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- EMDB-10155: Class1: CENP-A nucleosome in complex with CENP-C central region -

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Basic information

Entry
Database: EMDB / ID: EMD-10155
TitleClass1: CENP-A nucleosome in complex with CENP-C central region
Map data
SampleCENP-A nucleosome
  • Class1 : CENP-A nucleosome in complex with CENP-C central region
  • DNA
  • Histone H3-like centromeric protein A
  • Histone H4
  • Histone H2A type 2-A
  • Histone H2B type 1-C/E/F/G/I
  • (nucleic-acidNucleic acid) x 2
Function / homology
Function and homology information


condensed chromosome inner kinetochore / kinetochore assembly / protein localization to chromosome, centromeric region / pericentric heterochromatin => GO:0005721 / condensed nuclear chromosome kinetochore / condensed chromosome, centromeric region => GO:0000779 / establishment of mitotic spindle orientation / negative regulation of megakaryocyte differentiation / chromosome, centromeric region / CENP-A containing nucleosome assembly ...condensed chromosome inner kinetochore / kinetochore assembly / protein localization to chromosome, centromeric region / pericentric heterochromatin => GO:0005721 / condensed nuclear chromosome kinetochore / condensed chromosome, centromeric region => GO:0000779 / establishment of mitotic spindle orientation / negative regulation of megakaryocyte differentiation / chromosome, centromeric region / CENP-A containing nucleosome assembly / DNA replication-independent nucleosome assembly / telomere capping / mitotic cytokinesis / chromatin silencing / telomere organization / DNA replication-dependent nucleosome assembly / nucleosome => GO:0000786 / innate immune response in mucosa / rDNA heterochromatin assembly / negative regulation of gene expression, epigenetic / regulation of gene silencing by miRNA / nuclear chromosome / DNA-templated transcription, initiation / regulation of megakaryocyte differentiation / nucleosome assembly / nucleosome / double-strand break repair via nonhomologous end joining / chromatin organization / chromosome, telomeric region => GO:0000781 / antibacterial humoral response / antimicrobial humoral immune response mediated by antimicrobial peptide / protein ubiquitination / protein heterodimerization activity / defense response to Gram-positive bacterium / chromatin => GO:0000785 / protein domain specific binding / chromatin binding / cellular protein metabolic process / viral process / protein-containing complex / RNA binding / DNA binding / extracellular space / extracellular exosome / membrane / extracellular region / nucleoplasm / identical protein binding / nucleus / cytosol
Histone H4 / Histone H2A / Histone H4, conserved site / Histone H2A, C-terminal domain / Histone H2A conserved site / TATA box binding protein associated factor (TAF) / CENP-T/Histone H4, histone fold / Histone H2B / Histone H2A/H2B/H3 / Histone H3/CENP-A / Histone-fold
Histone H3-like centromeric protein A / Histone H4 / Histone H2B type 1-C/E/F/G/I / Histone H2A type 2-A
Biological speciesHomo sapiens (human) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.1 Å
AuthorsAli-Ahmad A / Bilokapic S / Schafer IB / Halic M / Sekulic N
Funding support Norway, Germany, 2 items
OrganizationGrant numberCountry
Research Council of Norway263195 Norway
European Research CouncilERC-smallRNAhet-309584 Germany
CitationJournal: EMBO Rep / Year: 2019
Title: CENP-C unwraps the human CENP-A nucleosome through the H2A C-terminal tail.
Authors: Ahmad Ali-Ahmad / Silvija Bilokapić / Ingmar B Schäfer / Mario Halić / Nikolina Sekulić /
Abstract: Centromeres are defined epigenetically by nucleosomes containing the histone H3 variant CENP-A, upon which the constitutive centromere-associated network of proteins (CCAN) is built. CENP-C is ...Centromeres are defined epigenetically by nucleosomes containing the histone H3 variant CENP-A, upon which the constitutive centromere-associated network of proteins (CCAN) is built. CENP-C is considered to be a central organizer of the CCAN. We provide new molecular insights into the structure of human CENP-A nucleosomes, in isolation and in complex with the CENP-C central region (CENP-C ), the main CENP-A binding module of human CENP-C. We establish that the short αN helix of CENP-A promotes DNA flexibility at the nucleosome ends, independently of the sequence it wraps. Furthermore, we show that, in vitro, two regions of human CENP-C (CENP-C and CENP-C ) both bind exclusively to the CENP-A nucleosome. We find CENP-C to bind with high affinity due to an extended hydrophobic area made up of CENP-A and CENP-A . Importantly, we identify two key conformational changes within the CENP-A nucleosome upon CENP-C binding. First, the loose DNA wrapping of CENP-A nucleosomes is further exacerbated, through destabilization of the H2A C-terminal tail. Second, CENP-C rigidifies the N-terminal tail of H4 in the conformation favoring H4 monomethylation, essential for a functional centromere.
Validation ReportSummary, Full report, XML, About validation report
History
DepositionJul 30, 2019-
Header (metadata) releaseAug 14, 2019-
Map releaseAug 14, 2019-
UpdateNov 6, 2019-
Current statusNov 6, 2019Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.03
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.03
  • Imaged by UCSF Chimera
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  • Surface view with fitted model
  • Atomic models: PDB-6seg
  • Surface level: 0.03
  • Imaged by UCSF Chimera
  • Download
Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

emd_10155.png

Downloads & links

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Map

FileDownload / File: emd_10155.map.gz / Format: CCP4 / Size: 18.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.28 Å/pix.
x 168 pix.
= 215.04 Å		1.28 Å/pix.
x 168 pix.
= 215.04 Å		1.28 Å/pix.
x 168 pix.
= 215.04 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.28 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.03 / Movie #1: 0.03
Minimum - Maximum-0.116205126 - 0.17530152
Average (Standard dev.)0.00019736453 (±0.008075267)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions168168168
Spacing168168168
CellA=B=C: 215.04 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.281.281.28
M x/y/z168168168
origin x/y/z0.0000.0000.000
length x/y/z215.040215.040215.040
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS168168168
D min/max/mean-0.1160.1750.000

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Supplemental data

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Sample components

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Entire CENP-A nucleosome

EntireName: CENP-A nucleosome / Number of components: 9

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Component #1: protein, CENP-A nucleosome

ProteinName: CENP-A nucleosome / Recombinant expression: No

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Component #2: protein, Class1 : CENP-A nucleosome in complex with CENP-C centra...

ProteinName: Class1 : CENP-A nucleosome in complex with CENP-C central region
Recombinant expression: No
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #3: protein, DNA

ProteinName: DNA / Recombinant expression: No
SourceSpecies: synthetic construct (others)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #4: protein, Histone H3-like centromeric protein A

ProteinName: Histone H3-like centromeric protein A / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 16.02363 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #5: protein, Histone H4

ProteinName: Histone H4 / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 11.394426 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #6: protein, Histone H2A type 2-A

ProteinName: Histone H2A type 2-A / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 14.125549 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #7: protein, Histone H2B type 1-C/E/F/G/I

ProteinName: Histone H2B type 1-C/E/F/G/I / Number of Copies: 2 / Recombinant expression: No
MassTheoretical: 13.937213 kDa
SourceSpecies: Homo sapiens (human)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Component #8: nucleic-acid, DNA (145-MER)

nucleic acidName: DNA (145-MER) / Class: DNA / Structure: OTHER / Synthetic: No
Sequence: (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) ...Sequence:
(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)
MassTheoretical: 44.520383 kDa
SourceSpecies: synthetic construct (others)

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Component #9: nucleic-acid, DNA (145-MER)

nucleic acidName: DNA (145-MER) / Class: DNA / Structure: OTHER / Synthetic: No
Sequence: (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) ...Sequence:
(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)
MassTheoretical: 44.99166 kDa
SourceSpecies: synthetic construct (others)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionSpecimen conc.: 1.2 mg/mL / pH: 7.5
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
ImagingMicroscope: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 100 e/Å2 / Illumination mode: FLOOD BEAM
LensImaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Applied symmetry: C1 (asymmetric) / Number of projections: 320000
3D reconstructionResolution: 3.1 Å / Resolution method: FSC 0.143 CUT-OFF

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Atomic model buiding

Output model

6seg

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