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- PDB-7yoz: Cryo-EM structure of human subnucleosome (intermediate form) -

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Basic information

Entry
Database: PDB / ID: 7yoz
TitleCryo-EM structure of human subnucleosome (intermediate form)
Components
  • Histone H3.1
  • Histone H4
  • Widom601 DNA FW (145-MER)
  • Widom601 DNA RV (145-MER)
KeywordsDNA BINDING PROTEIN/DNA / subnucleosome / NUCLEAR PROTEIN / DNA BINDING PROTEIN-DNA complex
Function / homology
Function and homology information


arachidonate 15-lipoxygenase / arachidonate 15-lipoxygenase activity / lipoxygenase pathway / telomere organization / arachidonate metabolic process / Chromatin modifying enzymes / lipid oxidation / hepoxilin biosynthetic process / linoleic acid metabolic process / RNA Polymerase I Promoter Opening ...arachidonate 15-lipoxygenase / arachidonate 15-lipoxygenase activity / lipoxygenase pathway / telomere organization / arachidonate metabolic process / Chromatin modifying enzymes / lipid oxidation / hepoxilin biosynthetic process / linoleic acid metabolic process / RNA Polymerase I Promoter Opening / Assembly of the ORC complex at the origin of replication / Interleukin-7 signaling / epigenetic regulation of gene expression / DNA methylation / Condensation of Prophase Chromosomes / HCMV Late Events / SIRT1 negatively regulates rRNA expression / Chromatin modifications during the maternal to zygotic transition (MZT) / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / PRC2 methylates histones and DNA / Defective pyroptosis / Meiotic recombination / HDACs deacetylate histones / RNA Polymerase I Promoter Escape / Transcriptional regulation by small RNAs / Transcriptional regulation of granulopoiesis / HDMs demethylate histones / Formation of the beta-catenin:TCF transactivating complex / HCMV Early Events / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / NoRC negatively regulates rRNA expression / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / PKMTs methylate histone lysines / B-WICH complex positively regulates rRNA expression / RMTs methylate histone arginines / Pre-NOTCH Transcription and Translation / Activation of anterior HOX genes in hindbrain development during early embryogenesis / structural constituent of chromatin / nucleosome / Factors involved in megakaryocyte development and platelet production / nucleosome assembly / chromatin organization / Senescence-Associated Secretory Phenotype (SASP) / RUNX1 regulates transcription of genes involved in differentiation of HSCs / HATs acetylate histones / gene expression / Oxidative Stress Induced Senescence / Estrogen-dependent gene expression / cadherin binding / protein heterodimerization activity / Amyloid fiber formation / protein-containing complex / DNA binding / extracellular exosome / extracellular region / nucleoplasm / membrane / nucleus / metal ion binding
Similarity search - Function
Lipoxygenase, iron binding site / Lipoxygenases iron-binding region signature 1. / Lipoxygenase / Lipoxygenase, C-terminal / Lipoxigenase, C-terminal domain superfamily / Lipoxygenase / Lipoxygenase iron-binding catalytic domain profile. / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 ...Lipoxygenase, iron binding site / Lipoxygenases iron-binding region signature 1. / Lipoxygenase / Lipoxygenase, C-terminal / Lipoxigenase, C-terminal domain superfamily / Lipoxygenase / Lipoxygenase iron-binding catalytic domain profile. / Histone H3 signature 1. / Histone H3 signature 2. / Histone H3 / Histone H3/CENP-A / Histone H2A/H2B/H3 / Core histone H2A/H2B/H3/H4 / Histone-fold
Similarity search - Domain/homology
DNA / DNA (> 10) / DNA (> 100) / Arachidonate 15-lipoxygenase / Histone H3.1
Similarity search - Component
Biological speciesHomo sapiens (human)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsNozawa, K. / Takizawa, Y. / Kurumizaka, H.
Funding support Japan, 5items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)JP20H00449 Japan
Japan Society for the Promotion of Science (JSPS)JP20K06599 Japan
Japan Society for the Promotion of Science (JSPS)JP21H05154 Japan
Japan Science and TechnologyJPMJPR18K9 Japan
Japan Science and TechnologyJPMJER1901 Japan
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Cryo-electron microscopy structure of the H3-H4 octasome: A nucleosome-like particle without histones H2A and H2B.
Authors: Kayo Nozawa / Yoshimasa Takizawa / Leonidas Pierrakeas / Chizuru Sogawa-Fujiwara / Kazumi Saikusa / Satoko Akashi / Ed Luk / Hitoshi Kurumizaka /
Abstract: The canonical nucleosome, which represents the major packaging unit of eukaryotic chromatin, has an octameric core composed of two histone H2A-H2B and H3-H4 dimers with ∼147 base pairs (bp) of DNA ...The canonical nucleosome, which represents the major packaging unit of eukaryotic chromatin, has an octameric core composed of two histone H2A-H2B and H3-H4 dimers with ∼147 base pairs (bp) of DNA wrapped around it. Non-nucleosomal particles with alternative histone stoichiometries and DNA wrapping configurations have been found, and they could profoundly influence genome architecture and function. Using cryo-electron microscopy, we solved the structure of the H3-H4 octasome, a nucleosome-like particle with a di-tetrameric core consisting exclusively of the H3 and H4 histones. The core is wrapped by ∼120 bp of DNA in 1.5 negative superhelical turns, forming two stacked disks that are connected by a H4-H4' four-helix bundle. Three conformations corresponding to alternative interdisk angles were observed, indicating the flexibility of the H3-H4 octasome structure. In vivo crosslinking experiments detected histone-histone interactions consistent with the H3-H4 octasome model, suggesting that H3-H4 octasomes or related structural features exist in cells.
History
DepositionAug 2, 2022Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Nov 16, 2022Provider: repository / Type: Initial release
Revision 1.1Jul 3, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / em_admin / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type / _em_admin.last_update

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: Histone H3.1
B: Histone H4
C: Histone H3.1
D: Histone H4
E: Histone H3.1
F: Histone H4
G: Histone H3.1
H: Histone H4
I: Widom601 DNA FW (145-MER)
J: Widom601 DNA RV (145-MER)


Theoretical massNumber of molelcules
Total (without water)199,09710
Polymers199,09710
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein
Histone H3.1 / Histone H3/a / Histone H3/b / Histone H3/c / Histone H3/d / Histone H3/f / Histone H3/h / Histone ...Histone H3/a / Histone H3/b / Histone H3/c / Histone H3/d / Histone H3/f / Histone H3/h / Histone H3/i / Histone H3/j / Histone H3/k / Histone H3/l


Mass: 15719.445 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H3C1 / Production host: Escherichia coli (E. coli) / References: UniProt: P68431
#2: Protein
Histone H4


Mass: 11676.703 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: H4C1 / Production host: Escherichia coli (E. coli) / References: UniProt: P62805
#3: DNA chain Widom601 DNA FW (145-MER)


Mass: 44520.383 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
#4: DNA chain Widom601 DNA RV (145-MER)


Mass: 44991.660 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

Component
IDNameTypeEntity IDParent-IDSource
1Cryo-EM structure of human subnucleosome (intermediate form)COMPLEXall0RECOMBINANT
2Histone H3.1,Histone H4COMPLEX#1-#21RECOMBINANT
3Widom601 DNA FW (145-MER),Widom601 DNA RV (145-MER)COMPLEX#3-#41RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Homo sapiens (human)9606
33synthetic construct (others)32630
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Escherichia coli (E. coli)562
33Escherichia coli (E. coli)562
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 1250 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm / Alignment procedure: BASIC
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 0.15 sec. / Electron dose: 1.56 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of grids imaged: 1
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 25 eV

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Processing

SoftwareName: PHENIX / Version: 1.18rc3_3805: / Classification: refinement
EM softwareName: SerialEM / Category: image acquisition
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 104987 / Symmetry type: POINT
Atomic model buildingProtocol: FLEXIBLE FIT / Space: REAL
Atomic model buildingPDB-ID: 3LZ0

3lz0


Accession code: 3LZ0 / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00310403
ELECTRON MICROSCOPYf_angle_d0.52915068
ELECTRON MICROSCOPYf_dihedral_angle_d35.7093094
ELECTRON MICROSCOPYf_chiral_restr0.0321723
ELECTRON MICROSCOPYf_plane_restr0.0041069

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