Regulation of ADPGlucose Synthesis in Guard Cells of Commelina communis.
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.
Robinson
N L
NL
Department of Biochemistry and Biophysics, University of California, Davis, California 95616.
Zeiger
E
E
Preiss
J
J