Abstract
In eukaryotes, a cytosolic ribosome quality control complex recycles erroneously stalled ribosomes and modifies faulty nascent chains by ubiquitination and by C-terminal Ala- and Thr-extension (CAT-tailing). Reported recently in Cell, Izawa et al. identify cytosolic Vms1 (VCP/Cdc48-associated mitochondrial stress-responsive 1) as an inhibitor of CAT-tailing, which prevents mitochondrial dysfunction caused by imported CAT-tailed polypeptides.
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