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• W1489591743 abstract "To characterize the system(s) responsible for degradation of short-lived and long-lived proteins in mammalian cells, we compared the concentrations of ATP required for the degradation of these classes of proteins in growing hamster fibroblasts. By treating CHEF-18 cells with increasing concentrations of dinitrophenol and 2-deoxyglucose, it was possible to reduce their steady-state ATP content by different amounts (up to 98%). These treatments caused a rapid decrease in the degradation of both short- and long-lived proteins. Removal of the inhibitors led to a prompt restoration of ATP and proteolysis. As ATP content fell below normal levels (about 3.1 mM), rates of proteolysis decreased in a graded biphasic fashion. Reduction in ATP by up to 90% (as may occur in anoxia or injury) decreased proteolysis up to 50%; and with further loss of ATP, protein breakdown fell more sharply. Degradation of both classes of proteins was inhibited by 80% when ATP levels were reduced by 98%. The levels of ATP required for the breakdown of short- and long-lived proteins were indistinguishable. Protein synthesis was much more sensitive to a decrease in ATP content than protein breakdown and fell by 50% when ATP was reduced by only 15%. Chloroquine, an inhibitor of lysosome function, did not reduce the degradation of either class of proteins in growing cells, but it did inhibit the enhanced degradation of long-lived proteins upon removal of serum (in accord with previous studies). Thus, in growing fibroblasts, an ATP-dependent nonlysosomal process appears responsible for the hydrolysis of both short- and long-lived proteins." @default.
• W1489591743 created "2016-06-24" @default.
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• W1489591743 date "1985-03-01" @default.
• W1489591743 modified "2023-10-12" @default.
• W1489591743 title "The ATP dependence of the degradation of short- and long-lived proteins in growing fibroblasts." @default.
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• W1489591743 doi "https://doi.org/10.1016/s0021-9258(19)83626-8" @default.
• W1489591743 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/3972829" @default.
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