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Regulation of ADPGlucose Synthesis in Guard Cells of Commelina communis
Authors:Robinson N L  Zeiger E  Preiss J
Institution:Department of Biochemistry and Biophysics, University of California, Davis, California 95616;Department of Biological Sciences, Stanford University, Palo Alto, California 94305
Abstract:The activator specificity of the ADPglucose pyrophosphorylase from Commelina communis guard cells is the same as observed for the mesophyll cell enzyme. 3-Phosphoglycerate was found to be the most effective activator. Fifty per cent of maximal stimulation was observed at about 100 micromolar. Inorganic phosphate was found to be a potent inhibitor giving 50% inhibition at 0.3 millimolar. These results are discussed with respect to regulation of starch synthesis in guard cells.
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