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- W2891055129 abstract "Escherichia coli swarm on semi-solid surfaces with the aid of flagella. It has been hypothesized that swarmer cells overcome the increased viscous drag near surfaces by developing higher flagellar thrust and by promoting surface wetness with the aid of a flagellar switch. The switch enables reversals between clockwise (CW) and counterclockwise (CCW) directions of rotation of the flagellar motor. Here, we measured the behavior of flagellar motors in swarmer cells. Results indicated that although the torque was similar to that in planktonic cells, the tendency to rotate CCW was higher in swarmer cells. This suggested that swarmers likely have a smaller pool of phosphorylated CheY. Results further indicated that the upregulation of the flagellin gene was not critical for flagellar thrust or swarming. Consistent with earlier reports, moisture added to the swarm surface restored swarming in a CCW-only mutant, but not in a FliG mutant that rotated motors CW-only (FliGCW). Fluorescence assays revealed that FliGCW cells grown on agar surfaces carried fewer flagella than planktonic FliGCW cells. The surface-dependent reduction in flagella correlated with a reduction in the number of putative flagellar preassemblies. These results hint toward a possibility that the conformational dynamics of switch proteins play a role in the proper assembly of flagellar complexes and flagellar export, thereby aiding bacterial swarming." @default.
- W2891055129 created "2018-09-27" @default.
- W2891055129 creator A5017705135 @default.
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- W2891055129 creator A5066705577 @default.
- W2891055129 creator A5070005199 @default.
- W2891055129 date "2018-09-18" @default.
- W2891055129 modified "2023-09-26" @default.
- W2891055129 title "Switching and Torque Generation in Swarming E. coli" @default.
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- W2891055129 doi "https://doi.org/10.3389/fmicb.2018.02197" @default.
- W2891055129 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6153309" @default.
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