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- W4380290503 abstract "The small heat shock protein Hsp42 and the t‐SNARE protein Sed5 have central roles in the sequestration of misfolded proteins into insoluble protein deposits in the yeast Saccharomyces cerevisiae . However, whether these proteins/processes interact in protein quality control (PQC) is not known. Here, we show that Sed5 and anterograde trafficking modulate phosphorylation of Hsp42 partially via the MAPK kinase Hog1. Such phosphorylation, specifically at residue S215, abrogated the co‐localization of Hsp42 with the Hsp104 disaggregase, aggregate clearance, chaperone activity, and sequestration of aggregates to IPOD and mitochondria. Furthermore, we found that Hsp42 is hyperphosphorylated in old cells leading to a drastic failure in disaggregation. Old cells also displayed a retarded anterograde trafficking, which, together with slow aggregate clearance and hyperphosphorylation of Hsp42, could be counteracted by Sed5 overproduction. We hypothesize that the breakdown of proper PQC during yeast aging may, in part, be due to a retarded anterograde trafficking leading to hyperphosphorylation of Hsp42." @default.
- W4380290503 created "2023-06-13" @default.
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- W4380290503 date "2023-06-20" @default.
- W4380290503 modified "2023-10-11" @default.
- W4380290503 title "Syntaxin 5‐dependent phosphorylation of the small heat shock protein Hsp42 and its role in protein quality control" @default.
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- W4380290503 doi "https://doi.org/10.1111/febs.16886" @default.
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