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- EMDB-33847: Cryo-EM map of Rpd3S:bridge-left arm -

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Basic information

Entry
Database: EMDB / ID: EMD-33847
TitleCryo-EM map of Rpd3S:bridge-left arm
Map data
Sample
  • Complex: Rpd3S complex
KeywordsDynamic Histone Modifications / Gene Regulation / Histone Deacetylase Complex / Assembly and Catalysis.
Biological speciesSaccharomyces cerevisiae S288C (yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.2 Å
AuthorsLi HT / Yan CY / Guan HP / Wang P
Funding support China, 4 items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31725014 China
National Natural Science Foundation of China (NSFC)91753203 China
Ministry of Science and Technology (MoST, China)2020YFA0803300 China
Ministry of Science and Technology (MoST, China)2021YFA1300100 China
CitationJournal: Nature / Year: 2023
Title: Diverse modes of H3K36me3-guided nucleosomal deacetylation by Rpd3S.
Authors: Haipeng Guan / Pei Wang / Pei Zhang / Chun Ruan / Yutian Ou / Bo Peng / Xiangdong Zheng / Jianlin Lei / Bing Li / Chuangye Yan / Haitao Li /
Abstract: Context-dependent dynamic histone modifications constitute a key epigenetic mechanism in gene regulation. The Rpd3 small (Rpd3S) complex recognizes histone H3 trimethylation on lysine 36 (H3K36me3) ...Context-dependent dynamic histone modifications constitute a key epigenetic mechanism in gene regulation. The Rpd3 small (Rpd3S) complex recognizes histone H3 trimethylation on lysine 36 (H3K36me3) and deacetylates histones H3 and H4 at multiple sites across transcribed regions. Here we solved the cryo-electron microscopy structures of Saccharomyces cerevisiae Rpd3S in its free and H3K36me3 nucleosome-bound states. We demonstrated a unique architecture of Rpd3S, in which two copies of Eaf3-Rco1 heterodimers are asymmetrically assembled with Rpd3 and Sin3 to form a catalytic core complex. Multivalent recognition of two H3K36me3 marks, nucleosomal DNA and linker DNAs by Eaf3, Sin3 and Rco1 positions the catalytic centre of Rpd3 next to the histone H4 N-terminal tail for deacetylation. In an alternative catalytic mode, combinatorial readout of unmethylated histone H3 lysine 4 and H3K36me3 by Rco1 and Eaf3 directs histone H3-specific deacetylation except for the registered histone H3 acetylated lysine 9. Collectively, our work illustrates dynamic and diverse modes of multivalent nucleosomal engagement and methylation-guided deacetylation by Rpd3S, highlighting the exquisite complexity of epigenetic regulation with delicately designed multi-subunit enzymatic machineries in transcription and beyond.
History
DepositionJul 14, 2022-
Header (metadata) releaseJun 14, 2023-
Map releaseJun 14, 2023-
UpdateJan 3, 2024-
Current statusJan 3, 2024Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_33847.png

Downloads & links

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Map

FileDownload / File: emd_33847.map.gz / Format: CCP4 / Size: 64 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Voxel sizeX=Y=Z: 1.1 Å
Density
Contour LevelBy AUTHOR: 0.03
Minimum - Maximum-0.12988158 - 0.23090209
Average (Standard dev.)-0.00007808058 (±0.0028355338)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions256256256
Spacing256256256
CellA=B=C: 281.6 Å
α=β=γ: 90.0 °

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Supplemental data

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Half map: #1

Fileemd_33847_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_33847_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 : Rpd3S complex

EntireName: Rpd3S complex
Components
  • Complex: Rpd3S complex

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Supramolecule #1: Rpd3S complex

SupramoleculeName: Rpd3S complex / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #1-#6
Source (natural)Organism: Saccharomyces cerevisiae S288C (yeast)
Molecular weightTheoretical: 523 kDa/nm

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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

Concentration0.7 mg/mL
BufferpH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsCalibrated defocus max: 1.8 µm / Calibrated defocus min: 1.5 µm / Illumination mode: SPOT SCAN / Imaging mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1.8 µm / Nominal defocus min: 1.5 µm
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 50.0 e/Å2
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: NONE
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.2 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 274000
FSC plot (resolution estimation)

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