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The ubiquitin ligase deltex-3l regulates endosomal sorting of the G protein–coupled receptor CXCR4

机译:泛素连接酶DELTEX-3L调节G蛋白偶联受体CXCR4的内体分选

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G protein–coupled receptor (GPCR) sorting into the degradative pathway is important for limiting the duration and magnitude of signaling. Agonist activation of the GPCR CXCR4 induces its rapid ubiquitination and sorting to lysosomes via the endosomal sorting complex required for transport (ESCRT) pathway. We recently reported that ESCRT-0 ubiquitination is linked to the efficiency with which CXCR4 is sorted for lysosomal degradation; however mechanistic insight is lacking. Here we define a novel role for the really interesting new gene–domain E3 ubiquitin ligase deltex-3-like (DTX3L) in regulating CXCR4 sorting from endosomes to lysosomes. We show that DTX3L localizes to early endosomes upon CXCR4 activation and interacts directly with and inhibits the activity of the E3 ubiquitin ligase atrophin-1 interacting protein 4. This serves to limit the extent to which ESCRT-0 is ubiquitinated and is able to sort CXCR4 for lysosomal degradation. Therefore we define a novel role for DTX3L in GPCR endosomal sorting and reveal an unprecedented link between two distinct E3 ubiquitin ligases to control the activity of the ESCRT machinery.
机译:将G蛋白偶联受体(GPCR)分类到降解途径中对于限制信号传导的持续时间和大小是重要的。 GPCR CXCR4的激动激活诱导其快速泛素化并通过转运(ESCRT)途径所需的内体分选复合物分选于溶酶体。我们最近报道,ESCRT-0泛素化与CXCR4分选用于溶酶体降解的效率相关联。但是机械洞察力缺乏。在这里,我们为真正有趣的新基因结构域E3泛素连接酶DELEX-3样(DTX3L)定义了对溶酶体的CXCR4分选进行调节的新的新的基因域E3样(DTX3L)。我们表明DTX3L在CXCR4活化时定位于早期的底皮物,并直接与E3泛素连接酶腹腔蛋白-1相互作用蛋白4的活性相互作用。这是限制ESCRT-0泛染的程度,并且能够对CXCR4进行排序的程度。用于溶酶体降解。因此,我们为GPCR内体分选中的DTX3L定义了一种新的作用,并揭示了两个不同E3泛素连接酶之间的前所未有的联系,以控制Escrt机械的活性。

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