The electron transfer chain of aerobically grown Rhodopseudomonas viridis

Charlotte Kämpf, R. Max Wynn, Robert W. Shaw, David B. Knaff

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1 Scopus citations


Chemotrophically grown Rhodopseudomonas viridis contains little bacteriochlorophyll b and no detectable reaction center. Membranes isolated from chemotrophically grown Rps. viridis appear to contain cytochrome d and cytochrome o terminal oxidases. The membranes also appear to contain a cytochrome bc1 complex, since cytochrome c1 (Mr = 31 000, detected by immunoblotting) and b-cytochromes are present. Chemotrophically grown Rps. viridis contains neither the membrane-bound, reaction center-associated cytochrome c-552 c-558 peptide nor any soluble cytochrome c2. A previously undetected soluble b-type cytochrome, apparently absent in phototrophically grown Rps. viridis, was found in chemotrophically grown cells. Preliminary measurements indicate that cytochrome b-560 is probably a dimer of about 20 kDa subunits and has an oxidation-reduction midpoint potential of -20 mV.

Original languageEnglish (US)
Pages (from-to)228-238
Number of pages11
JournalBBA - Bioenergetics
Issue number2
StatePublished - Nov 19 1987


  • (Rps. viridis)
  • Chemotrophic growth
  • Cytochrome b-560
  • Electron transfer chain

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Cell Biology


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