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- EMDB-62193: Cryo-EM structure of the human CENP-A-H4 octasome. -

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Entry
Database: EMDB / ID: EMD-62193
TitleCryo-EM structure of the human CENP-A-H4 octasome.
Map data
Sample
  • Complex: Cryo-EM structure of human subnucleosome
    • Complex: Histone H3-like centromeric protein A,Histone H4
      • Complex: Widom601 DNA FW (145-MER),Widom601 DNA RW (145-MER)
        • DNA: Widom601 DNA FW (145-MER)
        • DNA: Widom601 DNA RV (145-MER)
      • Protein or peptide: Histone H4
      • Protein or peptide: Histone H3-like centromeric protein A
Keywordssubnucleosome / NUCLEAR PROTEIN / DNA BINDING PROTEIN-DNA complex / DNA BINDING PROTEIN
Function / homology
Function and homology information


CENP-A containing chromatin assembly / kinetochore assembly / protein localization to chromosome, centromeric region / condensed chromosome, centromeric region / pericentric heterochromatin / mitotic cytokinesis / establishment of mitotic spindle orientation / chromosome, centromeric region / negative regulation of megakaryocyte differentiation / protein localization to CENP-A containing chromatin ...CENP-A containing chromatin assembly / kinetochore assembly / protein localization to chromosome, centromeric region / condensed chromosome, centromeric region / pericentric heterochromatin / mitotic cytokinesis / establishment of mitotic spindle orientation / chromosome, centromeric region / negative regulation of megakaryocyte differentiation / protein localization to CENP-A containing chromatin / Replacement of protamines by nucleosomes in the male pronucleus / CENP-A containing nucleosome / Packaging Of Telomere Ends / Amplification of signal from unattached kinetochores via a MAD2 inhibitory signal / Recognition and association of DNA glycosylase with site containing an affected purine / Cleavage of the damaged purine / Deposition of new CENPA-containing nucleosomes at the centromere / Recognition and association of DNA glycosylase with site containing an affected pyrimidine / Cleavage of the damaged pyrimidine / Mitotic Prometaphase / EML4 and NUDC in mitotic spindle formation / telomere organization / Inhibition of DNA recombination at telomere / RNA Polymerase I Promoter Opening / Meiotic synapsis / Assembly of the ORC complex at the origin of replication / Resolution of Sister Chromatid Cohesion / Regulation of endogenous retroelements by the Human Silencing Hub (HUSH) complex / SUMOylation of chromatin organization proteins / DNA methylation / Condensation of Prophase Chromosomes / Chromatin modifications during the maternal to zygotic transition (MZT) / SIRT1 negatively regulates rRNA expression / HCMV Late Events / ERCC6 (CSB) and EHMT2 (G9a) positively regulate rRNA expression / PRC2 methylates histones and DNA / Regulation of endogenous retroelements by KRAB-ZFP proteins / Defective pyroptosis / HDMs demethylate histones / Regulation of endogenous retroelements by Piwi-interacting RNAs (piRNAs) / HDACs deacetylate histones / RNA Polymerase I Promoter Escape / Nonhomologous End-Joining (NHEJ) / Transcriptional regulation by small RNAs / RHO GTPases Activate Formins / Formation of the beta-catenin:TCF transactivating complex / RUNX1 regulates genes involved in megakaryocyte differentiation and platelet function / Activated PKN1 stimulates transcription of AR (androgen receptor) regulated genes KLK2 and KLK3 / G2/M DNA damage checkpoint / NoRC negatively regulates rRNA expression / DNA Damage/Telomere Stress Induced Senescence / B-WICH complex positively regulates rRNA expression / PKMTs methylate histone lysines / Meiotic recombination / Pre-NOTCH Transcription and Translation / RMTs methylate histone arginines / Activation of anterior HOX genes in hindbrain development during early embryogenesis / Transcriptional regulation of granulopoiesis / Separation of Sister Chromatids / HCMV Early Events / structural constituent of chromatin / Recruitment and ATM-mediated phosphorylation of repair and signaling proteins at DNA double strand breaks / nucleosome / RUNX1 regulates transcription of genes involved in differentiation of HSCs / nucleosome assembly / Processing of DNA double-strand break ends / HATs acetylate histones / Senescence-Associated Secretory Phenotype (SASP) / chromatin organization / MLL4 and MLL3 complexes regulate expression of PPARG target genes in adipogenesis and hepatic steatosis / Oxidative Stress Induced Senescence / Estrogen-dependent gene expression / chromosome, telomeric region / Amyloid fiber formation / protein heterodimerization activity / chromatin binding / protein-containing complex / DNA binding / RNA binding / extracellular exosome / extracellular region / nucleoplasm / nucleus / membrane / cytosol
Similarity search - Function
TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / Histone H3 signature 2. / Histone H3 ...TATA box binding protein associated factor / TATA box binding protein associated factor (TAF), histone-like fold domain / Histone H4, conserved site / Histone H4 signature. / Histone H4 / Histone H4 / CENP-T/Histone H4, histone fold / Centromere kinetochore component CENP-T histone fold / 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
Histone H3-like centromeric protein A / Histone H4
Similarity search - Component
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.66 Å
AuthorsNozawa K / Takizawa Y / Kurumizaka H
Funding support Japan, 6 items
OrganizationGrant numberCountry
Japan Science and TechnologyJPMJER1901 Japan
Japan Science and TechnologyJPMJFR224Z Japan
Japan Society for the Promotion of Science (JSPS)23H02519 Japan
Japan Society for the Promotion of Science (JSPS)JP22K06098 Japan
Japan Agency for Medical Research and Development (AMED)JP24ama121009 Japan
Japan Agency for Medical Research and Development (AMED)JP24ama121003 Japan
CitationJournal: Genes Cells / Year: 2025
Title: Cryo-EM Analysis of a Unique Subnucleosome Containing Centromere-Specific Histone Variant CENP-A.
Authors: Osamu Kawasaki / Yoshimasa Takizawa / Iori Kiyokawa / Hitoshi Kurumizaka / Kayo Nozawa /
Abstract: In eukaryotes, genomic DNA is stored in the nucleus as nucleosomes, in which a DNA segment is wrapped around a protein octamer consisting of two each of the four histones, H2A, H2B, H3, and H4. The ...In eukaryotes, genomic DNA is stored in the nucleus as nucleosomes, in which a DNA segment is wrapped around a protein octamer consisting of two each of the four histones, H2A, H2B, H3, and H4. The core histones can be replaced by histone variants or altered with covalent modifications, contributing to the regulation of chromosome structure and nuclear activities. The formation of an octameric histone core in nucleosomes is widely accepted. Recently, the H3-H4 octasome, a novel nucleosome-like structure with a histone octamer consisting solely of H3 and H4, has been reported. CENP-A is the centromere-specific histone H3 variant and determines the position of kinetochore assembly during mitosis. CENP-A is a distant H3 variant sharing approximately 50% amino acid sequence with H3. In this study, we found that CENP-A and H4 also formed an octamer without H2A and H2B in vitro. We determined the structure of the CENP-A-H4 octasome at 3.66 Å resolution. In the CENP-A-H4 octasome, an approximately 120-base pair DNA segment was wrapped around the CENP-A-H4 octameric core and displayed the four CENP-A RG-loops, which are the direct binding sites for another centromeric protein, CENP-N.
History
DepositionOct 27, 2024-
Header (metadata) releaseApr 30, 2025-
Map releaseApr 30, 2025-
UpdateJun 25, 2025-
Current statusJun 25, 2025Processing site: PDBj / Status: Released

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Structure visualization

Supplemental images

emd_62193.png

Downloads & links

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Map

FileDownload / File: emd_62193.map.gz / Format: CCP4 / Size: 30.5 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
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AxesZ (Sec.)Y (Row.)X (Col.)
1.06 Å/pix.
x 200 pix.
= 212. Å		1.06 Å/pix.
x 200 pix.
= 212. Å		1.06 Å/pix.
x 200 pix.
= 212. Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.06 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.03
Minimum - Maximum-0.15014449 - 0.24507278
Average (Standard dev.)0.00045821173 (±0.006048653)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions200200200
Spacing200200200
CellA=B=C: 211.99998 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_62193_msk_1.map
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Additional map: #1

Fileemd_62193_additional_1.map
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Half map: #2

Fileemd_62193_half_map_1.map
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Half map: #1

Fileemd_62193_half_map_2.map
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Sample components

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Entire : Cryo-EM structure of human subnucleosome

EntireName: Cryo-EM structure of human subnucleosome
Components
  • Complex: Cryo-EM structure of human subnucleosome
    • Complex: Histone H3-like centromeric protein A,Histone H4
      • Complex: Widom601 DNA FW (145-MER),Widom601 DNA RW (145-MER)
        • DNA: Widom601 DNA FW (145-MER)
        • DNA: Widom601 DNA RV (145-MER)
      • Protein or peptide: Histone H4
      • Protein or peptide: Histone H3-like centromeric protein A

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Supramolecule #1: Cryo-EM structure of human subnucleosome

SupramoleculeName: Cryo-EM structure of human subnucleosome / type: complex / ID: 1 / Parent: 0 / Macromolecule list: #2-#4, #1

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Supramolecule #2: Histone H3-like centromeric protein A,Histone H4

SupramoleculeName: Histone H3-like centromeric protein A,Histone H4 / type: complex / ID: 2 / Parent: 1 / Macromolecule list: #2, #1
Source (natural)Organism: Homo sapiens (human)

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Supramolecule #3: Widom601 DNA FW (145-MER),Widom601 DNA RW (145-MER)

SupramoleculeName: Widom601 DNA FW (145-MER),Widom601 DNA RW (145-MER) / type: complex / ID: 3 / Parent: 2 / Macromolecule list: #3-#4
Source (natural)Organism: synthetic construct (others)

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Macromolecule #1: Histone H3-like centromeric protein A

MacromoleculeName: Histone H3-like centromeric protein A / type: protein_or_peptide / ID: 1 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 16.305906 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
GSHMGPRRRS RKPEAPRRRS PSPTPTPGPS RRGPSLGASS HQHSRRRQGW LKEIRKLQKS THLLIRKLPF SRLAREICVK FTRGVDFNW QAQALLALQE AAEAFLVHLF EDAYLLTLHA GRVTLFPKDV QLARRIRGLE EGLG

UniProtKB: Histone H3-like centromeric protein A

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Macromolecule #2: Histone H4

MacromoleculeName: Histone H4 / type: protein_or_peptide / ID: 2 / Number of copies: 4 / Enantiomer: LEVO
Source (natural)Organism: Homo sapiens (human)
Molecular weightTheoretical: 11.676703 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString:
GSHMSGRGKG GKGLGKGGAK RHRKVLRDNI QGITKPAIRR LARRGGVKRI SGLIYEETRG VLKVFLENVI RDAVTYTEHA KRKTVTAMD VVYALKRQGR TLYGFGG

UniProtKB: Histone H4

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Macromolecule #3: Widom601 DNA FW (145-MER)

MacromoleculeName: Widom601 DNA FW (145-MER) / type: dna / ID: 3 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 44.520383 KDa
SequenceString: (DA)(DT)(DC)(DA)(DG)(DA)(DA)(DT)(DC)(DC) (DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA)(DG) (DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA) (DC)(DA)(DG)(DC)(DT)(DC) ...String:
(DA)(DT)(DC)(DA)(DG)(DA)(DA)(DT)(DC)(DC) (DC)(DG)(DG)(DT)(DG)(DC)(DC)(DG)(DA)(DG) (DG)(DC)(DC)(DG)(DC)(DT)(DC)(DA)(DA) (DT)(DT)(DG)(DG)(DT)(DC)(DG)(DT)(DA)(DG) (DA) (DC)(DA)(DG)(DC)(DT)(DC)(DT)(DA) (DG)(DC)(DA)(DC)(DC)(DG)(DC)(DT)(DT)(DA) (DA)(DA) (DC)(DG)(DC)(DA)(DC)(DG)(DT) (DA)(DC)(DG)(DC)(DG)(DC)(DT)(DG)(DT)(DC) (DC)(DC)(DC) (DC)(DG)(DC)(DG)(DT)(DT) (DT)(DT)(DA)(DA)(DC)(DC)(DG)(DC)(DC)(DA) (DA)(DG)(DG)(DG) (DG)(DA)(DT)(DT)(DA) (DC)(DT)(DC)(DC)(DC)(DT)(DA)(DG)(DT)(DC) (DT)(DC)(DC)(DA)(DG) (DG)(DC)(DA)(DC) (DG)(DT)(DG)(DT)(DC)(DA)(DG)(DA)(DT)(DA) (DT)(DA)(DT)(DA)(DC)(DA) (DT)(DC)(DG) (DA)(DT)

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Macromolecule #4: Widom601 DNA RV (145-MER)

MacromoleculeName: Widom601 DNA RV (145-MER) / type: dna / ID: 4 / Number of copies: 1 / Classification: DNA
Source (natural)Organism: synthetic construct (others)
Molecular weightTheoretical: 44.99166 KDa
SequenceString: (DA)(DT)(DC)(DG)(DA)(DT)(DG)(DT)(DA)(DT) (DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC)(DA) (DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG) (DT)(DA)(DA)(DT)(DC)(DC) ...String:
(DA)(DT)(DC)(DG)(DA)(DT)(DG)(DT)(DA)(DT) (DA)(DT)(DA)(DT)(DC)(DT)(DG)(DA)(DC)(DA) (DC)(DG)(DT)(DG)(DC)(DC)(DT)(DG)(DG) (DA)(DG)(DA)(DC)(DT)(DA)(DG)(DG)(DG)(DA) (DG) (DT)(DA)(DA)(DT)(DC)(DC)(DC)(DC) (DT)(DT)(DG)(DG)(DC)(DG)(DG)(DT)(DT)(DA) (DA)(DA) (DA)(DC)(DG)(DC)(DG)(DG)(DG) (DG)(DG)(DA)(DC)(DA)(DG)(DC)(DG)(DC)(DG) (DT)(DA)(DC) (DG)(DT)(DG)(DC)(DG)(DT) (DT)(DT)(DA)(DA)(DG)(DC)(DG)(DG)(DT)(DG) (DC)(DT)(DA)(DG) (DA)(DG)(DC)(DT)(DG) (DT)(DC)(DT)(DA)(DC)(DG)(DA)(DC)(DC)(DA) (DA)(DT)(DT)(DG)(DA) (DG)(DC)(DG)(DG) (DC)(DC)(DT)(DC)(DG)(DG)(DC)(DA)(DC)(DC) (DG)(DG)(DG)(DA)(DT)(DT) (DC)(DT)(DG) (DA)(DT)

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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
GridModel: Quantifoil R1.2/1.3 / Material: COPPER / Mesh: 200 / Pretreatment - Type: GLOW DISCHARGE
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeTFS KRIOS
Specialist opticsEnergy filter - Name: GIF Bioquantum / Energy filter - Slit width: 25 eV
Image recordingFilm or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Number grids imaged: 1 / Average exposure time: 6.0 sec. / Average electron dose: 57.3 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsC2 aperture diameter: 100.0 µm / Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Cs: 2.7 mm / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.25 µm
Sample stageSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Cooling holder cryogen: NITROGEN
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

7x57

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.66 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 120247
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD
FSC plot (resolution estimation)

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Atomic model buiding 1

Initial modelPDB ID:

7x57


Chain - Source name: PDB / Chain - Initial model type: experimental model
RefinementSpace: REAL / Protocol: FLEXIBLE FIT
Output model

PDB-9k9l:
Cryo-EM structure of the human CENP-A-H4 octasome.

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