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- W1965549046 abstract "Rhodopseudomonas capsulata was grown under photoautotrophic conditions (on hydrogen-carbon dioxide), photoheterotrophic conditions (with glucose, malate, or pyruvate as carbon sources), and heterotrophic-aerobic conditions (with glucose, malate, pyruvate, acetate-bicarbonate, or acetate as carbon sources). Good growth was obtained with glucose as the sole carbon source on a minimal salts medium buffered with potassium phosphate (0.1 m). Polyglucose polymer was synthesized under all growth conditions. This synthesis occurred as early as the middle of the logarithmic phase of growth. Glucose-grown cells accumulated the highest levels of this polymer. Higher levels of polyglucose polymer were synthesized in the light than in the dark. Two of the enzymes responsible for polyglucose polymer synthesis in bacteria, ADP-glucose pyrophosphorylase and ADP-glucose-α-1,4-glucan transferase, were found to be present under all growth conditions in Rhodopseudomonas capsulata. The specific activity of citrate synthase, a key enzyme of the tricarboxylic acid cycle, was the highest of any enzyme studied and varied according to the conditions of growth. A glucose-inducible Entner-Doudoroff pathway was found in this organism. In glucose-grown cells there was a 3- to 5-fold increase in the specific activity of glucose-6-P dehydrogenase, a 10- to 15-fold increase in the specific activity of 6-phosphogluconate dehydrase, and a 2-fold increase in the specific activity of 2-keto-3-deoxy gluconate. Very low levels of phosphofructokinase and of 6-phosphogluconate dehydrogenase were found. Radiorespirometric experiments with glucose labeled in specific carbon atoms, confirmed that glucose was metabolized exclusively via the Entner-Doudoroff pathway." @default.
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- W1965549046 date "1970-09-01" @default.
- W1965549046 modified "2023-10-13" @default.
- W1965549046 title "Carbohydrate metabolism in Rhiodopseudomonas capsulata: Enzyme titers, glucose metabolism, and polyglucose polymer synthesis" @default.
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- W1965549046 doi "https://doi.org/10.1016/0003-9861(70)90011-1" @default.
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