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- W1537680255 abstract "Glucose-adapted Streptococcus faecalis produced little if any 14 CO 2 from glucose- 1 - 14 C , although high levels of glucose-6-phosphate dehydrogenase (EC 1.1.1.49) and 6-phosphogluconate dehydrogenase (EC 1.1.1.44) were detected in cell-free extracts. Metabolism of glucose through the oxidative portion of the hexose-monophosphate pathway was shown to be regulated in this organism by the specific inhibitory interaction of the Embden-Meyerhof intermediate, fructose-1, 6-diphosphate (FDP), with 6-phosphogluconate dehydrogenase. Glucose-6-phosphate dehydrogenase activity was unaffected by FDP. The S. faecalis 6-phosphogluconate dehydrogenase was partially purified from crude extracts by standard fractionation procedures and certain kinetic parameters of the FDP-mediated inhibition were investigated. The negative effector was shown to cause a decrease in V max and an increase in the apparent K m for both 6-phosphogluconate and nicotinamide adenine dinucleotide phosphate (NADP). These effects were apparently a consequence of the ligand interacting with the enzyme at a site distinct from either the substrate or the coenzyme sites. Among the evidence supporting this was the fact that β-mercaptoethanol blocked completely FDP inhibition, but had no effect on catalytic activity. The possibility that the regulation of 6-phosphogluconate dehydrogenase activity by FDP might be of some general significance was suggested by the observation that this enzyme from several other sources was also sensitive to FDP." @default.
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- W1537680255 date "1971-05-01" @default.
- W1537680255 modified "2023-10-17" @default.
- W1537680255 title "Mechanism for Regulating the Distribution of Glucose Carbon Between the Embden-Meyerhof and Hexose-Monophosphate Pathways in Streptococcus faecalis" @default.
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- W1537680255 doi "https://doi.org/10.1128/jb.106.2.456-467.1971" @default.
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