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Chemolithotrophic Growth of the Aerobic Hyperthermophilic Bacterium Thermocrinis ruber OC 14/7/2 on Monothioarsenate and Arsenite

Title data

Härtig, Cornelia ; Lohmayer, Regina ; Kolb, Steffen ; Horn, Marcus A. ; Inskeep, William P. ; Planer-Friedrich, Britta:
Chemolithotrophic Growth of the Aerobic Hyperthermophilic Bacterium Thermocrinis ruber OC 14/7/2 on Monothioarsenate and Arsenite.
In: FEMS Microbiology Ecology. Vol. 90 (2015) Issue 3 . - pp. 747-760.
ISSN 1574-6941
DOI: https://doi.org/10.1111/1574-6941.12431

Abstract in another language

Novel insights are provided regarding aerobic chemolithotrophic growth of Thermocrinis ruber OC14/7/2 on the electron donors arsenite and monothioarsenate. T. ruber is a hyperthermophilic bacterium that thrives in pH-neutral to alkaline hot springs and grows on hydrogen, elemental sulfur, and thiosulfate. Our study showed that T. ruber can also utilize arsenite as sole electron donor producing arsenate. Growth rates of 0.024 h-1 were lower than for oxidation of thiosulfate to sulfate (μ=0.247 h-1). Fast growth was observed on monothioarsenate (μ=0.359 h-1), comprising different abiotic and biotic redox interactions. The initial dominant process was abiotic transformation of monothioarsenate to arsenate and elemental sulfur, followed by microbial oxidation of sulfur to sulfate. Elevated microbial activity during stationary growth of T. ruber might be explained by microbial oxidation of thiosulfate and arsenite, both also products of abiotic monothioarsenate transformation. However, the observed rapid decrease of monothioarsenate, exceeding concentrations in equilibrium with its products, also indicates direct microbial oxidation of arsenic-bond S(-II) to sulfate. Free sulfide was oxidized abiotically too fast to play a role as electron donor for T. ruber. Our present laboratory and previous field studies suggest that thioarsenates can either indirectly or directly be used by (hyper)thermophiles in arsenic-sulfidic environments.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER124788
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 03 May 2015 08:56
Last Modified: 03 May 2015 08:56
URI: https://eref.uni-bayreuth.de/id/eprint/12611