PMID:2512991

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Citation

Silvestro, A, Pommier, J, Pascal, MC and Giordano, G (1989) The inducible trimethylamine N-oxide reductase of Escherichia coli K12: its localization and inducers. Biochim. Biophys. Acta 999:208-16

Abstract

We used an anti-trimethylamine-N-oxide reductase (EC 1.6.6.9) serum and different immunological techniques (Ouchterlony, rocket immunoelectrophoresis, immunoblotting) to show that dimethylsulphoxide (DMSO), tetrahydrothiophene 1-oxide (THTO) and pyridine N-oxide (PNO) were effective inducers of the inducible form of trimethylamine N-oxide reductase. We confirmed this genetically and biochemically using a strain in which phage MudII 1734 carrying lacZ was inserted into torA, the structural gene for inducible trimethylamine-N-oxide reductase. By subcellular fractionation and quantitation with rocket immunoelectrophoresis, we showed that the enzyme was principally localized in the periplasmic fraction. Constitutive trimethylamine-N-oxide reductase was localized in the membrane fraction and, like the inducible enzyme showed a broad specificity with respect to various compounds such as DMSO, THTO and PNO. Apart from their immunological properties, the two enzymes could be clearly differentiated by their temperature stability.

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Keywords

Anaerobiosis; Dimethyl Sulfoxide/pharmacology; Enzyme Induction; Escherichia coli/drug effects; Escherichia coli/enzymology; Escherichia coli/genetics; Genotype; Immune Sera; Immunodiffusion; Immunoelectrophoresis; Kinetics; Macromolecular Substances; Methylamines/pharmacology; NADH, NADPH Oxidoreductases/biosynthesis; NADH, NADPH Oxidoreductases/isolation & purification; NADH, NADPH Oxidoreductases/metabolism; Oxidoreductases Acting on CH-NH Group Donors; Pyridines/pharmacology

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