2BFX

Mechanism of Aurora-B activation by INCENP and inhibition by Hesperadin.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Mechanism of Aurora B Activation by Incenp and Inhibition by Hesperadin

Sessa, F.Mapelli, M.Ciferri, C.Tarricone, C.Areces, L.B.Schneider, T.R.Stukenberg, P.T.Musacchio, A.

(2005) Mol Cell 18: 379

  • DOI: 10.1016/j.molcel.2005.03.031
  • Primary Citation of Related Structures:  
    2BFY, 2BFX

  • PubMed Abstract: 
  • Aurora family serine/threonine kinases control mitotic progression, and their deregulation is implicated in tumorigenesis. Aurora A and Aurora B, the best-characterized members of mammalian Aurora kinases, are approximately 60% identical but bind to ...

    Aurora family serine/threonine kinases control mitotic progression, and their deregulation is implicated in tumorigenesis. Aurora A and Aurora B, the best-characterized members of mammalian Aurora kinases, are approximately 60% identical but bind to unrelated activating subunits. The structure of the complex of Aurora A with the TPX2 activator has been reported previously. Here, we report the crystal structure of Aurora B in complex with the IN-box segment of the inner centromere protein (INCENP) activator and with the small molecule inhibitor Hesperadin. The Aurora B:INCENP complex is remarkably different from the Aurora A:TPX2 complex. INCENP forms a crown around the small lobe of Aurora B and induces the active conformation of the T loop allosterically. The structure represents an intermediate state of activation of Aurora B in which the Aurora B C-terminal segment stabilizes an open conformation of the catalytic cleft, and a critical ion pair in the kinase active site is impaired. Phosphorylation of two serines in the carboxyl terminus of INCENP generates the fully active kinase.


    Organizational Affiliation

    Department of Experimental Oncology, European Institute of Oncology, Via Ripamonti 435, 20141 Milan, Italy.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AURORA KINASE B-AAB284Xenopus laevisMutation(s): 0 
Gene Names: aurkb-aairk2-a
EC: 2.7.11.1
Find proteins for Q6DE08 (Xenopus laevis)
Explore Q6DE08 
Go to UniProtKB:  Q6DE08
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
INNER CENTROMERE PROTEIN ACD43Xenopus laevisMutation(s): 0 
Gene Names: incenp-a
Find proteins for O13024 (Xenopus laevis)
Explore O13024 
Go to UniProtKB:  O13024
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
A,BL-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.94α = 90
b = 66.9β = 96.79
c = 116.52γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
MOSFLMdata reduction
SCALEPACKdata scaling
SCALAdata scaling
AMoREphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-05-03
    Type: Initial release
  • Version 1.1: 2014-05-14
    Changes: Database references, Derived calculations, Non-polymer description, Other, Refinement description, Source and taxonomy, Structure summary, Version format compliance
  • Version 1.2: 2015-05-20
    Changes: Structure summary