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- W2365164967 abstract "Cell-free extracts of Streptomyces aureofaciens strain A3 degraded ribose-5-phosphare (R-5-P), resulting in the formation of sedoheptulose-7-phosphate (S-7-P), triosephosphate (G-3-P), and hexosephosphate (HP) under anaerobic condition. The operation of the pentose cycle was indicated by the finding that for a short incubation, 4.1μ moles of R-5-P were converted to 2.0μ moles of G-3-P and S-7-P each as required by the stoichiometry of the action of transketolase. Further evidence was obtained from the fact that the oxidation of R-5-P was inhibited by phosphate or arsenate and was relatively insensitive to iodoacetate. The formation of fructose-1,6-diphosphate (FDP) was demonstrated during the degradation of R-5-P. FDP could be either degraded according to the Embden-Meyerhof-Parnas system or first dephosphorylated to fructose-6-phosphate (F-6-P) by a phosphatase present in the cell-free extract, followed by a conversion to G-6-P which was then oxidized by way of the hexosemonophosphate shunt. Therefore, the two alternate pathways of carbohydrate catabolism are interconnected through the common intermediate metabolite, FDP, according to the following scheme. Phosphate exerted a marked inhibitory effect on the activity of the G-6-P dehydrogenase of S. aureofaciens and on the other hand, it was required for the action of 3-phosphoglyceraldehyde dehydrogenase. Thus its presence could switch the degradation of FDP from the hexosemonophosphate shunt toward the Embden-Meyerhof-Parnas pathway. It is concluded that both the Embden-Meyerhof-Parnas and the hexosemonophosphate shunt systems are operative in the cells of the ray fungus and that the relative activity of these two alternate pathways will depend on the cultural conditions, especially the concentration of phosphate ion in the medium." @default.
- W2365164967 created "2016-06-24" @default.
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- W2365164967 date "1959-07-01" @default.
- W2365164967 modified "2023-09-25" @default.
- W2365164967 title "Pentose metabolism and the influence of orthophosphate on the paths of sugar degradation of Streptomyces aureofaciens." @default.
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