The novel mouse Polo-like kinase 5 responds to DNA damage and localizes in the nucleolus.

The novel mouse Polo-like kinase 5 responds to DNA damage and localizes in the nucleolus.
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DOI:
10.1093/nar/gkq011
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发表时间:
2010-05
影响因子:
14.9
通讯作者:
Bahassi el M
Bahassi el M
中科院分区:
生物学2区
文献类型:
--
作者:
Andrysik Z;Bernstein WZ;Deng L;Myer DL;Li YQ;Tischfield JA;Stambrook PJ;Bahassi el M

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polo样激酶(Plk1-4)是一类重要的蛋白质,参与细胞周期调控和DNA损伤反应的许多方面。在这里,我们报道了克隆polo样激酶家族的第五个成员,命名为Plk5。DNA和蛋白质序列分析表明,Plk5与Plk2和Plk3的相似性大于与Plk1和Plk4的相似性。与这一观察结果一致,我们发现小鼠Plk5是一种DNA损伤诱导基因。小鼠Plk5蛋白主要定位于核仁,其n端片段中假定的核仁定位信号(NoLS)的缺失会破坏其核仁定位。Plk5的异位表达导致G1期细胞周期阻滞、DNA合成减少和细胞凋亡,这是Plk3的一个共同特征。有趣的是,与小鼠Plk5基因相比,人类Plk5基因序列包含一个终止密码子,该密码子产生一个缺失部分激酶结构域的截断蛋白。
Polo-like kinases (Plk1-4) are emerging as an important class of proteins involved in many aspects of cell cycle regulation and response to DNA damage. Here, we report the cloning of a fifth member of the polo-like kinase family named Plk5. DNA and protein sequence analyses show that Plk5 shares more similarities with Plk2 and Plk3 than with Plk1 and Plk4. Consistent with this observation, we show that mouse Plk5 is a DNA damage inducible gene. Mouse Plk5 protein localizes predominantly to the nucleolus, and deletion of a putative nucleolus localization signal (NoLS) within its N-terminal moiety disrupts its nucleolar localization. Ectopic expression of Plk5 leads to cell cycle arrest in G1, decreased DNA synthesis, and to apoptosis, a characteristic it shares with Plk3. Interestingly, in contrast to mouse Plk5 gene, the sequence of human Plk5 contains a stop codon that produces a truncated protein lacking part of the kinase domain.
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发表时间: 2000-08-10
期刊: ONCOGENE
影响因子: 8
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