Ltc1 is an ER-localized sterol transporter and a component of ER-mitochondria and ER-vacuole contacts.

Ltc1 is an ER-localized sterol transporter and a component of ER-mitochondria and ER-vacuole contacts.
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DOI:
10.1083/jcb.201502033
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发表时间:
2015-05-25
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Nunnari J
Nunnari J
中科院分区:
其他
文献类型:
--
作者:
Murley A;Sarsam RD;Toulmay A;Yamada J;Prinz WA;Nunnari J

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细胞学和生物化学分析表明,Ylr 072 w,这里更名为接触位点1处的脂质转移(Ltc 1),是一种定位于ER-线粒体和ER-液泡接触位点的固醇转运蛋白,分别与细胞器特异性组分Tom 70/81和Vac 8合作。细胞器接触位点在细胞中执行基本功能,包括脂质和离子稳态、膜动力学和信号传导。在酵母中使用正向蛋白质组学方法,我们确定了新的ER-线粒体和ER-液泡接触指定的一个未知的蛋白质,Ylr 072 w。Ylr 072 w是一种保守的蛋白质,具有选择性转运固醇的α和VASt结构域,因此被称为Ltc 1,用于接触位点1的脂质转移。Ltc 1分别通过线粒体输入受体Tom 70/71和空泡蛋白Vac 8定位于ER-线粒体和ER-空泡接触。在线粒体中,Ltc 1是细胞活力所需的Mdm 34,ER-线粒体遇到结构的亚基的情况下。在液泡中,LTC 1是必需的甾醇丰富的膜结构域的形成,以应对压力。增加液泡中Ltc 1的比例足以诱导富含甾醇的液泡结构域,而无需应力。因此,我们的数据支持一个模型,其中LTC 1是一个甾醇依赖性调节器的细胞器和细胞内稳态通过其双重定位ER-线粒体和ER-液泡接触网站。
Cytological and biochemical analyses show that Ylr072w, here renamed Lipid transfer at contact site 1 (Ltc1), is a sterol transport protein localized to both ER–mitochondria and ER–vacuole contact sites in partnership with the organelle-specific components Tom70/81 and Vac8, respectively. Organelle contact sites perform fundamental functions in cells, including lipid and ion homeostasis, membrane dynamics, and signaling. Using a forward proteomics approach in yeast, we identified new ER–mitochondria and ER–vacuole contacts specified by an uncharacterized protein, Ylr072w. Ylr072w is a conserved protein with GRAM and VASt domains that selectively transports sterols and is thus termed Ltc1, for Lipid transfer at contact site 1. Ltc1 localized to ER–mitochondria and ER–vacuole contacts via the mitochondrial import receptors Tom70/71 and the vacuolar protein Vac8, respectively. At mitochondria, Ltc1 was required for cell viability in the absence of Mdm34, a subunit of the ER–mitochondria encounter structure. At vacuoles, Ltc1 was required for sterol-enriched membrane domain formation in response to stress. Increasing the proportion of Ltc1 at vacuoles was sufficient to induce sterol-enriched vacuolar domains without stress. Thus, our data support a model in which Ltc1 is a sterol-dependent regulator of organelle and cellular homeostasis via its dual localization to ER–mitochondria and ER–vacuole contact sites.
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