4R8Q

Structure and substrate recruitment of the human spindle checkpoint kinase bub1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structure and substrate recruitment of the human spindle checkpoint kinase Bub1.

Kang, J.Yang, M.Li, B.Qi, W.Zhang, C.Shokat, K.M.Tomchick, D.R.Machius, M.Yu, H.

(2008) Mol Cell 32: 394-405

  • DOI: https://doi.org/10.1016/j.molcel.2008.09.017
  • Primary Citation of Related Structures:  
    4R8Q

  • PubMed Abstract: 

    In mitosis, the spindle checkpoint detects a single unattached kinetochore, inhibits the anaphase-promoting complex or cyclosome (APC/C), and prevents premature sister chromatid separation. The checkpoint kinase Bub1 contributes to checkpoint sensitivity through phosphorylating the APC/C activator, Cdc20, and inhibiting APC/C catalytically. We report here the crystal structure of the kinase domain of Bub1, revealing the requirement of an N-terminal extension for its kinase activity. Though the activation segment of Bub1 is ordered and has structural features indicative of active kinases, the C-terminal portion of this segment sterically restricts substrate access to the active site. Bub1 uses docking motifs, so-called KEN boxes, outside its kinase domain to recruit Cdc20, one of two known KEN box receptors. The KEN boxes of Bub1 are required for the spindle checkpoint in human cells. Therefore, its unusual active-site conformation and mode of substrate recruitment suggest that Bub1 has an exquisitely tuned specificity for Cdc20.


  • Organizational Affiliation

    Howard Hughes Medical Institute, The University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Mitotic checkpoint serine/threonine-protein kinase BUB1365Homo sapiensMutation(s): 0 
Gene Names: BUB1BUB1L
EC: 2.7.11.1
UniProt & NIH Common Fund Data Resources
Find proteins for O43683 (Homo sapiens)
Explore O43683 
Go to UniProtKB:  O43683
PHAROS:  O43683
GTEx:  ENSG00000169679 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO43683
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.31 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.222 
  • R-Value Observed: 0.226 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 108.768α = 90
b = 147.632β = 90
c = 47.196γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
HKL-2000data reduction
HKL-2000data scaling
SHELXSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-11-12
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Refinement description