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Formation of active nitrite reductase (cytochromecd 1) in the strainParacoccus denitrificans HUUG25
Authors:Ivana Mafchová  Igor Ku?era
Institution:(1) Department of Biochemistry, Faculty of Science, Masaryk University, Kotlářská 2, CZ-61137 Brno, Czech Republic
Abstract:Strain HUUG25 ofParacoccus denitrificans has been frequently thought to be devoid of allc-type cytochromes. We show here by means of enzymological and immunological techniques that the mutant synthesizes active nitrite reductase (cytochromecd 1) upon prolonged exposure to microoxic conditions. The synthesis occurred faster in the presence of exogenous hemin. The time pattern of 5-aminolevulinate synthase activity was also altered by the mutation. These findings suggest a defective regulation of heme supply to the site of nitrite reductase assembly in the periplasm.
Keywords:Nitrite reductase  Cytochromec            5-Aminolevulinate synthase  Heme  Strain HUUG25            Paracoccus denitrificans
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