The Effect of Redox Potential on the Coupling Between Rapid Hydrogen-Ion Binding and Electron Transport in Chromatophores from Rhodopseudomonas Spheroides

  • Richard J. Cogdell
  • J. Barry Jackson
  • Antony R. Crofts


The light-driven hydrogen-ion pump of chromatophores from photosynthetic bacteria is related to the processes of electron transport and the phosphorylation of ADP.1, 2, 3 Using pH indicator techniques4, 5, 6 a rapid component of H+-binding, whose kinetic parameters lie within the time range of the chromatophore electron transport reactions7 has been detected. A study of the effects of inhibitors, uncoupling agents and ion-transporting antibiotics on this phenomenon has led to the suggestion that hydrogen-ions bind at two distinct sites in the electron transport chain.6 Two models have been proposed to explain rapid H+-binding.


Redox Potential Midpoint Potential Bromocresol Purple Primary Acceptor Hydrogen Carrier 
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Copyright information

© Plenum Publishing Company Limited 1972

Authors and Affiliations

  • Richard J. Cogdell
    • 1
  • J. Barry Jackson
    • 1
  • Antony R. Crofts
    • 1
  1. 1.Department of Biochemistry, The Medical SchoolUniversity of BristolBristolEngland

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