Role of SNX16 in the dynamics of tubulo-cisternal membrane domains of late endosomes.

Role of SNX16 in the dynamics of tubulo-cisternal membrane domains of late endosomes.
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DOI:
10.1371/journal.pone.0021771
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发表时间:
2011
期刊:
影响因子:
3.7
通讯作者:
Gruenberg J
Gruenberg J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Brankatschk B;Pons V;Parton RG;Gruenberg J

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在本文中,我们报告的PX结构域蛋白SNX16,一个成员的分类连接蛋白家族,是与晚期内体膜。我们发现,SNX16选择性地富集在这个膜系统,其高度动态特性和形成依赖于完整的微管的管池元件。相比之下,SNX16没有被发现的液泡元素,通常含有LBPA,因此推测对应于多泡内体。我们的结论是,SNX16,连同其合作伙伴磷酸肌醇,定义了一个高度动态的子集的晚期内体膜,支持的概念,晚期内体组织在不同的形态和功能区域。我们的数据还表明,SNX16参与小管形成和胆固醇转运以及四跨膜蛋白CD81的运输,这表明该蛋白在晚期内体膜动力学的调节中起作用。
In this paper, we report that the PX domain-containing protein SNX16, a member of the sorting nexin family, is associated with late endosome membranes. We find that SNX16 is selectively enriched on tubulo-cisternal elements of this membrane system, whose highly dynamic properties and formation depend on intact microtubules. By contrast, SNX16 was not found on vacuolar elements that typically contain LBPA, and thus presumably correspond to multivesicular endosomes. We conclude that SNX16, together with its partner phosphoinositide, define a highly dynamic subset of late endosomal membranes, supporting the notion that late endosomes are organized in distinct morphological and functional regions. Our data also indicate that SNX16 is involved in tubule formation and cholesterol transport as well as trafficking of the tetraspanin CD81, suggesting that the protein plays a role in the regulation of late endosome membrane dynamics.
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