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- EMDB-3947: Nucleosome : Class 1 -

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Open data


ID or keywords:

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Basic information

Entry
Database: EMDB / ID: EMD-3947
TitleNucleosome : Class 1
Map data
SampleNucleosome:
HistonesHistone / DNA / Histone H3.2 / Histone H4 / Histone H2A / Histone H2B 1.1 / (nucleic-acidNucleic acid) x 2
Function / homology
Function and homology information


DNA-templated transcription, initiation / nucleosome / protein heterodimerization activity / host cell nucleus / DNA binding / nucleoplasm / nucleus
TATA box binding protein associated factor (TAF) / Histone H2A/H2B/H3 / CENP-T/Histone H4, histone fold / Histone H2A conserved site / Histone H2A, C-terminal domain / Histone H4, conserved site / Histone H3/CENP-A / Histone H2B / Histone H4 / Histone H2A / Histone-fold
Histone H2B 1.1 / Histone H4 / Histone H3.2 / Histone H2A
Biological speciesXenopus laevis (African clawed frog) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsBilokapic S / Halic M
Funding support1 items
OrganizationGrant numberCountry
European Research CouncilERC-smallRNAhet-309584
CitationJournal: Nat. Struct. Mol. Biol. / Year: 2018
Title: Histone octamer rearranges to adapt to DNA unwrapping.
Authors: Silvija Bilokapic / Mike Strauss / Mario Halic /
Abstract: Nucleosomes, the basic units of chromatin, package and regulate expression of eukaryotic genomes. Although the structure of the intact nucleosome is well characterized, little is known about ...Nucleosomes, the basic units of chromatin, package and regulate expression of eukaryotic genomes. Although the structure of the intact nucleosome is well characterized, little is known about structures of partially unwrapped, transient intermediates. In this study, we present nine cryo-EM structures of distinct conformations of nucleosome and subnucleosome particles. These structures show that initial DNA breathing induces conformational changes in the histone octamer, particularly in histone H3, that propagate through the nucleosome and prevent symmetrical DNA opening. Rearrangements in the H2A-H2B dimer strengthen interaction with the unwrapping DNA and promote nucleosome stability. In agreement with this, cross-linked H2A-H2B that cannot accommodate unwrapping of the DNA is not stably maintained in the nucleosome. H2A-H2B release and DNA unwrapping occur simultaneously, indicating that DNA is essential in stabilizing the dimer in the nucleosome. Our structures reveal intrinsic nucleosomal plasticity that is required for nucleosome stability and might be exploited by extrinsic protein factors.
Validation ReportPDB-ID: 6esf

SummaryFull reportAbout validation report
History
DepositionOct 20, 2017-
Header (metadata) releaseOct 25, 2017-
Map releaseDec 20, 2017-
UpdateOct 23, 2019-
Current statusOct 23, 2019Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.075
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.075
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6esf
  • Surface level: 0.075
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_3947.map.gz / Format: CCP4 / Size: 18.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.36 Å/pix.
x 168 pix.
= 228.48 Å
1.36 Å/pix.
x 168 pix.
= 228.48 Å
1.36 Å/pix.
x 168 pix.
= 228.48 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.36 Å
Density
Contour LevelBy AUTHOR: 0.075 / Movie #1: 0.075
Minimum - Maximum-0.15283981 - 0.2645324
Average (Standard dev.)0.0011113364 (±0.011260617)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions168168168
Spacing168168168
CellA=B=C: 228.48 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.361.361.36
M x/y/z168168168
origin x/y/z0.0000.0000.000
length x/y/z228.480228.480228.480
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS168168168
D min/max/mean-0.1530.2650.001

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Supplemental data

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Sample components

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Entire Nucleosome

EntireName: Nucleosome / Number of components: 9

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Component #1: protein, Nucleosome

ProteinName: Nucleosome / Recombinant expression: No
MassTheoretical: 200 kDa

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Component #2: protein, Histones

ProteinName: HistonesHistone / Recombinant expression: No
SourceSpecies: Xenopus laevis (African clawed frog)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #3: protein, DNA

ProteinName: DNA / Recombinant expression: No
SourceSpecies: Synthetic construct (others)
Source (engineered)Expression System: Synthetic construct (others)

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Component #4: protein, Histone H3.2

ProteinName: Histone H3.2 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 15.30393 kDa
SourceSpecies: Xenopus laevis (African clawed frog)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #5: protein, Histone H4

ProteinName: Histone H4 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 11.263231 kDa
SourceSpecies: Xenopus laevis (African clawed frog)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #6: protein, Histone H2A

ProteinName: Histone H2A / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 13.978241 kDa
SourceSpecies: Xenopus laevis (African clawed frog)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #7: protein, Histone H2B 1.1

ProteinName: Histone H2B 1.1 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 13.524752 kDa
SourceSpecies: Xenopus laevis (African clawed frog)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #8: nucleic-acid, DNA (147-MER)

nucleic acidName: DNA (147-MER) / Class: DNA / Structure: OTHER / Synthetic: No
Sequence: (DA)(DC)(DA)(DG)(DG)(DA)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC) (DA)(DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG)(DT)(DA)(DA)(DT)(DC) ...Sequence:
(DA)(DC)(DA)(DG)(DG)(DA)(DT)(DG)(DT)(DA) (DT)(DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC) (DA)(DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG)(DT)(DA)(DA)(DT)(DC)(DC)(DC)(DC)(DT) (DT)(DG)(DG)(DC)(DG)(DG)(DT)(DT)(DA)(DA) (DA)(DA)(DC)(DG)(DC)(DG)(DG)(DG)(DG)(DG) (DA)(DC)(DA)(DG)(DC)(DG)(DC)(DG)(DT)(DA) (DC)(DG)(DT)(DG)(DC)(DG)(DT)(DT)(DT)(DA) (DA)(DG)(DC)(DG)(DG)(DT)(DG)(DC)(DT)(DA) (DG)(DA)(DG)(DC)(DT)(DG)(DT)(DC)(DT)(DA) (DC)(DG)(DA)(DC)(DC)(DA)(DA)(DT)(DT)(DG) (DA)(DG)(DC)(DG)(DG)(DC)(DC)(DT)(DC)(DG) (DG)(DC)(DA)(DC)(DC)(DG)(DG)(DG)(DA)(DT) (DT)(DC)(DT)(DC)(DC)(DA)(DG)
MassTheoretical: 45.604047 kDa
SourceSpecies: synthetic construct (others)

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Component #9: nucleic-acid, DNA (147-MER)

nucleic acidName: DNA (147-MER) / Class: DNA / Structure: OTHER / Synthetic: No
Sequence: (DC)(DT)(DG)(DG)(DA)(DG)(DA)(DA)(DT)(DC) (DC)(DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA) (DG)(DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA)(DC)(DA)(DG)(DC)(DT) ...Sequence:
(DC)(DT)(DG)(DG)(DA)(DG)(DA)(DA)(DT)(DC) (DC)(DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA) (DG)(DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA)(DC)(DA)(DG)(DC)(DT)(DC)(DT)(DA)(DG) (DC)(DA)(DC)(DC)(DG)(DC)(DT)(DT)(DA)(DA) (DA)(DC)(DG)(DC)(DA)(DC)(DG)(DT)(DA)(DC) (DG)(DC)(DG)(DC)(DT)(DG)(DT)(DC)(DC)(DC) (DC)(DC)(DG)(DC)(DG)(DT)(DT)(DT)(DT)(DA) (DA)(DC)(DC)(DG)(DC)(DC)(DA)(DA)(DG)(DG) (DG)(DG)(DA)(DT)(DT)(DA)(DC)(DT)(DC)(DC) (DC)(DT)(DA)(DG)(DT)(DC)(DT)(DC)(DC)(DA) (DG)(DG)(DC)(DA)(DC)(DG)(DT)(DG)(DT)(DC) (DA)(DG)(DA)(DT)(DA)(DT)(DA)(DT)(DA)(DC) (DA)(DT)(DC)(DC)(DT)(DG)(DT)
MassTheoretical: 45.145754 kDa
SourceSpecies: synthetic construct (others)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionpH: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

ImagingMicroscope: FEI TITAN
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 80 e/Å2 / Illumination mode: FLOOD BEAM
LensImaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: C2 (2 fold cyclic) / Number of projections: 55000
3D reconstructionSoftware: RELION / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF

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Atomic model buiding

Output model

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