Coenzyme A ligases involved in anaerobic biodegradation of aromatic compounds

Canadian Journal of Microbiology
R Villemur

Abstract

Bacterial strains and consortia of bacteria have been isolated for their ability to degrade, under anaerobic conditions, homocyclic monoaromatic compounds, such as phenolic compounds, methylbenzenes, and aminobenzenes. As opposed to aerobic conditions where these compounds are degraded via dihydroxyl intermediates introduced by oxygenases, most of aromatic compounds under anaerobic conditions are metabolized via aromatic acid intermediates, such as nitrobenzoates, hydroxybenzoates, or phenylacetate. These aromatic acids are then transformed to benzoate before the reduction and the cleavage of the benzene ring to aliphatic acid products. One step of these catabolic pathways is the addition of a coenzyme A (CoA) residue to the carboxylic group of the aromatic acids by CoA ligases. This addition would facilitate the enzymatic transformation of the aromatic acids to benzoyl-CoA and the subsequent degradation steps of this latter molecule. Aromatic acid-CoA ligases have been characterized or detected from several bacterial strains that were grown under anaerobic conditions and from an anaerobic syntrophic consortium. They are also involved in the degradation of some aromatic compounds under aerobic conditions. They have molecular ma...Continue Reading

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Jun 1, 2005·Research in Microbiology·Viviana IzzoAlberto Di Donato
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