RAB31 marks and controls an ESCRT-independent exosome pathway.

RAB31 marks and controls an ESCRT-independent exosome pathway.
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RAB31 标记并控制不依赖于 ESCRT 的外泌体通路。

DOI:
10.1038/s41422-020-00409-1
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发表时间:
2021-03
期刊:
影响因子:
44.1
通讯作者:
Kang T
Kang T
中科院分区:
生物学1区
文献类型:
--
作者:
Wei D;Zhan W;Gao Y;Huang L;Gong R;Wang W;Zhang R;Wu Y;Gao S;Kang T

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外泌体在多泡内体(MVE)内作为管腔内囊泡(ILV)产生,并在MVE与细胞膜融合期间分泌。外泌体生物发生的机制仍然很少探索。在这里,我们确定RAB31标记和控制ESCRT独立的外泌体途径。由表皮生长因子受体(EGFR)磷酸化的活性RAB 31接合脂筏微结构域中的flotillin蛋白,以驱动EGFR进入MVE以形成ILV,其独立于ESCRT(转运所需的内体分选复合物)机制。活性RAB 31与SPFH结构域相互作用,并通过Flotilin蛋白的Flotilin结构域驱动ILV形成。同时,RAB 31将GTP酶激活蛋白TBC1D2B募集到RAB7,从而阻止MVE与溶酶体融合,并使ILV作为外泌体分泌。这些发现证实了RAB 31在外泌体的生物发生中具有双重功能:驱动ILV形成和抑制MVE降解,为更好地理解外泌体生物发生提供了一个精致的框架。
Exosomes are generated within the multivesicular endosomes (MVEs) as intraluminal vesicles (ILVs) and secreted during the fusion of MVEs with the cell membrane. The mechanisms of exosome biogenesis remain poorly explored. Here we identify that RAB31 marks and controls an ESCRT-independent exosome pathway. Active RAB31, phosphorylated by epidermal growth factor receptor (EGFR), engages flotillin proteins in lipid raft microdomains to drive EGFR entry into MVEs to form ILVs, which is independent of the ESCRT (endosomal sorting complex required for transport) machinery. Active RAB31 interacts with the SPFH domain and drives ILV formation via the Flotillin domain of flotillin proteins. Meanwhile, RAB31 recruits GTPase-activating protein TBC1D2B to inactivate RAB7, thereby preventing the fusion of MVEs with lysosomes and enabling the secretion of ILVs as exosomes. These findings establish that RAB31 has dual functions in the biogenesis of exosomes: driving ILVs formation and suppressing MVEs degradation, providing an exquisite framework to better understand exosome biogenesis.
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