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- W2055582566 abstract "<h3>Abstract</h3> Inside prokaryotic cells, passive translational diffusion typically limits the rates with which cytoplasmic proteins can reach their locations. Diffusion is thus fundamental to most cellular processes, but the understanding of protein mobility in the highly crowded and non-homogeneous environment of a bacterial cell is still limited. Here we investigated the mobility of a large set of proteins in the cytoplasm of <i>Escherichia coli</i>, by employing fluorescence correlation spectroscopy (FCS) combined with simulations and theoretical modeling. We conclude that cytoplasmic protein mobility could be well described by Brownian diffusion in the confined geometry of the bacterial cell and at the high viscosity imposed by macromolecular crowding. We observed similar size dependence of protein diffusion for the majority of tested proteins, whether native or foreign to <i>E. coli</i>, and, for the faster-diffusing proteins, it is well consistent with the Stokes-Einstein relation once taking into account the specific dumbbell shape of protein fusions. Pronounced subdiffusion and hindered mobility are only observed for proteins with extensive interactions within the cytoplasm. Finally, while protein diffusion becomes markedly faster in actively growing cells, at high temperature, or upon treatment with rifampicin, and slower at high osmolarity, all of these perturbations affect proteins of different sizes in the same proportions, which could thus be described as changes of a well-defined cytoplasmic viscosity." @default.
- W2055582566 created "2016-06-24" @default.
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- W2055582566 date "2003-12-01" @default.
- W2055582566 modified "2023-10-14" @default.
- W2055582566 title "Cutaneous larva migrans of the penis" @default.
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- W2055582566 doi "https://doi.org/10.1136/sti.79.6.500" @default.
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