Nitrite-Dependent Anaerobic Methane-Oxidising Bacteria: Unique Microorganisms with Special Properties

Microbial mediated nitrite-dependent anaerobic methane oxidation (N-DAMO), which couples the oxidation of methane to nitrite reduction, is a recently discovered process. The discovery of N-DAMO process makes great contributions to complete the biogeochemical cycles of carbon and nitrogen, and to develop novel economic biotechnology for simultaneous carbon and nitrogen removal. This process is catalysed by the unique bacterium “CandidatusMethylomirabilis oxyfera” (M. oxyfera), which belongs to the candidate phylum NC10, a phylum having no members in pure culture. In recent years, some microbiological properties of M. oxyfera have been unravelled. The most prominent examples are the discoveries of the special ultrastructure (star-like) of the cell shape and the unique chemical composition (10MeC16:1Δ7) of M. oxyfera that have not been found in other bacteria yet. More importantly, a new intra-aerobic pathway was discovered in M. oxyfera. It seems that M. oxyfera produces oxygen intracellularly by the conversion of two nitric oxide molecules to dinitrogen gas and oxygen, and the produced oxygen is then used for methane oxidation and normal respiration. The current paper is a systematic review in the microbiological properties of M. oxyfera, especially for its special properties.

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