CSN5 specifically interacts with CDK2 and controls senescence in a cytoplasmic cyclin E-mediated manner.

CSN5 specifically interacts with CDK2 and controls senescence in a cytoplasmic cyclin E-mediated manner.
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DOI:
10.1038/srep01054
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发表时间:
2013
期刊:
影响因子:
4.6
通讯作者:
Kato, Jun-ya
Kato, Jun-ya
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Yoshida, Akihiro;Yoneda-Kato, Noriko;Kato, Jun-ya

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哺乳动物COP9信号体复合物的第五组分(CSN 5)在细胞增殖和衰老中起着重要作用,但其分子介导剂仍有待确定。在这里,我们寻找各种细胞周期调节因子之间的相互作用,并发现CSN 5,但不是CSN全复合物,结合CDK2在体内和体外。CSN5的缺失增强了Akt对CDK2的磷酸化,导致CDK2与细胞周期蛋白E以抗链霉素B的方式在细胞质中积聚,并损害了视网膜母细胞瘤蛋白的磷酸化。额外的敲除CDK2,降低细胞周期蛋白E的表达到正常水平,没有恢复细胞增殖,但显着抑制CSN 5耗尽细胞的衰老。细胞质细胞周期蛋白E的强制表达诱导永生化细胞系的过早衰老。这些结果表明,CSN5通过CDK2以一种新的方式控制早衰,这取决于细胞质中的细胞周期蛋白E。
The fifth component (CSN5) of the mammalian COP9 signalosome complex plays an essential role in cell proliferation and senescence, but its molecular mediator remains to be determined. Here, we searched for interactors among various cell cycle regulators, and found that CSN5, but not the CSN holo-complex, bound to CDK2 in vivo and in vitro. Depletion of CSN5 enhanced phosphorylation of CDK2 by Akt, resulting in cytoplasmic accumulation of CDK2 together with cyclin E in a leptomycin B-resistant manner, and impaired phosphorylation of the retinoblastoma protein. Additional knockdown of CDK2, which reduced the expression of cyclin E to the normal level, did not restore cell proliferation, but significantly suppressed senescence in CSN5-depleted cells. Enforced expression of cytoplasmic cyclin E induced premature senescence in immortalized cell lines. These results show that CSN5 functions through CDK2 to control premature senescence in a novel way, depending on cyclin E in the cytoplasm.
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