Abstract
From anoxic marine sediment samples, new anaerobic, microaerotolerant, Gram-negative, non-sporeforming bacteria were isolated which grew in mineral medium with malonate as sole source of carbon and energy. Cells were motile thin rods, often forming large aggregates. Malonate was decarboxylated to acetate with concomitant growth yields of 1.9–2.1 g dry cell matter per mol malonate degraded. Fumarate and malate were fermented to succinate and CO2. No other substrates were used. No inorganic electron acceptors were reduced. At least 150 mM NaCl was required for growth with either substrate. High amounts of a periplasmic cytochrome c were detected, as well as small amounts of a membrane-bound cytochrome b. All enzymes of the citric acid cycle were found to be present. The DNA base ratio was 48.3 mol% guanine plus cytosine. Since this new bacterium cannot be affiliated with any of the known genera and species, a new genus and species, Malonomonas rubra is proposed.
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Dehning, I., Schink, B. Malonomonas rubra gen. nov. sp. nov., a microaerotolerant anaerobic bacterium growing by decarboxylation of malonate. Arch. Microbiol. 151, 427–433 (1989). https://doi.org/10.1007/BF00416602
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DOI: https://doi.org/10.1007/BF00416602