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- EMDB-35180: Constituent map of cryo-EM structure of BAP1-ASXL1 bound to chrom... -

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Basic information

Entry
Database: EMDB / ID: EMD-35180
TitleConstituent map of cryo-EM structure of BAP1-ASXL1 bound to chromatosome
Map data
Sample
  • Complex: Cryo-EM structure of BAP1-ASXL1 bound to chromatosome
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.0 Å
AuthorsGe W / Yu C / Xu RM
Funding support China, 4 items
OrganizationGrant numberCountry
Ministry of Science and Technology (MoST, China)2019YFA0508900 China
National Natural Science Foundation of China (NSFC)31991162 China
National Natural Science Foundation of China (NSFC)918532204 China
National Natural Science Foundation of China (NSFC)92153302 China
CitationJournal: Nature / Year: 2023
Title: Basis of the H2AK119 specificity of the Polycomb repressive deubiquitinase.
Authors: Weiran Ge / Cong Yu / Jingjing Li / Zhenyu Yu / Xiaorong Li / Yan Zhang / Chao-Pei Liu / Yingfeng Li / Changlin Tian / Xinzheng Zhang / Guohong Li / Bing Zhu / Rui-Ming Xu /
Abstract: Repression of gene expression by protein complexes of the Polycomb group is a fundamental mechanism that governs embryonic development and cell-type specification. The Polycomb repressive ...Repression of gene expression by protein complexes of the Polycomb group is a fundamental mechanism that governs embryonic development and cell-type specification. The Polycomb repressive deubiquitinase (PR-DUB) complex removes the ubiquitin moiety from monoubiquitinated histone H2A K119 (H2AK119ub1) on the nucleosome, counteracting the ubiquitin E3 ligase activity of Polycomb repressive complex 1 (PRC1) to facilitate the correct silencing of genes by Polycomb proteins and safeguard active genes from inadvertent silencing by PRC1 (refs. ). The intricate biological function of PR-DUB requires accurate targeting of H2AK119ub1, but PR-DUB can deubiquitinate monoubiquitinated free histones and peptide substrates indiscriminately; the basis for its exquisite nucleosome-dependent substrate specificity therefore remains unclear. Here we report the cryo-electron microscopy structure of human PR-DUB, composed of BAP1 and ASXL1, in complex with the chromatosome. We find that ASXL1 directs the binding of the positively charged C-terminal extension of BAP1 to nucleosomal DNA and histones H3-H4 near the dyad, an addition to its role in forming the ubiquitin-binding cleft. Furthermore, a conserved loop segment of the catalytic domain of BAP1 is situated near the H2A-H2B acidic patch. This distinct nucleosome-binding mode displaces the C-terminal tail of H2A from the nucleosome surface, and endows PR-DUB with the specificity for H2AK119ub1.
History
DepositionJan 20, 2023-
Header (metadata) releaseFeb 1, 2023-
Map releaseFeb 1, 2023-
UpdateApr 19, 2023-
Current statusApr 19, 2023Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_35180.png

Downloads & links

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Map

FileDownload / File: emd_35180.map.gz / Format: CCP4 / Size: 166.4 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1 Å
Density
Contour LevelBy AUTHOR: 0.28
Minimum - Maximum-1.0124028 - 2.1709385
Average (Standard dev.)-0.0007039124 (±0.048968095)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions352352352
Spacing352352352
CellA=B=C: 352.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_35180_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #2

Fileemd_35180_half_map_2.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Sample components

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Entire : Cryo-EM structure of BAP1-ASXL1 bound to chromatosome

EntireName: Cryo-EM structure of BAP1-ASXL1 bound to chromatosome
Components
  • Complex: Cryo-EM structure of BAP1-ASXL1 bound to chromatosome

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Supramolecule #1: Cryo-EM structure of BAP1-ASXL1 bound to chromatosome

SupramoleculeName: Cryo-EM structure of BAP1-ASXL1 bound to chromatosome / type: complex / ID: 1 / Chimera: Yes / Parent: 0 / Macromolecule list: #1-#10
Source (natural)Organism: 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: 8
VitrificationCryogen name: ETHANE / Chamber humidity: 100 % / Chamber temperature: 284 K

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELDBright-field microscopy / Cs: 2.7 mm / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.5 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Detector mode: SUPER-RESOLUTION / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Initial angle assignmentType: ANGULAR RECONSTITUTION
Final angle assignmentType: ANGULAR RECONSTITUTION
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.0 Å / Resolution method: FSC 0.143 CUT-OFF / Software: (Name: cryoSPARC (ver. 3.2), RELION (ver. 3.0.8)) / Number images used: 95225
FSC plot (resolution estimation)

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Atomic model buiding 1

RefinementSpace: REAL

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