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The electron transfer chain of aerobically grownRhodopseudomonas viridis

Authors
Journal
Biochimica et Biophysica Acta (BBA) - Bioenergetics
0005-2728
Publisher
Elsevier
Publication Date
Volume
894
Issue
2
Identifiers
DOI: 10.1016/0005-2728(87)90192-7
Keywords
  • Cytochromeb-560
  • Electron Transfer Chain
  • Chemotrophic Growth
  • (Rps. Viridis)

Abstract

Abstract 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 bc 1 complex, since cytochrome c 1 ( M r = 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 c 2. 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.

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