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Enterobacter cloacae SLD1a-1 gains a selective advantage from selenate reduction when growing in nitrate-depleted anaerobic environments

Lookup NU author(s): James Leaver

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Abstract

Enterobacter cloacae SLD1a-1 is capable of the complete reduction of selenate to selenium and the initial reaction is catalysed by a membrane-bound selenate reductase. In the present study, continuous culture experiments were employed to investigate the possibility that selenate reduction, via the selenate reductase, might provide sufficient energy to maintain cell viability when deprived of the preferred anaerobic terminal electron acceptor nitrate. The evidence presented indicates that the selenate reductase supports slow growth that retards the wash-out of the culture when switching to nitrate-depleted selenate-rich medium, and provides a proton motive force for sustained cell maintenance. In contrast, a strain of E. cloacae (sub sp. cloacae) that does not readily reduce selenate, cannot sustain cell maintenance when switching to a selenate-rich medium. This work demonstrates for the first time that respiratory linked selenate reduction gives E. cloacae SLD1a-1 a selective advantage when inhabiting selenate-contaminated environments and highlights the suitability of utilising E. cloacae SLD1a-1 when developing selenium remediation strategies. © 2008 Society for Industrial Microbiology.

Publication metadata

Author(s): Leaver JT, Richardson DJ, Butler CS

Publication type: Article

Publication status: Published

Journal: Journal of Industrial Microbiology and Biotechnology

Year: 2008

Volume: 35

Issue: 8

Pages: 867-873

ISSN (print): 1367-5435

ISSN (electronic): 1476-5535

Publisher: Springer

URL: http://dx.doi.org/10.1007/s10295-008-0359-0

DOI: 10.1007/s10295-008-0359-0

PubMed id: 18449586

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