Title |
Identification of Mn(II)-Oxidizing Bacteria from a Low-pH Contaminated Former Uranium Mine
|
---|---|
Published in |
Applied and Environmental Microbiology, June 2014
|
DOI | 10.1128/aem.01296-14 |
Pubmed ID | |
Authors |
Denise M. Akob, Tsing Bohu, Andrea Beyer, Franziska Schäffner, Matthias Händel, Carol A. Johnson, Dirk Merten, Georg Büchel, Kai Uwe Totsche, Kirsten Küsel |
Abstract |
Biological Mn oxidation is responsible for producing highly reactive and abundant Mn oxide phases in the environment that can mitigate metal contamination. However, little is known about Mn oxidation at low pH environments, where metal contamination often is a problem due to mining activities. We isolated two Mn(II)-oxidizing bacteria (MOB) at pH 5.5 (Duganella isolate AB_14 and Albidiferax isolate TB-2) and nine strains at pH 7 from a former uranium mining site. Isolate TB-2 may contribute to Mn oxidation in the acidic Mn-rich subsoil as a closely related clone represented 16% of the total community. All isolates oxidized Mn over a small pH range and low pH isolates only oxidized Mn below pH 6. Two strains with different pH optima differed in their Fe requirements for Mn oxidation, suggesting that Mn oxidation by the neutral pH strain was linked to Fe oxidation. Isolates tolerated Ni, Cu, and Cd and produced Mn oxides with similarities to todorokite and birnessite, with the latter being present in subsurface layers where metal enrichment was associated with Mn oxides. This demonstrates that MOB can be involved in the formation of biogenic Mn oxides in both moderately acidic and neutral pH environments. |
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