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- W4367302261 abstract "Summary It has been proposed that the concentration of proteins in the cytoplasm maximizes the speed of important biochemical reactions. Here we have used the Xenopus extract system, which can be diluted or concentrated to yield a range of cytoplasmic protein concentrations, to test the effect of cytoplasmic concentration on mRNA translation and protein degradation. We found that protein synthesis rates are maximal in ∼1x cytoplasm, whereas protein degradation continues to rise to an optimal concentration of ∼1.8x. This can be attributed to the greater sensitivity of translation to cytoplasmic viscosity, perhaps because it involves unusually large macromolecular complexes like polyribosomes. The different concentration optima sets up a negative feedback homeostatic system, where increasing the cytoplasmic protein concentration above the 1x physiological level increases the viscosity of the cytoplasm, which selectively inhibits translation and drives the system back toward the 1x set point." @default.
- W4367302261 created "2023-04-29" @default.
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- W4367302261 date "2023-04-28" @default.
- W4367302261 modified "2023-10-10" @default.
- W4367302261 title "Protein homeostasis from diffusion-dependent control of protein synthesis and degradation" @default.
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- W4367302261 doi "https://doi.org/10.1101/2023.04.24.538146" @default.
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