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- PDB-6n3c: SegB, conformation of TDP-43 low complexity domain segment A -

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Basic information

Entry
Database: PDB / ID: 6n3c
TitleSegB, conformation of TDP-43 low complexity domain segment A
ComponentsTAR DNA-binding protein 43
Keywordsdna binding protein / protein fibril / Amyloid / TDP43 / ALS / FTLD-TDP
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: 3.3 Å
AuthorsCao, Q. / Boyer, D.R. / Sawaya, M.R. / Eisenberg, D.S.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute on Aging (NIH/NIA)AG0543022 United States
CitationJournal: Nat Struct Mol Biol / Year: 2019
Title: Cryo-EM structures of four polymorphic TDP-43 amyloid cores.
Authors: Qin Cao / David R Boyer / Michael R Sawaya / Peng Ge / David S Eisenberg /
Abstract: The DNA and RNA processing protein TDP-43 undergoes both functional and pathogenic aggregation. Functional TDP-43 aggregates form reversible, transient species such as nuclear bodies, stress ...The DNA and RNA processing protein TDP-43 undergoes both functional and pathogenic aggregation. Functional TDP-43 aggregates form reversible, transient species such as nuclear bodies, stress granules, and myo-granules. Pathogenic, irreversible TDP-43 aggregates form in amyotrophic lateral sclerosis and other neurodegenerative conditions. Here we find the features of TDP-43 fibrils that confer both reversibility and irreversibility by determining structures of two segments reported to be the pathogenic cores of human TDP-43 aggregation: SegA (residues 311-360), which forms three polymorphs, all with dagger-shaped folds; and SegB A315E (residues 286-331 containing the amyotrophic lateral sclerosis hereditary mutation A315E), which forms R-shaped folds. Energetic analysis suggests that the dagger-shaped polymorphs represent irreversible fibril structures, whereas the SegB polymorph may participate in both reversible and irreversible fibrils. Our structures reveal the polymorphic nature of TDP-43 and suggest how the A315E mutation converts the R-shaped polymorph to an irreversible form that enhances pathology.
History
DepositionNov 14, 2018Deposition site: RCSB / Processing site: RCSB
Revision 1.0Jun 26, 2019Provider: repository / Type: Initial release
Revision 1.1Jul 10, 2019Group: Data collection / Database references / Category: citation / citation_author / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jul 17, 2019Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Dec 18, 2019Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.4Mar 20, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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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
F: TAR DNA-binding protein 43
G: TAR DNA-binding protein 43
H: TAR DNA-binding protein 43
I: TAR DNA-binding protein 43
J: TAR DNA-binding protein 43
K: TAR DNA-binding protein 43
L: TAR DNA-binding protein 43
M: TAR DNA-binding protein 43
N: TAR DNA-binding protein 43
O: TAR DNA-binding protein 43
P: TAR DNA-binding protein 43
Q: TAR DNA-binding protein 43
R: TAR DNA-binding protein 43
S: TAR DNA-binding protein 43
T: TAR DNA-binding protein 43


Theoretical massNumber of molelcules
Total (without water)88,09620
Polymers88,09620
Non-polymers00
Water0
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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


Mass: 4404.797 Da / Num. of mol.: 20 / Mutation: A315E
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: TARDBP, TDP43 / Plasmid: pET28a / Production host: Escherichia coli BL21(DE3) (bacteria) / Strain (production host): BL21(DE3) / References: UniProt: Q13148

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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: TDP43 fibril / Type: ORGANELLE OR CELLULAR COMPONENT / Entity ID: all / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7.4
SpecimenEmbedding 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: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 2 nm / Nominal defocus min: 2 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Image recordingAverage exposure time: 8 sec. / Electron dose: 48 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

EM software
IDNameVersionCategoryDetails
1EMAN2particle selectione2helixboxer.py
2Leginon3image acquisition
4CTFFIND4.1.8CTF correction
9PHENIXreal_space_refinemodel refinement
10RELION2initial Euler assignment
11RELION2final Euler assignment
13RELION23D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: 179.356481 ° / Axial rise/subunit: 2.405438 Å / Axial symmetry: C1
3D reconstructionResolution: 3.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 89153 / Symmetry type: HELICAL
Atomic model buildingProtocol: AB INITIO MODEL

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