SNX27 Mediates PDZ-directed Sorting from Endosomes to the Plasma Membrane

Overview

Journal J Cell Biol

Specialty Cell Biology

Date 2010 Aug 25

PMID 20733053

Citations 169

Authors

Benjamin E L Lauffer

Cristina Melero

Paul Temkin

Cai Lei

Wanjin Hong

Tanja Kortemme

Mark Von Zastrow

Affiliations

Soon will be listed here.

Abstract

Postsynaptic density 95/discs large/zonus occludens-1 (PDZ) domain-interacting motifs, in addition to their well-established roles in protein scaffolding at the cell surface, are proposed to act as cis-acting determinants directing the molecular sorting of transmembrane cargo from endosomes to the plasma membrane. This hypothesis requires the existence of a specific trans-acting PDZ protein that mediates the proposed sorting operation in the endosome membrane. Here, we show that sorting nexin 27 (SNX27) is required for efficient PDZ-directed recycling of the beta(2)-adrenoreceptor (beta(2)AR) from early endosomes. SNX27 mediates this sorting function when expressed at endogenous levels, and its recycling activity requires both PDZ domain-dependent recognition of the beta(2)AR cytoplasmic tail and Phox homology (PX) domain-dependent association with the endosome membrane. These results identify a discrete role of SNX27 in PDZ-directed recycling of a physiologically important signaling receptor, and extend the concept of cargo-specific molecular sorting in the recycling pathway.

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