Charcot-Marie-Tooth disease-linked protein SIMPLE functions with the ESCRT machinery in endosomal trafficking.

Charcot-Marie-Tooth disease-linked protein SIMPLE functions with the ESCRT machinery in endosomal trafficking.
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腓骨肌萎缩症相关蛋白 SIMPLE 与内体运输中的 ESCRT 机制一起发挥作用。

DOI:
10.1083/jcb.201204137
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发表时间:
2012-11-26
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Li L
Li L
中科院分区:
其他
文献类型:
--
作者:
Lee SM;Chin LS;Li L

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SIMPLE 与 ESCRT 机制一起发挥作用,促进内体到溶酶体的运输,但该功能会受到腓骨肌萎缩症相关突变的损害。溶酶体/晚期内体小整合膜蛋白 (SIMPLE) 的突变会导致常染色体显性遗传的夏科-马里-图斯病 (CMT) 1C 型。 SIMPLE 的细胞功能尚不清楚,SIMPLE 突变的致病机制仍不清楚。在这里,我们报告 SIMPLE 与早期内体上运输所需的内体分选复合物 (ESCRT) 组件 STAM1、Hrs 和 TSG101 相互作用和共定位,并与 ESCRT 机制一起控制内体到溶酶体的运输。我们的分析表明,SIMPLE 是有效地将 ESCRT 成分招募到内体膜以及调节内体运输和 ErbB 受体信号衰减所必需的。我们发现,CMT 相关的 SIMPLE 突变通过功能丧失、显性失活机制损害了 SIMPLE 调节 ErbB 运输和信号传导的能力,导致 ERK1/2 信号传导延长激活。我们的研究结果表明 SIMPLE 作为内体运输调节剂的功能,并提供了将内体运输失调与 CMT 发病机制联系起来的证据。
SIMPLE functions with the ESCRT machinery to promote endosome-to-lysosome trafficking, and this function is impaired by Charcot-Marie-Tooth disease–associated mutations. Mutations in small integral membrane protein of lysosome/late endosome (SIMPLE) cause autosomal dominant, Charcot-Marie-Tooth disease (CMT) type 1C. The cellular function of SIMPLE is unknown and the pathogenic mechanism of SIMPLE mutations remains elusive. Here, we report that SIMPLE interacted and colocalized with endosomal sorting complex required for transport (ESCRT) components STAM1, Hrs, and TSG101 on early endosomes and functioned with the ESCRT machinery in the control of endosome-to-lysosome trafficking. Our analyses revealed that SIMPLE was required for efficient recruitment of ESCRT components to endosomal membranes and for regulating endosomal trafficking and signaling attenuation of ErbB receptors. We found that the ability of SIMPLE to regulate ErbB trafficking and signaling was impaired by CMT-linked SIMPLE mutations via a loss-of-function, dominant-negative mechanism, resulting in prolonged activation of ERK1/2 signaling. Our findings indicate a function of SIMPLE as a regulator of endosomal trafficking and provide evidence linking dysregulated endosomal trafficking to CMT pathogenesis.
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