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- W2064421218 abstract "The ubiquitin–proteasome system governs the half-life of most cellular proteins. Calorie restriction (CR) extends the maximum life span of a variety of species and prevents oxidized protein accumulation. We studied the effects of CR on the ubiquitin–proteasome system and protein turnover in aging Saccharomyces cerevisiae. CR increased chronological life span as well as proteasome activity compared to control cells. The levels of protein carbonyls, a marker of protein oxidation, and those of polyubiquitinated proteins were modulated by CR. Controls, but not CR cells, exhibited a significant increase in oxidized proteins. In keeping with decreased proteasome activity, polyubiquitinated proteins were increased in young control cells compared to time-matched CR cells, but were profoundly decreased in aged control cells despite decreased proteasomal activity. This finding is related to a decreased polyubiquitination ability due to the impairment of the ubiquitin-activating enzyme in aged control cells, probably related to a more oxidative microenvironment. CR preserves the ubiquitin–proteasome system activity. Overall, we found that aging and CR modulate many aspects of protein modification and turnover." @default.
- W2064421218 created "2016-06-24" @default.
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- W2064421218 date "2011-08-01" @default.
- W2064421218 modified "2023-09-23" @default.
- W2064421218 title "Aging and calorie restriction modulate yeast redox state, oxidized protein removal, and the ubiquitin–proteasome system" @default.
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- W2064421218 doi "https://doi.org/10.1016/j.freeradbiomed.2011.05.035" @default.
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