Respiration in energy-transducing membranes of the thermophilic cyanobacterium Mastigocladus laminosus: I. Relation of the respiratory and photosynthetic electron transport |
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Authors: | Andres Binder Ruedi Hauser David Krogmann |
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Affiliation: | Institute for Plant Biology, University of Zürich, Zollikerstr. 107, CH - 8008 Zürich Switzerland |
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Abstract: | The thermophilic cyanobacterium Mastigocladus laminosus was grown at different CO2 concentrations and temperatures. Respiratory and photosynthetic electron transport in isolated membranes were measured and their activities were compared. Cells grown at low CO2 concentration showed respiratory electron transport, whereas Photosystem-II-dependent transport was optimal in cells grown at high CO2 concentrations. The respiratory electron transport from NADH and succinate were KCN-sensitive, whereas NADPH-dependent O2 uptake was not. It could be shown that NADH and succinate donate electrons in the photosynthetic electron pathway via Photosystem I. In cytochrome-c-553-depleted membranes added cytochrome c-553 could stimulate photosynthetic and respiratory electron transport. A common electron transport pathway between the quinone and cytochrome c is postulated. |
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Keywords: | Cyanobacterium Electron transport Photosynthesis Respiration Thermophilic bacterium (M. laminosus) Tricine DCMU 3-(3′,4′-dichlorphenyl)-1,1-dimethylurea TMPD |
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