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© Research
Publication : Current genetics

The ribosome-bound quality control complex: from aberrant peptide clearance to proteostasis maintenance

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Current genetics - 20 May 2017

Defenouillère Q, Fromont-Racine M

Link to Pubmed [PMID] – 28528489

Curr. Genet. 2017 May;

Proteostasis in eukaryotes is maintained by compartment-specific quality control pathways, which enable the refolding or the degradation of defective polypeptides to prevent the toxicity that may arise from their aggregation. Among these processes, translational protein quality control is performed by the Ribosome-bound Quality Control complex (RQC), which recognizes nascent peptides translated from aberrant mRNAs, polyubiquitylates these aberrant peptides, extracts them from the stalled 60S subunit and finally escorts them to the proteasome for degradation. In this review, we focus on the mechanism of action of the RQC complex from stalled 60S binding to aberrant peptide delivery to the proteasome and describe the cellular consequences of a deficiency in the RQC pathway, such as aberrant protein aggregation. In addition, this review covers the recent discoveries concerning the role of cytosolic chaperones, as well as Tom1, to prevent the accumulation of aberrant protein aggregates in case of a deficiency in the RQC pathway.

https://www.ncbi.nlm.nih.gov/pubmed/28528489