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Anaerobic Chemolithotrophic Growth of the Haloalkaliphilic Bacterium Strain MLMS‑1 by Disproportionation of Monothioarsenate

Titelangaben

Planer-Friedrich, Britta ; Härtig, Cornelia ; Lohmayer, Regina ; Süß, Elke ; McCann, Shelley H. ; Oremland, Ron:
Anaerobic Chemolithotrophic Growth of the Haloalkaliphilic Bacterium Strain MLMS‑1 by Disproportionation of Monothioarsenate.
In: Environmental Science & Technology. Bd. 49 (2015) Heft 11 . - S. 6554-6563.
ISSN 0013-936X
DOI: https://doi.org/10.1021/acs.est.5b01165

Abstract

A novel chemolithotrophic metabolism based on a mixed arsenic-sulfur species has been discovered for the anaerobic deltaproteobacterium, strain MLMS-1, a haloalkaliphile isolated from Mono Lake, California, USA. Strain MLMS-1 is the first reported obligate arsenate-respiring chemoautotroph which grows by coupling arsenate reduction to arsenite with the oxidation of sulfide to sulfate. In that pathway the formation of a mixed arsenic-sulfur species was reported. That species was assumed to be monothioarsenite ([H2AsIIIS-IIO2]-), formed as an intermediate by abiotic reaction of arsenite with sulfide. We now report that this species is monothioarsenate ([HAsVS-IIO3]2-) as revealed by X-ray absorption spectroscopy. Monothioarsenate forms by abiotic reaction of arsenite with zero-valent sulfur. Monothioarsenate is kinetically stable under a wide range of pH and redox conditions. However, it was metabolized rapidly by strain MLMS-1 when incubated with arsenate. Incubations using monothioarsenate confirmed that strain MLMS-1 was able to grow (µ = 0.017 h-1) on this substrate via a disproportionation reaction by oxidizing the thio-group-sulfur (S-II) to zero-valent sulfur or sulfate while concurrently reducing the central arsenic atom (AsV) to arsenite. Monothioarsenate disproportionation could be widespread in nature beyond the already studied arsenic and sulfide rich hot springs and soda lakes where it was discovered.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER129021
Institutionen der Universität: 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
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
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 Aug 2016 06:08
Letzte Änderung: 03 Aug 2016 07:26
URI: https://eref.uni-bayreuth.de/id/eprint/33790