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Science 320 (5883): 1655-1658

Copyright © 2008 by the American Association for the Advancement of Science

Bora and the Kinase Aurora A Cooperatively Activate the Kinase Plk1 and Control Mitotic Entry

Akiko Seki,1 Judith A. Coppinger,2 Chang-Young Jang,1 John R. Yates, III,2 Guowei Fang1*

Abstract: A central question in the study of cell proliferation is, what controls cell-cycle transitions? Although the accumulation of mitotic cyclins drives the transition from the G2 phase to the M phase in embryonic cells, the trigger for mitotic entry in somatic cells remains unknown. We report that the synergistic action of Bora and the kinase Aurora A (Aur-A) controls the G2-M transition. Bora accumulates in the G2 phase and promotes Aur-A–mediated activation of Polo-like kinase 1 (Plk1), leading to the activation of cyclin-dependent kinase 1 and mitotic entry. Mechanistically, Bora interacts with Plk1 and controls the accessibility of its activation loop for phosphorylation and activation by Aur-A. Thus, Bora and Aur-A control mitotic entry, which provides a mechanism for one of the most important yet ill-defined events in the cell cycle.

1 Department of Biological Sciences, Stanford University, Stanford, CA 94305–5020, USA.
2 Department of Chemical Physiology, The Scripps Research Institute, La Jolla, CA 92037, USA.

* To whom correspondence should be addressed. E-mail: gwfang{at}

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J. Biol. Chem. 284, 33177-33184
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Cancer Res. 69, 7207-7215
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FAM29A, a target of Plk1 regulation, controls the partitioning of NEDD1 between the mitotic spindle and the centrosomes.
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   Abstract »    Full Text »    PDF »
Kinase Signaling in the Spindle Checkpoint.
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J. Biol. Chem. 284, 15359-15363
   Abstract »    Full Text »    PDF »
Discovery and Exploitation of Inhibitor-resistant Aurora and Polo Kinase Mutants for the Analysis of Mitotic Networks.
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J. Biol. Chem. 284, 15880-15893
   Abstract »    Full Text »    PDF »
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   Abstract »    Full Text »    PDF »
Plk1 and Aurora A regulate the depolymerase activity and the cellular localization of Kif2a.
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J. Cell Sci. 122, 1334-1341
   Abstract »    Full Text »    PDF »
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A. Lindqvist, V. Rodriguez-Bravo, and R. H. Medema (2009)
J. Cell Biol. 185, 193-202
   Abstract »    Full Text »    PDF »
Aurora-A Kinase Is Essential for Bipolar Spindle Formation and Early Development.
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Mol. Cell. Biol. 29, 1059-1071
   Abstract »    Full Text »    PDF »
FAM29A promotes microtubule amplification via recruitment of the NEDD1-{gamma}-tubulin complex to the mitotic spindle.
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J. Cell Biol. 183, 835-848
   Abstract »    Full Text »    PDF »
Sequestration of Polo kinase to microtubules by phosphopriming-independent binding to Map205 is relieved by phosphorylation at a CDK site in mitosis.
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Genes & Dev. 22, 2707-2720
   Abstract »    Full Text »    PDF »

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