Abstract
The thermophilic cyanobacterium Mastigocladus laminosus was grown at different CO 2 concentrations and temperatures. Respiratory and photosynthetic electron transport in isolated membranes were measured and their activities were compared. Cells grown at low CO 2 concentration showed respiratory electron transport, whereas Photosystem-II-dependent transport was optimal in cells grown at high CO 2 concentrations. The respiratory electron transport from NADH and succinate were KCN-sensitive, whereas NADPH-dependent O 2 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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