Interesting anaerobes in the environment
Linda L Blackall
+ Author Affiliations
- Author Affiliations
School of Science
Faculty of Science, Engineering and Technology
Swinburne University of Technology
Email: lblackall@swin.edu.au
Microbiology Australia 36(3) 133-135 https://doi.org/10.1071/MA15046
Published: 20 August 2015
Abstract
Prokaryotes (Bacteria and Archaea) have a wide range of capacities to survive by generating energy in environments and situations lacking oxygen, which abound on Earth. Anaerobic metabolic strategies include anaerobic respiration (numerous types – e.g. nitrate reduction – Paracoccus denitrificans; sulfur respiration – Desulfuromonadales; methanogenesis – Methanosarsina spp.; iron reduction – Geobacter spp.; dehalorespiration – Dehalococcoides ethenogenes) and fermentation (sugars converted to simpler organic compounds like acids, gases and alcohols – e.g. Lactobacillus spp.). Relatively novel environmental anaerobic strategies include anaerobic ammonium oxidation (Anammox – e.g. Brocadia spp.) and anaerobic methane oxidation (AMO)1, which is a syntrophic association between anaerobic methanotrophic archaea (ANME) and sulfate-, iron-, manganese- or nitrate-reducing bacteria2. The classic anaerobic synthrophic example is interspecies hydrogen/formate transfer between a hydrogen/formate producing fatty acid oxidising bacterium (the syntroph) and a hydrogen/formate consumer (methanogen or sulfate-reducer)3. Microbes vary in their oxygen tolerance and are described as obligate anaerobes if they are killed by atmospheric levels of oxygen due to the lack of catalase and superoxide dismutase that provide oxygen radical protection.
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