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- W2024333362 abstract "To probe the limiting nodes in the chaperoning network which maintains cellular proteostasis, we expressed a dominant negative mutant of heat shock factor 1 (dnHSF1), the regulator of the cytoplasmic proteotoxic stress response. Microarray analysis of non-stressed dnHSF1 cells showed a two- or more fold decrease in the transcript level of 10 genes, amongst which are the (co-)chaperone genes HSP90AA1, HSPA6, DNAJB1 and HSPB1. Glucocorticoid signaling, which requires the Hsp70 and the Hsp90 folding machines, was severely impaired by dnHSF1, but fully rescued by expression of DNAJA1 or DNAJB1, and partially by ST13. Expression of DNAJB6, DNAJB8, HSPA1A, HSPB1, HSPB8, or STIP1 had no effect while HSP90AA1 even inhibited. PTGES3 (p23) inhibited only in control cells. Our results suggest that the DNAJ co-chaperones in particular become limiting in a depleted chaperoning network. Our results also suggest a difference between the transcriptomes of cells lacking HSF1 and cells expressing dnHSF1." @default.
- W2024333362 created "2016-06-24" @default.
- W2024333362 creator A5000437533 @default.
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- W2024333362 date "2010-06-18" @default.
- W2024333362 modified "2023-10-17" @default.
- W2024333362 title "Co-chaperones are limiting in a depleted chaperone network" @default.
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- W2024333362 doi "https://doi.org/10.1007/s00018-010-0430-7" @default.
- W2024333362 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2981734" @default.
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