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Microbial degradation of aromatic compounds — from one strategy to four
TLDR
These strategies are based on different ring activation mechanisms that consist of either formation of a non-aromatic ring-epoxide under oxic conditions, or reduction of the aromatic ring under anoxic conditions using one of two completely different systems.
Anaerobic oxidation of aromatic compounds and hydrocarbons.
TLDR
New bacterial enzymes and reactions involved in oxidation of aromatic and hydrocarbon compounds to CO(2) in the complete absence of molecular oxygen have been discovered and of special interest are two reactions: the reduction of the aromatic ring of benzoyl-coenzyme A and the addition of fumarate to hydrocarbons.
Gene clusters involved in anaerobic benzoate degradation of Geobacter metallireducens
The degradation of aromatic compounds follows different biochemical principles in aerobic and anaerobic microorganisms. While aerobes dearomatize and cleave the aromatic ring by oxygenases,
6-Oxocyclohex-1-ene-1-carbonyl-coenzyme A hydrolases from obligately anaerobic bacteria: characterization and identification of its gene as a functional marker for aromatic compounds degrading
TLDR
The gene probe established in this work provides for the first time a general tool for the detection of a central functionality in aromatic compound-degrading anaerobes.
Benzoyl-coenzyme A reductase (dearomatizing), a key enzyme of anaerobic aromatic metabolism. ATP dependence of the reaction, purification and some properties of the enzyme from Thauera aromatica
  • M. Boll, G. Fuchs
  • Biology, Medicine
    European journal of biochemistry
  • 15 December 1995
TLDR
The central, aromatic-ring-reducing enzyme was investigated for the first time in the denitrifying bacterium Thauera aromatica strain K172 and exhibited oxygen-sensitive ATPase activity, reminiscent of those of nitrogenase which overcomes the high activation energy for dinitrogen reduction by coupling electron transfer to the hydrolysis of ATP.
The bzd Gene Cluster, Coding for Anaerobic Benzoate Catabolism, in Azoarcus sp. Strain CIB
TLDR
Benzoate-CoA ligase assays and transcriptional analyses based on lacZ-reporter fusions revealed that benzoate degradation in Azoarcus sp.
Genes coding for the benzoyl-CoA pathway of anaerobic aromatic metabolism in the bacterium Thauera aromatica.
TLDR
Benzoyl-CoA reductase subunits exhibit distinct similarities with 2-hydroxyglutaryl- coA dehydratase and its ATP-hydrolysing activase protein of Acidaminococcus fermentans as well as with open reading frames of unknown function in other bacteria.
Genes, Enzymes, and Regulation of para-Cresol Metabolism in Geobacter metallireducens
TLDR
In this work, in vitro enzyme activity measurements revealed that the obligately anaerobic Geobacter metallireducens uses the p-cresol degradation pathway of denitrifying bacteria, and it is proposed that the unusual asymmetric architecture and the membrane association of PCMH might be important for alternative electron transfer routes to either cytochrome c or menaquinone.
Anaerobic Degradation of Benzene and Polycyclic Aromatic Hydrocarbons
TLDR
The elucidation of the first anaerobic degradation pathways of naphthalene and methylnaphthalenes at the genetic and biochemical level now opens the door to studying the anaerilic metabolism and ecology of an aerobic PAH degraders, contributing to assessing the fate of one of the most important contaminant classes in anoxic sediments and aquifers.
Anaerobic Microbial Degradation of Hydrocarbons: From Enzymatic Reactions to the Environment
TLDR
Investigations funded by the Deutsche Forschungsgemeinschaft on the anaerobic microbial degradation of hydrocarbons ranged from isolation and enrichment of hitherto unknown hydrocarbon-degrading anaerobe microorganisms, discovery of novel reactions, detailed studies of enzyme mechanisms and structures to process-oriented in situ studies.
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