1887

Abstract

An anaerobic enrichment from lake mud yielded a pure culture of a facultatively anaerobic bacterium able to grow on malonate under strictly anaerobic conditions. Strain 16mall was identified as a member of the family , and assigned to the genus on the basis of morphological, metabolic and biochemical characteristics. Malonate was fermented under strictly anaerobic (sulphide-reduced) conditions to acetate and CO concomitant with growth. A maximum growth rate of 1·88 generations h (μ = 1·30 h) was measured. The dry weight yield of cells from malonate was estimated at 2·5 g mol. Yeast extract was required for growth on malonate: other additives, or a vitamin solution, could not replace this requirement. Other dicarboxylic acids were not degraded in the absence or presence of malonate. Malonate was degraded under anaerobic, but not aerobic conditions. Malonate-decarboxylating activity was inducible by malonate under both anaerobic and aerobic conditions, and was not expressed in glucose- or citrate-grown anaerobic cultures. Monensin had no effect on malonate degradation, while 2,4-dinitrophenol decreased the rate of malonate degradation. This, with the lack of a sodium requirement for anaerobic growth on malonate, suggested that ATP generation may not be mediated by a sodium-pumping mechanism.

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1990-06-01
2022-01-25
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