The ART-Rsp5 Ubiquitin Ligase Network Comprises a Plasma Membrane Quality Control System That Protects Yeast Cells from Proteotoxic Stress

Overview

Journal Elife

Specialty Biology

Date 2013 Apr 20

PMID 23599894

Citations 84

Authors

Yingying Zhao

Jason A MacGurn

Max Liu

Scott Emr

Affiliations

Soon will be listed here.

Abstract

Secretory cargo that cannot fold properly in the ER are selectively targeted for removal by a well-studied ER-associated degradation pathway, or ERAD. In contrast, very little is known about post-ER quality control mechanisms for damaged or misfolded integral membrane proteins. Here we describe a quality control function of the Rsp5-ART ubiquitin ligase adaptor network that functions to protect plasma membrane (PM) integrity. Failure to mediate this protective response during heat stress leads to toxic accumulation of misfolded integral membrane proteins at the cell surface, which causes loss of PM integrity and cell death. Thus, the Rsp5-ART network comprises a PM quality control system that works together with sequential quality control pathways in the ER and Golgi to (i) target the degradation of proteins that have exceeded their functional lifetime due to damage and/or misfolding and (ii) limit the toxic accumulation of specific proteins at the cell surface during proteotoxic stress. DOI:http://dx.doi.org/10.7554/eLife.00459.001.

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