Borealin: a novel chromosomal passenger required for stability of the bipolar mitotic spindle.

Borealin: a novel chromosomal passenger required for stability of the bipolar mitotic spindle.
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DOI:
10.1083/jcb.200404001
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发表时间:
2004-07-19
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Earnshaw WC
Earnshaw WC
中科院分区:
其他
文献类型:
--
作者:
Gassmann R;Carvalho A;Henzing AJ;Ruchaud S;Hudson DF;Honda R;Nigg EA;Gerloff DL;Earnshaw WC

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Aurora B 激酶、INCENP 和 Survivin 的染色体过客复合物在有丝分裂中的着丝粒和中央纺锤体中具有重要的调节作用。在这里,我们描述了 Borealin,该复合体的新成员。有丝分裂细胞中大约一半的 Aurora B 与 INCENP、Borealin 和 Survivin 复合; Borealin 在体外结合 Survivin 和 INCENP。第二种复合物含有 Aurora B 和 INCENP,但不含 Borealin 或 Survivin。 RNA干扰导致的Borealin消耗会延迟有丝分裂进程,并导致着丝粒-纺锤体错位以及与异位紫苑相关的双极纺锤体增加。额外的极显然是在染色体实现双极取向后形成的,严重破坏了后期染色体的分配。 Borealin 耗尽对组蛋白 H3 丝氨酸 10 磷酸化影响很小。这些结果表明染色体过客全复合体参与维持纺锤体完整性,并表明组蛋白 H3 丝氨酸 10 磷酸化是由 Aurora B–INCENP 亚复合体进行的。
The chromosomal passenger complex of Aurora B kinase, INCENP, and Survivin has essential regulatory roles at centromeres and the central spindle in mitosis. Here, we describe Borealin, a novel member of the complex. Approximately half of Aurora B in mitotic cells is complexed with INCENP, Borealin, and Survivin; and Borealin binds Survivin and INCENP in vitro. A second complex contains Aurora B and INCENP, but no Borealin or Survivin. Depletion of Borealin by RNA interference delays mitotic progression and results in kinetochore–spindle misattachments and an increase in bipolar spindles associated with ectopic asters. The extra poles, which apparently form after chromosomes achieve a bipolar orientation, severely disrupt the partitioning of chromosomes in anaphase. Borealin depletion has little effect on histone H3 serine10 phosphorylation. These results implicate the chromosomal passenger holocomplex in the maintenance of spindle integrity and suggest that histone H3 serine10 phosphorylation is performed by an Aurora B–INCENP subcomplex.
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