A novel nitrite-oxidizing bacterium (NOB), strain Lb(T), was isolated from a nitrifying bioreactor with a high loading of ammonium bicarbonate in a mineral medium with nitrite as the energy source. The cells were oval (lancet-shaped) rods with pointed edges, non-motile, Gram-positive (by staining and from the cell wall structure) and non-spore-forming. Strain Lb(T) was an obligately aerobic, chemolitoautotrophic NOB, utilizing nitrite or formate as the energy source and CO2 as the carbon source. Ammonium served as the only source of assimilated nitrogen. Growth with nitrite was optimal at pH 6.8-7.5 and at 40 °C (maximum 46 °C). The membrane lipids consisted of C20 alkyl 1,2-diols with the dominant fatty acids being 10MeC18 and C(18 : 1)ω9. The peptidoglycan lacked meso-DAP but contained ornithine and lysine. The dominant lipoquinone was MK-8. Phylogenetic analyses of the 16s rRNA gene sequence placed strain Lb(T) into the class Thermomicrobia of the phylum Chloroflexi with Sphaerobacter thermophilus as the closest relative. On the basis of physiological and phylogenetic data, it is proposed that strain Lb(T) represents a novel species of a new genus, with the suggested name Nitrolancea hollandica gen. nov., sp. nov. The type strain of the type species is Lb(T) ( = DSM 23161(T) = UNIQEM U798(T)).

Department of Aquatic Microbiology Institute for Biodiversity and Ecosystem Dynamics University of Amsterdam Amsterdam The Netherlands

Department of Biotechnology TU Delft The Netherlands

Department of Marine Organic Biogeochemistry NIOZ Royal Netherlands Institute for Sea Research Den Burg The Netherlands

Department of Microbial Ecology Ecology Centre University of Vienna Vienna Austria

Department of Water Technology ICT Prague Czech Republic

Microbiology Department Faculty of Biology Lomonosov Moscow State University Moscow Russia

Winogradsky Institute of Microbiology RAS Moscow Russia

Citace poskytuje Crossref.org

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