Aggregation of CAT tails blocks their degradation and causes proteotoxicity in S. cerevisiae


Autoři: Cole S. Sitron aff001;  Joseph H. Park aff001;  Jenna M. Giafaglione aff001;  Onn Brandman aff001
Působiště autorů: Department of Biochemistry, Stanford University, Stanford, CA, United States of America aff001;  Department of Chemical & Systems Biology, Stanford University, Stanford, CA, United States of America aff002
Vyšlo v časopise: PLoS ONE 15(1)
Kategorie: Research Article
doi: 10.1371/journal.pone.0227841

Souhrn

The Ribosome-associated Quality Control (RQC) pathway co-translationally marks incomplete polypeptides from stalled translation with two signals that trigger their proteasome-mediated degradation. The E3 ligase Ltn1 adds ubiquitin and Rqc2 directs the large ribosomal subunit to append carboxy-terminal alanine and threonine residues (CAT tails). When excessive amounts of incomplete polypeptides evade Ltn1, CAT-tailed proteins accumulate and can self-associate into aggregates. CAT tail aggregation has been hypothesized to either protect cells by sequestering potentially toxic incomplete polypeptides or harm cells by disrupting protein homeostasis. To distinguish between these possibilities, we modulated CAT tail aggregation in Saccharomyces cerevisiae with genetic and chemical tools to analyze CAT tails in aggregated and un-aggregated states. We found that enhancing CAT tail aggregation induces proteotoxic stress and antagonizes degradation of CAT-tailed proteins, while inhibiting aggregation reverses these effects. Our findings suggest that CAT tail aggregation harms RQC-compromised cells and that preventing aggregation can mitigate this toxicity.

Klíčová slova:

Flow cytometry – Immunoblotting – Polypeptides – Ribosomes – Saccharomyces cerevisiae – Soil perturbation – Threonine – Yeast


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2020 Číslo 1