Biotransformation of Scheelite CaWO4 by the Extreme Thermoacidophile Metallosphaera sedula

Autor(en)
Amir Blazevic, Mihaela Albu, Stefan Mitsche, Simon K-M R. Rittmann, Gerlinde Habler, Tetyana Milojevic
Abstrakt

The tungsten-microbial interactions and microbial bioprocessing of tungsten ores, which are still underexplored, are the focus of the current study. Here we show that the biotransformation of tungsten mineral scheelite performed by the extreme thermoacidophile Metallosphaera sedula leads to the breakage of scheelite structure and subsequent tungsten solubilization. Total soluble tungsten is significantly higher in cultures containing M. sedula grown on scheelite than the abiotic control, indicating active bioleaching. Advanced analytical electron microscopy was used in order to achieve nanoscale resolution ultrastructural studies of M. sedula grown on tungsten bearing scheelite. In particular, we describe that M. sedula mediated the biotransformation of scheelite, which was accompanied by the release of tungsten into solution and tungsten biomineralization of the cell surface. Furthermore, we observed intracellular incorporation of redox heterogenous Mn- and Fe-containing nano-clusters. Our results highlight unique metallophilic life in hostile environments extending the knowledge of tungsten biogeochemistry. Based on these findings biohydrometallurgical processing of tungsten ores can be further explored. Importantly, biogenic tungsten carbide-like nanolayers described herein are potential targets for developing nanomaterial biotechnology.

Organisation(en)
Institut für Biophysikalische Chemie, Department für Ökogenomik und Systembiologie, Department für Lithosphärenforschung
Externe Organisation(en)
Graz Ctr Electron Microscopy
Journal
Frontiers in Microbiology
Band
10
Anzahl der Seiten
11
ISSN
1664-302X
DOI
https://doi.org/10.3389/fmicb.2019.01492
Publikationsdatum
07-2019
Peer-reviewed
Ja
ÖFOS 2012
Mikrobiologie
Schlagwörter
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/biotransformation-of-scheelite-cawo4-by-the-extreme-thermoacidophile-metallosphaera-sedula(426f7e69-6802-4b44-8671-25025dc24bc7).html