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- PDB-6fq6: Class 2 : distorted nucleosome -

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Basic information

Entry
Database: PDB / ID: 6fq6
TitleClass 2 : distorted nucleosome
Components
  • (DNA (147-MER)) x 2
  • Histone H2A
  • Histone H2B
  • Histone H4
  • histone H3
KeywordsGENE REGULATION / nucleosome / cryo EM / nucleosome sliding / chromatin remodeling
Function / homology
Function and homology information


DNA-templated transcription, initiation / nucleosome / protein heterodimerization activity / DNA binding / nucleoplasm / nucleus
Histone H4, conserved site / Histone-fold / CENP-T/Histone H4, histone fold / Histone H2A conserved site / Histone H2A, C-terminal domain / Histone H3/CENP-A / Histone H2B / Histone H4 / Histone H2A / TATA box binding protein associated factor (TAF) ...Histone H4, conserved site / Histone-fold / CENP-T/Histone H4, histone fold / Histone H2A conserved site / Histone H2A, C-terminal domain / Histone H3/CENP-A / Histone H2B / Histone H4 / Histone H2A / TATA box binding protein associated factor (TAF) / Histone H2A/H2B/H3 / Histone, subunit A / Histone, subunit A / Orthogonal Bundle / Mainly Alpha
Histone H2B / Histone H2B 1.1 / Histone H2A type 1 / Histone H4 / Histone H3.2 / Histone H2A
Biological speciesXenopus laevis (African clawed frog)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4 Å
AuthorsBilokapic, S. / Halic, M.
Funding support1items
OrganizationGrant numberCountry
European Research CouncilERC-smallRNAhet-309584
CitationJournal: Nat Commun / Year: 2018
Title: Structural rearrangements of the histone octamer translocate DNA.
Authors: Silvija Bilokapic / Mike Strauss / Mario Halic /
Abstract: Nucleosomes, the basic unit of chromatin, package and regulate expression of eukaryotic genomes. Nucleosomes are highly dynamic and are remodeled with the help of ATP-dependent remodeling factors. ...Nucleosomes, the basic unit of chromatin, package and regulate expression of eukaryotic genomes. Nucleosomes are highly dynamic and are remodeled with the help of ATP-dependent remodeling factors. Yet, the mechanism of DNA translocation around the histone octamer is poorly understood. In this study, we present several nucleosome structures showing histone proteins and DNA in different organizational states. We observe that the histone octamer undergoes conformational changes that distort the overall nucleosome structure. As such, rearrangements in the histone core α-helices and DNA induce strain that distorts and moves DNA at SHL 2. Distortion of the nucleosome structure detaches histone α-helices from the DNA, leading to their rearrangement and DNA translocation. Biochemical assays show that cross-linked histone octamers are immobilized on DNA, indicating that structural changes in the octamer move DNA. This intrinsic plasticity of the nucleosome is exploited by chromatin remodelers and might be used by other chromatin machineries.
Validation Report
SummaryFull reportAbout validation report
History
DepositionFeb 13, 2018Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 18, 2018Provider: repository / Type: Initial release
Revision 1.1Oct 23, 2019Group: Data collection / Other / Category: atom_sites / cell
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] ..._atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3] / _cell.Z_PDB

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Structure visualization

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  • EMDB-4298
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Structure viewerMolecule:
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Assembly

Deposited unit
A: histone H3
B: Histone H4
C: Histone H2A
D: Histone H2B
E: histone H3
F: Histone H4
G: Histone H2A
H: Histone H2B
I: DNA (147-MER)
J: DNA (147-MER)


Theoretical massNumber of molelcules
Total (without water)178,71410
Polymers178,71410
Non-polymers00
Water0
1


TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area56300 Å2
ΔGint-388 kcal/mol
Surface area73730 Å2
MethodPISA

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Components

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Protein , 4 types, 8 molecules AEBFCGDH

#1: Protein histone H3 /


Mass: 11560.538 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P84233*PLUS
#2: Protein Histone H4 /


Mass: 9704.396 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Production host: Escherichia coli (E. coli) / References: UniProt: P62799
#3: Protein Histone H2A /


Mass: 12082.128 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Gene: hist1h2aj, LOC494591 / Production host: Escherichia coli (E. coli) / References: UniProt: Q6AZJ8, UniProt: P06897*PLUS
#4: Protein Histone H2B /


Mass: 10635.226 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Xenopus laevis (African clawed frog) / Gene: XELAEV_18032686mg / Production host: Escherichia coli (E. coli) / References: UniProt: A0A1L8FQ56, UniProt: P02281*PLUS

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DNA chain , 2 types, 2 molecules IJ

#5: DNA chain DNA (147-MER)


Mass: 45604.047 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
#6: DNA chain DNA (147-MER)


Mass: 45145.754 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Class 1 : Canonical nucleosomeCOMPLEX#1-#60MULTIPLE SOURCES
2Class 1 : Canonical nucleosomeCOMPLEX#1-#41RECOMBINANT
3Class 1 : Canonical nucleosomeCOMPLEX#5-#61RECOMBINANT
Molecular weightValue: 0.2 MDa
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Xenopus laevis (African clawed frog)8355
33synthetic construct (others)32630
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Escherichia coli (E. coli)562
33Escherichia coli (E. coli)562
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

MicroscopyModel: FEI TITAN
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELDBright-field microscopy
Image recordingElectron dose: 100 e/Å2 / Detector mode: INTEGRATING / Film or detector model: FEI FALCON II (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.11.1_2575: / Classification: refinement
EM softwareName: RELION / Version: 2 / Category: 3D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 58000 / Symmetry type: POINT
Refine LS restraints
Refinement-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00912800
ELECTRON MICROSCOPYf_angle_d1.09718555
ELECTRON MICROSCOPYf_dihedral_angle_d23.4516682
ELECTRON MICROSCOPYf_chiral_restr0.0662120
ELECTRON MICROSCOPYf_plane_restr0.0081326

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