title: Thermovorax subterraneus, gen. nov., sp. nov., a thermophilic hydrogen-producing bacterium isolated from geothermally active underground mine.
abstract: A thermophilic, rod-shaped, motile, Gram-positive, spore-forming bacterium strain 70B(T) was isolated from a geothermally active underground mine in Japan. The temperature and pH range for growth was 50-81 degrees C (optimum 71 degrees C) and 6.2-9.8 (optimum pH 7-7.5), respectively. Growth occurred in the presence 0-2% NaCl (optimum 1% NaCl). Strain 70B(T) could utilize glucose, fructose, mannose, mannitol, pyruvate, cellobiose and tryptone as substrates. Thiosulfate was used as electron acceptor. Major whole-cell fatty acids were iso-C(15:0), C(16:0) DMA (dimethyl acetal), C(16:0) and anteiso-C(15:0). The G+C mol% of the DNA was 44.2%. Phylogenetic analysis based on the 16S rRNA gene sequence revealed that the closest relatives of strain 70B(T) were Thermosediminibacter oceani DSM 16646(T) (94% similarity) and Thermosediminibacter litoriperuensis DSM 16647 (93% similarity). The phenotypic, chemotaxonomic and phylogenetic properties suggest that strain 70B(T) represents a novel species in a new genus, for which the name Thermovorax subterraneus gen. nov., sp. nov. is proposed. The type strain of Thermovorax subterraneus is 70B(T) (=DSM 21563 = JCM 15541).
authors.affiliation: Department of Chemistry and Bioengineering, Tampere University of Technology, P.O. Box 541, 33101, Tampere, Finland. annukka.makinen@tut.fi
authors.forename: Annukka E
authors.initials: AE
authors.lastname: Mäkinen
authors.forename: Anna H
authors.initials: AH
authors.lastname: Kaksonen
authors.forename: Jaakko A
authors.initials: JA
authors.lastname: Puhakka
mesh_terms: D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism; D001483:Base Sequence; D017931:DNA Primers; D005798:Genes, Bacterial; D006859:Hydrogen / Q000378:metabolism*; D008906:Mining; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013056:Spectrophotometry, Ultraviolet
chemical_list: D017931:DNA Primers; D012336:RNA, Ribosomal, 16S; D006859:Hydrogen