Induced ectopic kinetochore assembly bypasses the requirement for CENP-A nucleosomes.

Induced ectopic kinetochore assembly bypasses the requirement for CENP-A nucleosomes.
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DOI:
10.1016/j.cell.2011.03.031
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发表时间:
2011-04-29
期刊:
影响因子:
64.5
通讯作者:
Cheeseman IM
Cheeseman IM
中科院分区:
生物学1区
文献类型:
--
作者:
Gascoigne KE;Takeuchi K;Suzuki A;Hori T;Fukagawa T;Cheeseman IM

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准确的染色体分离需要在着丝粒处组装多蛋白质动粒复合物。尽管先前的工作确定了着丝粒组蛋白H3变体CENP-A作为着丝粒特化所必需的重要上游因子,但在人类细胞中CENP-A不足以用于动粒组装。在这里,我们证明了两个组成的DNA结合动粒成分,CENP-C和CENP-T,功能直接动粒形成。用交替的染色体靶向结构域替换CENP-C和CENP-T的DNA结合区域将这些蛋白质募集到异位位点,导致CENP-A独立的动粒组装。这些异位动粒样病灶是基于多个动粒组分的化学计量组装而起作用的,所述多个动粒组分包括微管结合KMN网络、微管附着的存在、纺锤体检查点蛋白Mad 2的微管敏感性募集以及含病灶染色体的分离行为。我们还发现CENP-T磷酸化调节内源性和异位着丝粒的有丝分裂组装。因此,CENP-C和CENP-T形成脊椎动物动粒组装的关键调节平台。
Accurate chromosome segregation requires assembly of the multi-protein kinetochore complex at centromeres. Although prior work identified the centromeric histone H3-variant CENP-A as the important upstream factor necessary for centromere specification, in human cells CENP-A is not sufficient for kinetochore assembly. Here, we demonstrate that two constitutive DNA-binding kinetochore components, CENP-C and CENP-T, function to direct kinetochore formation. Replacing the DNA-binding regions of CENP-C and CENP-T with alternate chromosome-targeting domains recruits these proteins to ectopic loci, resulting in CENP-A-independent kinetochore assembly. These ectopic kinetochore-like foci are functional based on the stoichiometric assembly of multiple kinetochore components including the microtubule-binding KMN network, the presence of microtubule attachments, the microtubule-sensitive recruitment of the spindle checkpoint protein Mad2, and the segregation behavior of foci-containing chromosomes. We additionally find that CENP-T phosphorylation regulates the mitotic assembly of both endogenous and ectopic kinetochores. Thus, CENP-C and CENP-T form a critical regulated platform for vertebrate kinetochore assembly.
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