A Rab11/Rip11 protein complex regulates apical membrane trafficking via recycling endosomes - PubMed (original) (raw)
A Rab11/Rip11 protein complex regulates apical membrane trafficking via recycling endosomes
R Prekeris et al. Mol Cell. 2000 Dec.
Free article
Abstract
Rab11 is a GTPase that regulates endosomal trafficking to apical plasma membrane domains in polarized epithelial cells. We report the identification of a novel Rab11 effector, Rip11. Rip11 is enriched in polarized epithelial cells where, like Rab11, it is localized to subapical recycling endosomes (ARE) and the apical plasma membrane. Using various transport assays, we demonstrate that Rip11 is important for protein trafficking from ARE to the apical plasma membrane. Rip11 is recruited to ARE by binding to Rab11 as well as through a Mg(2+)-dependent interaction of its C2 domain with neutral phospholipids. The association of Rip11 with membranes is regulated by a phosphorylation and dephosphorylation cycle. We propose a model whereby the Rab11/Rip 11 complex regulates vesicle targeting from the ARE.
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