A morphogenesis checkpoint monitors the actin cytoskeleton in yeast.

A morphogenesis checkpoint monitors the actin cytoskeleton in yeast.
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DOI:
10.1083/jcb.142.6.1487
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发表时间:
1998-09-21
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Lew DJ
Lew DJ
中科院分区:
其他
文献类型:
--
作者:
McMillan JN;Sia RA;Lew DJ

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芽殖酵母中的形态发生检查点响应于阻止芽形成的细胞极性扰动而延迟细胞周期进程(Lew,D. J.,和S.I.里德1995. 129:739- 749)。细胞周期延迟取决于酪氨酸激酶Swe 1 p,其磷酸化并抑制细胞周期蛋白依赖性激酶Cdc 28 p(Sia,R. A.L.,H.A.《先驱报》和D. J.卢1996.摩尔生物细胞7:1657- 1666)。在本报告中,我们调查了触发此检查点的缺陷的性质。一个Swe 1 p依赖性细胞周期延迟触发的肌动蛋白细胞骨架的直接扰动,即使极性建立功能保持完整。此外,肌动蛋白扰动甚至可以在已经形成芽的细胞中触发检查点,这表明检查点直接监测肌动蛋白组织,而不是(或除了)极性建立或芽形成。此外,我们表明,检查点可以检测肌动蛋白扰动通过大部分的细胞周期。然而,通过延迟细胞周期进程来响应这种扰动的能力被限制在细胞周期的狭窄窗口内,由检查点效应物Swe 1 p的周期性积累所限定。
A morphogenesis checkpoint in budding yeast delays cell cycle progression in response to perturbations of cell polarity that prevent bud formation (Lew, D.J., and S.I. Reed. 1995. J. Cell Biol. 129:739– 749). The cell cycle delay depends upon the tyrosine kinase Swe1p, which phosphorylates and inhibits the cyclin-dependent kinase Cdc28p (Sia, R.A.L., H.A. Herald, and D.J. Lew. 1996. Mol. Biol. Cell. 7:1657– 1666). In this report, we have investigated the nature of the defect(s) that trigger this checkpoint. A Swe1p- dependent cell cycle delay was triggered by direct perturbations of the actin cytoskeleton, even when polarity establishment functions remained intact. Furthermore, actin perturbation could trigger the checkpoint even in cells that had already formed a bud, suggesting that the checkpoint directly monitors actin organization, rather than (or in addition to) polarity establishment or bud formation. In addition, we show that the checkpoint could detect actin perturbations through most of the cell cycle. However, the ability to respond to such perturbations by delaying cell cycle progression was restricted to a narrow window of the cell cycle, delimited by the periodic accumulation of the checkpoint effector, Swe1p.
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