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Trends Cell Biol. 2012 Jan;22(1):22-32. doi: 10.1016/j.tcb.2011.09.010. Epub 2011 Nov 3.

Protein quality control in the ER: balancing the ubiquitin checkbook.

Author information

1
Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, 9 Cambridge Center, Cambridge, MA 02142, USA.

Abstract

Protein maturation in the endoplasmic reticulum (ER) is subject to stringent quality control. Terminally misfolded polypeptides are usually ejected into the cytoplasm and targeted for destruction by the proteasome. Ubiquitin conjugation is essential for both extraction and proteolysis. We discuss the role of the ubiquitin conjugation machinery in this pathway and focus on the role of ubiquitin ligase complexes as gatekeepers for membrane passage. We then examine the type of ubiquitin modification applied to the misfolded ER protein and the role of de-ubiquitylating enzymes in the extraction of proteins from the ER.

PMID:
22055166
PMCID:
PMC3564647
DOI:
10.1016/j.tcb.2011.09.010
[Indexed for MEDLINE]
Free PMC Article

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