Mps1 phosphorylation of condensin II controls chromosome condensation at the onset of mitosis.

Mps1 phosphorylation of condensin II controls chromosome condensation at the onset of mitosis.
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凝蛋白II的MPS1磷酸化控制有丝分裂发作时染色体凝结。

DOI:
10.1083/jcb.201308172
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发表时间:
2014-06-23
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Yoshida K
Yoshida K
中科院分区:
其他
文献类型:
--
作者:
Kagami Y;Nihira K;Wada S;Ono M;Honda M;Yoshida K

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Mps 1是必要的适当的凝聚素II加载到染色质和随后的染色体凝聚在有丝分裂。在有丝分裂过程中,基因组DNA被浓缩成染色体,以促进其平等地分离到子细胞中。染色体凝聚发生在细胞周期从G2期到有丝分裂的过程中。在前期染色体致密化的失败导致随后的染色体失调。然而,控制有丝分裂染色体凝聚早期阶段的分子机制在很大程度上是未知的。在这里,我们表明,Mps 1调节有丝分裂过程中的初始染色体凝聚。我们确定凝聚素II作为一种新的Mps 1相关蛋白。在有丝分裂过程中,Mps 1在Ser 492处磷酸化凝聚素II亚基之一CAP-H2,并且这种磷酸化事件是将凝聚素II适当加载到染色质上所必需的。Mps 1的缺失抑制了凝聚素II的染色体靶向作用和前期的精确染色体凝聚。这些发现表明,Mps 1在有丝分裂的早期阶段,以促进适当的染色体分离染色体组织。
Mps1 is necessary for proper condensin II loading onto chromatin and subsequent chromosome condensation during mitosis. During mitosis, genomic DNA is condensed into chromosomes to promote its equal segregation into daughter cells. Chromosome condensation occurs during cell cycle progression from G2 phase to mitosis. Failure of chromosome compaction at prophase leads to subsequent misregulation of chromosomes. However, the molecular mechanism that controls the early phase of mitotic chromosome condensation is largely unknown. Here, we show that Mps1 regulates initial chromosome condensation during mitosis. We identify condensin II as a novel Mps1-associated protein. Mps1 phosphorylates one of the condensin II subunits, CAP-H2, at Ser492 during mitosis, and this phosphorylation event is required for the proper loading of condensin II on chromatin. Depletion of Mps1 inhibits chromosomal targeting of condensin II and accurate chromosome condensation during prophase. These findings demonstrate that Mps1 governs chromosomal organization during the early stage of mitosis to facilitate proper chromosome segregation.
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