title: Venenivibrio stagnispumantis gen. nov., sp. nov., a thermophilic hydrogen-oxidizing bacterium isolated from Champagne Pool, Waiotapu, New Zealand.
abstract: A novel thermophilic, hydrogen-oxidizing bacterium, designated strain CP.B2(T), was isolated from a terrestrial hot spring in Waiotapu, New Zealand. Cells were motile, slightly rod-shaped, non-spore-forming and Gram-negative. Isolate CP.B2(T) was an obligate chemolithotroph, growing by utilizing H(2) as electron donor and O(2) as corresponding electron acceptor. Elemental sulfur (S(0)) or thiosulfate ( ) was essential for growth. Microbial growth occurred under microaerophilic conditions in 1.0-10.0 % (v/v) O(2) [optimum 4-8 % (v/v) O(2)], between 45 and 75 degrees C (optimum 70 degrees C) and at pH values of 4.8-5.8 (optimum pH 5.4). The DNA G+C content was 29.3 mol%. 16S rRNA gene sequence analysis demonstrated that strain CP.B2(T) belonged to the order Aquificales, with a close phylogenetic relationship to Sulfurihydrogenibium azorense (94 % sequence similarity to the type strain). However, genotypic and metabolic characteristics differentiated the novel isolate from previously described genera of the Aquificales. Therefore, CP.B2(T) represents a novel species in a new genus, for which the name Venenivibrio stagnispumantis gen. nov., sp. nov. is proposed. The type strain of Venenivibrio stagnispumantis is CP.B2(T) (=JCM 14244(T) =DSM 18763(T)).
authors.affiliation: Thermophile Research Unit, University of Waikato, Te Whare Wananga o Waikato, Private Bag 3105, Hamilton 3240, New Zealand. hetzere.adrian@web.de
authors.forename: Adrian
authors.initials: A
authors.lastname: Hetzer
authors.forename: Ian R
authors.initials: IR
authors.lastname: McDonald
authors.forename: Hugh W
authors.initials: HW
authors.lastname: Morgan
mesh_terms: D015373:Bacterial Typing Techniques; D001482:Base Composition; D004269:DNA, Bacterial / Q000032:analysis; D020459:Genes, rRNA; D006091:Gram-Negative Chemolithotrophic Bacteria / Q000145:classification* / Q000235:genetics / Q000254:growth & development / Q000302:isolation & purification*; D045482:Hot Springs / Q000382:microbiology*; D006358:Hot Temperature; D006859:Hydrogen / Q000378:metabolism*; D008969:Molecular Sequence Data; D009520:New Zealand; D010084:Oxidation-Reduction; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013045:Species Specificity
chemical_list: D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; D006859:Hydrogen