title: Sulfobacillus thermotolerans sp. nov., a thermotolerant, chemolithotrophic bacterium.
abstract: A thermotolerant, Gram-positive, aerobic, endospore-forming, acidophilic bacterium (strain Kr1T) was isolated from the pulp of a gold-containing sulfide concentrate processed at 40 degrees C in a gold-recovery plant (Siberia). Cells of strain Kr1(T) were straight to slightly curved rods, 0.8-1.2 microm in diameter and 1.5-4.5 microm in length. Strain Kr1T formed spherical and oval, refractile, subterminally located endospores. The temperature range for growth was 20-60 degrees C, with an optimum at 40 degrees C. The pH range for growth on medium containing ferrous iron was 1.2-2.4, with an optimum at pH 2.0; the pH range for growth on medium containing S0 was 2.0-5.0, with an optimum at pH 2.5. Strain Kr1T was mixotrophic, oxidizing ferrous iron, S0, tetrathionate or sulfide minerals as energy sources in the presence of 0.02 % yeast extract or other organic substrates. The G+C content of the DNA of strain Kr1T was 48.2+/-0.5 mol%. Strain Kr1T showed a low level of DNA-DNA reassociation with the known Sulfobacillus species (11-44 %). 16S rRNA gene sequence analysis revealed that Kr1T formed a separate phylogenetic group with a high degree of similarity between the nucleotide sequences (98.3-99.6 %) and 100 % bootstrap support within the phylogenetic Sulfobacillus cluster. On the basis of its physiological properties and the results of phylogenetic analyses, strain Kr1T can be affiliated to a novel species of the genus Sulfobacillus, for which the name Sulfobacillus thermotolerans sp. nov. is proposed. The type strain is Kr1T (=VKM B-2339T=DSM 17362T).
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, Moscow, 117312 Russia.
authors.forename: Tat'yana I
authors.initials: TI
authors.lastname: Bogdanova
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, Moscow, 117312 Russia.
authors.forename: Iraida A
authors.initials: IA
authors.lastname: Tsaplina
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, Moscow, 117312 Russia.
authors.forename: Tamara F
authors.initials: TF
authors.lastname: Kondrat'eva
authors.affiliation: G. K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pr. Nauki 5, Pushchino, Moscow Region, 142290 Russia.
authors.forename: Vitalii I
authors.initials: VI
authors.lastname: Duda
authors.affiliation: G. K. Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, Pr. Nauki 5, Pushchino, Moscow Region, 142290 Russia.
authors.forename: Natalya E
authors.initials: NE
authors.lastname: Suzina
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, Moscow, 117312 Russia.
authors.forename: Vitalii S
authors.initials: VS
authors.lastname: Melamud
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, Moscow, 117312 Russia.
authors.forename: Tat'yana P
authors.initials: TP
authors.lastname: Tourova
authors.affiliation: Winogradsky Institute of Microbiology, Russian Academy of Sciences, Prospect 60-letiya Oktyabrya 7/2, Moscow, 117312 Russia.
authors.forename: Grigorii I
authors.initials: GI
authors.lastname: Karavaiko
mesh_terms: D001482:Base Composition; D050260:Carbohydrate Metabolism; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D004783:Environmental Microbiology; D005296:Ferrous Compounds / Q000378:metabolism; D020459:Genes, rRNA; D018698:Glutamic Acid / Q000378:metabolism; D005978:Glutathione / Q000378:metabolism; D006046:Gold; D016937:Gram-Positive Endospore-Forming Rods / Q000145:classification* / Q000166:cytology / Q000302:isolation & purification* / Q000502:physiology; D006863:Hydrogen-Ion Concentration; D008969:Molecular Sequence Data; D009693:Nucleic Acid Hybridization; D010084:Oxidation-Reduction; D010802:Phylogeny; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013440:Sulfides / Q000378:metabolism; D013455:Sulfur / Q000378:metabolism; D013696:Temperature; D013776:Tetrathionic Acid / Q000378:metabolism
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D005296:Ferrous Compounds; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S; D013440:Sulfides; D018698:Glutamic Acid; D013455:Sulfur; D006046:Gold; D013776:Tetrathionic Acid; D005978:Glutathione