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. 1993 Jan;175(1):214–221. doi: 10.1128/jb.175.1.214-221.1993

Osmotic repression of anaerobic metabolic systems in Escherichia coli.

G Gouesbet 1, H Abaibou 1, L F Wu 1, M A Mandrand-Berthelot 1, C Blanco 1
PMCID: PMC196116  PMID: 8416896

Abstract

The influence of the osmolarity of the growth medium on anaerobic fermentation and nitrate respiratory pathways was analyzed. The levels of several enzymes, including formate dehydrogenase, hydrogenase, and nitrate reductase, plus a nickel uptake system were examined, as was the expression of the corresponding structural and regulatory genes. While some functions appear to be only moderately affected by an increase in osmolarity, others were found to vary considerably. An increase in the osmolarity of the medium inhibits both fermentation and anaerobic respiratory pathways, though in a more dramatic fashion for the former. fnr expression is affected by osmolarity, but the repression of anaerobic gene expression was shown to be independent of FNR regulatory protein, at least for hyd-17 and fdhF. This repression could be mediated by the intracellular concentration of potassium and is reversed by glycine betaine.

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Selected References

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