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

Titelangaben

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. Bd. 90 (2015) Heft 3 . - S. 747-760.
ISSN 1574-6941
DOI: https://doi.org/10.1111/1574-6941.12431

Abstract

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.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER124788
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie > Lehrstuhl Ökologische Mikrobiologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Professur Umweltgeochemie > Professur Umweltgeochemie - Univ.-Prof. Dr. Britta Planer-Friedrich
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Biologie
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 03 Mai 2015 08:56
Letzte Änderung: 03 Mai 2015 08:56
URI: https://eref.uni-bayreuth.de/id/eprint/12611