title: Physiological and phylogenetic characterization of a novel lithoautotrophic nitrite-oxidizing bacterium, 'Candidatus Nitrospira bockiana'.
abstract: A new isolate of a lithoautotrophic nitrite-oxidizing bacterium was obtained from internal corrosion deposits from a steel pipeline of the Moscow heating system. The organism oxidized nitrite as the sole energy source and fixed carbon dioxide as the only carbon source. The cells were extremely pleomorphic: loosely wound spirals, slightly curved and even straight rods were detected, as well as coccoid cells. The highest rate of nitrite consumption (1.5 mM nitrite as substrate) was measured at 42 degrees C, with a temperature range of 28-44 degrees C. In enrichment cultures with Nocardioides sp. as an accompanying organism, optimal oxidation of 5.8 mM nitrite occurred at 45 degrees C, with a range of 28-48 degrees C. Neither pyruvate nor yeast extract stimulated nitrification. Organotrophic growth was not observed. Phylogenetic analysis of 16S rRNA gene sequences revealed that the novel isolate represents a new sublineage of the genus Nitrospira. On the basis of physiological, chemotaxonomic and molecular characteristics, the name 'Candidatus Nitrospira bockiana' is proposed.
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-let Oktyabrya 7/2, Moscow 117312, Russia.
authors.forename: E V
authors.initials: EV
authors.lastname: Lebedeva
authors.forename: M
authors.initials: M
authors.lastname: Alawi
authors.forename: F
authors.initials: F
authors.lastname: Maixner
authors.forename: P-G
authors.initials: PG
authors.lastname: Jozsa
authors.forename: H
authors.initials: H
authors.lastname: Daims
authors.forename: E
authors.initials: E
authors.lastname: Spieck
mesh_terms: D015373:Bacterial Typing Techniques; D003343:Corrosion; D003470:Culture Media; D004269:DNA, Bacterial / Q000032:analysis; D020459:Genes, rRNA; D006091:Gram-Negative Chemolithotrophic Bacteria / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification / Q000502:physiology*; D008969:Molecular Sequence Data; D009031:Moscow; D009573:Nitrites / Q000378:metabolism*; D010084:Oxidation-Reduction; D010641:Phenotype; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013045:Species Specificity; D013232:Steel
chemical_list: D003470:Culture Media; D004269:DNA, Bacterial; D009573:Nitrites; D012336:RNA, Ribosomal, 16S; D013232:Steel