PKM2 regulates chromosome segregation and mitosis progression of tumor cells.

PKM2 regulates chromosome segregation and mitosis progression of tumor cells.
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DOI:
10.1016/j.molcel.2013.11.001
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发表时间:
2014-01-09
期刊:
影响因子:
16
通讯作者:
Lu, Zhimin
Lu, Zhimin
中科院分区:
生物学1区
文献类型:
--
作者:
Jiang, Yuhui;Li, Xinjian;Yang, Weiwei;Hawke, David H.;Zheng, Yanhua;Xia, Yan;Aldape, Kenneth;Wei, Chongyang;Guo, Fang;Chen, Yan;Lu, Zhimin

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肿瘤特异性丙酮酸激酶M2 (PKM2)在有氧糖酵解和基因转录中都起作用。PKM2通过控制cyclin D1的表达调控G1-S相变。然而,PKM2是否直接控制细胞周期进程尚不清楚。我们在这里发现PKM2,而不是PKM1,在有丝分裂期间结合纺锤体检查点蛋白Bub3,并在Y207位点磷酸化Bub3。这种磷酸化是Bub3-Bub1复合体募集到着丝点所必需的,在那里它与Blinkin相互作用,并且对于正确的着丝点-微管附着,有丝分裂/纺锤体组装检查点,准确的染色体分离,细胞存活和增殖以及活跃的EGF受体诱导的脑肿瘤发生至关重要。此外,人胶质母细胞瘤标本中bub3y207磷酸化水平与组蛋白H3-S10磷酸化水平相关,与胶质母细胞瘤预后相关。这些发现强调了PKM2作为一种蛋白激酶控制染色体分离的保真度、细胞周期进展和肿瘤发生的作用。
Tumor-specific pyruvate kinase M2 (PKM2) is instrumental in both aerobic glycolysis and gene transcription. PKM2 regulates G1-S phase transition by controlling cyclin D1 expression. However, it is not known whether PKM2 directly controls cell cycle progression. We show here that PKM2, but not PKM1, binds to the spindle checkpoint protein Bub3 during mitosis and phosphorylates Bub3 at Y207. This phosphorylation is required for Bub3-Bub1 complex recruitment to kinetochores, where it interacts with Blinkin and is essential for correct kinetochore-microtubule attachment, mitotic/spindle-assembly checkpoint, accurate chromosome segregation, cell survival and proliferation, and active EGF receptor-induced brain tumorigenesis. In addition, the level of Bub3 Y207 phosphorylation correlated with histone H3-S10 phosphorylation in human glioblastoma specimens and with glioblastoma prognosis. These findings highlight the role of PKM2 as a protein kinase controlling the fidelity of chromosome segregation, cell cycle progression, and tumorigenesis.
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