Actin remodelling controls proteasome homeostasis upon stress

Thomas David Williams, Roberta Cacioppo, Alexander Agrotis, Ailsa Black, Houjiang Zhou, Adrien Rousseau (Lead / Corresponding author)

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Abstract

When cells are stressed, bulk translation is often downregulated to reduce energy demands while stress-response proteins are simultaneously upregulated. To promote proteasome assembly and activity and maintain cell viability upon TORC1 inhibition, 19S regulatory-particle assembly chaperones (RPACs) are selectively translated. However, the molecular mechanism for such selective translational upregulation is unclear. Here, using yeast, we discover that remodelling of the actin cytoskeleton is important for RPAC translation following TORC1 inhibition. mRNA of the RPAC ADC17 is associated with actin cables and is enriched at cortical actin patches under stress, dependent upon the early endocytic protein Ede1. ede1∆ cells failed to induce RPACs and proteasome assembly upon TORC1 inhibition. Conversely, artificially tethering ADC17 mRNA to cortical actin patches enhanced its translation upon stress. These findings suggest that actin-dense structures such as cortical actin patches may serve as a translation platform for a subset of stress-induced mRNAs including regulators of proteasome homeostasis.
Original languageEnglish
Pages (from-to)1077-1087
Number of pages11
JournalNature Cell Biology
Volume24
Early online date23 Jun 2022
DOIs
Publication statusPublished - Jul 2022

Keywords

  • Actin
  • Proteasome
  • Stress signalling
  • Translation

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