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- EMDB-23626: Cryo-EM Structure of Nucleosome containing mouse histone variant H2A.Z -

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Basic information

Entry
Database: EMDB / ID: EMD-23626
TitleCryo-EM Structure of Nucleosome containing mouse histone variant H2A.Z
Map datacryo-EM map of nucleosome containing histone variant H2A.Z
Sample
  • Complex: Nucleosome core particle containing variant H2A.Z and canonical core histones
    • Complex: Histone H3
      • Protein or peptide: Histone H3
    • Complex: Histone H4
      • Protein or peptide: Histone H4
    • Complex: Histone variant H2A.Z
      • Protein or peptide: Histone H2A.Z
    • Complex: Histone H2B
      • Protein or peptide: Histone H2B 1.1
    • Complex: DNA (136-MER)
      • DNA: DNA (136-MER)
    • Complex: DNA (136-MER)
      • DNA: DNA (136-MER)
Function / homology
Function and homology information


Inhibition of DNA recombination at telomere / Deposition of new CENPA-containing nucleosomes at the centromere / Recognition and association of DNA glycosylase with site containing an affected purine / Condensation of Prophase Chromosomes / Cleavage of the damaged purine / DNA Damage/Telomere Stress Induced Senescence / heterochromatin assembly => GO:0031507 / PRC2 methylates histones and DNA / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / nucleosomal DNA binding ...Inhibition of DNA recombination at telomere / Deposition of new CENPA-containing nucleosomes at the centromere / Recognition and association of DNA glycosylase with site containing an affected purine / Condensation of Prophase Chromosomes / Cleavage of the damaged purine / DNA Damage/Telomere Stress Induced Senescence / heterochromatin assembly => GO:0031507 / PRC2 methylates histones and DNA / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / nucleosomal DNA binding / multicellular organism development / heterochromatin / RNA polymerase II core promoter sequence-specific DNA binding / euchromatin / cellular response to estradiol stimulus / chromatin DNA binding / nucleosome / DNA-templated transcription, initiation / cellular response to insulin stimulus / protein heterodimerization activity / RNA polymerase II cis-regulatory region sequence-specific DNA binding / positive regulation of transcription by RNA polymerase II / DNA binding / nucleus
Similarity search - Function
Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A signature. / Histone H2A conserved site / C-terminus of histone H2A / Histone H2A, C-terminal domain / Histone H2A / Histone 2A / Histone H4 signature. ...Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A signature. / Histone H2A conserved site / C-terminus of histone H2A / Histone H2A, C-terminal domain / Histone H2A / Histone 2A / Histone H4 signature. / Histone H4, conserved site / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Core histone H2A/H2B/H3/H4 / Histone H2A/H2B/H3 / Histone-fold
Similarity search - Domain/homology
Histone H3 / Histone H2B 1.1 / Histone H2A.Z / Histone H4
Similarity search - Component
Biological speciesXenopus laevis (African clawed frog) / Mus musculus (house mouse) / unidentified (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsTan D / Lewis T
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R35GM133611 United States
National Science Foundation (NSF, United States)1942049 United States
CitationJournal: Nucleic Acids Res / Year: 2021
Title: Structural basis of chromatin regulation by histone variant H2A.Z.
Authors: Tyler S Lewis / Vladyslava Sokolova / Harry Jung / Honkit Ng / Dongyan Tan /
Abstract: The importance of histone variant H2A.Z in transcription regulation has been well established, yet its mechanism-of-action remains enigmatic. Conflicting evidence exists in support of both an ...The importance of histone variant H2A.Z in transcription regulation has been well established, yet its mechanism-of-action remains enigmatic. Conflicting evidence exists in support of both an activating and a repressive role of H2A.Z in transcription. Here we report cryo-electron microscopy (cryo-EM) structures of nucleosomes and chromatin fibers containing H2A.Z and those containing canonical H2A. The structures show that H2A.Z incorporation results in substantial structural changes in both nucleosome and chromatin fiber. While H2A.Z increases the mobility of DNA terminus in nucleosomes, it simultaneously enables nucleosome arrays to form a more regular and condensed chromatin fiber. We also demonstrated that H2A.Z's ability to enhance nucleosomal DNA mobility is largely attributed to its characteristic shorter C-terminus. Our study provides the structural basis for H2A.Z-mediated chromatin regulation, showing that the increase flexibility of the DNA termini in H2A.Z nucleosomes is central to its dual-functions in chromatin regulation and in transcription.
History
DepositionMar 15, 2021-
Header (metadata) releaseSep 29, 2021-
Map releaseSep 29, 2021-
UpdateNov 17, 2021-
Current statusNov 17, 2021Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.026
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.026
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-7m1x
  • Surface level: 0.026
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_23626.png

Downloads & links

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Map

FileDownload / File: emd_23626.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Annotationcryo-EM map of nucleosome containing histone variant H2A.Z
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.1 Å/pix.
x 200 pix.
= 220. Å		1.1 Å/pix.
x 200 pix.
= 220. Å		1.1 Å/pix.
x 200 pix.
= 220. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.026 / Movie #1: 0.026
Minimum - Maximum-0.086207405 - 0.14419223
Average (Standard dev.)0.0006208053 (±0.0061237486)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin-100-100-100
Dimensions200200200
Spacing200200200
CellA=B=C: 220.0 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.11.11.1
M x/y/z200200200
origin x/y/z0.0000.0000.000
length x/y/z220.000220.000220.000
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS200200200
D min/max/mean-0.0860.1440.001

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Supplemental data

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Sample components

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Entire : Nucleosome core particle containing variant H2A.Z and canonical c...

EntireName: Nucleosome core particle containing variant H2A.Z and canonical core histones
Components
  • Complex: Nucleosome core particle containing variant H2A.Z and canonical core histones
    • Complex: Histone H3
      • Protein or peptide: Histone H3
    • Complex: Histone H4
      • Protein or peptide: Histone H4
    • Complex: Histone variant H2A.Z
      • Protein or peptide: Histone H2A.Z
    • Complex: Histone H2B
      • Protein or peptide: Histone H2B 1.1
    • Complex: DNA (136-MER)
      • DNA: DNA (136-MER)
    • Complex: DNA (136-MER)
      • DNA: DNA (136-MER)

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Supramolecule #1: Nucleosome core particle containing variant H2A.Z and canonical c...

SupramoleculeName: Nucleosome core particle containing variant H2A.Z and canonical core histones
type: complex / ID: 1 / Parent: 0 / Macromolecule list: all

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Supramolecule #2: Histone H3

SupramoleculeName: Histone H3 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #3
Source (natural)Organism: Xenopus laevis (African clawed frog)
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)

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Supramolecule #3: Histone H4

SupramoleculeName: Histone H4 / type: complex / ID: 3 / Parent: 1 / Macromolecule list: #4
Source (natural)Organism: Xenopus laevis (African clawed frog)
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)

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Supramolecule #4: Histone variant H2A.Z

SupramoleculeName: Histone variant H2A.Z / type: complex / ID: 4 / Parent: 1 / Macromolecule list: #5
Source (natural)Organism: Mus musculus (house mouse)
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)

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Supramolecule #5: Histone H2B

SupramoleculeName: Histone H2B / type: complex / ID: 5 / Parent: 1 / Macromolecule list: #6
Source (natural)Organism: Xenopus laevis (African clawed frog)
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)

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Supramolecule #6: DNA (136-MER)

SupramoleculeName: DNA (136-MER) / type: complex / ID: 6 / Parent: 1 / Macromolecule list: #1
Source (natural)Organism: unidentified (others)
Recombinant expressionOrganism: Escherichia coli DH5[alpha] (bacteria)

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Supramolecule #7: DNA (136-MER)

SupramoleculeName: DNA (136-MER) / type: complex / ID: 7 / Parent: 1 / Macromolecule list: #2
Source (natural)Organism: unidentified (others)
Recombinant expressionOrganism: Escherichia coli DH5[alpha] (bacteria)

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Macromolecule #1: DNA (136-MER)

MacromoleculeName: DNA (136-MER) / type: dna / ID: 1 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: unidentified (others)
Molecular weightTheoretical: 45.604047 KDa
SequenceString: (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) ...String:
(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)

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Macromolecule #2: DNA (136-MER)

MacromoleculeName: DNA (136-MER) / type: dna / ID: 2 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: unidentified (others)
Molecular weightTheoretical: 45.145754 KDa
SequenceString: (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) ...String:
(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)

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Macromolecule #3: Histone H3

MacromoleculeName: Histone H3 / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 15.50719 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
MARTKQTARK STGGKAPRKQ LATKAARKSA PATGEVKKPH RYRPGTVALR EIRRYQKSTE LLIRKLPFQR LVREIAQDFK TDLRFQSSA VMALQEASEA YLVALFEDTN LCAIHAKRVT IMPKDIQLAR RIRGERA

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Macromolecule #4: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 11.394426 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
MSGRGKGGKG LGKGGAKRHR KVLRDNIQGI TKPAIRRLAR RGGVKRISGL IYEETRGVLK VFLENVIRDA VTYTEHAKRK TVTAMDVVY ALKRQGRTLY GFGG

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Macromolecule #5: Histone H2A.Z

MacromoleculeName: Histone H2A.Z / type: protein_or_peptide / ID: 5 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Mus musculus (house mouse)
Molecular weightTheoretical: 13.581796 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
MAGGKAGKDS GKAKTKAVSR SQRAGLQFPV GRIHRHLKSR TTSHGRVGAT AAVYSAAILE YLTAEVLELA GNASKDLKVK RITPRHLQL AIRGDEELDS LIKATIAGGG VIPHIHKSLI GKKGQQKTV

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Macromolecule #6: Histone H2B 1.1

MacromoleculeName: Histone H2B 1.1 / type: protein_or_peptide / ID: 6 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 13.979291 KDa
Recombinant expressionOrganism: Escherichia coli BL21(DE3) (bacteria)
SequenceString:
MPEPAKSAPA PKKGSKKAVT KTQKKDGKKR RKTRKESYAI YVYKVLKQVH PDTGISSKAM SIMNSFVNDV FERIAGEASR LAHYNKRST ITSREIQTAV RLLLPGELAK HAVSEGTKAV TKYTSAK

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

Concentration1 mg/mL
BufferpH: 8
Component:
ConcentrationFormulaName
2.5 mMNaClSodium chloridesodium chloride
10.0 mMTris
2.0 mMEDTAEthylenediaminetetraacetic acidEthylenediaminetetraacetic acid
5.0 mMBME2-mercaptoethanol
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Atmosphere: AIR
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277.15 K / Instrument: FEI VITROBOT MARK IV / Details: blot for 4.5 seconds before plunging.
DetailsThis sample was mono-disperse.

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 50.0 µm / Calibrated magnification: 123811 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 0.8 µm / Nominal magnification: 92000
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: FEI FALCON III (4k x 4k) / Detector mode: COUNTING / Number grids imaged: 3 / Number real images: 1950 / Average exposure time: 60.0 sec. / Average electron dose: 33.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Particle selectionNumber selected: 127778
CTF correctionSoftware - Name: CTFFIND (ver. 4.1.14)
Startup modelType of model: INSILICO MODEL / In silico model: Generated in cryoSPARC
Initial angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1.0)
Final 3D classificationNumber classes: 5 / Software - Name: RELION (ver. 3.1.0)
Final angle assignmentType: MAXIMUM LIKELIHOOD / Software - Name: RELION (ver. 3.1.0)
Final reconstructionNumber classes used: 3 / Applied symmetry - Point group: C1 (asymmetric) / Algorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: RELION (ver. 3.1.0) / Number images used: 42826
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

1f66

chain_id: A

1f66

chain_id: B

1f66

chain_id: C

1f66

chain_id: D

1f66

chain_id: E

1f66

chain_id: F

1f66

chain_id: G

1f66

chain_id: H

6fq5

chain_id: I

6fq5

chain_id: J
RefinementSpace: REAL / Protocol: FLEXIBLE FIT / Target criteria: rmsd
Output model

PDB-7m1x:
Cryo-EM Structure of Nucleosome containing mouse histone variant H2A.Z

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