Dynamic phosphorylation of CENP-N by CDK1 guides accurate chromosome segregation in mitosis.

Dynamic phosphorylation of CENP-N by CDK1 guides accurate chromosome segregation in mitosis.
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CDK1 对 CENP-N 的动态磷酸化指导有丝分裂中准确的染色体分离

DOI:
10.1093/jmcb/mjad041
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发表时间:
2023-11-27
影响因子:
5.5
通讯作者:
--
中科院分区:
生物学1区
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--
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在有丝分裂中,精确的染色体分离依赖于动粒,这是一种将动态纺锤体微管与着丝粒染色质偶联的超分子机制。然而,在有丝分裂过程中的组成型着丝粒相关网络(CCAN)的结构-活性关系仍然没有得到表征。基于我们最近对人类CCAN结构的冷冻电子显微镜分析,我们研究了人类CENP-N的动态磷酸化如何调节准确的染色体分离。我们的质谱分析揭示了CENP-N通过CDK 1的有丝分裂磷酸化,其调节CENP-L-CENP-N相互作用以实现准确的染色体分离和CCAN组织。CENP-N磷酸化的扰动被证明可以阻止正确的染色体对齐并激活纺锤体组装检查点。这些分析提供了一个以前未定义的着丝粒-动粒网络和准确的染色体分离之间的联系机制的见解。
In mitosis, accurate chromosome segregation depends on the kinetochore, a supermolecular machinery that couples dynamic spindle microtubules to centromeric chromatin. However, the structure–activity relationship of the constitutive centromere-associated network (CCAN) during mitosis remains uncharacterized. Building on our recent cryo-electron microscopic analyses of human CCAN structure, we investigated how dynamic phosphorylation of human CENP-N regulates accurate chromosome segregation. Our mass spectrometric analyses revealed mitotic phosphorylation of CENP-N by CDK1, which modulates the CENP-L–CENP-N interaction for accurate chromosome segregation and CCAN organization. Perturbation of CENP-N phosphorylation is shown to prevent proper chromosome alignment and activate the spindle assembly checkpoint. These analyses provide mechanistic insight into a previously undefined link between the centromere–kinetochore network and accurate chromosome segregation.
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