Journal
TRENDS IN CELL BIOLOGY
Volume 22, Issue 1, Pages 22-32Publisher
ELSEVIER SCIENCE LONDON
DOI: 10.1016/j.tcb.2011.09.010
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Funding
- National Institutes of Health
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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.
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