Recognition Motif (RRM) profile. / RNA recognition motif domain / RNA-binding domain superfamily / Nucleotide-binding alpha-beta plait domain superfamily
Similarity search - Domain/homology
TAR DNA-binding protein 43
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsNazarov, S.
Funding support Switzerland, 1items
OrganizationGrant numberCountry
Swiss National Science Foundation Switzerland
CitationJournal: Nat Neurosci / Year: 2023
Title: Seeding the aggregation of TDP-43 requires post-fibrillization proteolytic cleavage.
Authors: Senthil T Kumar / Sergey Nazarov / Sílvia Porta / Niran Maharjan / Urszula Cendrowska / Malek Kabani / Francesco Finamore / Yan Xu / Virginia M-Y Lee / Hilal A Lashuel /
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 ...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.
History
DepositionOct 28, 2021Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 22, 2023Provider: repository / Type: Initial release
Revision 1.1Apr 12, 2023Group: Structure summary / Category: em_entity_assembly / Item: _em_entity_assembly.name
Revision 1.2Oct 4, 2023Group: Data collection / Database references
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: TAR DNA-binding protein 43
B: TAR DNA-binding protein 43
C: TAR DNA-binding protein 43
D: TAR DNA-binding protein 43
E: TAR DNA-binding protein 43


Theoretical massNumber of molelcules
Total (without water)40,2135
Polymers40,2135
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area21040 Å2
ΔGint-70 kcal/mol
Surface area11230 Å2
MethodPISA

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Components

#1: Protein
TAR DNA-binding protein 43 / / TDP-43


Mass: 8042.687 Da / Num. of mol.: 5
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TARDBP, TDP43 / Production host: Escherichia coli (E. coli) / References: UniProt: Q13148

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Experimental details

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Experiment

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

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Sample preparation

ComponentName: Helical filament from TDP43 core peptide / Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 90 %

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 81000 X / Nominal defocus max: 2000 nm / Nominal defocus min: 900 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 3.99 sec. / Electron dose: 40 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of real images: 3171

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Processing

EM software
IDNameVersionCategory
2EPU2.6.1image acquisition
7Coot0.9.6model fitting
9RELION3.1initial Euler assignment
10RELION3.1final Euler assignment
11RELION3.1classification
12RELION3.13D reconstruction
13PHENIX1.19.2-4158model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -3.09 ° / Axial rise/subunit: 4.83 Å / Axial symmetry: C1
3D reconstructionResolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 5795 / Symmetry type: HELICAL
Atomic model buildingB value: 103 / Protocol: AB INITIO MODEL / Space: REAL

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