Journal
JOURNAL OF CELL SCIENCE
Volume 133, Issue 22, Pages -Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.251983
Keywords
Endoplasmic reticulum; Membrane protein; Protein folding; Ribosome; Translation
Categories
Funding
- UK Medical Research Council [MRC_UP_1201/10]
- MRC [MC_UP_1201/10] Funding Source: UKRI
Ask authors/readers for more resources
Protein synthesis is an energetically costly, complex and risky process. Aberrant protein biogenesis can result in cellular toxicity and disease, with membrane-embedded proteins being particularly challenging for the cell. In order to protect the cell from consequences of defects in membrane proteins, quality control systems act to maintain protein homeostasis. The majority of these pathways act post-translationally; however, recent evidence reveals that membrane proteins are also subject to co-translational quality control during their synthesis in the endoplasmic reticulum (ER). This newly identified quality control pathway employs components of the cytosolic ribosome-associated quality control (RQC) machinery but differs from canonical RQC in that it responds to biogenesis state of the substrate rather than mRNA aberrations. This ER-associated RQC (ER-RQC) is sensitive to membrane protein misfolding and malfunctions in the ER insertion machinery. In this Review, we discuss the advantages of co-translational quality control of membrane proteins, as well as potential mechanisms of substrate recognition and degradation. Finally, we discuss some outstanding questions concerning future studies of ER-RQC of membrane proteins.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available