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• W2116504799 abstract "Accumulation of misfolded oxidant-damaged proteins is characteristic of many diseases and aging. To understand how cells handle postsynthetically damaged proteins, we studied in Saccharomyces cerevisiae the effects on overall protein degradation of shifting from 30 to 38°C, exposure to reactive oxygen species generators (paraquat or cadmium), or lack of superoxide dismutases. Degradation rates of long-lived proteins (i.e., most cell proteins) were not affected by these insults, even when there was widespread oxidative damage to proteins. However, exposure to 38°C, paraquat, cadmium, or deletion of SOD1 enhanced two- to threefold the degradation of newly synthesized proteins. By 1 h after synthesis, their degradation was not affected by these treatments. Degradation of these damaged cytosolic proteins requires the ubiquitin–proteasome pathway, including the E2s UBC4/UBC5, proteasomal subunit RPN10, and the CDC48–UfD1–NPL4 complex. In yeast lacking these components, the nondegraded polypeptides accumulate as aggregates. Thus, many cytosolic proteins proceed through a prolonged “fragile period” during which they are sensitive to degradation induced by superoxide radicals or increased temperatures." @default.
• W2116504799 created "2016-06-24" @default.
• W2116504799 creator A5006962945 @default.
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• W2116504799 date "2008-08-25" @default.
• W2116504799 modified "2023-10-03" @default.
• W2116504799 title "Heat shock and oxygen radicals stimulate ubiquitin-dependent degradation mainly of newly synthesized proteins" @default.
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• W2116504799 doi "https://doi.org/10.1083/jcb.200803022" @default.
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