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- W2095071775 abstract "Chloroplast phosphofructokinase from spinach (Spinacia oleracea L.) was purified approximately 40-fold by a combination of fractionations with ammonium sulfate and acetone followed by chromatography on DEAE-Sephadex A-50. Positive cooperative kinetics was observed for the interaction between the enzyme and the substrate fructose 6-phosphate. The optimum pH shifted from 7.7 toward 7.0 as the fructose 6-phosphate concentration was taken below 0.5 mm. The second substrate was MgATP(2-) (Michaelis constant 30 mum). Free ATP inhibited the enzyme. Chloroplast phosphofructokinase was sensitive to inhibition by low concentration of phosphoenolpyruvate and glycolate 2-phosphate (especially at higher pH); these compounds inhibited in a positively cooperative fashion. Inhibitions by glycerate 2-phosphate (and probably glycerate 3-phosphate), citrate, and inorganic phosphate were also recorded; however, inorganic phosphate effectively relieved the inhibitions by phosphoenolpyruvate and glycolate 2-phosphate. These regulatory properties are considered to complement those of ADP-glucose pyrophosphorylase and fructosebisphosphatase in the regulation of chloroplast starch metabolism." @default.
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- W2095071775 date "1977-08-01" @default.
- W2095071775 modified "2023-10-03" @default.
- W2095071775 title "Chloroplast Phosphofructokinase" @default.
- W2095071775 doi "https://doi.org/10.1104/pp.60.2.295" @default.
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