Abstract
In hydrothermal ecosystems, the dissolution of sulfur dioxide in water results in the formation of sulfite, which can be used in microbial metabolism. A limited number of thermophiles have been isolated using sulfite as an electron acceptor. From a terrestrial thermal spring, Sakhalin Island, Russia, we isolated a thermophilic anaerobic bacterium (strain SLA38T). Cells of strain SLA38T were spore-forming straight rods. Growth was observed at temperatures 45–65 °C (optimum at 60 °C) and pH 5.5–9.0 (optimum at pH 6.5–7.0). The novel isolate was capable of anaerobic respiration with sulfite, thiosulfate, fumarate and perchlorate or fermentative growth. Strain SLA38T utilized glycerol, lactate, pyruvate and yeast extract. It grew lithoautotrophically on carbon monoxide with thiosulfate as electron acceptor, producing acetate. The genome size of the isolate was 2.9 Mbp and genomic DNA G + C content was 53.6 mol%. Analysis of the 16S rRNA gene sequences revealed that strain SLA38T belongs to the genus Moorella. Based on the physiological features and phylogenetic analysis, we propose to assign strain SLA38T to a new species of the genus Moorella, as Moorella sulfitireducens sp. nov. The type strain is SLA38T (= DSM 111068T = VKM B-3584T).
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Funding
The work of G.B.S. was supported by the Russian Foundation for Basic Research, Grant No. 20-54-12031. The work of A.Y.M and A.I.S was supported by the Ministry of Science and Higher Education of the Russian Federation. The work of A.A.K. was supported by the Grant MK-5506.2021.4.
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Slobodkina, G.B., Merkel, A.Y., Kuchierskaya, A.A. et al. Moorella sulfitireducens sp. nov., a thermophilic anaerobic bacterium isolated from a terrestrial thermal spring. Extremophiles 26, 33 (2022). https://doi.org/10.1007/s00792-022-01285-w
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DOI: https://doi.org/10.1007/s00792-022-01285-w