Die Wirkung von Dinactin auf die cyclische Photophosphorylierung,die lichtinduzierte ATP-Pa-Austauschreaktion und den lichtinduzierten Protonentransport in Chloroplasten |
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Authors: | Reinhard Bachofen Ingrid Specht-Jürgensen |
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Affiliation: | (1) Institut für Allgemeine Botanik der Universität Zürich, Zürich, Deutschland |
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Abstract: | Summary Dinactin, an antibiotic forming complexes with K+ ions, uncouples phosphorylation in chloroplasts without requiring the presence of a substance increasing the permeability of the membrane for protons. To inhibit photophosphorylation, less Dinactin is necessary in the absence than in the presence of K+.When added before the light phase, Dinactin affects the light-triggered ATP-Pi exchange reaction in the same way as it does the complete photophosphorylation. Addition of the antibiotic after the activation by light inhibits the exchange reaction independently of the presence of K+, possibly by blocking the energy transfer to ATP.The inhibition of the light-induced proton transport by Dinactin is more pronounced in the presence of K+ than of Na+ ions. The manner in which changes in the permeability of the chloroplast membrane for K+ ions caused by Dinactin may influence photophosphorylation and reactions coupled with it is discussed. Verwendete Abkürzungen ATP Adenosintriphosphat - ADP Adenosindiphosphat - Pa anorganisches Phosphat - PMS Phenazinmethosulfat - DCPIP Dichlorphenolindophenol - FeCy Ferricyanid - DNP Dinitrophenol - FCCP Carbonylcyanid-p-trifluormethoxyphenylhydrazon - SQ 15859 Squibb Compound 15859 |
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