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Mammalian Polo-like Kinase 1 (Plk1) Promotes Proper Chromosome Segregation by Phosphorylating and Delocalizing the PBIP1.CENP-Q Complex from Kinetochores

Title
Mammalian Polo-like Kinase 1 (Plk1) Promotes Proper Chromosome Segregation by Phosphorylating and Delocalizing the PBIP1.CENP-Q Complex from Kinetochores
Authors
Park, Chi HoonPark, Jung-EunKim, Tae-SungKang, Young HwiSoung, Nak-KyunZhou, MingKim, Nam-HyungBang, Jeong KyuLee, Kyung S.
Ewha Authors
강영휘
Issue Date
2015
Journal Title
JOURNAL OF BIOLOGICAL CHEMISTRY
ISSN
0021-9258JCR Link1083-351XJCR Link
Citation
vol. 290, no. 13, pp. 8569 - 8581
Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Mammalian Plk1 is critically required for proper M phase progression. Plk1 is self-recruited to prekinetochores/kinetochores by phosphorylating and binding to the Thr-78 motif of a kinetochore scaffold protein, PBIP1 (also called CENP-U/50), which forms a stable complex with another kinetochore component, CENP-Q. However, the mechanism regulating Plk1 localization to this site remains largely unknown. Here, we demonstrate that the PBIP1 . CENP-Q complex became hyperphosphorylated and rapidly delocalized from kinetochores as cells entered mitosis. Plk1 phosphorylated the CENP-Q subunit of the PBIP1.CENP-Q complex at multiple sites, and mutation of nine Plk1-dependent phosphorylation sites to Ala (9A) enhanced CENP-Q association with chromatin and prolonged CENP-Q localization to kinetochores. Conversely, mutation of the nine sites to phospho-mimicking Asp/Glu (9D/E) residues dissociated CENP-Q from chromatin and kept the CENP-Q(9D/E) mutant from localizing to interphase prekinetochores. Strikingly, both the 9A and 9D/E mutants induced a defect in proper chromosome segregation, suggesting that both timely localization of the PBIP1.CENP-Q complex to prekinetochores and delocalization from kinetochores are critical for normal M phase progression. Notably, although Plk1 did not alter the level of PBIP1 and CENP-Q ubiquitination, Plk1-dependent phosphorylation and delocalization of these proteins from kinetochores appeared to indirectly lead to their degradation in the cytosol. Thus, we propose that Plk1 regulates the timing of the delocalization and ultimate destruction of the PBIP1.CENP-Q complex and that these processes are important not only for promoting Plk1-dependent mitotic progression, but also for resetting the timing of Plk1 recruitment to prekinetochores in the next cell cycle.
DOI
10.1074/jbc.M114.623546
Appears in Collections:
연구기관 > 세포항상성연구센터 > Journal papers
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