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      In vivo kinetics of segregation and polar retention of MS2-GFP-RNA complexes in Escherichia coli.

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          Abstract

          The cytoplasm of Escherichia coli is a crowded, heterogeneous environment. From single cell live imaging, we investigated the spatial kinetics and heterogeneities of synthetic RNA-protein complexes. First, although their known tendency to accumulate at the cell poles does not appear to introduce asymmetries between older and newer cell poles within a cell lifetime, these emerge with cell divisions. This suggests strong polar retention of the complexes, which we verified in their history of positions and mean escape time from the poles. Next, we show that the polar retention relies on anisotropies in the displacement distribution in the region between midcell and poles, whereas the speed is homogeneous along the major cell axis. Afterward, we establish that these regions are at the border of the nucleoid and shift outward with cell growth, due to the nucleoid's replication. Overall, the spatiotemporal kinetics of the complexes, which is robust to suboptimal temperatures, suggests that nucleoid occlusion is a source of dynamic heterogeneities of macromolecules in E. coli that ultimately generate phenotypic differences between sister cells.

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          Author and article information

          Journal
          Biophys. J.
          Biophysical journal
          Elsevier BV
          1542-0086
          0006-3495
          May 06 2014
          : 106
          : 9
          Affiliations
          [1 ] Laboratory of Biosystem Dynamics, Department of Signal Processing, Tampere University of Technology, Tampere, Finland.
          [2 ] Laboratory of Biosystem Dynamics, Department of Signal Processing, Tampere University of Technology, Tampere, Finland. Electronic address: andre.ribeiro@tut.fi.
          Article
          S0006-3495(14)00336-1
          10.1016/j.bpj.2014.03.035
          4017294
          24806925
          92aae559-55eb-408f-99e3-534cf18b1ded
          History

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