scholarly journals Desulfothermobacter acidiphilus gen. nov., sp. nov., a thermoacidophilic sulfate-reducing bacterium isolated from a terrestrial hot spring

2018 ◽  
Vol 68 (3) ◽  
pp. 871-875 ◽  
Author(s):  
E. N. Frolov ◽  
K. S. Zayulina ◽  
D. S. Kopitsyn ◽  
I. V. Kublanov ◽  
E. A. Bonch-Osmolovskaya ◽  
...  
2011 ◽  
Vol 61 (4) ◽  
pp. 732-736 ◽  
Author(s):  
Sandra Baena ◽  
Natalia Perdomo ◽  
Catalina Carvajal ◽  
Carolina Díaz ◽  
Bharat K. C. Patel

A thermophilic, sulfate-reducing bacterium, designated strain USBA-053T, was isolated from a terrestrial hot spring located at a height of 2500 m in the Colombian Andes (5° 45′ 33.29″ N 73° 6′ 49.89″ W), Colombia. Cells of strain USBA-053T were oval- to rod-shaped, Gram-negative and motile by means of a single polar flagellum. The strain grew autotrophically with H2 as the electron donor and heterotrophically on formate, propionate, butyrate, valerate, isovalerate, lactate, pyruvate, ethanol, glycerol, serine and hexadecanoic acid in the presence of sulfate as the terminal electron acceptor. The main end products from lactate degradation, in the presence of sulfate, were acetate, CO2 and H2S. Strain USBA-053T fermented pyruvate in the absence of sulfate and grew optimally at 57 °C (growth temperature ranged from 50 °C to 62 °C) and pH 6.8 (growth pH ranged from 5.7 to 7.7). The novel strain was slightly halophilic and grew in NaCl concentrations ranging from 5 to 30 g l−1, with an optimum at 25 g l−1 NaCl. Sulfate, thiosulfate and sulfite were used as electron acceptors, but not elemental sulfur, nitrate or nitrite. The G+C content of the genomic DNA was 56±1 mol%. 16S rRNA gene sequence analysis indicated that strain USBA-053T was a member of the class Deltaproteobacteria, with Desulfacinum hydrothermale MT-96T as the closest relative (93 % gene sequence similarity). On the basis of physiological characteristics and phylogenetic analysis, it is suggested that strain USBA-053T represents a new genus and novel species for which the name Desulfosoma caldarium gen. nov., sp. nov. is proposed. The type strain of the type species is USBA-053T ( = KCTC 5670T = DSM 22027T).


2010 ◽  
Vol 76 (16) ◽  
pp. 5652-5657 ◽  
Author(s):  
Andrey V. Mardanov ◽  
Vitali A. Svetlitchnyi ◽  
Alexey V. Beletsky ◽  
Maria I. Prokofeva ◽  
Elizaveta A. Bonch-Osmolovskaya ◽  
...  

ABSTRACT Acidilobus saccharovorans is an anaerobic, organotrophic, thermoacidophilic crenarchaeon isolated from a terrestrial hot spring. We report the complete genome sequence of A. saccharovorans, which has permitted the prediction of genes for Embden-Meyerhof and Entner-Doudoroff pathways and genes associated with the oxidative tricarboxylic acid cycle. The electron transfer chain is branched with two sites of proton translocation and is linked to the reduction of elemental sulfur and thiosulfate. The genomic data suggest an important role of the order Acidilobales in thermoacidophilic ecosystems whereby its members can perform a complete oxidation of organic substrates, closing the anaerobic carbon cycle.


2013 ◽  
Vol 63 (Pt_2) ◽  
pp. 479-483 ◽  
Author(s):  
Anna A. Perevalova ◽  
Ilya V. Kublanov ◽  
R. V. Baslerov ◽  
Gengxin Zhang ◽  
Elizaveta A. Bonch-Osmolovskaya

A novel thermophilic bacterium, strain Kam1851T, was isolated from a terrestrial hot spring of the Uzon Caldera, Kamchatka Peninsula, Russia. Cells of strain Kam1851T were spore-forming rods with a Gram-positive type of cell wall. Growth was observed between 46 and 78 °C, and pH 5.5–8.5. The optimal growth (doubling time, 6.0 h) was at 60–65 °C and pH 6.5. The isolate was an obligate anaerobe growing in pre-reduced medium only. It grew on mineral medium with molecular hydrogen or formate as electron donors, and elemental sulfur, thiosulfate or polysulfide as electron acceptors. The main cellular fatty acids were C16 : 0 (34.2 %), iso-C16 : 0 (18 %), C18 : 0 (12.8 %) and iso-C17 : 0 (11.1 %). The G+C content of the genomic DNA of strain Kam1851T was 63 mol%. 16S rRNA gene sequence analysis showed that strain Kam1851T belonged to the order Thermoanaerobacterales , but it was not closely related to representatives of any genera with validly published names. The most closely related strains, which had no more than 89.2 % sequence similarity, were members of the genera Ammonifex and Caldanaerobacter . On the basis of its phylogenetic position and novel phenotypic features, isolate Kam1851T is proposed to represent a novel species in a new genus, Brockia lithotrophica gen. nov., sp. nov.; the type strain of Brockia lithotrophica is Kam1851T ( = DSM 22653T = VKM B-2685T).


2015 ◽  
Vol 9 (10) ◽  
pp. 2290-2303 ◽  
Author(s):  
María Estrella Alcamán ◽  
Camila Fernandez ◽  
Antonio Delgado ◽  
Birgitta Bergman ◽  
Beatriz Díez

2007 ◽  
Vol 73 (16) ◽  
pp. 5218-5226 ◽  
Author(s):  
Jesse G. Dillon ◽  
Susan Fishbain ◽  
Scott R. Miller ◽  
Brad M. Bebout ◽  
Kirsten S. Habicht ◽  
...  

ABSTRACT The importance of sulfate respiration in the microbial mat found in the low-sulfate thermal outflow of Mushroom Spring in Yellowstone National Park was evaluated using a combination of molecular, microelectrode, and radiotracer studies. Despite very low sulfate concentrations, this mat community was shown to sustain a highly active sulfur cycle. The highest rates of sulfate respiration were measured close to the surface of the mat late in the day when photosynthetic oxygen production ceased and were associated with a Thermodesulfovibrio-like population. Reduced activity at greater depths was correlated with novel populations of sulfate-reducing microorganisms, unrelated to characterized species, and most likely due to both sulfate and carbon limitation.


Microbiology ◽  
2016 ◽  
Vol 85 (3) ◽  
pp. 342-349 ◽  
Author(s):  
A. Y. Merkel ◽  
O. A. Podosokorskaya ◽  
T. G. Sokolova ◽  
E. A. Bonch-Osmolovskaya

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