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Chp1 is a dedicated chaperone at the ribosome that safeguards eEF1A biogenesis

Minoia, Melania ; Quintana-Cordero, Jany ; Jetzinger, Katharina ; Kotan, Ilgin Eser ; Turnbull, Kathryn Jane ; Ciccarelli, Michela ; Masser, Anna E ; Liebers, Dorina ; Gouarin, Eloïse and Czech, Marius , et al. (2024) In Nature Communications 15(1).
Abstract

Cotranslational protein folding depends on general chaperones that engage highly diverse nascent chains at the ribosomes. Here we discover a dedicated ribosome-associated chaperone, Chp1, that rewires the cotranslational folding machinery to assist in the challenging biogenesis of abundantly expressed eukaryotic translation elongation factor 1A (eEF1A). Our results indicate that during eEF1A synthesis, Chp1 is recruited to the ribosome with the help of the nascent polypeptide-associated complex (NAC), where it safeguards eEF1A biogenesis. Aberrant eEF1A production in the absence of Chp1 triggers instant proteolysis, widespread protein aggregation, activation of Hsf1 stress transcription and compromises cellular fitness. The expression... (More)

Cotranslational protein folding depends on general chaperones that engage highly diverse nascent chains at the ribosomes. Here we discover a dedicated ribosome-associated chaperone, Chp1, that rewires the cotranslational folding machinery to assist in the challenging biogenesis of abundantly expressed eukaryotic translation elongation factor 1A (eEF1A). Our results indicate that during eEF1A synthesis, Chp1 is recruited to the ribosome with the help of the nascent polypeptide-associated complex (NAC), where it safeguards eEF1A biogenesis. Aberrant eEF1A production in the absence of Chp1 triggers instant proteolysis, widespread protein aggregation, activation of Hsf1 stress transcription and compromises cellular fitness. The expression of pathogenic eEF1A2 variants linked to epileptic-dyskinetic encephalopathy is protected by Chp1. Thus, eEF1A is a difficult-to-fold protein that necessitates a biogenesis pathway starting with dedicated folding factor Chp1 at the ribosome to protect the eukaryotic cell from proteostasis collapse.

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publishing date
type
Contribution to journal
publication status
published
subject
in
Nature Communications
volume
15
issue
1
article number
1382
publisher
Nature Publishing Group
external identifiers
  • scopus:85185236115
  • pmid:38360885
ISSN
2041-1723
DOI
10.1038/s41467-024-45645-w
language
English
LU publication?
yes
id
fe2c8b74-f8e6-4db5-bcd9-dfc8c1367869
date added to LUP
2024-02-16 11:02:38
date last changed
2024-04-12 09:27:46
@article{fe2c8b74-f8e6-4db5-bcd9-dfc8c1367869,
  abstract     = {{<p>Cotranslational protein folding depends on general chaperones that engage highly diverse nascent chains at the ribosomes. Here we discover a dedicated ribosome-associated chaperone, Chp1, that rewires the cotranslational folding machinery to assist in the challenging biogenesis of abundantly expressed eukaryotic translation elongation factor 1A (eEF1A). Our results indicate that during eEF1A synthesis, Chp1 is recruited to the ribosome with the help of the nascent polypeptide-associated complex (NAC), where it safeguards eEF1A biogenesis. Aberrant eEF1A production in the absence of Chp1 triggers instant proteolysis, widespread protein aggregation, activation of Hsf1 stress transcription and compromises cellular fitness. The expression of pathogenic eEF1A2 variants linked to epileptic-dyskinetic encephalopathy is protected by Chp1. Thus, eEF1A is a difficult-to-fold protein that necessitates a biogenesis pathway starting with dedicated folding factor Chp1 at the ribosome to protect the eukaryotic cell from proteostasis collapse.</p>}},
  author       = {{Minoia, Melania and Quintana-Cordero, Jany and Jetzinger, Katharina and Kotan, Ilgin Eser and Turnbull, Kathryn Jane and Ciccarelli, Michela and Masser, Anna E and Liebers, Dorina and Gouarin, Eloïse and Czech, Marius and Hauryliuk, Vasili and Bukau, Bernd and Kramer, Günter and Andréasson, Claes}},
  issn         = {{2041-1723}},
  language     = {{eng}},
  month        = {{02}},
  number       = {{1}},
  publisher    = {{Nature Publishing Group}},
  series       = {{Nature Communications}},
  title        = {{Chp1 is a dedicated chaperone at the ribosome that safeguards eEF1A biogenesis}},
  url          = {{http://dx.doi.org/10.1038/s41467-024-45645-w}},
  doi          = {{10.1038/s41467-024-45645-w}},
  volume       = {{15}},
  year         = {{2024}},
}