ESCRT-0 marks an APPL1-independent transit route for EGFR between the cell surface and the EEA1-positive early endosome.

ESCRT-0 marks an APPL1-independent transit route for EGFR between the cell surface and the EEA1-positive early endosome.
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DOI:
10.1242/jcs.161786
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发表时间:
2015-02-15
影响因子:
4
通讯作者:
Woodman PG
Woodman PG
中科院分区:
生物学2区
文献类型:
--
作者:
Flores-Rodriguez N;Kenwright DA;Chung PH;Harrison AW;Stefani F;Waigh TA;Allan VJ;Woodman PG

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运输所需的内体分选复合物 (ESCRT)-0 对早期内体内泛素化的 EGFR 进行分选,以便受体可以整合到腔内囊泡中。一个重要的问题是,ESCRT-0 是否仅作用于已经进入液泡早期内体(以 EEA1 的存在为特征)的 EGFR,还是与早期区室中的 EGFR 结合。在这里,我们使用一套软件来确定 ESCRT-0 在亚像素分辨率下的定位,并与其他内吞标记进行基于粒子的共定位分析。我们证明,虽然一些 ESCRT-0 亚基 Hrs(也称为 HGS)与液泡早期内体标记物 EEA1 共定位,但大多数定位于外周 EEA1 阴性内体群体,它们充当将 EGFR 从细胞表面转运到更中央早期内体的中间体。外周 Hrs 标记的内体与含有 APPL1 的内体不同,但与新型内吞接头 SNX15 共同标记。与 ESCRT-0 相比,ESCRT-I 在稍后的时间被招募到含有 EGF 的内体,因为它们移动到更中心的位置,而 ESCRT-III 也被更逐渐地招募。 RNA沉默实验表明ESCRT-0和ESCRT-I对于EGF转运至EEA1内体都很重要。
Endosomal sorting complexes required for transport (ESCRT)-0 sorts ubiquitylated EGFR within the early endosome so that the receptor can be incorporated into intralumenal vesicles. An important question is whether ESCRT-0 acts solely upon EGFR that has already entered the vacuolar early endosome (characterised by the presence of EEA1) or engages EGFR within earlier compartments. Here, we employ a suite of software to determine the localisation of ESCRT-0 at subpixel resolution and to perform particle-based colocalisation analysis with other endocytic markers. We demonstrate that although some of the ESCRT-0 subunit Hrs (also known as HGS) colocalises with the vacuolar early endosome marker EEA1, most localises to a population of peripheral EEA1-negative endosomes that act as intermediates in transporting EGFR from the cell surface to more central early endosomes. The peripheral Hrs-labelled endosomes are distinct from APPL1-containing endosomes, but co-label with the novel endocytic adaptor SNX15. In contrast to ESCRT-0, ESCRT-I is recruited to EGF-containing endosomes at later times as they move to more a central position, whereas ESCRT-III is also recruited more gradually. RNA silencing experiments show that both ESCRT-0 and ESCRT-I are important for the transit of EGF to EEA1 endosomes.
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