The Par3 polarity protein is an exocyst receptor essential for mammary cell survival.

Abstract:

:The exocyst is an essential component of the secretory pathway required for delivery of basolateral proteins to the plasma membranes of epithelial cells. Delivery occurs adjacent to tight junctions (TJ), suggesting that it recognizes a receptor at this location. However, no such receptor has been identified. The Par3 polarity protein associates with TJs but has no known function in membrane traffic. We now show that, unexpectedly, Par3 is essential for mammary cell survival. Par3 silencing causes apoptosis, triggered by phosphoinositide trisphosphate depletion and decreased Akt phosphorylation, resulting from failure of the exocyst to deliver basolateral proteins to the cortex. A small region of PAR3 binds directly to Exo70 and is sufficient for exocyst docking, membrane-protein delivery and cell survival. PAR3 lacking this domain can associate with the cortex but cannot support exocyst function. We conclude that Par3 is the long-sought exocyst receptor required for targeted membrane-protein delivery.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ahmed SM,Macara IG

doi

10.1038/ncomms14867

subject

Has Abstract

pub_date

2017-03-30 00:00:00

pages

14867

issn

2041-1723

pii

ncomms14867

journal_volume

8

pub_type

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