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Different degradation pathways for glucose and fructose in Rhodopseudomonas capsulata

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Abstract

In Rhodopseudomonas capsulata the enzymes of the Entner-Doudoroff pathway and the Embden-Meyerhof pathway have been examined. Fructose-grown cells contained inducible activities of phosphoenolpyruvate-fructosephospho-transferase and 1-phosphofructokinase and only low levels of fructokinase and 6-phosphofructokinase. Although fructose-grown cells contained, in addition, all the enzymes of the Entner-Doudoroff pathway together with fructose-1,6-diphosphatase and phosphoglucose isomerase, the Entner-Doudoroff pathway was not operative in fructose catabolism and served only the degradation of glucose. The functional separation of glucose and fructose catabolism via the Entner-Doudoroff and a modified Embden-Meyerhof pathway, respectively, was confirmed by different approaches:

  1. 1.

    Radiorespirometric experiments with glucose and fructose labelled in positions 1, 2, 3+4 and 6 have been carried out. The pattern of 14CO2-evolution from position-labelled glucose was characteristic for the Entner-Doudoroff pathway, that from position-labelled fructose for the Embden-Meyerhof pathway.

  2. 2.

    In the presence of arsenite up to 50% of glucose-and fructose-carbon was excreted as pyruvate. Using 1-14C-glucose, 86% of the pyruvate was labelled in the carboxyl group, whereas using 1-14C-fructose only 19% of the pyruvate was labelled in the carboxyl group.

  3. 3.

    A glucose-6-phosphate dehydrogenase-deficient mutant was isolated which lacked a functional Entner-Doudoroff pathway but which was unaltered in its ability to grow on fructose.

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Abbreviations

EMP:

Embden-Meyerhof pathway

EDP:

F.ntner-Doudoroff pathway

PPP:

pentose-phosphate pathway

PEP-fructose-PTS:

phosphoenolpyruvate-fructose-phosphotransferase

1-PFK:

1-phosphofructokinase

6-PFK:

6-phosphofructokinase

PGI:

phosphoglucose isomerase

F-6-P:

glucose-6-phosphate

F-1-P:

fructose-1-phosphate

G-6-P:

glucose-6-phosphate

6-PG:

6-phosphogluconate

FDP:

fructose-1-6-diphosphate

KDPG:

2-keto-3-deoxy-6-phosphogluconate

DHAP:

dihydroxyacetonephosphate

GAP:

glyceraldehyde-3-phosphate

Ru-5-P:

ribulose-5-phosphate

PEP:

phosphoenolpyruvate

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Authors and Affiliations

  1. Institut für Mikrobiologie der Gesellschaft für Strahlen- und Umweltforschung mbH, Grisebachstr. 8, D-3400, Göttingen, Germany

    R. Conrad & H. G. Schlegel

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  1. R. Conrad
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  2. H. G. Schlegel
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Conrad, R., Schlegel, H.G. Different degradation pathways for glucose and fructose in Rhodopseudomonas capsulata . Arch. Microbiol. 112, 39–48 (1977). https://doi.org/10.1007/BF00446652

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