Abstract
Using an enrichment technique avoiding the dominating fast-growing speciesRhodobacter capsulatus andRhodobacter sphaeroides, a new strain (designated B2c; DSM 10 139) ofRhodoferax fermentans, a facultatively phototrophic member of the β subclass of Proteobacteria, was isolated. In contrast to the type strain of this species, strain B2c was capable of reducing nitrate. Strain B2c contained a highly active nitrate reductase [0.3–0.4 μmol min−1 (mg protein)−1] which, in extracts from spheroplasts prepared by ultrasonic treatment, was associated with the membrane fraction. The physiological role of nitrate reductase depended on the growth conditions. The enzyme enabled the strain to grow with nitrate as a nitrogen source and to maintain redox balance in a culture medium with a highly reduced carbon compound.
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