Inheritance of cortical ER in yeast is required for normal septin organization.

Inheritance of cortical ER in yeast is required for normal septin organization.
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正常的Septin组织需要酵母中皮质ER的遗传。

DOI:
10.1083/jcb.200708205
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发表时间:
2007-11-05
影响因子:
7.8
通讯作者:
Levine, Timothy P.
Levine, Timothy P.
中科院分区:
生物学1区
文献类型:
--
作者:
Loewen, Christopher J. R.;Young, Barry P.;Tavassoli, Shabnam;Levine, Timothy P.

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细胞如何监测细胞器的分布在很大程度上是未知的。在发芽酵母中,内质网(ER)的最大亚域是附着在质膜上的皮质ER(CER)网络。CER从母细胞到芽的传递被称为CER遗传,在萌芽早期是一个有序的过程。我们发现,在缺乏Scs2的细胞中,CER的遗传是有缺陷的。Scs2是酵母中完整的ER膜蛋白VAP(囊泡相关膜蛋白相关蛋白)的同源物,在所有真核生物中都是保守的。Scs2和人类VAP都以酵母芽尖为靶标,表明VAP在将ER附着到极化生长的位置上具有保守的作用。此外,Scs2或Ice2(另一种参与CER遗传的蛋白质)的缺失会扰乱花蕾颈部的Septin组装。这种扰动导致了通过G2的转换延迟,激活了酵母Wee1激酶(Swe1)和形态发生检查点。因此,我们确定了一种参与感知内质网分布的机制。
How cells monitor the distribution of organelles is largely unknown. In budding yeast, the largest subdomain of the endoplasmic reticulum (ER) is a network of cortical ER (cER) that adheres to the plasma membrane. Delivery of cER from mother cells to buds, which is termed cER inheritance, occurs as an orderly process early in budding. We find that cER inheritance is defective in cells lacking Scs2, a yeast homologue of the integral ER membrane protein VAP (vesicle-associated membrane protein–associated protein) conserved in all eukaryotes. Scs2 and human VAP both target yeast bud tips, suggesting a conserved action of VAP in attaching ER to sites of polarized growth. In addition, the loss of either Scs2 or Ice2 (another protein involved in cER inheritance) perturbs septin assembly at the bud neck. This perturbation leads to a delay in the transition through G2, activating the Saccharomyces wee1 kinase (Swe1) and the morphogenesis checkpoint. Thus, we identify a mechanism involved in sensing the distribution of ER.
DOI: 10.1083/jcb.200304030
发表时间: 2003-12-22
期刊: The Journal of cell biology
影响因子: --
作者:
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期刊: CURRENT BIOLOGY
影响因子: 9.2
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