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- EMDB-47425: Empty Nucleosome with 601 widom sequence -

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Basic information

Entry
Database: EMDB / ID: EMD-47425
TitleEmpty Nucleosome with 601 widom sequence
Map dataEmpty Nucleosome with 601 widom sequence
Sample
  • Complex: Empty Nucleosome with 601 widom sequence
    • Protein or peptide: Histone H3.2
    • Protein or peptide: Histone H4
    • Protein or peptide: Histone H2A type 1
    • Protein or peptide: Histone H2B 1.1
    • DNA: DNA (153-MER)
    • DNA: DNA (153-MER)
KeywordsChromatin / remodelers / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information


structural constituent of chromatin / nucleosome / heterochromatin formation / nucleosome assembly / protein heterodimerization activity / DNA binding / nucleoplasm / nucleus
Similarity search - Function
: / Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A conserved site / Histone H2A signature. / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A ...: / Histone H2B signature. / Histone H2B / Histone H2B / Histone H2A conserved site / Histone H2A signature. / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone H2A / Histone 2A / TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 / Histone-fold
Similarity search - Domain/homology
Histone H2B 1.1 / Histone H2A type 1 / Histone H4 / Histone H3.2
Similarity search - Component
Biological speciesXenopus laevis (African clawed frog) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.6 Å
AuthorsMalik D / Deshmukh AA / Bilokapic S / Halic M
Funding support United States, 2 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R01GM135599-01 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)1R01GM141694-01 United States
CitationJournal: bioRxiv / Year: 2025
Title: Mechanisms of chromatin remodeling by an Snf2-type ATPase.
Authors: Deepshikha Malik / Ashish Deshmukh / Silvija Bilokapic / Mario Halic /
Abstract: Chromatin remodeling enzymes play a crucial role in the organization of chromatin, enabling both stability and plasticity of genome regulation. These enzymes use a Snf2-type ATPase motor to move ...Chromatin remodeling enzymes play a crucial role in the organization of chromatin, enabling both stability and plasticity of genome regulation. These enzymes use a Snf2-type ATPase motor to move nucleosomes, but how they translocate DNA around the histone octamer is unclear. Here we use cryo-EM to visualize the continuous motion of nucleosomal DNA induced by human chromatin remodeler SNF2H, an ISWI family member. Our work reveals conformational changes in SNF2H, DNA and histones during nucleosome sliding and provides the structural basis for DNA translocation. ATP hydrolysis induces conformational changes in SNF2H that pull the DNA tracking strand, distorting DNA and histones at SHL2. This is followed by SNF2H rotation on the nucleosome, which first pulls the DNA guide strand and creates one-base pair bulge at SHL2, and then releases the pulled DNA. Given the high conservation of the catalytic motors among ATP-dependent chromatin remodelers, the mechanisms we describe likely apply to other families.
History
DepositionOct 21, 2024-
Header (metadata) releaseJan 22, 2025-
Map releaseJan 22, 2025-
UpdateMay 28, 2025-
Current statusMay 28, 2025Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_47425.png

Downloads & links

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Map

FileDownload / File: emd_47425.map.gz / Format: CCP4 / Size: 468.3 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationEmpty Nucleosome with 601 widom sequence
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1 Å/pix.
x 497 pix.
= 497. Å		1 Å/pix.
x 497 pix.
= 497. Å		1 Å/pix.
x 497 pix.
= 497. Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 3.79
Minimum - Maximum-1.450377 - 40.294933
Average (Standard dev.)-0.020929221 (±0.30031237)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions497497497
Spacing497497497
CellA=B=C: 497.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: Empty nucleosome Half Map A

Fileemd_47425_half_map_1.map
AnnotationEmpty nucleosome Half Map A
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: empty nucleosome Half Map B

Fileemd_47425_half_map_2.map
Annotationempty nucleosome Half Map B
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Empty Nucleosome with 601 widom sequence

EntireName: Empty Nucleosome with 601 widom sequence
Components
  • Complex: Empty Nucleosome with 601 widom sequence
    • Protein or peptide: Histone H3.2
    • Protein or peptide: Histone H4
    • Protein or peptide: Histone H2A type 1
    • Protein or peptide: Histone H2B 1.1
    • DNA: DNA (153-MER)
    • DNA: DNA (153-MER)

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Supramolecule #1: Empty Nucleosome with 601 widom sequence

SupramoleculeName: Empty Nucleosome with 601 widom sequence / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Xenopus laevis (African clawed frog)

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Macromolecule #1: Histone H3.2

MacromoleculeName: Histone H3.2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 15.421101 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MARTKQTARK STGGKAPRKQ LATKAARKSA PATGGVKKPH RYRPGTVALR EIRRYQKSTE LLIRKLPFQR LVREIAQDFK TDLRFQSSA VMALQEASEA YLVGLFEDTN LCAIHAKRVT IMPKDIQLAR RIRGERA

UniProtKB: Histone H3.2

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Macromolecule #2: Histone H4

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

UniProtKB: Histone H4

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Macromolecule #3: Histone H2A type 1

MacromoleculeName: Histone H2A type 1 / type: protein_or_peptide / ID: 3 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 14.109436 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MSGRGKQGGK TRAKAKTRSS RAGLQFPVGR VHRLLRKGNY AERVGAGAPV YLAAVLEYLT AEILELAGNA ARDNKKTRII PRHLQLAVR NDEELNKLLG RVTIAQGGVL PNIQSVLLPK KTESSKSAKS K

UniProtKB: Histone H2A type 1

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Macromolecule #4: Histone H2B 1.1

MacromoleculeName: Histone H2B 1.1 / type: protein_or_peptide / ID: 4 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Xenopus laevis (African clawed frog)
Molecular weightTheoretical: 13.979291 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
MPEPAKSAPA PKKGSKKAVT KTQKKDGKKR RKTRKESYAI YVYKVLKQVH PDTGISSKAM SIMNSFVNDV FERIAGEASR LAHYNKRST ITSREIQTAV RLLLPGELAK HAVSEGTKAV TKYTSAK

UniProtKB: Histone H2B 1.1

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Macromolecule #5: DNA (153-MER)

MacromoleculeName: DNA (153-MER) / type: dna / ID: 5 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 47.474223 KDa
SequenceString: (DT)(DG)(DC)(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) ...String:
(DT)(DG)(DC)(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)(DG)(DG)(DC)

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Macromolecule #6: DNA (153-MER)

MacromoleculeName: DNA (153-MER) / type: dna / ID: 6 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 46.984922 KDa
SequenceString: (DG)(DC)(DC)(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) ...String:
(DG)(DC)(DC)(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)(DG)(DC)(DA)

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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

BufferpH: 7.5
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 400 / Pretreatment - Type: PLASMA CLEANING / Pretreatment - Time: 45 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 95 % / Chamber temperature: 285.65 K / Instrument: FEI VITROBOT MARK IV

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Electron microscopy

MicroscopeTFS KRIOS
TemperatureMin: 160.0 K / Max: 175.0 K
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Average electron dose: 61.6 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 3.5 µm / Nominal defocus min: 1.5 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: EMDB MAP
EMDB ID:

21970

Final reconstructionResolution.type: BY AUTHOR / Resolution: 2.6 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 562000
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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