The competitive success of Methanomicrococcus blatticola, a dominant methylotrophic methanogen in the cockroach hindgut, is supported by high substrate affinities and favorable thermodynamics
| Autor: | Jan T. Keltjens, Johannes H. P. Hackstein, Wander W. Sprenger |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
animal structures
Ecology biology ved/biology ved/biology.organism_classification_rank.species chemistry.chemical_element Hindgut Metabolism biology.organism_classification Applied Microbiology and Biotechnology Microbiology Oxygen Methanogen chemistry Biochemistry Methanosarcina barkeri Methanomicrobiales Energy source Methanosarcinaceae |
| Zdroj: | FEMS Microbiology Ecology. 60:266-275 |
| ISSN: | 1574-6941 0168-6496 |
| DOI: | 10.1111/j.1574-6941.2007.00287.x |
| Popis: | Methanomicrococcus blatticola is an obligately anaerobic methanogen that derives the energy for growth exclusively from the reduction of methylated compounds to methane with molecular hydrogen as energy source. Competition for methanol (concentration below 10 microM) and H(2) (concentration below 500 Pa), as well as oxidative stress due to the presence of oxygen are likely to occur in the peripheral region of the cockroach hindgut, the species' normal habitat. We investigated the ecophysiological properties of M. blatticola to explain how it can successfully compete for its methanogenic substrates. The organism showed affinities for methanol (K(m)=5 microM; threshold 0.2 h(-1)) and specific growth yields (up to 7 g of dry cells per mole of methane formed) that are particularly high within the realm of mesophilic methanogens. Upon oxygen exposure, part of the metabolic activity may be diverted into oxygen removal, thus establishing appropriate anaerobic conditions for survival and growth. |
| Databáze: | OpenAIRE |
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