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- EMDB-25483: 2.9 A structure of the nucleosome-bound ChEx, part of the chromat... -

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Basic information

Entry
Database: EMDB / ID: EMD-25483
Title2.9 A structure of the nucleosome-bound ChEx, part of the chromatin remodeler Chd1
Map dataSharpened 2.9A map with a negative bfactor (-30) in an orientation aligned to a common reference.
Sample
  • Complex: Chd1 ATP-dependent chromatin remodeler bound to a nucleosome in a nucleotide-free state
KeywordsCHD1 / chromatin remodeling / ATPase / DBD / nucleosome / remodeling / transcription / DNA BINDING PROTEIN
Function / homology
Function and homology information


structural constituent of chromatin / nucleosome / heterochromatin formation / nucleosome assembly / protein heterodimerization activity / DNA binding / nucleus
Similarity search - Function
: / Histone H2B signature. / Histone H2A conserved site / Histone H2A signature. / Histone H2B / Histone H2B / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone 2A / Histone H2A ...: / Histone H2B signature. / Histone H2A conserved site / Histone H2A signature. / Histone H2B / Histone H2B / Histone H2A, C-terminal domain / C-terminus of histone H2A / Histone 2A / Histone H2A / 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 domain / Histone-fold
Similarity search - Domain/homology
Histone H2B / Histone H3 / Histone H2A type 1 / Histone H4
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 2.9 Å
AuthorsNodelman IM / Das S / Faustino AM / Fried SD / Bowman GD / Armache J-P
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01-GM084192 United States
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Nucleosome recognition and DNA distortion by the Chd1 remodeler in a nucleotide-free state.
Authors: Ilana M Nodelman / Sayan Das / Anneliese M Faustino / Stephen D Fried / Gregory D Bowman / Jean-Paul Armache /
Abstract: Chromatin remodelers are ATP-dependent enzymes that reorganize nucleosomes within all eukaryotic genomes. Here we report a complex of the Chd1 remodeler bound to a nucleosome in a nucleotide-free ...Chromatin remodelers are ATP-dependent enzymes that reorganize nucleosomes within all eukaryotic genomes. Here we report a complex of the Chd1 remodeler bound to a nucleosome in a nucleotide-free state, determined by cryo-EM to 2.3 Å resolution. The remodeler stimulates the nucleosome to absorb an additional nucleotide on each strand at two different locations: on the tracking strand within the ATPase binding site and on the guide strand one helical turn from the ATPase motor. Remarkably, the additional nucleotide on the tracking strand is associated with a local transformation toward an A-form geometry, explaining how sequential ratcheting of each DNA strand occurs. The structure also reveals a histone-binding motif, ChEx, which can block opposing remodelers on the nucleosome and may allow Chd1 to participate in histone reorganization during transcription.
History
DepositionNov 21, 2021-
Header (metadata) releaseMar 2, 2022-
Map releaseMar 2, 2022-
UpdateJan 17, 2024-
Current statusJan 17, 2024Processing site: RCSB / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.3
  • Imaged by UCSF Chimera
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  • Surface view colored by cylindrical radius
  • Surface level: 0.3
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_25483.png

Downloads & links

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Map

FileDownload / File: emd_25483.map.gz / Format: CCP4 / Size: 125 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationSharpened 2.9A map with a negative bfactor (-30) in an orientation aligned to a common reference.
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.81 Å/pix.
x 320 pix.
= 259.2 Å		0.81 Å/pix.
x 320 pix.
= 259.2 Å		0.81 Å/pix.
x 320 pix.
= 259.2 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.81 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.2 / Movie #1: 0.3
Minimum - Maximum-0.48802137 - 1.5301604
Average (Standard dev.)0.0030511601 (±0.048077326)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions320320320
Spacing320320320
CellA=B=C: 259.2 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z0.810.810.81
M x/y/z320320320
origin x/y/z0.0000.0000.000
length x/y/z259.200259.200259.200
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS320320320
D min/max/mean-0.4881.5300.003

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Supplemental data

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Mask #1

Fileemd_25483_msk_1.map
Projections & Slices
AxesZYX

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Additional map: Unsharpened 2.9A map in an orientation aligned to a common reference.

Fileemd_25483_additional_1.map
AnnotationUnsharpened 2.9A map in an orientation aligned to a common reference.
Projections & Slices
AxesZYX

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Histogram

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Additional map: Unsharpened 2.9A map

Fileemd_25483_additional_2.map
AnnotationUnsharpened 2.9A map
Projections & Slices
AxesZYX

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Histogram (log scale)

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Additional map: Sharpened 2.9A map with a negative bfactor (-30)

Fileemd_25483_additional_3.map
AnnotationSharpened 2.9A map with a negative bfactor (-30)
Projections & Slices
AxesZYX

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Histogram

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Additional map: FSC Mask from cryoSPARC (before auto-tightening)

Fileemd_25483_additional_4.map
AnnotationFSC Mask from cryoSPARC (before auto-tightening)
Projections & Slices
AxesZYX

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Additional map: Refine Mask from cryoSPARC

Fileemd_25483_additional_5.map
AnnotationRefine Mask from cryoSPARC
Projections & Slices
AxesZYX

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Half map: half-map 1 (half A) from cryoSPARC

Fileemd_25483_half_map_1.map
Annotationhalf-map 1 (half_A) from cryoSPARC
Projections & Slices
AxesZYX

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Half map: half-map 2 (half B) from cryoSPARC

Fileemd_25483_half_map_2.map
Annotationhalf-map 2 (half_B) from cryoSPARC
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Sample components

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Entire : Chd1 ATP-dependent chromatin remodeler bound to a nucleosome in a...

EntireName: Chd1 ATP-dependent chromatin remodeler bound to a nucleosome in a nucleotide-free state
Components
  • Complex: Chd1 ATP-dependent chromatin remodeler bound to a nucleosome in a nucleotide-free state

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Supramolecule #1: Chd1 ATP-dependent chromatin remodeler bound to a nucleosome in a...

SupramoleculeName: Chd1 ATP-dependent chromatin remodeler bound to a nucleosome in a nucleotide-free state
type: complex / ID: 1 / Parent: 0 / Details: This entry has a weak DNA-binding domain
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 400 KDa

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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

Concentration1.7 mg/mL
BufferpH: 7
Details: 20 mM HEPES, pH 7.0, 60 mM KCl, 1.5 mM DTT, 1 mM MgCl2
GridModel: Quantifoil R2/2 / Material: COPPER / Mesh: 200 / Support film - Material: CARBON / Support film - topology: HOLEY / Pretreatment - Type: GLOW DISCHARGE / Pretreatment - Time: 10 sec.
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 277 K / Instrument: FEI VITROBOT MARK IV
DetailsNucleosome-bound CHD1, prepared in the presence of ATPgammaS, and then crosslinked using GraFix.

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Specialist opticsEnergy filter - Slit width: 20 eV
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Digitization - Dimensions - Width: 11520 pixel / Digitization - Dimensions - Height: 8184 pixel / Number grids imaged: 1 / Number real images: 6906 / Average exposure time: 3.3 sec. / Average electron dose: 49.9 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Calibrated defocus max: 28.0 µm / Calibrated defocus min: 4.0 µm / Calibrated magnification: 46296 / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: -2.2 µm / Nominal defocus min: -1.0 µm / Nominal magnification: 81000
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

DetailsData collected in Super Resolution at 0.54A/pixel. Motion corrected, 1.5x fourier binned, dose-weighed
Particle selectionNumber selected: 10900948
Startup modelType of model: INSILICO MODEL / In silico model: Ab initio model from cryoSPARC
Final reconstructionAlgorithm: BACK PROJECTION / Resolution.type: BY AUTHOR / Resolution: 2.9 Å / Resolution method: FSC 0.143 CUT-OFF / Software - Name: cryoSPARC (ver. 3.2) / Number images used: 78437
Initial angle assignmentType: PROJECTION MATCHING / Software - Name: cryoSPARC (ver. 3.2)
Final angle assignmentType: PROJECTION MATCHING / Software - Name: cryoSPARC (ver. 3.2)
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial model
PDB IDChain

3lz0

source_name: PDB, initial_model_type: experimental model

3mwy

chain_id: A, source_name: PDB, initial_model_type: experimental model
Detailsphenix.real_space_refine
RefinementSpace: REAL / Protocol: OTHER

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