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- W2012059904 abstract "The degradation of slowly turning over 125I-lactoperoxidase-labeled plasma membrane polypeptides in response to reversible temperature and lysosomotropic inhibitors was studied in rat hepatoma cultures. Cells were radiolabeled and left for 24 h to allow the removal of rapidly degraded proteins. Remaining trichloroacetic acid-precipitable protein was degraded (t 1/2 = 40-68 h) by an apparent first order process 60-86% sensitive to 10 mM NH4Cl or 5 mM methylamine and greater than 95% inhibited by temperature reduction to 18 degrees C. Thus, membrane proteins are selected for degradation in a time-dependent manner by a system which is sensitive to both 18 degrees C and to lysosomotropic amines. When inhibitory conditions were removed after 40-48 h, degradation of 125I-labeled protein resumed at the same rate as that seen in their absence. Since membrane proteins do not exhibit accelerated degradation after removal of inhibitory conditions, there can be no marking or sorting of those proteins destined for degradation during the 40-h exposure to inhibitory conditions. Exposure to amines or 18 degrees C did not affect the position of two-dimensionally resolved labeled polypeptides. Fractionation of labeled cells on Percoll gradients after 40 h of exposure to low temperature or amines showed that labeled protein remained in the plasma membrane fractions of the gradient although shifted to a slightly lower buoyant density in the presence of amines. These results support the notion that selection of plasma membrane proteins for degradation requires their internalization into acidic vesicles. Lysosomotropic amines and reduced temperature interfere with the selection process by preventing membrane fusion events." @default.
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- W2012059904 date "1988-06-01" @default.
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- W2012059904 title "Dissection of membrane protein degradation mechanisms by reversible inhibitors." @default.
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- W2012059904 doi "https://doi.org/10.1016/s0021-9258(18)68371-1" @default.
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