Abstract
Proteus vulgaris and P. mirabilis were grown anaerobically on glucose in the absence or presence of dimethylsulphoxide (DMSO) as electron acceptor or on (S)- or (RS)-lactate in the presence of nitrogen (N)-oxides, sulphur (S)-oxides or pyruvate. During growth on glucose the main fermentation product was ethanol and in the presence of DMSO it was (R)-lactate. Growth on (RS)-lactate led to acetate and (R)-lactate and growth on (S)-lactate produced almost only acetate. Depending on the growth medium, in crude extracts of P. vulgaris the activities of (R)-2-hydroxycarboxylate viologen oxidoreductase (HVOR), measured as (R)-lactate dehydrogenase, and DMSO reductase were 0.5–8.0 and 0.3–1.1 units (U)/mg protein, respectively. Addition of nitrate to the growth medium diminished both enzyme activities to <0.1 U/mg protein. P. mirabilis showed also high HVOR activity when grown on (RS)-lactate in the presence of DMSO. Also, Clostridium homopropionicum contained 1.8 U/mg of a pyridine-nucleotide-independent reversible (R)-lactate dehydrogenase when tested with the electron acceptor 1,1′-carbomoylmethylviologen (NH2CO-MV). None of the organisms studied were significantly active with (S)-lactate and NH2CO-MV. The possible physiological role of the HVOR may be as a dissimilatory (R)-lactate dehydrogenase.
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Schinschel, C., Simon, H. Effect of carbon sources and electron acceptors in the growth medium of Proteus spp. on the formation of (R)-2-hydroxycarboxylate viologen oxidoreductase and dimethylsulphoxide reductase. Appl Microbiol Biotechnol 38, 531–536 (1993). https://doi.org/10.1007/BF00242950
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DOI: https://doi.org/10.1007/BF00242950