2BFX

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.226 
  • R-Value Work: 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

  • 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: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AURORA KINASE B-A
A, B
284Xenopus laevisGene Names: aurkb-a (airk2-a)
EC: 2.7.11.1
Find proteins for Q6DE08 (Xenopus laevis)
Go to UniProtKB:  Q6DE08
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
INNER CENTROMERE PROTEIN A
C, D
43Xenopus laevisGene Names: incenp-a
Find proteins for O13024 (Xenopus laevis)
Go to UniProtKB:  O13024
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
TPO
Query on TPO
A, B
L-PEPTIDE LINKINGC4 H10 N O6 PTHR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.197 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 45.940α = 90.00
b = 66.900β = 96.79
c = 116.520γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
CNSrefinement
SCALAdata scaling
MOSFLMdata reduction
SCALEPACKdata scaling
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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