Sli15(INCENP) dephosphorylation prevents mitotic checkpoint reengagement due to loss of tension at anaphase onset.

Sli15(INCENP) dephosphorylation prevents mitotic checkpoint reengagement due to loss of tension at anaphase onset.
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DOI:
10.1016/j.cub.2010.06.023
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发表时间:
2010-08-10
期刊:
影响因子:
9.2
通讯作者:
Uhlmann, Frank
Uhlmann, Frank
中科院分区:
生物学1区
文献类型:
--
作者:
Mirchenko, Lesia;Uhlmann, Frank

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有丝分裂检查点,也称为纺锤体组装检查点,延迟后期开始,直到所有染色体都达到有丝分裂纺锤体上的双极张力。一旦达到这一点,蛋白酶分离酶被激活以切割染色体粘附素复合物,从而触发分裂后期。内聚蛋白裂解释放了姐妹染色单体之间的张力,但是为什么有丝分裂检查点现在保持沉默却知之甚少。在这里,使用芽殖酵母作为一个模型,我们表明,在后期发病的姐妹染色单体凝聚力的损失将从事有丝分裂检查点,如果这是不阻止伴随分离依赖激活的Cdc14磷酸酶。Cdc14反过来通过使Sli15 INCENP去磷酸化来使有丝分裂检查点失活,Sli15 INCENP是保守的极光B激酶复合物的亚基,其形成了所提出的染色体张力传感器的一部分。Sli15INCENP在后期从着丝粒到中央纺锤体的去磷酸化依赖性重新定位见于从酵母到人类的生物体中。我们的研究结果表明,Sli15INCENP去磷酸化是一个进化上保守的机制,防止有丝分裂检查点重新接合时,姐妹染色单体之间的张力是在后期开始丢失。在分裂后期开始时失去凝聚力可以重新激活有丝分裂检查点,这可以通过Cdc14磷酸酶的激活来防止,同时Cdc14通过去磷酸化Sli15INCENP使有丝分裂检查点失活,一种保守机制使有丝分裂检查点失活。
The mitotic checkpoint, also known as the spindle assembly checkpoint, delays anaphase onset until all chromosomes have reached bipolar tension on the mitotic spindle. Once this is achieved, the protease separase is activated to cleave the chromosomal cohesin complex, thereby triggering anaphase. Cohesin cleavage releases tension between sister chromatids, but why the mitotic checkpoint now remains silent is poorly understood. Here, using budding yeast as a model, we show that loss of sister chromatid cohesion at anaphase onset would engage the mitotic checkpoint if this was not prevented by concomitant separase-dependent activation of the Cdc14 phosphatase. Cdc14, in turn, inactivates the mitotic checkpoint by dephosphorylating Sli15INCENP, a subunit of the conserved Aurora B kinase complex that forms part of the proposed chromosomal tension sensor. Dephosphorylation-dependent relocation of Sli15INCENP from centromeres to the central spindle during anaphase is seen in organisms from yeast to human. Our results suggest that Sli15INCENP dephosphorylation is part of an evolutionarily conserved mechanism that prevents the mitotic checkpoint from reengaging when tension between sister chromatids is lost at anaphase onset. ► Loss of cohesion at anaphase onset can reengage the mitotic checkpoint ► This is prevented by activation of the Cdc14 phosphatase at the same time ► Cdc14 inactivates the mitotic checkpoint by dephosphorylating Sli15INCENP ► A conserved mechanism inactivates the mitotic checkpoint in anaphase
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