Abstract：
:Supernumerary centrosomes promote the assembly of abnormal spindles in many human cancers. The observation that modest changes in the centrosomal levels of Mps1 kinase can cause centrosome overduplication in human cells suggests the existence of a regulatory system that may tightly control its centrosomal stability. Here, we show that Cdkn3, a Cdk-associated phosphatase, prevents Mps1-mediated centrosome overduplication. We identify Cdkn3 as a direct binding partner of Mps1. The interaction between Mps1 and Cdkn3 is required for Mps1 to recruit Cdkn3 to centrosomes. Subsequently, Mps1-bound Cdkn3 forms a regulatory system that controls the centrosomal levels of Mps1 through proteasome-mediated degradation and thereby prevents Mps1-mediated centrosome overduplication. Conversely, knockdown of Cdkn3 stabilizes Mps1 at centrosomes, which promotes centrosome overduplication. We suggest that Mps1 and Cdkn3 form a self-regulated feedback loop at centrosomes to tightly control the centrosomal levels of Mps1, which prevents centrosome overduplication in human cells.
journal_name
Cell Repjournal_title
Cell reportsauthors
Srinivas V,Kitagawa M,Wong J,Liao PJ,Lee SHdoi
10.1016/j.celrep.2015.10.039subject
Has Abstractpub_date
2015-11-24 00:00:00pages
1569-77issue
8issn
2211-1247pii
S2211-1247(15)01209-7journal_volume
13pub_type
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