Abstract
Polo-like kinase 1 (PLK1) critically regulates mitosis through its dynamic localization to kinetochores, centrosomes and the midzone. The polo-box domain (PBD) and activity of PLK1 mediate its recruitment to mitotic structures, but the mechanisms regulating PLK1 dynamics remain poorly understood. Here, we identify PLK1 as a target of the cullin 3 (CUL3)-based E3 ubiquitin ligase, containing the BTB adaptor KLHL22, which regulates chromosome alignment and PLK1 kinetochore localization but not PLK1 stability. In the absence of KLHL22, PLK1 accumulates on kinetochores, resulting in activation of the spindle assembly checkpoint (SAC). CUL3–KLHL22 ubiquitylates Lys 492, located within the PBD, leading to PLK1 dissociation from kinetochore phosphoreceptors. Expression of a non-ubiquitylatable PLK1-K492R mutant phenocopies inactivation of CUL3–KLHL22. KLHL22 associates with the mitotic spindle and its interaction with PLK1 increases on chromosome bi-orientation. Our data suggest that CUL3–KLHL22-mediated ubiquitylation signals degradation-independent removal of PLK1 from kinetochores and SAC satisfaction, which are required for faithful mitosis.
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Change history
12 March 2013
In the version of this Article that was originally published, the acknowledgement to S. Elowe was omitted in error.
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Acknowledgements
We thank W. Piwko, T. Courtheoux, P. Meraldi, D. Gerlich, A. Smith, O. Pourquié and M. Labouesse for helpful discussions and editing of the manuscript, E. A. Nigg, S. Elowe, J-M. Peters, P. Meraldi, U. Kutay and F. Barr for antibodies, D. Gerlich and U. Kutay for cell lines and G. Csucs, J. Kusch, O. Biehlmeier and T. Schwarz from the D-BIOL Light Microscopy Center for help with microscopy. J.B. was granted an EMBO Short Term Fellowship, and S.M. was funded by ETHZ and the Boehringer Ingelheim Fonds. I.S. was supported by the ETHZ and the Swiss National Science Foundation (SNF), and research in D.R. and M.P.’s laboratories by the Canadian Institute of Health Research (CIHR), the European Research Council (ERC), the SNF and the ETHZ, respectively. Research in I.S.’s laboratory is supported by the IGBMC, the ATIP-AVENIR program, CNRS, INSERM and Sanofi-Aventis.
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J.B., S.M. and T.M. conceived ideas, performed experiments, and analysed and interpreted the data. H.S. and K.H. performed bioinformatic analysis of protein microarray data. A.P. and D.R. collaborated on protein microarray experiments. P.P. conducted the MS analysis of PLK1 ubiquitylation sites. M. Posch and J.R.S. collaborated on live-cell video microscopy techniques. M. Peter and I.S. conceived ideas. J.B., M. Peter and I.S. wrote the manuscript.
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GFP–KLHL22 spindle and centrosome localization 1.
Live video microscopy of cells expressing GFP–KLHL22, showing localization of GFP–KLHL22 during mitosis. Movies were generated from maximum intensity projections through Z-stacks spanning a total depth of 15 μm at 1 μm increments. Projected images were normalized to 0.5% saturated pixels per frame to balance visual effects of photobleaching. Time resolution is 30 s per frame. (AVI 303 kb)
GFP–KLHL22 spindle and centrosome localization 2
Live video microscopy of cells expressing GFP–KLHL22, showing localization of GFP–KLHL22 during mitosis. Movies were generated from maximum intensity projections through Z-stacks spanning a total depth of 15 μm at 1 μm increments. Projected images were normalized to 0.5% saturated pixels per frame to balance visual effects of photobleaching. Time resolution is 30 s per frame. (AVI 667 kb)
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Beck, J., Maerki, S., Posch, M. et al. Ubiquitylation-dependent localization of PLK1 in mitosis. Nat Cell Biol 15, 430–439 (2013). https://doi.org/10.1038/ncb2695
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DOI: https://doi.org/10.1038/ncb2695
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