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Mps1 促进 Aurora B 的快速着丝粒积累。

Mps1 promotes rapid centromere accumulation of Aurora B.

机构信息

Department of Medical Oncology, University Medical Center Utrecht, Universiteitsweg 100, STR 2.129, 3584 CG Utrecht, The Netherlands.

出版信息

EMBO Rep. 2012 Sep;13(9):847-54. doi: 10.1038/embor.2012.93. Epub 2012 Jun 26.

Abstract

Aurora B localization to mitotic centromeres, which is required for proper chromosome alignment during mitosis, relies on Haspin-dependent histone H3 phosphorylation and on Bub1-dependent histone H2A phosphorylation--which interacts with Borealin through a Shugoshin (Sgo) intermediate. We demonstrate that Mps1 stimulates the latter recruitment axis. Mps1 activity enhances H2A-T120ph and is critical for Sgo1 recruitment to centromeres, thereby promoting Aurora B centromere recruitment in early mitosis. Importantly, chromosome biorientation defects caused by Mps1 inhibition are improved by restoring Aurora B centromere recruitment. As Mps1 kinetochore localization reciprocally depends on Aurora B, we propose that this Aurora B-Mps1 recruitment circuitry cooperates with the Aurora B-Haspin feedback loop to ensure rapid centromere accumulation of Aurora B at the onset of mitosis.

摘要

极光 B 向有丝分裂着丝粒的定位,这是有丝分裂过程中正确染色体排列所必需的,依赖于 Haspin 依赖性组蛋白 H3 磷酸化和 Bub1 依赖性组蛋白 H2A 磷酸化,这些磷酸化与通过 Shugoshin(Sgo)中间物与 Borealin 相互作用。我们证明 Mps1 刺激了后一个募集轴。Mps1 活性增强 H2A-T120ph,对 Sgo1 向着丝粒的募集至关重要,从而促进早期有丝分裂中极光 B 向着丝粒的募集。重要的是,通过恢复极光 B 着丝粒募集可以改善 Mps1 抑制引起的染色体双定向缺陷。由于 Mps1 动粒定位与极光 B 相互依赖,我们提出这种极光 B-Mps1 募集电路与极光 B-Haspin 反馈环合作,以确保在有丝分裂开始时快速积累极光 B 到着丝粒。

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Mps1 promotes rapid centromere accumulation of Aurora B.Mps1 促进 Aurora B 的快速着丝粒积累。
EMBO Rep. 2012 Sep;13(9):847-54. doi: 10.1038/embor.2012.93. Epub 2012 Jun 26.

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