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. 1968 Mar;43(3):417–427. doi: 10.1104/pp.43.3.417

Regulation of Starch Biosynthesis in Plant Leaves: Activation and Inhibition of ADPglucose Pyrophosphorylase 1

Ghirdhar Gopal Sanwal 1,2, Elaine Greenberg 1, Jeanne Hardie 1, Erma C Cameron 1, Jack Preiss 1
PMCID: PMC1086855  PMID: 5644247

Abstract

The ADPglucose pyrophosphorylases of 7 plant-leaf tissues were partially purified and characterized. In all cases the enzymes showed stability to heat treatment at 65° for 5 minutes in the presence of 0.02 m phosphate buffer, pH 7.0. The leaf ADPglucose pyrophosphorylases were activated 5 to 15-fold by 3-phosphoglycerate. Fructose-6-phosphate and fructose 1, 6-diphosphate stimulated ADPglucose pyrophosphorylase to lesser extents. The A0.5 (conc of activator required to give 50% of the observed maximal activation) of 3-phosphoglycerate for the barley enzyme was 7 × 10−6 m while for the sorghum enzyme it was 3.7 × 10−4 m. Inorganic phosphate proved to be an effective inhibitor of ADPglucose synthesis. The I0.5 (conc of inhibitor that gave 50% inhibition of activity for the various leaf enzymes varied from 2 × 10−5 m (barley) to 1.9 × 10−4 m (sorghum). This inhibition was reversed or antagonized by the activator 3-phosphoglycerate. These results form the basis for an hypothesis of the regulation of leaf starch biosynthesis.

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Selected References

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