Timely Degradation of Wip1 Phosphatase by APC/C Activator Protein Cdh1 is Necessary for Normal Mitotic Progression.

Abstract:

:Wip1 belongs to the protein phosphatase C (PP2C) family, of which expression is up-regulated by a number of external stresses, and serves as a stress modulator in normal physiological conditions. When overexpressed, premature dephosphorylation of stress-mediators by Wip1 results in abrogation of tumor surveillance, thus Wip1 acts as an oncogene. Previously, the functional regulation of Wip1 in cell-cycle progression by counteracting cellular G1 and G2/M checkpoint activity in response to DNA damage was reported. However, other than in stress conditions, the function and regulatory mechanism of Wip1 has not been fully determined. Herein, we demonstrated that protein regulation of Wip1 occurs in a cell cycle-dependent manner, which is directly governed by APC/C(Cdh1) at the end of mitosis. In particular, we also showed evidence that Wip1 phosphatase activity is closely associated with its own protein stability, suggesting that reduced phosphatase activity of Wip1 during mitosis could trigger its degradation. Furthermore, to verify the physiological role of its phosphatase activity during mitosis, we established doxycycline-inducible cell models, including a Wip1 wild type (WT) and phosphatase dead mutant (Wip1 DA). When ectopically expressing Wip1 WT, we observed a delay in the transition from metaphase to anaphase. In conclusion, these studies show that mitotic degradation of Wip1 by APC/C(Cdh1) is important for normal mitotic progression.

journal_name

J Cell Biochem

authors

Jeong HC,Gil NY,Lee HS,Cho SJ,Kim K,Chun KH,Cho H,Cha HJ

doi

10.1002/jcb.25114

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

1602-12

issue

8

eissn

0730-2312

issn

1097-4644

journal_volume

116

pub_type

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