Cholesterol sensor ORP1L contacts the ER protein VAP to control Rab7-RILP-p150 Glued and late endosome positioning.

Cholesterol sensor ORP1L contacts the ER protein VAP to control Rab7-RILP-p150 Glued and late endosome positioning.
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DOI:
10.1083/jcb.200811005
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发表时间:
2009-06-29
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Neefjes J
Neefjes J
中科院分区:
其他
文献类型:
--
作者:
Rocha N;Kuijl C;van der Kant R;Janssen L;Houben D;Janssen H;Zwart W;Neefjes J

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晚期内体(LE)具有由其与各种马达蛋白的相互作用决定的特征性细胞内分布。与动力肌动蛋白亚基p150 Glued相关的马达蛋白通过Rab 7效应物Rab 7相互作用溶酶体蛋白(RILP)与氧固醇结合蛋白ORP 1 L结合至LE。我们发现LE中的胆固醇水平由ORP 1 L感知,并且在外周囊泡中较低。在低胆固醇条件下,ORP 1 L构象诱导内质网(ER)-LE膜接触位点的形成。在这些位点,ER蛋白VAP(VAMP [囊泡相关膜蛋白]相关ER蛋白)可以与Rab 7-RILP复合物反式相互作用,以去除p150 Glued和相关马达。然后LE移动到微管正端。在高胆固醇条件下,如C型尼曼-皮克病,这一过程被阻止,由于动力蛋白运动活性,LE在微管负端积累。这些数据解释了ER和胆固醇如何控制LE与马达蛋白的关联及其在细胞中的定位。
Late endosomes (LEs) have characteristic intracellular distributions determined by their interactions with various motor proteins. Motor proteins associated to the dynactin subunit p150Glued bind to LEs via the Rab7 effector Rab7-interacting lysosomal protein (RILP) in association with the oxysterol-binding protein ORP1L. We found that cholesterol levels in LEs are sensed by ORP1L and are lower in peripheral vesicles. Under low cholesterol conditions, ORP1L conformation induces the formation of endoplasmic reticulum (ER)–LE membrane contact sites. At these sites, the ER protein VAP (VAMP [vesicle-associated membrane protein]-associated ER protein) can interact in trans with the Rab7–RILP complex to remove p150Glued and associated motors. LEs then move to the microtubule plus end. Under high cholesterol conditions, as in Niemann-Pick type C disease, this process is prevented, and LEs accumulate at the microtubule minus end as the result of dynein motor activity. These data explain how the ER and cholesterol control the association of LEs with motor proteins and their positioning in cells.
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