Hypochlorous acid activates the heat shock and soxRS systems of Escherichia coli

Article Abstract:

The three Escherichia coli heat shock genes; grpE, dnaK and lon; and the promoter gene of micF, controlled by the soxRS regulon, are activated in the presence of hypochlorous acid. The oxyR and soxRS genes are regulatory circuits in E. coli that fight against oxidative hazards. There is no requirement for oxyR, sodA or sodB in the adaptive response of E. coli to free chlorine. The genetic activation requires an exposure of less than one second to the acid.

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Recovery of culturability of an HOCl-stressed population of Escherichia coli after incubation in phosphate buffer: resuscitation or regrowth?

Article Abstract:

The recovery of culturability by Escherichia coli exposed to hypochlorous acid is investigated. The recovery of viable but nonculturable bacteria is enhanced with phosphate buffer incubation. Ten percent of the initial acid-treated population become culturable after a few days of buffer incubation even without medium supplementation. Whether this recovery is from resuscitation or cannibalism by a subpopulation is the subject of further investigation.

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Induction of a global stress response during the first step of Escherichia coli plate growth

Article Abstract:

A study was conducted to understand the first events that occur when cells grown exponentially in liquid medium are transferred to a solid medium. The results indicate that in order to grow on plates, bacteria must not only adapt to new conditions but also perceive a real stress.

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