3SI5

Kinetochore-BUBR1 kinase complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.193 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of a Blinkin-BUBR1 Complex Reveals an Interaction Crucial for Kinetochore-Mitotic Checkpoint Regulation via an Unanticipated Binding Site.

Bolanos-Garcia, V.M.Lischetti, T.Matak-Vinkovic, D.Cota, E.Simpson, P.J.Chirgadze, D.Y.Spring, D.R.Robinson, C.V.Nilsson, J.Blundell, T.L.

(2011) Structure 19: 1691-1700

  • DOI: 10.1016/j.str.2011.09.017

  • PubMed Abstract: 
  • The maintenance of genomic stability relies on the spindle assembly checkpoint (SAC), which ensures accurate chromosome segregation by delaying the onset of anaphase until all chromosomes are properly bioriented and attached to the mitotic spindle. B ...

    The maintenance of genomic stability relies on the spindle assembly checkpoint (SAC), which ensures accurate chromosome segregation by delaying the onset of anaphase until all chromosomes are properly bioriented and attached to the mitotic spindle. BUB1 and BUBR1 kinases are central for this process and by interacting with Blinkin, link the SAC with the kinetochore, the macromolecular assembly that connects microtubules with centromeric DNA. Here, we identify the Blinkin motif critical for interaction with BUBR1, define the stoichiometry and affinity of the interaction, and present a 2.2 Å resolution crystal structure of the complex. The structure defines an unanticipated BUBR1 region responsible for the interaction and reveals a novel Blinkin motif that undergoes a disorder-to-order transition upon ligand binding. We also show that substitution of several BUBR1 residues engaged in binding Blinkin leads to defects in the SAC, thus providing the first molecular details of the recognition mechanism underlying kinetochore-SAC signaling.


    Organizational Affiliation

    Department of Biochemistry, University of Cambridge, Cambridge CB2 1GA, UK. victor@cryst.bioc.cam.ac.uk




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitotic checkpoint serine/threonine-protein kinase BUB1 beta
A, B
176Homo sapiensMutation(s): 0 
Gene Names: BUB1B (BUBR1, MAD3L, SSK1)
EC: 2.7.11.1
Find proteins for O60566 (Homo sapiens)
Go to Gene View: BUB1B
Go to UniProtKB:  O60566
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein CASC5
X, Y
24Homo sapiensMutation(s): 0 
Gene Names: KNL1 (CASC5, KIAA1570)
Find proteins for Q8NG31 (Homo sapiens)
Go to Gene View: KNL1
Go to UniProtKB:  Q8NG31
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.193 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 124.398α = 90.00
b = 40.143β = 91.38
c = 75.391γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
PROTEUM2data collection
SADABSdata scaling
SAINTdata reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-10-26
    Type: Initial release
  • Version 1.1: 2011-11-30
    Type: Database references