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Anaerobic reduction of europium by a Clostridium strain as a strategy for rare earth biorecovery

Article scientifique 2019 Anglais

Résumé

Abstract The biorecovery of europium (Eu) from primary (mineral deposits) and secondary (mining wastes) resources is of interest due to its remarkable luminescence properties, important for modern technological applications. In this study, we explored the tolerance levels, reduction and intracellular bioaccumulation of Eu by a site-specific bacterium,Clostridiumsp. 2611 isolated from Phalaborwa carbonatite complex.Clostridiumsp. 2611 was able to grow in minimal medium containing 0.5 mM Eu3+. SEM-EDX analysis confirmed an association between Eu precipitates and the bacterium, while TEM-EDX analysis indicated intracellular accumulation of Eu. According to the HR-XPS analysis, the bacterium was able to reduce Eu3+to Eu2+under growth and non-growth conditions. Preliminary protein characterization seems to indicate that a cytoplasmic pyruvate oxidoreductase is responsible for Eu bioreduction. These findings suggest the bioreduction of Eu3+byClostridiumsp. as a resistance mechanism, can be exploited for the biorecovery of this metal.

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Maleke, M., Valverde, Á., Gómez-Árias, A., Cason, E., Vermeulen, J., Coetsee-Hugo, L., Swart, H., Heerden, E., Castillo, J. (2019). Anaerobic reduction of europium by a Clostridium strain as a strategy for rare earth biorecovery. https://doi.org/10.1038/s41598-019-50179-z

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Auteur(s)

Maleke Maleke Ángel Valverde Alba Gómez-Árias Errol D. Cason Jan‐G Vermeulen Liza Coetsee-Hugo H.C. Swart Esta van Heerden Julio Castillo

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