Abstract
The ammonia oxidizers Nitrosomonas europaea and Nitrosomonas eutropha are able to grow chemoorganotrophically under anoxic conditions with pyruvate, lactate, acetate, serine, succinate, α-ketoglutarate, or fructose as substrate and nitrite as terminal electron acceptor. The growth yield of both bacteria is about 3.5 mg protein (mmol pyruvate)−1 and the maximum growth rates of N. europaea and N. eutropha are 0.094 d−1 and 0.175 d−1, respectively. In the presence of pyruvate and CO2 about 80% of the incorporated carbon derives from pyruvate and about 20% from CO2. Pyruvate is used as energy and only carbon source in the absence of CO2 (chemoorganoheterotrophic growth). CO2 stimulates the chemoorganotrophic growth of both ammonia oxidizers and the expression of ribulose bisphosphate carboxylase/oxygenase is down-regulated at increasing CO2 concentration. Ammonium, although required as nitrogen source, is inhibitory for the chemoorganotrophic metabolism of N. europaea and N. eutropha. In the presence of ammonium pyruvate consumption and the expression of the genes aceE, ppc, gltA, odhA, and ppsA (energy conservation) as well as nirK, norB, and nsc (denitrification) are reduced.
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This work was financially supported by the Deutsche Forschungsgemeinschaft (DFG) and Deutsche Bundesstiftung Umwelt (DBU).
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Schmidt, I. Chemoorganoheterotrophic Growth of Nitrosomonas europaea and Nitrosomonas eutropha . Curr Microbiol 59, 130–138 (2009). https://doi.org/10.1007/s00284-009-9409-8
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DOI: https://doi.org/10.1007/s00284-009-9409-8