ALIX binds a YPX(3)L motif of the GPCR PAR1 and mediates ubiquitin-independent ESCRT-III/MVB sorting.

ALIX binds a YPX(3)L motif of the GPCR PAR1 and mediates ubiquitin-independent ESCRT-III/MVB sorting.
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DOI:
10.1083/jcb.201110031
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发表时间:
2012-04-30
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Trejo J
Trejo J
中科院分区:
其他
文献类型:
--
作者:
Dores MR;Chen B;Lin H;Soh UJ;Paing MM;Montagne WA;Meerloo T;Trejo J

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一种新的MVB/溶酶体信号受体分选途径绕过了泛素化和泛素结合ESCRT的要求,可能广泛适用于含有YPXnL基序的GPCR。在哺乳动物细胞中,信号受体对溶酶体的分选是一个重要的调节过程。在降解过程中,受体被泛素修饰,并通过转运所需的内体分选复合体(ESCRT)-0、-I、-II和-III复合体进入多囊泡体(MVB)的腔内小泡(ILV)。然而,目前还不清楚是否有一种通用的机制介导了MVB对所有受体的分选。我们先前的研究表明,凝血酶的G蛋白偶联受体(G蛋白偶联受体)--蛋白酶激活受体1(PAR1)在激活后被内化,并独立于泛素化和泛素结合的ESCRT组分肝细胞生长因子调节的酪氨酸激酶底物和Tsg101而被分选为溶酶体。在这篇文章中,我们报道了PAR1通过ESCRT-III依赖的途径独立于泛素化而与MVB的ILV分类。我们进一步证明了Alix,一个带电的MVB蛋白4-ESCRT-III相互作用的蛋白,通过其中心V结构域与PAR1的YPX3L基序结合,介导溶酶体的降解。本研究揭示了一种新的MVB/溶酶体信号受体分选途径,它绕过了泛素化和泛素结合ESCRT的要求,可能适用于含有YPXnL基序的GPCR子集。
A novel MVB/lysosomal sorting pathway for signaling receptors bypasses the requirement for ubiquitination and ubiquitin-binding ESCRTs and may be broadly applicable to GPCRs containing YPXnL motifs. The sorting of signaling receptors to lysosomes is an essential regulatory process in mammalian cells. During degradation, receptors are modified with ubiquitin and sorted by endosomal sorting complex required for transport (ESCRT)–0, –I, –II, and –III complexes into intraluminal vesicles (ILVs) of multivesicular bodies (MVBs). However, it remains unclear whether a single universal mechanism mediates MVB sorting of all receptors. We previously showed that protease-activated receptor 1 (PAR1), a G protein–coupled receptor (GPCR) for thrombin, is internalized after activation and sorted to lysosomes independent of ubiquitination and the ubiquitin-binding ESCRT components hepatocyte growth factor–regulated tyrosine kinase substrate and Tsg101. In this paper, we report that PAR1 sorted to ILVs of MVBs through an ESCRT-III–dependent pathway independent of ubiquitination. We further demonstrate that ALIX, a charged MVB protein 4–ESCRT-III interacting protein, bound to a YPX3L motif of PAR1 via its central V domain to mediate lysosomal degradation. This study reveals a novel MVB/lysosomal sorting pathway for signaling receptors that bypasses the requirement for ubiquitination and ubiquitin-binding ESCRTs and may be applicable to a subset of GPCRs containing YPXnL motifs.
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