Multiple assembly mechanisms anchor the KMN spindle checkpoint platform at human mitotic kinetochores.

Multiple assembly mechanisms anchor the KMN spindle checkpoint platform at human mitotic kinetochores.
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DOI:
10.1083/jcb.201407074
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发表时间:
2015-01-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Yu H
Yu H
中科院分区:
其他
文献类型:
--
作者:
Kim S;Yu H

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在人类细胞的有丝分裂过程中,涉及极光B和CENP-T的单独机制促进微管和检查点受体复合物KMN在着丝粒处的锚定。在有丝分裂过程中,纺锤体检查点感知没有正确附着在纺锤体微管上的动粒,并防止早熟的姐妹染色单体分离和非整倍体。内部着丝粒的组成性着丝粒相关网络(CCAN)锚定KMN网络,由Knl 1,Mis 12复合物(Mis 12 C)和Ndc 80复合物(Ndc 80 C)在外部着丝粒。KMN是微管和检查点蛋白的关键动粒受体。在这里,我们表明,几乎完全灭活KMN在人类细胞中通过多种策略产生强烈的检查点缺陷,即使所有的动粒缺乏微管附着。这些KMN失活策略揭示了多种KMN组装机制在人类有丝分裂动粒。在一种机制中,着丝粒激酶Aurora B使Mis 12 C磷酸化并增强其与CCAN亚基CENP-C的结合。另一方面,CENP-T以CENP-H-I-K依赖性方式促进KMN附着。我们的研究提供了深入了解有丝分裂特异性组装的检查点平台KMN在人类着丝粒的机制。
During mitosis in human cells, separate mechanisms involving Aurora B and CENP-T promote anchoring of the microtubule- and checkpoint-receptor complex KMN at kinetochores. During mitosis, the spindle checkpoint senses kinetochores not properly attached to spindle microtubules and prevents precocious sister-chromatid separation and aneuploidy. The constitutive centromere-associated network (CCAN) at inner kinetochores anchors the KMN network consisting of Knl1, the Mis12 complex (Mis12C), and the Ndc80 complex (Ndc80C) at outer kinetochores. KMN is a critical kinetochore receptor for both microtubules and checkpoint proteins. Here, we show that nearly complete inactivation of KMN in human cells through multiple strategies produced strong checkpoint defects even when all kinetochores lacked microtubule attachment. These KMN-inactivating strategies reveal multiple KMN assembly mechanisms at human mitotic kinetochores. In one mechanism, the centromeric kinase Aurora B phosphorylates Mis12C and strengthens its binding to the CCAN subunit CENP-C. In another, CENP-T contributes to KMN attachment in a CENP-H-I-K–dependent manner. Our study provides insights into the mechanisms of mitosis-specific assembly of the checkpoint platform KMN at human kinetochores.
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