Abstract
Mono Lake sediment slurries incubated with lactate and tellurite [Te(IV)] turned progressively black with time because of the precipitation of elemental tellurium [Te(0)]. An enrichment culture was established from these slurries that demonstrated Te(IV)-dependent growth. The enrichment was purified by picking isolated black colonies from lactate/Te(IV) agar plates, followed by repeated streaking and picking. The isolate, strain MLTeJB, grew in aqueous Te(IV)-medium if provided with a small amount of sterile solid phase material (e.g., agar plug; glass beads). Strain MLTeJB grew at high concentrations of Te(IV) (~8 mM) by oxidizing lactate to acetate plus formate, while reducing Te(IV) to Te(0). Other electron acceptors that were found to sustain growth were tellurate, selenate, selenite, arsenate, nitrate, nitrite, fumarate and oxygen. Notably, growth on arsenate, nitrate, nitrite and fumarate did not result in the accumulation of formate, implying that in these cases lactate was oxidized to acetate plus CO2. Strain MLTeJB is a low G + C Gram positive motile rod with pH, sodium, and temperature growth optima at 8.5–9.0, 0.5–1.5 M, and 40°C, respectively. The epithet Bacillus beveridgei strain MLTeJBT is proposed.
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Acknowledgments
R. Bansal for 16S rRNA gene cloning and sequencing and J. Patterson for transmission electron microscopy. We are grateful to J. T. Hollibaugh for providing his dataset of other dissolved constituents of this ecosystem and thank S. E. Hoeft for advice in the choice of buffers for the pH experiments and L. G. Miller for technical assistance. This work was funded in part by the USGS and by a grant from the NASA Exobiology Program.
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Appendix 1: Description of Bacillus beveridgei, sp. nov.
Appendix 1: Description of Bacillus beveridgei, sp. nov.
Bacillus beveridgei (bev.er.rig’.ei.N.L. gen.n. beveridgei of Beveridge, named in honor of the memory of Professor Terry J. Beveridge for his broad contributions and teaching in the realm of Geomicrobiology, with specific reference to his research on the formation of mineral phases by microorganisms). Cells are Gram positive, motile rods with a peritrichous flagellum (0.25 × 1.3–2.6 μm) and have a DNA G + C content of 46.8%. Colonies on agar are round, smooth, 4–28 mm in diameter and appear dark black when grown on Te-oxyanions due to precipitation of Te(0). Haloalkaliphilic, with growth optimal at pH 9.0 and 0.5–1.5 M sodium chloride. Meso-thermophilic with a temperature optimum at 40°C. Facultative anaerobe, able to grow in air and with 5% v/v headspace O2, but cells are not microaerophilic. Anaerobic growth demonstrated with Te(VI), Te(IV), Se(VI), Se(IV), As(V), nitrate, nitrite, trimethylamine oxide, and fumarate as electron acceptors. Growth on nitrate is via dissimilatory reduction to ammonia. Electron donors include lactate, pyruvate, glucose and galactose, starch and complex substances like yeast extract. Growth on glucose, starch and yeast extract does not require the presence of an electron acceptor and can be fermentative. The type strain, MLTeJBT (DSMZ = DSM 22320; ATCC = BAA-1786) was isolated from Mono Lake, an alkaline hypersaline soda lake in California, USA.
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Baesman, S.M., Stolz, J.F., Kulp, T.R. et al. Enrichment and isolation of Bacillus beveridgei sp. nov., a facultative anaerobic haloalkaliphile from Mono Lake, California, that respires oxyanions of tellurium, selenium, and arsenic. Extremophiles 13, 695–705 (2009). https://doi.org/10.1007/s00792-009-0257-z
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DOI: https://doi.org/10.1007/s00792-009-0257-z