Abstract
In a batch culture experiment the microaerophilic Campylobacter-like bacterium “Spirillum” 5175 derived its energy for growth from the reduction of nitrate to nitrite and nitrite to ammonia. Hereby, formate served as electron donor, acetate as carbon source, and l-cysteine as sulfur source. Nitrite was quantitatively accumulated in the medium during the reduction of nitrate; reduction of nitrite began only after nitrate was exhausted from the medium. The molar growth yield per mol formate consumed, Ym, was 2.4g/mol for the reduction of nitrate to nitrite and 2.0 g/mol for the conversion of nitrite to ammonia. The gain of ATP per mol of oxidized formate was 20% higher for the reduction of nitrate to nitrite, compared to the reduction of nitrite to ammonia. With succinate as carbon source and nitrite as electron acceptor, Ym was 3.2g/mol formate, i.e. 60% higher than with acetate as carbon source. No significant amount of nitrous oxide or dinitrogen was produced during growth with nitrate or nitrite both in the presence or absence of acetylene. No growth on nitrous oxide was found. The hexaheme c nitrite reductase of “Spirillum” 5175 was an inducible enzyme. It was present in cells cultivated with nitrate or nitrite as electron acceptor. It was absent in cells grown with fumarate, but appeared in high concentration in “Spirillum” 5175 grown on elemental sulfur. Furthermore, the dissimilatory enzymes nitrate reductase and hexaheme c nitrite reductase were localized in the periplasmic part of the cytoplasmic membrane.
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Abbreviations
- DNRA:
-
dissimilatory nitrate reduction to ammonia
- 〈N⦔:
-
assimilated nitrogen
- NaPi :
-
sodium phosphate
- OD578 :
-
optical density at 578 nm
- 〈S0〉:
-
elemental sulfur
- “Spirillum” 5175N,F,S :
-
“Spirillum” 5175 grown with nitrate, fumarate or elemental sulfur as electron acceptor
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Schumacher, W., Kroneck, P.M.H. Anaerobic energy metabolism of the sulfur-reducing bacterium “Spirillum” 5175 during dissimilatory nitrate reduction to ammonia. Arch. Microbiol. 157, 464–470 (1992). https://doi.org/10.1007/BF00249106
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DOI: https://doi.org/10.1007/BF00249106