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Energy Transduction in the Chromatophore Membrane

  • Margareta Baltscheffsky
Part of the Nobel Foundation Symposia book series (NOFS, volume 34)

Abstract

In chromatophore membranes from the photosynthetic bacterium Rhodospirillum rubrum inorganic pyrophosphate (PPi), which can be formed as an alternative end product to ATP in photophosphorylation, may also be utilized as energy donor in the dark in reversed energy conversion reactions. The light-induced energy conversion is reflected in a biphasic absorbance change of endogenous membrane-bound carotenoids. Evidence is presented that the slow phase of this absorbance change is in response to the presence and activity of the ATP-synthesizing enzyme. The present widespread use of the total carotenoid absorbance change as an indicator of a transmembrane potential is discussed and questioned. Alternative interpretations are given on the basis of our findings concerning different characteristics of two phases of the total carotenoid absorbance change.

Keywords

Photosynthetic Bacterium Absorbance Change Fast Phase Energy Transduction Rhodospirillum Rubrum 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • Margareta Baltscheffsky
    • 1
  1. 1.Department of Biochemistry, Arrhenius LaboratoryUniversity of StockholmStockholmSweden

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