BioMetals

, Volume 22, Issue 1, pp 131–139

Reduction of molybdate by sulfate-reducing bacteria

Authors

  • Keka C. Biswas
    • Department of ScienceWesley College
  • Nicole A. Woodards
    • Department of Biology, Laboratory of Microbial ChemistryUniversity of New Mexico
  • Huifang Xu
    • Department of Geology and GeophysicsUniversity of Wisconsin
    • Department of Biology, Laboratory of Microbial ChemistryUniversity of New Mexico
Article

DOI: 10.1007/s10534-008-9198-8

Cite this article as:
Biswas, K.C., Woodards, N.A., Xu, H. et al. Biometals (2009) 22: 131. doi:10.1007/s10534-008-9198-8

Abstract

Molybdate is an essential trace element required by biological systems including the anaerobic sulfate-reducing bacteria (SRB); however, detrimental consequences may occur if molybdate is present in high concentrations in the environment. While molybdate is a structural analog of sulfate and inhibits sulfate respiration of SRB, little information is available concerning the effect of molybdate on pure cultures. We followed the growth of Desulfovibrio gigas ATCC 19364, Desulfovibrio vulgaris Hildenborough, Desulfovibrio desulfuricans DSM 642, and D. desulfuricans DSM 27774 in media containing sub-lethal levels of molybdate and observed a red-brown color in the culture fluid. Spectral analysis of the culture fluid revealed absorption peaks at 467, 395 and 314 nm and this color is proposed to be a molybdate–sulfide complex. Reduction of molybdate with the formation of molybdate disulfide occurs in the periplasm D. gigas and D. desulfuricans DSM 642. From these results we suggest that the occurrence of poorly crystalline Mo-sulfides in black shale may be a result from SRB reduction and selective enrichment of Mo in paleo-seawater.

Keywords

MolybdateMolybdenum disulfideTransition metalsDissimilatory metal reductionSulfate-reducing bacteria

Copyright information

© Springer Science+Business Media, LLC. 2008