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- PDB-5w7v: CryoEM structure of the segment, DLIIKGISVHI, assembled into a tr... -

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Basic information

Entry
Database: PDB / ID: 5w7v
TitleCryoEM structure of the segment, DLIIKGISVHI, assembled into a triple-helical fibril
ComponentsTAR DNA-binding protein 43
KeywordsPROTEIN FIBRIL / Amyloid / steric zipper
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 membraneless organelle / negative regulation of protein phosphorylation / host-mediated suppression of viral transcription / pre-mRNA intronic binding / RNA splicing ...nuclear inner membrane organization / interchromatin granule / perichromatin fibrils / 3'-UTR-mediated mRNA destabilization / 3'-UTR-mediated mRNA stabilization / intracellular membraneless organelle / negative regulation of protein phosphorylation / host-mediated suppression of viral transcription / pre-mRNA intronic binding / RNA splicing / response to endoplasmic reticulum stress / mRNA 3'-UTR binding / molecular condensate scaffold activity / positive regulation of insulin secretion / regulation of circadian rhythm / regulation of protein stability / positive regulation of protein import into nucleus / mRNA processing / cytoplasmic stress granule / rhythmic process / regulation of gene expression / double-stranded DNA binding / 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 / chromatin / mitochondrion / DNA binding / RNA binding / nucleoplasm / identical protein binding / nucleus
Similarity search - Function
TAR DNA-binding protein 43, N-terminal / : / TAR DNA-binding protein 43, N-terminal domain / TAR DNA-binding protein 43, C-terminal / 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: 3.8 Å
AuthorsGuenther, E.L. / Ge, P. / Eisenberg, D.S.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM071940 United States
CitationJournal: Nat Struct Mol Biol / Year: 2018
Title: Atomic-level evidence for packing and positional amyloid polymorphism by segment from TDP-43 RRM2.
Authors: Elizabeth L Guenther / Peng Ge / Hamilton Trinh / Michael R Sawaya / Duilio Cascio / David R Boyer / Tamir Gonen / Z Hong Zhou / David S Eisenberg /
Abstract: Proteins in the fibrous amyloid state are a major hallmark of neurodegenerative disease. Understanding the multiple conformations, or polymorphs, of amyloid proteins at the molecular level is a ...Proteins in the fibrous amyloid state are a major hallmark of neurodegenerative disease. Understanding the multiple conformations, or polymorphs, of amyloid proteins at the molecular level is a challenge of amyloid research. Here, we detail the wide range of polymorphs formed by a segment of human TAR DNA-binding protein 43 (TDP-43) as a model for the polymorphic capabilities of pathological amyloid aggregation. Using X-ray diffraction, microelectron diffraction (MicroED) and single-particle cryo-EM, we show that the DLIIKGISVHI segment from the second RNA-recognition motif (RRM2) forms an array of amyloid polymorphs. These associations include seven distinct interfaces displaying five different symmetry classes of steric zippers. Additionally, we find that this segment can adopt three different backbone conformations that contribute to its polymorphic capabilities. The polymorphic nature of this segment illustrates at the molecular level how amyloid proteins can form diverse fibril structures.
History
DepositionJun 20, 2017Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 14, 2018Provider: repository / Type: Initial release
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Revision 1.1Mar 28, 2018Group: Data collection / Database references / Category: citation
Item: _citation.journal_abbrev / _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Apr 18, 2018Group: Data collection / Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Jul 18, 2018Group: Data collection / Category: em_imaging_optics / Item: _em_imaging_optics.energyfilter_name
Revision 1.4Jan 1, 2020Group: Author supporting evidence / Category: pdbx_audit_support / Item: _pdbx_audit_support.funding_organization
Revision 1.5Mar 13, 2024Group: Data collection / Database references / Derived calculations
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / database_2 / pdbx_struct_oper_list
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession ..._database_2.pdbx_DOI / _database_2.pdbx_database_accession / _pdbx_struct_oper_list.name / _pdbx_struct_oper_list.symmetry_operation / _pdbx_struct_oper_list.type
Revision 1.6May 21, 2025Group: Data collection / Structure summary / Category: em_admin / em_software / pdbx_entry_details / Item: _em_admin.last_update / _em_software.name
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Structure visualization

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  • Biological unit as representative helical assembly
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  • Deposited structure unit
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  • Simplified surface model + fitted atomic model
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Assembly

Deposited unit
1: TAR DNA-binding protein 43
3: TAR DNA-binding protein 43
2: TAR DNA-binding protein 43
6: TAR DNA-binding protein 43
5: TAR DNA-binding protein 43
4: TAR DNA-binding protein 43
7: TAR DNA-binding protein 43
0: TAR DNA-binding protein 43
8: TAR DNA-binding protein 43


Theoretical massNumber of molelcules
Total (without water)10,8859
Polymers10,8859
Non-polymers00
Water00
1
1: TAR DNA-binding protein 43
3: TAR DNA-binding protein 43
2: TAR DNA-binding protein 43
6: TAR DNA-binding protein 43
5: TAR DNA-binding protein 43
4: TAR DNA-binding protein 43
7: TAR DNA-binding protein 43
0: TAR DNA-binding protein 43
8: TAR DNA-binding protein 43
x 30


Theoretical massNumber of molelcules
Total (without water)326,559270
Polymers326,559270
Non-polymers00
Water0
TypeNameSymmetry operationNumber
helical symmetry operation29
identity operation1_555x,y,z1
2


  • Idetical with deposited unit
  • helical asymmetric unit
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
3


  • Idetical with deposited unit
  • helical asymmetric unit, std helical frame
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
SymmetryHelical symmetry: (Circular symmetry: 1 / Dyad axis: no / N subunits divisor: 1 / Num. of operations: 30 / Rise per n subunits: 1.598 Å / Rotation per n subunits: -120.441 °)

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Components

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


Mass: 1209.479 Da / Num. of mol.: 9 / Fragment: RRM2 peptide (UNP residues 247-257) / Source method: obtained synthetically / Source: (synth.) Homo sapiens (human) / References: UniProt: Q13148
Has protein modificationN

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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: DLIIKGISVHI fibril / Type: COMPLEX / Entity ID: all / Source: NATURAL
Molecular weightExperimental value: NO
Source (natural)Organism: Homo sapiens (human)
Buffer solutionpH: 7
Buffer componentName: Water / Formula: H2O
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 295 K

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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 FIELD / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 0.2 sec. / Electron dose: 1.2 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 610
EM imaging opticsEnergyfilter name: GIF Quantum
Image scansMovie frames/image: 50 / Used frames/image: 4-20

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Processing

SoftwareName: PHENIX / Version: 1.10.1_2155: / Classification: refinement
EM software
IDNameVersionCategoryDetails
1EMAN1.9particle selection
2Leginon3.2image acquisition
4CTFFIND4CTF correction
12RELION1.43D reconstruction+IHRSR implementation
13PHENIXmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -120.441 ° / Axial rise/subunit: 1.598 Å / Axial symmetry: C1
3D reconstructionResolution: 3.8 Å / Resolution method: FSC 0.5 CUT-OFF / Num. of particles: 18818 / Algorithm: FOURIER SPACE / Symmetry type: HELICAL
Atomic model buildingProtocol: AB INITIO MODEL / Space: REAL
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00720370
ELECTRON MICROSCOPYf_angle_d0.77127210
ELECTRON MICROSCOPYf_dihedral_angle_d10.10612300
ELECTRON MICROSCOPYf_chiral_restr0.0633840
ELECTRON MICROSCOPYf_plane_restr0.0023060

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