Plasma membrane microdomains regulate turnover of transport proteins in yeast.

Plasma membrane microdomains regulate turnover of transport proteins in yeast.
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DOI:
10.1083/jcb.200806035
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发表时间:
2008-12-15
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Tanner W
Tanner W
中科院分区:
其他
文献类型:
--
作者:
Grossmann G;Malinsky J;Stahlschmidt W;Loibl M;Weig-Meckl I;Frommer WB;Opekarová M;Tanner W

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在这项研究中,我们调查是否稳定分离的蛋白质和脂质在酵母质膜服务于一个特定的生物功能。我们发现,21个蛋白质簇内或与富含麦角甾醇的膜室Can 1(MCC)。然而,内吞机制的蛋白质被排除在MCC之外。在一个屏幕上,我们确定了28个基因影响MCC的外观,并发现参与脂质生物合成和囊泡运输的基因显着过度。缺失Pil 1(eisosomes的一种组分)或Nce 102(MCC的一种整合膜蛋白),会导致所有MCC标记物的消失。这些缺失突变体还显示出MCC-居民渗透酶Can 1和Fur 4的加速内吞作用。我们的数据表明,从MCC的释放使这些蛋白质的内吞机制。向野生型细胞中添加精氨酸导致Can 1的类似再分布和营业额增加。因此,MCC代表质膜内控制转运蛋白周转的保护区。
In this study, we investigate whether the stable segregation of proteins and lipids within the yeast plasma membrane serves a particular biological function. We show that 21 proteins cluster within or associate with the ergosterol-rich membrane compartment of Can1 (MCC). However, proteins of the endocytic machinery are excluded from MCC. In a screen, we identified 28 genes affecting MCC appearance and found that genes involved in lipid biosynthesis and vesicle transport are significantly overrepresented. Deletion of Pil1, a component of eisosomes, or of Nce102, an integral membrane protein of MCC, results in the dissipation of all MCC markers. These deletion mutants also show accelerated endocytosis of MCC-resident permeases Can1 and Fur4. Our data suggest that release from MCC makes these proteins accessible to the endocytic machinery. Addition of arginine to wild-type cells leads to a similar redistribution and increased turnover of Can1. Thus, MCC represents a protective area within the plasma membrane to control turnover of transport proteins.
酿酒酵母中蛋白质出口的新途径。
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