N-terminal regions of Mps1 kinase determine functional bifurcation.

N-terminal regions of Mps1 kinase determine functional bifurcation.
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DOI:
10.1083/jcb.200910027
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发表时间:
2010-04-05
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Schiebel E
Schiebel E
中科院分区:
其他
文献类型:
--
作者:
Araki Y;Gombos L;Migueleti SP;Sivashanmugam L;Antony C;Schiebel E

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纺锤体极体组分Spc 29和Cdc 31被鉴定为Mps 1激酶的靶点,Mps 1激酶在磷酸化时调节纺锤体极体中的蛋白质-蛋白质相互作用。Mps 1是一种保守的激酶,在芽殖酵母中在纺锤体极体(SPB)的复制、纺锤体检查点激活和动粒双向定位中起作用。Mps 1靶点的身份和表达特异性的亚结构域在很大程度上仍未被探索。使用一种新的系统性缺失分析和化学生物学的组合,我们确定了两个区域内的N末端的Mps 1是必不可少的SPB复制或动粒双向。MPS 1突变体的抑制分析缺陷的SPB复制和生化富集的Mps 1确定的基本SPB组件Spc 29和酵母中心蛋白Cdc 31作为Mps 1的目标SPB复制。我们的数据表明,Mps 1在G1/S磷酸化Spc 29招募Mps 2-Bbp 1复合物到新形成的SPB,以促进其插入核膜。Cdc 31在保守的T110残基处的Mps 1磷酸化控制底物与Kar 1蛋白的结合。这些发现解释了多SPB重复缺陷的mps 1突变体在分子水平上。
Spindle pole body components Spc29 and Cdc31 are identified as targets of Mps1 kinase, which, when phosphorylated, regulate protein–protein interactions in the spindle pole body. Mps1 is a conserved kinase that in budding yeast functions in duplication of the spindle pole body (SPB), spindle checkpoint activation, and kinetochore biorientation. The identity of Mps1 targets and the subdomains that convey specificity remain largely unexplored. Using a novel combination of systematic deletion analysis and chemical biology, we identified two regions within the N terminus of Mps1 that are essential for either SPB duplication or kinetochore biorientation. Suppression analysis of the MPS1 mutants defective in SPB duplication and biochemical enrichment of Mps1 identified the essential SPB components Spc29 and the yeast centrin Cdc31 as Mps1 targets in SPB duplication. Our data suggest that phosphorylation of Spc29 by Mps1 in G1/S recruits the Mps2–Bbp1 complex to the newly formed SPB to facilitate its insertion into the nuclear envelope. Mps1 phosphorylation of Cdc31 at the conserved T110 residue controls substrate binding to Kar1 protein. These findings explain the multiple SPB duplication defects of mps1 mutants on a molecular level.
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影响因子: --
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