PMID: 9435054Jan 22, 1998Paper

Repression of phenol catabolism by organic acids in Ralstonia eutropha

Applied and Environmental Microbiology
F AmpeN D Lindley

Abstract

During batch growth of Ralstonia eutropha (previously named Alcaligenes eutrophus) on phenol in the presence of acetate, acetate was found to be the preferred substrate; this organic acid was rapidly metabolized, and the specific rate of phenol consumption was considerably decreased, although phenol consumption was not abolished. This decrease corresponded to a drop in phenol hydroxylase and catechol-2,3-dioxygenase specific activities, and the synthesis of the latter was repressed at the transcriptional level. Studies with a mutant not able to consume acetate indicated that the organic acid itself triggers the repression. Other organic acids were also found to repress phenol degradation. One of these, benzoate, was found to completely block the catabolism of phenol (diauxic growth). A mutant unable to metabolize benzoate was also unable to develop on benzoate-phenol mixtures, indicating that the organic acid rather than a metabolite involved in benzoate degradation was responsible for the repression observed.

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Citations

Apr 5, 2000·Canadian Journal of Microbiology·J SchneiderD Warshawsky
Dec 17, 2002·The Journal of General and Applied Microbiology·Vera L. Santos, Valter R. Linardi
Aug 19, 2007·Journal of Bacteriology·Annette Arndt, Bernhard J Eikmanns
Jun 26, 2002·Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes·Satish WaliaRasul Chaudhry
Aug 20, 2004·Journal of Bacteriology·María J López BarragánEduardo Díaz
Oct 7, 2004·Applied and Environmental Microbiology·Angela MatthewsVladimir Jiranek

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