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J Bacteriol. 2007 Jan;189(2):656-62. Epub 2006 Nov 10.

Respiratory nitrate ammonification by Shewanella oneidensis MR-1.

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  • 1Center for Microbial Ecology, Michigan State University, East Lansing, MI 48824-1325, USA.

Abstract

Anaerobic cultures of Shewanella oneidensis MR-1 grown with nitrate as the sole electron acceptor exhibited sequential reduction of nitrate to nitrite and then to ammonium. Little dinitrogen and nitrous oxide were detected, and no growth occurred on nitrous oxide. A mutant with the napA gene encoding periplasmic nitrate reductase deleted could not respire or assimilate nitrate and did not express nitrate reductase activity, confirming that the NapA enzyme is the sole nitrate reductase. Hence, S. oneidensis MR-1 conducts respiratory nitrate ammonification, also termed dissimilatory nitrate reduction to ammonium, but not respiratory denitrification.

PMID:
17098906
[PubMed - indexed for MEDLINE]
PMCID:
PMC1797406
Free PMC Article
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