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- EMDB-31927: The NBL-DBL module of human chromatin remodeling PBAF-nucleosome ... -

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Basic information

Entry
Database: EMDB / ID: EMD-31927
TitleThe NBL-DBL module of human chromatin remodeling PBAF-nucleosome complex
Map dataThe NBL-DBL module of human chromatin remodeling PBAF-nucleosome complex
Sample
  • Complex: The motor-nucleosome module of human chromatin remodeling PBAF-nucleosome complex
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsChen ZC / Chen KJ / Yuan JJ
Funding support China, 1 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nature / Year: 2022
Title: Structure of human chromatin-remodelling PBAF complex bound to a nucleosome.
Authors: Junjie Yuan / Kangjing Chen / Wenbo Zhang / Zhucheng Chen /
Abstract: DNA wraps around the histone octamer to form nucleosomes, the repeating unit of chromatin, which create barriers for accessing genetic information. Snf2-like chromatin remodellers couple the energy ...DNA wraps around the histone octamer to form nucleosomes, the repeating unit of chromatin, which create barriers for accessing genetic information. Snf2-like chromatin remodellers couple the energy of ATP binding and hydrolysis to reposition and recompose the nucleosome, and have vital roles in various chromatin-based transactions. Here we report the cryo-electron microscopy structure of the 12-subunit human chromatin-remodelling polybromo-associated BRG1-associated factor (PBAF) complex bound to the nucleosome. The motor subunit SMARCA4 engages the nucleosome in the active conformation, which reveals clustering of multiple disease-associated mutations at the interfaces that are essential for chromatin-remodelling activity. SMARCA4 recognizes the H2A-H2B acidic pocket of the nucleosome through three arginine anchors of the Snf2 ATP coupling (SnAc) domain. PBAF shows notable functional modularity, and most of the auxiliary subunits are interwoven into three lobe-like submodules for nucleosome recognition. The PBAF-specific auxiliary subunit ARID2 acts as the structural core for assembly of the DNA-binding lobe, whereas PBRM1, PHF10 and BRD7 are collectively incorporated into the lobe for histone tail binding. Together, our findings provide mechanistic insights into nucleosome recognition by PBAF and a structural basis for understanding SMARCA4-related human diseases.
History
DepositionSep 7, 2021-
Header (metadata) releaseMay 18, 2022-
Map releaseMay 18, 2022-
UpdateMay 18, 2022-
Current statusMay 18, 2022Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_31927.png

Downloads & links

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Map

FileDownload / File: emd_31927.map.gz / Format: CCP4 / Size: 178 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
AnnotationThe NBL-DBL module of human chromatin remodeling PBAF-nucleosome complex
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.08 Å/pix.
x 360 pix.
= 389.7 Å		1.08 Å/pix.
x 360 pix.
= 389.7 Å		1.08 Å/pix.
x 360 pix.
= 389.7 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.0825 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.012
Minimum - Maximum-0.03878427 - 0.086624965
Average (Standard dev.)5.3573658e-05 (±0.0011473357)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions360360360
Spacing360360360
CellA=B=C: 389.69998 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : The motor-nucleosome module of human chromatin remodeling PBAF-nu...

EntireName: The motor-nucleosome module of human chromatin remodeling PBAF-nucleosome complex
Components
  • Complex: The motor-nucleosome module of human chromatin remodeling PBAF-nucleosome complex

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Supramolecule #1: The motor-nucleosome module of human chromatin remodeling PBAF-nu...

SupramoleculeName: The motor-nucleosome module of human chromatin remodeling PBAF-nucleosome complex
type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#7
Source (natural)Organism: Homo sapiens (human)
Recombinant expressionOrganism: Homo sapiens (human)

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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
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: OTHER / Imaging mode: BRIGHT FIELD
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 194109
Initial angle assignmentType: OTHER
Final angle assignmentType: OTHER

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