Abstract:
:The yeast Rab5 homologue, Vps21p, is known to be involved both in the vacuolar protein sorting (VPS) pathway from the trans-Golgi network to the vacuole, and in the endocytic pathway from the plasma membrane to the vacuole. However, the intracellular location at which these two pathways converge remains unclear. In addition, the endocytic pathway is not completely blocked in yeast cells lacking all Rab5 genes, suggesting the existence of an unidentified route that bypasses the Rab5-dependent endocytic pathway. Here we show that convergence of the endocytic and VPS pathways occurs upstream of the requirement for Vps21p in these pathways. We also identify a previously unidentified endocytic pathway mediated by the AP-3 complex. Importantly, the AP-3-mediated pathway appears mostly intact in Rab5-disrupted cells, and thus works as an alternative route to the vacuole/lysosome. We propose that the endocytic traffic branches into two routes to reach the vacuole: a Rab5-dependent VPS pathway and a Rab5-independent AP-3-mediated pathway.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Toshima JY,Nishinoaki S,Sato Y,Yamamoto W,Furukawa D,Siekhaus DE,Sawaguchi A,Toshima Jdoi
10.1038/ncomms4498subject
Has Abstractpub_date
2014-03-25 00:00:00pages
3498issn
2041-1723pii
ncomms4498journal_volume
5pub_type
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