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Untersuchungen zur Photophosphorylierung bei Rhodospirillum molischianum und Rhodospirillum rubrum

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Zusammenfassung

Die Thylakoide aus Rhodospirillum rubrum und Rhodospirillum molischianum werden nach Homogenisation der Zellen mit Ultraschall durch fraktionierte Zentrifugation isoliert. An diese Membranstrukturen ist das System der Photophosphorylierung gebunden. Die Aktivität dieses Systems in Abhängigkeit vom Redoxpotential des Mediums wird untersucht. Die stärkste Bindung anorganischen Phosphates wird unter Edelgasatmosphäre bei Zusatz von Spuren eines Elektronendonators (0,07 μmol Succinat je Ansatz) beobachtet. Die cyclische Photophosphorylierung wird einerseits durch Sauerstoff und oxydierende Verbindungen wie K3Fe(CN)6 anderseits durch „Überreduktion” mittels reduzierter Redoxverbindungen wie 2,6-Dichlorphenolindophenol oder Phenazinmethosulfat (beide reduziert durch Ascorbat) unter Wasserstoffatmosphäre gehemmt. Die Sauerstoffhemmung kann durch reduziertes Phenazinmethosulfat zu 50% aufgehoben werden. Antimycin A blockiert die lichtabhängige Phosphorylierung; 2,4-Dinitrophenol dagegen hemmt kaum. Die zellfreien Systeme beider Arten zeigen die gleiche Abhängigkeit vom Redoxpotential obwohl R. rubrum wesentlich sauerstofftoleranter ist als R. molischianum und auch durch oxydative Phosphorylierung im Dunkeln ATP bilden kann. Die Befunde sprechen für eine Unabhängigkeit der cyclischen Photophosphorylierung von der Atmungskette und für eine starke Übereinstimmung im Aufbau der Elektronentransportsysteme für die cyclische Photophosphorylierung bei R. rubrum und R. molischianum.

Summary

The isolated thylakoide-structures (chromatophores) of Rhodospirillum molischianum and Rhodospirillum rubrum are investigated with regard to activity of cyclic, light induced phosphorylation. A high activity of the photochemical apparatus needs an optimal external oxidation-reduction potential. Over-oxidation by oxygen or K3[Fe[CN)6] inhibit just as much as over-reduction by hydrogen and N-methyl phenazonium methosulfate or 2,6-dichlorphenol-indophenole both reduced with ascorbate. The highest activity is observed in hydrogen atmosphere without an electron-donator system or in helium with traces (0,07 μmol) of succinate. The inhibitoryeffect of oxygen can partly be compensated by reduced PMS. The photochemical apparatus of R. molischianum and R. rubrum react nearly in the same way on changes of the external oxidation-reduction potential and both systems are strongly inhibited by antimycin A but not by low concentrations of 2,4-dinitrophenole. R. molischianum is a strict anaerobic organism and can grow only in the light and under low oxygen partialpressure. In comparison with it R. rubrum is more oxygen-tolerant. The strain can grow under conditions of aerobic dark metabolism. The present results together with those of other investigations provide strong evidence for the conclusion that the systems of cyclic photophosphorylation in both organisms have the same composition and are relatively independent from the respiratory chain.

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Authors and Affiliations

  1. Aus dem Institut für Botanik der Universität Freiburg i. Br., Freiburg i. Br., Deutschland

    G. Drews

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  1. G. Drews
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Drews, G. Untersuchungen zur Photophosphorylierung bei Rhodospirillum molischianum und Rhodospirillum rubrum. Archiv. Mikrobiol. 48, 122–135 (1964). https://doi.org/10.1007/BF00408453

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  • DOI: https://doi.org/10.1007/BF00408453

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