Cdc14b regulates mammalian RNA polymerase II and represses cell cycle transcription.

Cdc14b regulates mammalian RNA polymerase II and represses cell cycle transcription.
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DOI:
10.1038/srep00189
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发表时间:
2011
期刊:
影响因子:
4.6
通讯作者:
Malumbres, Marcos
Malumbres, Marcos
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guillamot, Maria;Manchado, Eusebio;Chiesa, Massimo;Gomez-Lopez, Gonzalo;Pisano, David G.;Sacristan, Maria P.;Malumbres, Marcos

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Cdc14是酵母中必不可少的磷酸酶,但其在哺乳动物细胞周期中的作用尚不清楚。我们在这里报道,cdc14b敲除细胞显示出非预定的诱导多种细胞周期调节因子,导致从静止早期进入DNA复制和有丝分裂。Cdc14b使RNA聚合酶II的c端结构域(CTD)的Ser5去磷酸化,RNA聚合酶II是细胞周期蛋白依赖性激酶的主要底物。缺乏Cdc14b导致CTD-Ser5磷酸化增加,标记活性染色质的表观遗传修饰以及细胞周期调节因子的转录诱导。这些数据表明哺乳动物Cdc14磷酸酶在细胞周期中具有控制转录的功能。
Cdc14 is an essential phosphatase in yeast but its role in the mammalian cell cycle remains obscure. We report here that Cdc14b-knockout cells display unscheduled induction of multiple cell cycle regulators resulting in early entry into DNA replication and mitosis from quiescence. Cdc14b dephosphorylates Ser5 at the C-terminal domain (CTD) of RNA polymerase II, a major substrate of cyclin-dependent kinases. Lack of Cdc14b results in increased CTD-Ser5 phosphorylation, epigenetic modifications that mark active chromatin, and transcriptional induction of cell cycle regulators. These data suggest a function for mammalian Cdc14 phosphatases in the control of transcription during the cell cycle.
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