The effect of osmotic shock on the expression of genes in the lux regulon of marine bacteria Vibrio fischeri was studied in cells ofEscherichia coli. Bioluminescence of cells was shown to drastically increase, when cells were exposed to osmotic shock at the early logarithmic growth phase, at far lower optic densities as compared to the critical optic density characteristic. The expression of lux genes induced by osmotic shock is determined by the two-component regulatory system RcsC–RcsB. A nucleotide sequence in the regulatory region of the luxR gene homologous to the RcsB-box consensus of E. coli is assumed to be a primary site for this system.
Russian Journal of Genetics – Springer Journals
Published: Oct 7, 2004
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