Abstract
PLK1 regulates almost every aspect of mitotic events, including mitotic entry, spindle assembly, chromosome alignment, sister chromatid segregation, metaphase-anaphase transition, cytokinesis, etc. In regulating the chromosome alignment and sister chromatid segregation, PLK1 has to be localized to and removed from kinetochores at the right times, and the underlying mechanism that regulates PLK1 both spatially and temporally only became clearer recently. It has been found that deubiquitination and ubiquitination of PLK1 are responsible for its localization to and dissociation from the kinetochores, respectively. The equilibrium of this ubiquitination and deubiquitination plays an important role in regulating proper chromosome alignment and timely sister chromatid segregation. Here, we summarize and discuss the recent findings in investigating the spatial and temporal regulation of PLK1 during chromosome alignment and sister chromatid segregation.

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- PLK1:
-
Polo-like kinase 1
- Usp16:
-
Ubiquitin-specific peptidase 16
- CUL3:
-
Cullin 3
- SAC:
-
Spindle assembly checkpoint
- KT–MT:
-
Kinetochore–microtubule
- PB:
-
Polo box
- PBD:
-
Polo box domain
- PBIP1:
-
Polo box domain-interacting protein 1
- INCENP:
-
Inner centromere protein
- APC/C:
-
Anaphase-promoting complex/cyclosome
- CCAN:
-
Constitutive centromere-associated network
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Acknowledgements
We thank other members of our laboratories for helpful comments and critical discussion on this work. Work in Liu laboratory is supported by a NIH Grant (5SC2GM089622-03), and in Zhang laboratory by the National Natural Science Foundation of China (NSFC) (31520103906, 31371365, and 31430051) and the Ministry of Science and Technology of China (2016YFA0100501 and 2016YFA0500201).
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Liu, J., Zhang, C. The equilibrium of ubiquitination and deubiquitination at PLK1 regulates sister chromatid separation. Cell. Mol. Life Sci. 74, 2127–2134 (2017). https://doi.org/10.1007/s00018-017-2457-5
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DOI: https://doi.org/10.1007/s00018-017-2457-5


