7BXT image
Entry Detail
PDB ID:
7BXT
EMDB ID:
EMD-30237
Keywords:
CELL CYCLE/DNA
Title:
The cryo-EM structure of CENP-A nucleosome in complex with CENP-C peptide and CENP-N N-terminal domain
Biological Source:
Source Organism:
Gallus gallus, Homo sapiens, unidentified cloning vector, synthetic construct
Host Organism:
Escherichia coli BL21(DE3)
PDB Version:
Deposition Date:
2020-04-20
Release Date:
2021-02-10
Method Details:
Experimental Method:
ELECTRON MICROSCOPY
Resolution:
4.20 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
7BXT validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:Histone H3,Histone H3-like centromeric protein A
Chain IDs:A, E
Chain Length:144
Number of Molecules:2
Biological Source:Gallus gallus
UniProt ID:P84229 Pfam ID:PF00125
Protein Blast
Polymer Type:polypeptide(L)
Description:Histone H4
Chain IDs:B, F
Chain Length:106
Number of Molecules:2
Biological Source:Homo sapiens
UniProt ID:P62805 Pfam ID:PF15511
Protein Blast
Polymer Type:polypeptide(L)
Description:Histone H2A type 1-B/E
Chain IDs:C, G
Chain Length:133
Number of Molecules:2
Biological Source:Homo sapiens
UniProt ID:P04908 Pfam ID:PF00125, PF16211
Protein Blast
Polymer Type:polypeptide(L)
Description:Histone H2B type 2-E
Chain IDs:D, H
Chain Length:129
Number of Molecules:2
Biological Source:Homo sapiens
UniProt ID:Q16778 Pfam ID:PF00125
Polymer Type:polydeoxyribonucleotide
Description:DNA (145-mer)
Chain IDs:I
Chain Length:145
Number of Molecules:1
Biological Source:synthetic construct
Polymer Type:polydeoxyribonucleotide
Description:DNA (145-mer)
Chain IDs:J
Chain Length:145
Number of Molecules:1
Biological Source:synthetic construct
Protein Blast
Polymer Type:polypeptide(L)
Description:CENP-C
Chain IDs:K, L
Chain Length:41
Number of Molecules:2
Biological Source:Gallus gallus
UniProt ID:O57392
Protein Blast
Polymer Type:polypeptide(L)
Description:Maltodextrin-binding protein,Centromere protein N
Chain IDs:M, N
Chain Length:630
Number of Molecules:2
Biological Source:unidentified cloning vector, Gallus gallus
UniProt ID:P0AEX9 Pfam ID:PF01547
Ligand Molecules
NA
Primary Citation
Cryo-EM structure of the CENP-A nucleosome in complex with phosphorylated CENP-C.
Embo J. 40 e105671 e105671 (2021)
PMID: 33463726 DOI: 10.15252/embj.2020105671

Abstact

The CENP-A nucleosome is a key structure for kinetochore assembly. Once the CENP-A nucleosome is established in the centromere, additional proteins recognize the CENP-A nucleosome to form a kinetochore. CENP-C and CENP-N are CENP-A binding proteins. We previously demonstrated that vertebrate CENP-C binding to the CENP-A nucleosome is regulated by CDK1-mediated CENP-C phosphorylation. However, it is still unknown how the phosphorylation of CENP-C regulates its binding to CENP-A. It is also not completely understood how and whether CENP-C and CENP-N act together on the CENP-A nucleosome. Here, using cryo-electron microscopy (cryo-EM) in combination with biochemical approaches, we reveal a stable CENP-A nucleosome-binding mode of CENP-C through unique regions. The chicken CENP-C structure bound to the CENP-A nucleosome is stabilized by an intramolecular link through the phosphorylated CENP-C residue. The stable CENP-A-CENP-C complex excludes CENP-N from the CENP-A nucleosome. These findings provide mechanistic insights into the dynamic kinetochore assembly regulated by CDK1-mediated CENP-C phosphorylation.

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Disease

Primary Citation of related structures
7BXT