PX-RICS Mediates ER-to-Golgi Transport of the N-cadherin/beta-catenin Complex

Overview

Journal Genes Dev

Specialty Molecular Biology

Date 2008 May 3

PMID 18451111

Citations 22

Authors

Tsutomu Nakamura

Tomoatsu Hayashi

Yukiko Nasu-Nishimura

Fumika Sakaue

Yasuyuki Morishita

Toshio Okabe

Susumu Ohwada

Ken Matsuura

Tetsu Akiyama

Affiliations

Soon will be listed here.

Abstract

Cadherins mediate Ca2+-dependent cell-cell adhesion. Efficient export of cadherins from the endoplasmic reticulum (ER) is known to require complex formation with beta-catenin. However, the molecular mechanisms underlying this requirement remain elusive. Here we show that PX-RICS, a beta-catenin-interacting GTPase-activating protein (GAP) for Cdc42, mediates ER-to-Golgi transport of the N-cadherin/beta-catenin complex. Knockdown of PX-RICS expression induced the accumulation of the N-cadherin/beta-catenin complex in the ER and ER exit site, resulting in a decrease in cell-cell adhesion. PX-RICS was also required for ER-to-Golgi transport of the fibroblast growth factor-receptor 4 (FGFR4) associated with N-cadherin. PX-RICS-mediated ER-to-Golgi transport was dependent on its interaction with beta-catenin, phosphatidylinositol-4-phosphate (PI4P), Cdc42, and its novel binding partner gamma-aminobutyric acid type A receptor-associated protein (GABARAP). These results suggest that PX-RICS ensures the efficient entry of the N-cadherin/beta-catenin complex into the secretory pathway, and thereby regulates the amount of N-cadherin available for cell adhesion and FGFR4-mediated signaling.

Citing Articles

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