Abstract：
:Centrosomes in mammalian cells have recently been implicated in cytokinesis; however, their role in this process is poorly defined. Here, we describe a human coiled-coil protein, Cep55 (centrosome protein 55 kDa), that localizes to the mother centriole during interphase. Despite its association with gamma-TuRC anchoring proteins CG-NAP and Kendrin, Cep55 is not required for microtubule nucleation. Upon mitotic entry, centrosome dissociation of Cep55 is triggered by Erk2/Cdk1-dependent phosphorylation at S425 and S428. Furthermore, Cep55 locates to the midbody and plays a role in cytokinesis, as its depletion by siRNA results in failure of this process. S425/428 phosphorylation is required for interaction with Plk1, enabling phosphorylation of Cep55 at S436. Cells expressing phosphorylation-deficient mutant forms of Cep55 undergo cytokinesis failure. These results highlight the centrosome as a site to organize phosphorylation of Cep55, enabling it to relocate to the midbody to function in mitotic exit and cytokinesis.
journal_name
Dev Celljournal_title
Developmental cellauthors
Fabbro M,Zhou BB,Takahashi M,Sarcevic B,Lal P,Graham ME,Gabrielli BG,Robinson PJ,Nigg EA,Ono Y,Khanna KKdoi
10.1016/j.devcel.2005.09.003keywords:
subject
Has Abstractpub_date
2005-10-01 00:00:00pages
477-88issue
4eissn
1534-5807issn
1878-1551pii
S1534-5807(05)00337-0journal_volume
9pub_type
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