Abstract
Separation of duplicated centrosomes (spindle-pole bodies or SPBs in yeast) is a crucial step in the biogenesis of the mitotic spindle. In vertebrates, centrosome separation requires the BimC family kinesin Eg5 and the activities of Cdk1 and polo kinase; however, the roles of these kinases are not fully understood. In Saccharomyces cerevisiae, SPB separation also requires activated Cdk1 and the plus-end kinesins Cin8 (homologous to vertebrate Eg5) and Kip1. Here we report that polo kinase has a role in the separation of SPBs. We show that adequate accumulation of Cin8 and Kip1 requires inactivation of the anaphase-promoting complex-activator Cdh1 through sequential phosphorylation by Cdk1 and polo kinase. In this process, Cdk1 functions as a priming kinase in that Cdk1-mediated phosphorylation creates a binding site for polo kinase,which further phosphorylates Cdh1. Thus, Cdh1 inactivation through the synergistic action of Cdk1 and polo kinase provides a new model for inactivation of cell-cycle effectors.
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Acknowledgements
We are grateful to Janet Meehl and Michele Jones for their invaluable help with some of the experiments. We wish to thank David Morgan, Wolfgang Zachariae, Simonetta Piatti, Matthias Peter, Christopher Hardy and Kyung Lee for plasmids and strains, Mark Hall for valuable advice and Chee Peng Ng for help with electron microscopy. The work in MW laboratory was supported by NIH grant GM51312. U.S. is an adjunct faculty member of the Department of Pharmacology, National University of Singapore. The U.S. lab is supported by the Biomedical Research Council of A*STAR (Agency for Science, Technology and Research), Singapore.
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K.C. and L.H.H. performed all experiments; T.H.G. and M.W. carried out the electron microscopy analysis; U.S. and K.C. planned the project and analysed the data.
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Supplementary Figures S1, S2, S3, S4, S5 and Supplementary Table S1 (PDF 604 kb)
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Crasta, K., Lim, H., Giddings, T. et al. Inactivation of Cdh1 by synergistic action of Cdk1 and polo kinase is necessary for proper assembly of the mitotic spindle. Nat Cell Biol 10, 665–675 (2008). https://doi.org/10.1038/ncb1729
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DOI: https://doi.org/10.1038/ncb1729
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