5MU3 image
Deposition Date 2017-01-12
Release Date 2017-11-01
Last Version Date 2024-01-17
Entry Detail
PDB ID:
5MU3
Keywords:
Title:
Crystal structure of Ctf19-Mcm21 kinetochore assembly bound with Ctf19-Mcm21 binding motif of central kinetochore subunit Okp1
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.10 Å
R-Value Free:
0.24
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Central kinetochore subunit MCM21
Gene (Uniprot):MCM21
Chain IDs:A, D
Chain Length:189
Number of Molecules:2
Biological Source:Kluyveromyces lactis NRRL Y-1140
Polymer Type:polypeptide(L)
Molecule:Central kinetochore subunit CTF19
Gene (Uniprot):CTF19
Chain IDs:B
Chain Length:165
Number of Molecules:1
Biological Source:Kluyveromyces lactis NRRL Y-1140
Polymer Type:polypeptide(L)
Molecule:Central kinetochore subunit Okp1
Gene (Uniprot):OKP1
Chain IDs:C, F
Chain Length:67
Number of Molecules:2
Biological Source:Kluyveromyces lactis NRRL Y-1140
Polymer Type:polypeptide(L)
Molecule:Central kinetochore subunit CTF19
Gene (Uniprot):CTF19
Chain IDs:E
Chain Length:165
Number of Molecules:1
Biological Source:Kluyveromyces lactis NRRL Y-1140
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CSX E CYS modified residue
Primary Citation
Molecular basis for inner kinetochore configuration through RWD domain-peptide interactions.
EMBO J. 36 3458 3482 (2017)
PMID: 29046335 DOI: 10.15252/embj.201796636

Abstact

Kinetochores are dynamic cellular structures that connect chromosomes to microtubules. They form from multi-protein assemblies that are evolutionarily conserved between yeasts and humans. One of these assemblies-COMA-consists of subunits Ame1CENP-U, Ctf19CENP-P, Mcm21CENP-O and Okp1CENP-Q A description of COMA molecular organization has so far been missing. We defined the subunit topology of COMA, bound with inner kinetochore proteins Nkp1 and Nkp2, from the yeast Kluyveromyces lactis, with nanoflow electrospray ionization mass spectrometry, and mapped intermolecular contacts with hydrogen-deuterium exchange coupled to mass spectrometry. Our data suggest that the essential Okp1 subunit is a multi-segmented nexus with distinct binding sites for Ame1, Nkp1-Nkp2 and Ctf19-Mcm21. Our crystal structure of the Ctf19-Mcm21 RWD domains bound with Okp1 shows the molecular contacts of this important inner kinetochore joint. The Ctf19-Mcm21 binding motif in Okp1 configures a branch of mitotic inner kinetochores, by tethering Ctf19-Mcm21 and Chl4CENP-N-Iml3CENP-L Absence of this motif results in dependence on the mitotic checkpoint for viability.

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Primary Citation of related structures