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Proteotoxicity from aberrant ribosome biogenesis compromises cell fitness

Journal Article · · eLife
DOI:https://doi.org/10.7554/eLife.43002· OSTI ID:1502812
 [1];  [2];  [3];  [3];  [2];  [4];  [2]
  1. Harvard Medical School, Boston, MA (United States); Harvard Univ., Cambridge, MA (United States); CABBI
  2. Harvard Medical School, Boston, MA (United States)
  3. Princeton Univ., Princeton, NJ (United States)
  4. Whitehead Inst. for Biomedical Research, Cambridge, MA (United States); Univ. of Chicago, Chicago, IL (United States)

To achieve maximal growth, cells must manage a massive economy of ribosomal proteins (r-proteins) and RNAs (rRNAs) to produce thousands of ribosomes every minute. Although ribosomes are essential in all cells, natural disruptions to ribosome biogenesis lead to heterogeneous phenotypes. Here, we model these perturbations in Saccharomyces cerevisiae and show that challenges to ribosome biogenesis result in acute loss of proteostasis. Imbalances in the synthesis of r-proteins and rRNAs lead to the rapid aggregation of newly synthesized orphan r-proteins and compromise essential cellular processes, which cells alleviate by activating proteostasis genes. Exogenously bolstering the proteostasis network increases cellular fitness in the face of challenges to ribosome assembly, demonstrating the direct contribution of orphan r-proteins to cellular phenotypes. With this being said, we propose that ribosome assembly is a key vulnerability of proteostasis maintenance in proliferating cells that may be compromised by diverse genetic, environmental, and xenobiotic perturbations that generate orphan r-proteins.

Research Organization:
Univ. of Illinois, Champaign, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
SC0018420
OSTI ID:
1502812
Journal Information:
eLife, Journal Name: eLife Vol. 8; ISSN 2050-084X
Publisher:
eLife Sciences Publications, Ltd.Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (4)

rRNA expansion segment 27Lb modulates the factor recruitment capacity of the yeast ribosome and shapes the proteome journal January 2020
Dosage compensation plans: protein aggregation provides additional insurance against aneuploidy journal August 2019
Cytoplasmic protein misfolding titrates Hsp70 to activate nuclear Hsf1 journal September 2019
rRNA expansion segment 27Lb modulates the factor recruitment capacity of the yeast ribosome and shapes the proteome. text January 2020

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