Low tension recruits the yeast Aurora B protein Ipl1 to centromeres in metaphase.

Low tension recruits the yeast Aurora B protein Ipl1 to centromeres in metaphase.
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DOI:
10.1242/jcs.261416
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发表时间:
2023-08-15
影响因子:
4
通讯作者:
--
中科院分区:
生物学2区
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有丝分裂中基因组的精确分离要求所有的染色体在纺锤体上都是双向的。细胞通过感受姐妹着丝粒之间的张力来监测双向取向。非双向取向的染色体具有低的着丝粒张力,这使得Aurora B(酵母Ipl 1)能够进行错误校正,局部松开着丝粒-微管附着,以允许微管分离和实现双向取向的新尝试。然而,目前尚不清楚低张力是否将极光B招募到着丝粒,或者低张力是否直接激活已经定位在着丝粒的极光B。在这项工作中,我们实验性地诱导中期酿酒酵母细胞的低张力,然后监测Ipl 1定位。我们发现低张力招募Ipl 1到着丝粒。此外,低张力诱导的Ipl 1募集依赖于Bub 1,这是已知的Ipl 1提供一个结合位点。相反,Top2,它也可以招募Ipl 1到着丝粒,是不需要的。我们的研究结果表明,细胞对着丝粒处的低张力敏感,并通过积极招募Ip 1 l进行纠错来做出反应。总结:酵母Aurora B(Ipl 1)在低张力下依赖于Bub 1被募集到中期着丝粒。
Accurate genome segregation in mitosis requires that all chromosomes are bioriented on the spindle. Cells monitor biorientation by sensing tension across sister centromeres. Chromosomes that are not bioriented have low centromere tension, which allows Aurora B (yeast Ipl1) to perform error correction that locally loosens kinetochore–microtubule attachments to allow detachment of microtubules and fresh attempts at achieving biorientation. However, it is not known whether low tension recruits Aurora B to centromeres or, alternatively, whether low tension directly activates Aurora B already localized at centromeres. In this work, we experimentally induced low tension in metaphase Saccharomyces cerevisiae yeast cells, then monitored Ipl1 localization. We find low tension recruits Ipl1 to centromeres. Furthermore, low tension-induced Ipl1 recruitment depended on Bub1, which is known to provide a binding site for Ipl1. In contrast, Top2, which can also recruit Ipl1 to centromeres, was not required. Our results demonstrate cells are sensitive to low tension at centromeres and respond by actively recruiting Ip1l for error correction. Summary: Yeast Aurora B (Ipl1) is recruited to metaphase centromeres under low tension, dependent on Bub1.
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