Abstract
The anaerobic metabolism of 2,4- and 2,6-dihydroxybenzoic acid (beta- and gamma-resorcyclic acid) and 1,3-benzenediol (resorcinol) was investigated in a fermenting coculture of a Clostridium sp. with a Campylobacter sp. (Tschech A and Schink B (1985) Arch Microbiol 143: 52–59) and in a newly isolated denitrifying gram-negative bacterium. The enzymes of this pathway were searched for and partly characterized in vitro. It is shown that resorcyclic acids are decarboxylated in both organisms by specific enzymes, 2,4- or 2,6-dihydroxybenzoic acid decarboxylase. In the fermenting bacterium, the aromatic product, 1,3-benzenediol, is reduced by 1,3-benzenediol (resorcinol) reductase to the non-aromatic 1,3-cyclohexanedione; the novel enzyme which catalyzes the two-electron-reduction of the aromatic nucleus is oxygen-sensitive and uses reduced methyl viologen as artificial electron donor. The cyclic dione is then hydrolytically cleaved to 5-oxocaproic acid by 1,3-cyclohexanedione hydrolase. The denitrifying bacterium did not metabolize 1,3-cyclohexanedione, and the enzymes metabolizing 1,3-benzenediol or 1,3-cyclohexanedione were not detected. It is concluded that two different pathways of anaerobic 1,3-benzenediol metabolism exist.
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Kluge, C., Tschech, A. & Fuchs, G. Anaerobic metabolism of resorcyclic acids (m-dihydroxybenzoic acids) and resorcinol (1,3-benzenediol) in a fermenting and in a denitrifying bacterium. Arch. Microbiol. 155, 68–74 (1990). https://doi.org/10.1007/BF00291277
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DOI: https://doi.org/10.1007/BF00291277