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Reduction of N-oxides and sulfoxide by the same terminal reductase inProteus mirabilis

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Abstract

Proteus mirabilis can grow anaerobically on the fermentable substrate, glucose. When the glucose medium was supplemented with an electron acceptor, growth doubled. However, the organism failed to grow anaerobically on the oxidizable substrate glycerol unless the medium was supplemented with an external electron acceptor. Dimethyl sulfoxide (DMSO), trimethylamine N-oxide (TMAO), nicotinamide N-oxide (NAMO), and nitrate (NO3) can serve this function. Cell-free extracts ofP. mirabilis can reduce these compounds in the presence of various electron donors. In order to determine whether the same or different terminal reductase(s) are involved in the reduction of these compounds, we isolated mutants unable to grow on glycerol/DMSO medium. When these mutants were tested on glycerol medium containing TMAO, NAMO, and NO3 as electron acceptors, it was found that there were two groups. Group I mutants were unable to grow with DMSO, TMAO, and NAMO, while their growth was unaffected with NO3. Group II mutants were unable to grow on any electron acceptor including NO3. Enzyme assays using reduced benzyl viologen with both groups of mutants were in agreement with growth studies. On the basis of these results, we conclude that the same terminal reductase is involved in the reduction of DMSO, TMAO, and NAMO (group I) and that the additional loss of NO3 reductase in group II mutants is probably owing to a defect in the synthesis or insertion of molybdenum cofactor.

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Authors and Affiliations

  1. Department of Biological Sciences, Northern Illinois University, 60115, DeKalb, IL, USA

    Adeline Valentine-Serano, M. E. S. Hudspeth &  R. Meganathan

Authors
  1. Adeline Valentine-Serano
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  2. M. E. S. Hudspeth
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  3. R. Meganathan
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Valentine-Serano, A., Hudspeth, M.E.S. & Meganathan, R. Reduction of N-oxides and sulfoxide by the same terminal reductase inProteus mirabilis . Current Microbiology 23, 271–276 (1991). https://doi.org/10.1007/BF02092029

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