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首页> 外文期刊>Current Biology: CB >UBAP1 Is a Component of an Endosome-Specific ESCRT-I Complex that Is Essential for MVB Sorting
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UBAP1 Is a Component of an Endosome-Specific ESCRT-I Complex that Is Essential for MVB Sorting

机译:UBAP1是特定于内体的ESCRT-I复合物的组成部分,该复合物对于MVB分类至关重要

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Endosomal sorting complexes required for transport (ESCRTs) regulate several events involving membrane invagination, including multivesicular body (MVB) biogenesis, viral budding, and cytokinesis [1]. In each case, upstream ESCRTs combine with additional factors, such as Bro1 proteins [2-4], to recruit ESCRT-III and the ATPase VPS4 in order to drive membrane scission [5]. A clue to understanding how such diverse cellular processes might be controlled independently of each other has been the identification of ESCRT isoforms. Mammalian ESCRT-I comprises TSG101, VPS28, VPS37A-D [6-8], and MVB12A/B [9]. These could generate several ESCRT-I complexes, each targeted to a different compartment and able to recruit distinct ESCRT-III proteins. Here we identify a novel ESCRT-I component, ubiquitin-associated protein 1 (UBAP1), which contains a region conserved in MVB12 [10]. UBAP1 binds the endosomal Bro1 protein His domain protein tyrosine phosphatase (HDPTP) [4], but not Alix, a Bro1 protein involved in cytokinesis [11,12]. UBAP1 is required for sorting EGFR to the MVB and for endosomal ubiquitin homeostasis, but not for cytokinesis. UBAP1 is part of a complex that contains a fraction of total cellular TSG101 and that also contains VPS37A but not VPS37C. Hence, the presence of UBAP1, in combination with VPS37A, defines an endosome-specific ESCRT-I complex.
机译:运输所需的内体分选复合物(ESCRT)调节涉及膜内陷的多个事件,包括多囊体(MVB)生物发生,病毒出芽和胞质分裂[1]。在每种情况下,上游ESCRT与其他因素结合,例如Br​​o1蛋白[2-4],以募集ESCRT-III和ATPase VPS4以驱动膜分裂[5]。 ESCRT同工型的鉴定是了解如何可以独立控制这种多样的细胞过程的线索。哺乳动物ESCRT-1包括TSG101,VPS28,VPS37A-D [6-8]和MVB12A / B [9]。这些可以产生几种ESCRT-I复合物,每种复合物靶向不同的区室并能够募集不同的ESCRT-III蛋白。在这里,我们确定了一种新型的ESCRT-1成分,泛素相关蛋白1(UBAP1),其中包含一个在MVB12中保守的区域[10]。 UBAP1结合内体的Bro1蛋白His域蛋白酪氨酸磷酸酶(HDPTP)[4],但不结合Alix,Alix是参与胞质分裂的Bro1蛋白[11,12]。 UBAP1是将EGFR分到MVB和内体泛素稳态所必需的,而不是胞质分裂所需的。 UBAP1是复合物的一部分,该复合物包含全部蜂窝TSG101的一部分,还包含VPS37A,但不包含VPS37C。因此,UBAP1与VPS37A结合的存在定义了内体特异性ESCRT-1复合物。

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