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Applied and Environmental Microbiology, October 2005, p. 6423-6426, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.6423-6426.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Reduction of Uranium(VI) Phosphate during Growth of the Thermophilic Bacterium Thermoterrabacterium ferrireducens

T. V. Khijniak,1 A. I. Slobodkin,1 V. Coker,2 J. C. Renshaw,2 F. R. Livens,2 E. A. Bonch-Osmolovskaya,1 N.-K. Birkeland,3 N. N. Medvedeva-Lyalikova,1 and J. R. Lloyd2*

Winogradsky Institute of Microbiology, Russian Academy of Sciences, 7/2 Prospect 60-letiya Oktyabrya, Moscow 117312, Russia,1 The Williamson Research Centre for Molecular Environmental Science and The School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, United Kingdom,2 Department of Biology, University of Bergen, P.O. Box 7800, N-5020 Bergen, Norway3

Received 14 March 2005/ Accepted 30 April 2005

The thermophilic, gram-positive bacterium Thermoterrabacterium ferrireducens coupled organotrophic growth to the reduction of sparingly soluble U(VI) phosphate. X-ray powder diffraction and X-ray absorption spectroscopy analysis identified the electron acceptor in a defined medium as U(VI) phosphate [uramphite; (NH4)(UO2)(PO4) · 3H2O], while the U(IV)-containing precipitate formed during bacterial growth was identified as ningyoite [CaU(PO4)2 · H2O]. This is the first report of microbial reduction of a largely insoluble U(VI) compound.

* Corresponding author. Mailing address: The Williamson Research Centre for Molecular Environmental Science and The School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, Manchester M13 9PL, United Kingdom. Phone: 44 161 275 7155. Fax: 44 161 275 3947. E-mail: jon.lloyd{at}manchester.ac.uk.

Applied and Environmental Microbiology, October 2005, p. 6423-6426, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.6423-6426.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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