4AEZ

Crystal Structure of Mitotic Checkpoint Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.221 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of the Mitotic Checkpoint Complex

Chao, W.C.H.Kulkarni, K.A.Zhang, Z.Kong, E.H.Barford, D.

(2012) Nature 484: 208

  • DOI: 10.1038/nature10896

  • PubMed Abstract: 
  • In mitosis, the spindle assembly checkpoint (SAC) ensures genome stability by delaying chromosome segregation until all sister chromatids have achieved bipolar attachment to the mitotic spindle. The SAC is imposed by the mitotic checkpoint complex (M ...

    In mitosis, the spindle assembly checkpoint (SAC) ensures genome stability by delaying chromosome segregation until all sister chromatids have achieved bipolar attachment to the mitotic spindle. The SAC is imposed by the mitotic checkpoint complex (MCC), whose assembly is catalysed by unattached chromosomes and which binds and inhibits the anaphase-promoting complex/cyclosome (APC/C), the E3 ubiquitin ligase that initiates chromosome segregation. Here, using the crystal structure of Schizosaccharomyces pombe MCC (a complex of mitotic spindle assembly checkpoint proteins Mad2, Mad3 and APC/C co-activator protein Cdc20), we reveal the molecular basis of MCC-mediated APC/C inhibition and the regulation of MCC assembly. The MCC inhibits the APC/C by obstructing degron recognition sites on Cdc20 (the substrate recruitment subunit of the APC/C) and displacing Cdc20 to disrupt formation of a bipartite D-box receptor with the APC/C subunit Apc10. Mad2, in the closed conformation (C-Mad2), stabilizes the complex by optimally positioning the Mad3 KEN-box degron to bind Cdc20. Mad3 and p31(comet) (also known as MAD2L1-binding protein) compete for the same C-Mad2 interface, which explains how p31(comet) disrupts MCC assembly to antagonize the SAC. This study shows how APC/C inhibition is coupled to degron recognition by co-activators.


    Organizational Affiliation

    Division of Structural Biology, Institute of Cancer Research, Chester Beatty Laboratories, 237 Fulham Road, London, SW3 6JB, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
WD REPEAT-CONTAINING PROTEIN SLP1
A, D, G
401Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: slp1
Find proteins for P78972 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  P78972
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
MITOTIC SPINDLE CHECKPOINT COMPONENT MAD2
B, E, H
203Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 2 
Gene Names: mad2
Find proteins for O14417 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O14417
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
MITOTIC SPINDLE CHECKPOINT COMPONENT MAD3
C, F, I
223Schizosaccharomyces pombe (strain 972 / ATCC 24843)Mutation(s): 0 
Gene Names: mad3
Find proteins for O59767 (Schizosaccharomyces pombe (strain 972 / ATCC 24843))
Go to UniProtKB:  O59767
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.221 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 70.810α = 90.00
b = 286.900β = 119.04
c = 72.010γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
SCALAdata scaling
AMoREphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-03-21
    Type: Initial release
  • Version 1.1: 2012-04-25
    Type: Other