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XB-ART-1952
Mol Cell April 29, 2005; 18 (3): 379-91.

Mechanism of Aurora B activation by INCENP and inhibition by hesperadin.

Sessa F , Mapelli M , Ciferri C , Tarricone C , Areces LB , Schneider TR , Stukenberg PT , Musacchio A .


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 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.

PubMed ID: 15866179
Article link: Mol Cell
Grant support: [+]
Genes referenced: aurka aurkb incenp tpx2



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