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Inducible sfi dependent division inhibition in Escherichia coli

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Summary

Brief exposure of an Escherichia coli tif lon strain to 40° results in subsequent prolonged inhibition of cell division (part of the “SOS response”), which is completely and specifically suppressed by sfiA and sfiB mutations. This sfi dependent division inhibition requires protein synthesis during the 40° incubation period, implying the existence of a tif-inducible protein which results in cell division arrest. sfi dependent division inhibition is also induced early during thymine starvation in tif + cells; at later times a sfi independent mechanism of division arrest is invoked as well.

In lon mutants, known to lack a protease, the sfi dependent division inhibition is amplified, perhaps due to stabilization of the inducible protein involved in division arrest. In these strains the P1 lysogenization defect and the filamentation observed after a nutritional shift-up are sfi dependent, suggesting that P1 infection and nutritional shift-up may also induce the protein involved in division arrest. Bacteria are known to increase in size following a shift-up. Thus the latter observation suggests that the SOS response may be not only a last resort in time of distress but also a means permitting better adaptation of the cells to their environment.

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Authors and Affiliations

  1. Institut de Recherche en Biologie Moléculaire, CNRS, 2, Place Jussieu, F-75221, Paris Cedex 05, France

    Olivier Huisman, Richard D'Ari & Jacqueline George

Authors
  1. Olivier Huisman
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  2. Richard D'Ari
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  3. Jacqueline George
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Additional information

Communicated by B.A. Bridges

After five years of heroic struggle against cancer, Jacqueline George passed away 14 August 1979. Despite weakened health and debilitating therapy she continued to stimulate and participate in the work of the microbial genetics group which she had created

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Huisman, O., D'Ari, R. & George, J. Inducible sfi dependent division inhibition in Escherichia coli . Molec. Gen. Genet. 177, 629–636 (1980). https://doi.org/10.1007/BF00272673

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  • DOI: https://doi.org/10.1007/BF00272673

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