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- EMDB-34056: histone methyltransferase -

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Basic information

Entry
Database: EMDB / ID: EMD-34056
Titlehistone methyltransferase
Map data
Sample
  • Complex: histone methyltransferase and nucleosome complex
Keywordshistone methyltransferase / GENE REGULATION
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 5.1 Å
AuthorsLi H / Wang WY
Funding support China, 1 items
OrganizationGrant numberCountry
National Science Foundation (NSF, China)XDB37010100 China
CitationJournal: Mol Cell / Year: 2023
Title: Structural insight into H4K20 methylation on H2A.Z-nucleosome by SUV420H1.
Authors: Li Huang / Youwang Wang / Haizhen Long / Haoqiang Zhu / Zengqi Wen / Liwei Zhang / Wenhao Zhang / Zhenqian Guo / Longge Wang / Fangyi Tang / Jie Hu / Keyan Bao / Ping Zhu / Guohong Li / Zheng Zhou /
Abstract: DNA replication ensures the accurate transmission of genetic information during the cell cycle. Histone variant H2A.Z is crucial for early replication origins licensing and activation in which ...DNA replication ensures the accurate transmission of genetic information during the cell cycle. Histone variant H2A.Z is crucial for early replication origins licensing and activation in which SUV420H1 preferentially recognizes H2A.Z-nucleosome and deposits H4 lysine 20 dimethylation (H4K20me2) on replication origins. Here, we report the cryo-EM structures of SUV420H1 bound to H2A.Z-nucleosome or H2A-nucleosome and demonstrate that SUV420H1 directly interacts with H4 N-terminal tail, the DNA, and the acidic patch in the nucleosome. The H4 (1-24) forms a lasso-shaped structure that stabilizes the SUV420H1-nucleosome complex and precisely projects the H4K20 residue into the SUV420H1 catalytic center. In vitro and in vivo analyses reveal a crucial role of the SUV420H1 KR loop (residues 214-223), which lies close to the H2A.Z-specific residues D97/S98, in H2A.Z-nucleosome preferential recognition. Together, our findings elucidate how SUV420H1 recognizes nucleosomes to ensure site-specific H4K20me2 modification and provide insights into how SUV420H1 preferentially recognizes H2A.Z nucleosome.
History
DepositionAug 9, 2022-
Header (metadata) releaseAug 16, 2023-
Map releaseAug 16, 2023-
UpdateSep 13, 2023-
Current statusSep 13, 2023Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_34056.png

Downloads & links

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Map

FileDownload / File: emd_34056.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1 Å
Density
Contour LevelBy AUTHOR: 0.014
Minimum - Maximum-0.006526546 - 0.04013214
Average (Standard dev.)0.00094172504 (±0.0033111575)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 200.0 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #2

Fileemd_34056_half_map_1.map
Projections & Slices
AxesZYX

Projections

Slices (1/2)
Density Histograms

Histogram

Histogram (log scale)

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Half map: #1

Fileemd_34056_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 : histone methyltransferase and nucleosome complex

EntireName: histone methyltransferase and nucleosome complex
Components
  • Complex: histone methyltransferase and nucleosome complex

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Supramolecule #1: histone methyltransferase and nucleosome complex

SupramoleculeName: histone methyltransferase and nucleosome complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#9
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: 7
VitrificationCryogen name: ETHANE

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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 / Nominal defocus max: 2.3000000000000003 µm / Nominal defocus min: 1.8 µm
Image recordingFilm or detector model: GATAN K2 SUMMIT (4k x 4k) / Average electron dose: 60.0 e/Å2
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Startup modelType of model: OTHER
Initial angle assignmentType: RANDOM ASSIGNMENT
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 5.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 127400

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