8PPR image
Entry Detail
PDB ID:
8PPR
EMDB ID:
Keywords:
Title:
Structure of the human outer kinetochore KMN network complex
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2023-07-08
Release Date:
2024-03-20
Method Details:
Experimental Method:
Resolution:
3.00 Å
Aggregation State:
PARTICLE
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Kinetochore-associated protein DSN1 homolog
Chain IDs:A (auth: D)
Chain Length:356
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Kinetochore protein Spc24
Chain IDs:E (auth: F)
Chain Length:197
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Kinetochore protein Spc25
Chain IDs:F (auth: G)
Chain Length:224
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Kinetochore scaffold 1
Chain IDs:G (auth: K)
Chain Length:2342
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Protein MIS12 homolog
Chain IDs:B (auth: M)
Chain Length:205
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Kinetochore-associated protein NSL1 homolog
Chain IDs:C (auth: N)
Chain Length:281
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:Polyamine-modulated factor 1
Chain IDs:D (auth: P)
Chain Length:205
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:ZW10 interactor
Chain IDs:H (auth: Z)
Chain Length:277
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Structure of the human outer kinetochore KMN network complex.
Nat.Struct.Mol.Biol. 31 874 883 (2024)
PMID: 38459127 DOI: 10.1038/s41594-024-01249-y

Abstact

Faithful chromosome segregation requires robust, load-bearing attachments of chromosomes to the mitotic spindle, a function accomplished by large macromolecular complexes termed kinetochores. In most eukaryotes, the constitutive centromere-associated network (CCAN) complex of the inner kinetochore recruits to centromeres the ten-subunit outer kinetochore KMN network that comprises the KNL1C, MIS12C and NDC80C complexes. The KMN network directly attaches CCAN to microtubules through MIS12C and NDC80C. Here, we determined a high-resolution cryo-EM structure of the human KMN network. This showed an intricate and extensive assembly of KMN subunits, with the central MIS12C forming rigid interfaces with NDC80C and KNL1C, augmented by multiple peptidic inter-subunit connections. We also observed that unphosphorylated MIS12C exists in an auto-inhibited state that suppresses its capacity to interact with CCAN. Ser100 and Ser109 of the N-terminal segment of the MIS12C subunit Dsn1, two key targets of Aurora B kinase, directly stabilize this auto-inhibition. Our study indicates how selectively relieving this auto-inhibition through Ser100 and Ser109 phosphorylation might restrict outer kinetochore assembly to functional centromeres during cell division.

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