Contribution of dps to acid stress tolerance and oxidative stress tolerance in Escherichia coli O157:H7

Article Abstract:

Results show that survival of Escherichia coli O157:H7 mutants is decreased because they lack Dps gene or the encoded protein. Data suggest that Dps mediates acid tolerance and by implication oxidative stress protection as well.

South Korea, Oxidation, Physiological, Physiological oxidation, Stress (Physiology)

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Vesicle-mediated transfer of virulence genes from Escherichia coli O157:H7 to other enteric bacteria

Article Abstract:

Research reveals that vesicles shed by the gram-negative bacteria contain genetic material that can be transferred to recipient cells in which the donor genes are expressed. Data show that the genetic material also transfers virulence genes and antibiotic resistance and the transformed bacteria exhibit sixfold higher cytotoxicity.

Virulence (Microbiology), Membranes (Biology), Bacterial transformation

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Reduction of acid tolerance by tetracycline in Escherichia coli expressing tetA(C) is reversed by cations

Article Abstract:

TetA(C) reduced acid tolerance when tetracycline was present, suppressed rpoS expression, and increased the concentration of total soluble proteins in stationary phase Escherichia coli. The suppression of acid tolerance was reversed by 85mM sodium, potassium, magnesium and calcium ions but not by 85mM sucrose.

Pharmaceutical Preparation Manufacturing, Pharmaceutical preparations, Tetracycline Preparations, Tetracycline, Tetracyclines, Chemical properties

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