Abstract
Microtubules are central to eukaryotic cell morphogenesis. Microtubule plus-end tracking proteins (+TIPs) transport polarity factors to the cell cortex, thereby playing a key role in both microtubule dynamics and cell polarity. However, the signalling pathway linking +TIPs to cell polarity control remains elusive. Here we show that the fission yeast checkpoint kinase Cds1 (Chk2 homologue) delays the transition of growth polarity from monopolar to bipolar (termed NETO; new-end take-off). The +TIPs CLIP170 homologue Tip1 and kinesin Tea2 are responsible for this delay, which is accompanied by a reduction in microtubule dynamics at the cell tip. Remarkably, microtubule stabilization occurs asymmetrically, prominently at the non-growing cell end, which induces abnormal accumulation of the polarity factor Tea1. Importantly, NETO delay requires activation of calcineurin, which is carried out by Cds1, resulting in Tip1 dephosphorylation. Thus, our study establishes a critical link between calcineurin and checkpoint-dependent cell morphogenesis.
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Acknowledgements
We thank D. Brunner, K. Kitamura, H. Murakami and P. Russell for strains and plasmids; K. Gull for antibody; E. Kinoshita for Phos-tag; Astellas Pharma for providing FK506; and all members of our laboratory for their help. We also thank D. Brunner, S. Martin, D. McCollum, K. Sawin, M. Yanagida and J. Hirata for discussions; and H. Iefuji, K. Ono, T. Miyakawa and K. Hirata for their support. This work was supported by grants from the Ministry of Education, Science, and Culture of Japan (to K.K. and D.H.), and by Cancer Research UK (to T.T.)
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Experimental design and interpretation of data were conducted by all authors. K.K., T.K. and M.K. carried out experiments. K.K. and D.H. planned the project and D.H. wrote the paper with input from the co-authors. T.T. reviewed the manuscript.
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Kume, K., Koyano, T., Kanai, M. et al. Calcineurin ensures a link between the DNA replication checkpoint and microtubule-dependent polarized growth. Nat Cell Biol 13, 234–242 (2011). https://doi.org/10.1038/ncb2166
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DOI: https://doi.org/10.1038/ncb2166
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