Zusammenfassung
Die Hydrogenomonas-Stämme H 1, H 16 und H 20 nutzen als einziges Kohlenhydrat Fructose; chemolithotroph gewachsene Zellen des Stammes H 16 oxydieren diesen Zucker nach einer lag-Phase von 20 min.
Die Fructose wird über den Entner-Doudoroff-Weg umgesetzt; während der Adaptation erhöht sich der Gehalt der Zellen an Phosphoglucose-Isomerase, Glucose-6-phosphat-Dehydrogenase und an den für den Entner-Doudoroff-Weg charakteristischen Enzymen.
Die Aktivität der Ribulosediphosphat-Carboxylase geht bei der Adaptation an Fructose innerhalb von 2 Std um 75% zurück, sinkt dann aber während mehrerer Fructose-Passagen nur langsam ab. Folglich kann selbst mit Fructose gewachsener Hydrogenomonas H 16 Kohlendioxyd über den Calvin-Cyclus fixieren.
Summary
The only carbohydrate utilized by Hydrogenomonas strains H 1, H 16 and H 20 is fructose; chemolithotrophically grown cells of strain H 16 oxidize this sugar following a lag-period of 20 min. Fructose is metabolized via the Entner-Doudoroff-pathway. During the adaptation to fructose, the level of the following enzymes increases in the cells: phosphoglucoseisomerase, glucose-6-phosphate-dehydrogenase and the enzymes characteristic of the Entner-Doudoroff-pathway.
During the change from chemolithotrophic to organotrophic growth, with fructose serving as a substrate, the activity of ribulose-diphosphate carboxylase is reduced by 75% within 2 hrs. However, following repeated growth in a fructose medium, this enzyme activity decreases only very slowly. Consequently fructose-grown Hydrogenomonas H 16 is capable of fixing carbon dioxide via the Calvin cycle.
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Gottschalk, G., Eberhardt, U. & Schlegel, H.G. Verwertung von Fructose durch Hydrogenomonas H16 (I.). Archiv. Mikrobiol. 48, 95–108 (1964). https://doi.org/10.1007/BF00406600
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DOI: https://doi.org/10.1007/BF00406600