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The effect of dibromothymoquinone on respiratory and photosynthetic electron transport in Rhodopseudomonas capsulata chromatophores

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Abstract

Dibromothymoquinone has been shown to inhibit light-induced cytochrome b reduction, and oxidation of succinate and NADH by chromatophores of Rhodopseudomonas capsulata. The half-inhibitory concentration of light-induced reactions and NADH oxidation is 2.5 μM, but of succinate oxidation is 16 μM. Hexane extraction inhibited oxidation of NADH and succinate equally. The results are interpreted to suggest that ubiquinone is concerned in all three processes described, but that the pools associated with NADH and succinate oxidation are not equally accessible to dibromothymoquinone.

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Abbreviations

DBMIB:

Dibromothymoquinone

NADH:

Reduced nicotinamide adenine dinucleotide

Bchl:

Bacteriochlorophyll

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Author notes

  1. F. Hilary Evans

    Present address: Department of Biology, Preston Polytechnic, Preston, Lancs., UK

Authors and Affiliations

  1. Department of Biochemistry, University of Liverpool, P.O. Box 147, L69 3BX, Liverpool, UK

    F. Hilary Evans & Dorothea A. Gooding

Authors
  1. F. Hilary Evans
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  2. Dorothea A. Gooding
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Evans, F.H., Gooding, D.A. The effect of dibromothymoquinone on respiratory and photosynthetic electron transport in Rhodopseudomonas capsulata chromatophores. Arch. Microbiol. 111, 171–174 (1976). https://doi.org/10.1007/BF00446565

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  • DOI: https://doi.org/10.1007/BF00446565

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