We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Sorting nexin 17 facilitates LRP recycling in the early endosome.
- Authors
van Kerkhof, Peter; Lee, Jiyeon; McCormick, Lynn; Tetrault, Elena; Lu, Wenyan; Schoenfish, Marissa; Oorschot, Viola; Strous, Ger J; Klumperman, Judith; Bu, Guojun
- Abstract
The low-density lipoprotein (LDL) receptor-related protein (LRP) is a multiligand endocytic receptor and a member of the LDL receptor family. Here we show that sorting nexin 17 (Snx 17) is part of the cellular sorting machinery that regulates cell surface levels of LRP by promoting its recycling. While the phox (PX) domain of Snx 17 interacts with phosphatidylinositol-3-phosphate for membrane association, the FERM domain and the carboxyl-terminal region participate in LRP binding. Immunoelectron microscopy shows that the membrane-bound fraction of Snx 17 is localized to the limiting membrane and recycling tubules of early endosomes. The NPxY motif, proximal to the plasma membrane in the LRP cytoplasmic tail, is identified as the Snx 17-binding motif. Functional mutation of this motif did not interfere with LRP endocytosis, but decreased LRP recycling from endosomes, resulting in increased lysosomal degradation. Similar effects are found after knockdown of endogenous Snx 17 expression by short interfering RNA. We conclude that Snx 17 binds to a motif in the LRP tail distinct from the endocytosis signals and promotes LRP sorting to the recycling pathway in the early endosomes.
- Publication
The EMBO journal, 2005, Vol 24, Issue 16, p2851
- ISSN
0261-4189
- Publication type
Journal Article
- DOI
10.1038/sj.emboj.7600756