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• W2969883918 abstract "Signaling cascades respond to specific inputs, but also require active interventions to be maintained in their basal/inactive levels in the absence of the activating signal(s). In a screen to search for protein quality control components required for wild-type tolerance to oxidative stress in fission yeast, we have isolated eight gene deletions conferring resistance not only to H2O2 but also to caffeine. We show that dual resistance acquisition is totally or partially dependent on the transcription factor Pap1. Some gene products, such as the ribosomal-ubiquitin fusion protein Ubi1, the E2 conjugating enzyme Ubc2 or the E3 ligase Ubr1, participate in basal ubiquitin labeling of Pap1, and others, such as Rpt4, are non-essential constituents of the proteasome. We demonstrate here that basal nucleo-cytoplasmic shuttling of Pap1, occurring even in the absence of stress, is sufficient for the interaction of the transcription factor with nuclear Ubr1, and we identify a 30 amino acids peptide in Pap1 as the degron for this important E3 ligase. The isolated gene deletions increase only moderately the concentration of the transcription factor, but it is sufficient to enhance basal tolerance to stress, probably by disturbing the inactive stage of this signaling cascade." @default.
• W2969883918 created "2019-08-29" @default.
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• W2969883918 date "2020-01-01" @default.
• W2969883918 modified "2023-10-17" @default.
• W2969883918 title "Identification of ubiquitin-proteasome system components affecting the degradation of the transcription factor Pap1" @default.
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• W2969883918 doi "https://doi.org/10.1016/j.redox.2019.101305" @default.
• W2969883918 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6742857" @default.
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