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- W2048642571 abstract "The properties of spinach leaf sucrose-phosphate synthetase (EC 2.4.1.14) and cytosolic fructose-1,6-bisphosphatase (EC 3.1.3.11) have been studied. These two enzymes have been considered to be important in the control of sucrose synthesis. Sucrose-phosphate synthetase from leaf tissue has not been studied in detail previously and we report a technique for purifying this enzyme 50-fold by chromatography on AH-Sepharose 4B. This method frees the enzyme from contaminants which interfere with assay procedures with little or no loss of activity. The partially purified enzyme has a Km for UDP-glucose of 7.1 mm and for fructose 6-phosphate of 0.8 mm. Fructose 1,6-bisphosphate, inorganic phosphate and UDP are strong inhibitors. The inhibition patterns of these suggest that the enzyme operates either by an ordered bi-bi or a Theorell-Chance mechanism. Partially purified cytosolic fructose-1,6-bisphosphatase is not only inhibited by AMP as previously reported, but is also inhibited by fructose 6-phosphate and UDP. From our observations, we conclude that sucrose biosynthesis is indeed controlled through these two enzymes and it appears that the rate of sucrose synthesis is largely dependent upon the supply of triose phosphate and ATP from the chloroplast." @default.
- W2048642571 created "2016-06-24" @default.
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- W2048642571 date "1981-11-01" @default.
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- W2048642571 title "The purification and properties of sucrose-phosphate synthetase from spinach leaves: The involvement of this enzyme and fructose bisphosphatase in the regulation of sucrose biosynthesis" @default.
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- W2048642571 doi "https://doi.org/10.1016/0003-9861(81)90363-5" @default.
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