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Identification of a hypochlorite-specific transcription factor from Escherichia coli.


ABSTRACT: Hypochlorite is a powerful oxidant produced by neutrophils to kill invading microorganisms. Despite this important physiological role of HOCl in fighting bacterial infections, no hypochlorite-specific stress response has been identified yet. Here, we identified a hypochlorite-responsive transcription factor, YjiE, which is conserved in proteobacteria and eukaryotes. YjiE forms unusual dodecameric ring-like structures in vitro that undergo large DNA-induced conformational changes to form dimers and tetramers as shown by transmission electron microscopy and analytical ultracentrifugation. Such smaller oligomers are predominant in hypochlorite-stressed cells and are the active species as shown by fluorescence anisotropy and analytical ultracentrifugation. YjiE regulates a large number of genes upon hypochlorite stress. Among them are genes involved in cysteine, methionine biosynthesis, and sulfur metabolism (up-regulated) and genes involved in iron acquisition and homeostasis (down-regulated), thus supposedly replenishing oxidized metabolites and decreasing the hypochlorite-mediated amplification of intracellular reactive oxygen species. As a result, YjiE specifically confers hypochlorite resistance to E. coli cells. Thus, to our knowledge, YjiE is the first described hypochlorite-specific transcription factor.

SUBMITTER: Gebendorfer KM 

PROVIDER: S-EPMC3307268 | biostudies-literature | 2012 Feb

REPOSITORIES: biostudies-literature

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Identification of a hypochlorite-specific transcription factor from Escherichia coli.

Gebendorfer Katharina M KM   Drazic Adrian A   Le Yan Y   Gundlach Jasmin J   Bepperling Alexander A   Kastenmüller Andreas A   Ganzinger Kristina A KA   Braun Nathalie N   Franzmann Titus M TM   Winter Jeannette J  

The Journal of biological chemistry 20120104 9


Hypochlorite is a powerful oxidant produced by neutrophils to kill invading microorganisms. Despite this important physiological role of HOCl in fighting bacterial infections, no hypochlorite-specific stress response has been identified yet. Here, we identified a hypochlorite-responsive transcription factor, YjiE, which is conserved in proteobacteria and eukaryotes. YjiE forms unusual dodecameric ring-like structures in vitro that undergo large DNA-induced conformational changes to form dimers a  ...[more]

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