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Archives of Microbiology

, Volume 155, Issue 1, pp 68–74 | Cite as

Anaerobic metabolism of resorcyclic acids (m-dihydroxybenzoic acids) and resorcinol (1,3-benzenediol) in a fermenting and in a denitrifying bacterium

  • Claudia Kluge
  • Andreas Tschech
  • Georg Fuchs
Original Papers

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.

Key words

Aromatic compounds Resorcinol Resorcyclic acids 1,3-Benzenediol 1,3-Cyclohexanedione Resorcinol reductase 2,4-Dihydroxybenzoic acid decarboxylase 2,6-Dihydroxybenzoic acid decarboxylase 1,3-Cyclohexanedione hydrolase 5-Oxocaproic acid Clostridium Denitrifying Anaerobic aromatic metabolism 

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Copyright information

© Springer-Verlag 1990

Authors and Affiliations

  • Claudia Kluge
    • 1
  • Andreas Tschech
    • 1
  • Georg Fuchs
    • 1
  1. 1.Abteilung Angewandte MikrobiologieUniversität UlmUlmFederal Republic of Germany

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