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Functional characterization of the lesion in the ubiquinol: Cytochromec oxidoreductase complex isolated from the nonphotosynthetic strain R126 ofRhodobacter capsulatus

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Abstract

The cytochromebc 1 complexes from the nonphotosynthetic strain R126 ofRhodobacter capsulatus and from its revertant MR126 were purified. Between both preparations, no difference could be observed in the stoichiometries of the cytochromes, in their spectral properties, and in their midpoint redox potentials. Both also showed identical polypeptide patterns after electrophoresis on polyacrylamide gels in the presence of sodium dodecylsulfate. The ubiquinol: cytochromec oxidoreductase activity was strongly inhibited in the complex from the mutant compared to the one from the revertant. So was the oxidant-induced extra reduction of cytochromeb. Both preparations, however, showed an antimycin-induced red shift of cytochromeb, as well as antimycin-sensitive reduction of cytochromeb by ubiquinol. In accordance with a preceding study of chromatophores (Robertsonet al. (1986).J. Biol. Chem. 261, 584–591), it is concluded that the mutation affects specifically the ubiquinol oxidizing site, leaving the ubiquinol reducing site unchanged.

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Authors and Affiliations

  1. Istituto ed Orto Botanico, Università di Bologna, Via Irnerio 42, 40126, Bologna, Italy

    Javier G. Fernández-Velasco, Silvia Cocchi, Mauro Neri & B. Andrea Melandri

  2. Institut fuer Zellbiologie und Pflanzenphysiologie, Universitaet Regensburg, 8400, Regensburg, Germany

    Günter Hauska

Authors
  1. Javier G. Fernández-Velasco
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  2. Silvia Cocchi
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  3. Mauro Neri
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  4. Günter Hauska
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  5. B. Andrea Melandri
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Fernández-Velasco, J.G., Cocchi, S., Neri, M. et al. Functional characterization of the lesion in the ubiquinol: Cytochromec oxidoreductase complex isolated from the nonphotosynthetic strain R126 ofRhodobacter capsulatus . J Bioenerg Biomembr 23, 365–379 (1991). https://doi.org/10.1007/BF00762228

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