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 

wwPDB Validation 3D Report Full Report


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: 10.1016/j.molcel.2008.09.017
  • Structures With Same Primary Citation

  • 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 sensiti ...

    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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitotic checkpoint serine/threonine-protein kinase BUB1
A
365Homo sapiensMutation(s): 0 
Gene Names: BUB1BUB1L
EC: 2.7.11.1
Find proteins for O43683 (Homo sapiens)
Go to UniProtKB:  O43683
NIH Common Fund Data Resources
PHAROS  O43683
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ADP
Query on ADP

Download CCD File 
A
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
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

View Full Validation Report



Entry History 

Deposition Data

  • Deposited Date: 2014-09-02 
  • Released Date: 2014-11-12 
  • Deposition Author(s): Tomchick, D.R., Yu, H.
  • This entry supersedes: 3E7E

Revision History 

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