کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2178887 1549721 2010 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Plk1-mediated mitotic phosphorylation of PinX1 regulates its stability
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Plk1-mediated mitotic phosphorylation of PinX1 regulates its stability
چکیده انگلیسی

PinX1 was originally identified as a Pin2/TRF1-interacting protein that suppresses telomerase activity via its telomerase inhibitor domain (TID) and regulates the nucleolar localization of TRF1 in telomerase-positive cells. In addition to its telomeric localization, PinX1 can be found in the nucleoli of human cells. Our recent studies have shown that PinX1 localizes to the chromosome periphery and kinetochores in mitosis. Depletion of PinX1 results in lagging chromosomes in mitosis and micronuclei in interphase. However, less is known about the post-translational modification of PinX1 in mitosis. Here, we show that Polo-like kinase 1 (Plk1) is a novel interacting protein of PinX1. Plk1 interacts with and phosphorylates PinX1 in vivo and in vitro. Overexpression of Plk1 promotes protein turnover of PinX1, a process that depends on ubiquitin-associated proteasomal degradation. Depletion of Plk1 using siRNA increases the stability of PinX1 at protein level in mitosis. Moreover, Plk1-mediated phosphorylation of PinX1 at five phosphorylation sites is essential for its Plk1-induced degradation. These findings suggest that Plk1 may negatively regulate the stability of PinX1 by mitotic phosphorylation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Cell Biology - Volume 89, Issue 10, October 2010, Pages 748–756
نویسندگان
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