Regulation of retromer recruitment to endosomes by sequential action of Rab5 and Rab7.

Regulation of retromer recruitment to endosomes by sequential action of Rab5 and Rab7.
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DOI:
10.1083/jcb.200804048
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发表时间:
2008-11-03
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Bonifacino JS
Bonifacino JS
中科院分区:
其他
文献类型:
--
作者:
Rojas R;van Vlijmen T;Mardones GA;Prabhu Y;Rojas AL;Mohammed S;Heck AJ;Raposo G;van der Sluijs P;Bonifacino JS

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The retromer complex mediates retrograde transport of transmembrane cargo from endosomes to the trans-Golgi network (TGN). Mammalian retromer is composed of a sorting nexin (SNX) dimer that binds to phosphatidylinositol 3-phosphate–enriched endosomal membranes and a vacuolar protein sorting (Vps) 26/29/35 trimer that participates in cargo recognition. The mammalian SNX dimer is necessary but not sufficient for recruitment of the Vps26/29/35 trimer to membranes. In this study, we demonstrate that the guanosine triphosphatase Rab7 contributes to this recruitment. The Vps26/29/35 trimer specifically binds to Rab7–guanosine triphosphate (GTP) and localizes to Rab7-containing endosomal domains. Interference with Rab7 function causes dissociation of the Vps26/29/35 trimer but not the SNX dimer from membranes. This blocks retrieval of mannose 6-phosphate receptors to the TGN and impairs cathepsin D sorting. Rab5-GTP does not bind to the Vps26/29/35 trimer, but perturbation of Rab5 function causes dissociation of both the SNX and Vps26/29/35 components from membranes through inhibition of a pathway involving phosphatidylinositol 3-kinase. These findings demonstrate that Rab5 and Rab7 act in concert to regulate retromer recruitment to endosomes.
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