Two regimens of electrogenic cyclic redox chain operation in chromatophores of non-sulfur purple bacteria A study using antimycin A

  • Remennikov V
  • Samuilov V
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Abstract

Antimycin A causes a biphasic suppression of the light-induced membrane potential generation in Rhodospirillum rubrum and Rhodopseudomonas sphaeroides chromatophores incubated anaerobically. The first phase is observed at low antibiotic concentrations and is apparently due to its action as a cyclic electron transfer inhibitor. The second phase is manifested at concentrations which are greater than 1-2 μM and is due to uncoupling that may be connected with an antibiotic-induced dissipation of the electrochemical H+gradient across the chromatophore membrane. The inhibitory effect of anti-mycin added at low concentrations under aerobic conditions is removed by succinate to a large extent. It is expected that the electrogenic cyclic redox chain in the bacterial chromatophores incubated under conditions of continuous illumination may function at two regimes: (1) as a complete chain involving all the redox components, and (2) as a shortened chain involving only the P-870 photoreaction center, ubiquinone and cytochrome c2. © 1979.

Author-supplied keywords

  • (Purple bacteria)
  • Antimycin A
  • Bacterial photosynthesis
  • Chròmatophore
  • Cyclic redox chain
  • Membrane potential

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Authors

  • Valentin G. Remennikov

  • Vitaly D. Samuilov

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