6SEG

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


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.5 of the entry. See complete history


Literature

CENP-C unwraps the human CENP-A nucleosome through the H2A C-terminal tail.

Ali-Ahmad, A.Bilokapic, S.Schafer, I.B.Halic, M.Sekulic, N.

(2019) EMBO Rep 20: e48913-e48913

  • DOI: https://doi.org/10.15252/embr.201948913
  • Primary Citation of Related Structures:  
    6SE0, 6SE6, 6SEE, 6SEF, 6SEG

  • PubMed 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 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 CR ), 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 CR and CENP-C motif ) both bind exclusively to the CENP-A nucleosome. We find CENP-C CR to bind with high affinity due to an extended hydrophobic area made up of CENP-A V 532 and CENP-A V 533 . 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 CR rigidifies the N-terminal tail of H4 in the conformation favoring H4 K20 monomethylation, essential for a functional centromere.


  • Organizational Affiliation

    Centre for Molecular Medicine Norway (NCMM), Nordic EMBL Partnership, University of Oslo, Oslo, Norway.


Macromolecules

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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H3-like centromeric protein A
A, E
140Homo sapiensMutation(s): 0 
Gene Names: CENPA
UniProt & NIH Common Fund Data Resources
Find proteins for P49450 (Homo sapiens)
Explore P49450 
Go to UniProtKB:  P49450
PHAROS:  P49450
GTEx:  ENSG00000115163 
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UniProt GroupP49450
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H4
B, F
103Homo sapiensMutation(s): 0 
Gene Names: 
UniProt & NIH Common Fund Data Resources
Find proteins for P62805 (Homo sapiens)
Explore P62805 
Go to UniProtKB:  P62805
PHAROS:  P62805
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UniProt GroupP62805
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2A type 2-A
C, G
130Homo sapiensMutation(s): 0 
Gene Names: HIST2H2AA3H2AFOHIST2H2AAHIST2H2AA4
UniProt & NIH Common Fund Data Resources
Find proteins for Q6FI13 (Homo sapiens)
Explore Q6FI13 
Go to UniProtKB:  Q6FI13
PHAROS:  Q6FI13
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UniProt GroupQ6FI13
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
Histone H2B type 1-C/E/F/G/I
D, H
126Homo sapiensMutation(s): 0 
Gene Names: HIST1H2BCH2BFLHIST1H2BEH2BFHHIST1H2BFH2BFGHIST1H2BGH2BFAHIST1H2BIH2BFK
UniProt & NIH Common Fund Data Resources
Find proteins for P62807 (Homo sapiens)
Explore P62807 
Go to UniProtKB:  P62807
PHAROS:  P62807
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UniProt GroupP62807
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Entity ID: 5
MoleculeChains LengthOrganismImage
DNA (145-MER)145synthetic construct
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Entity ID: 6
MoleculeChains LengthOrganismImage
DNA (145-MER)145synthetic construct
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Research Council of NorwayNorway263195
European Research CouncilGermanyERC-smallRNAhet-309584

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-14
    Type: Initial release
  • Version 1.1: 2019-09-11
    Changes: Data collection, Database references
  • Version 1.2: 2019-10-16
    Changes: Data collection, Database references
  • Version 1.3: 2019-10-23
    Changes: Author supporting evidence, Data collection
  • Version 1.4: 2019-11-06
    Changes: Data collection, Refinement description
  • Version 1.5: 2024-05-22
    Changes: Data collection, Database references