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Pyruvate orthophosphate dikinase (PPDK) is a key enzyme in C4 photosynthesis and is also found in C3 plants. It is post‐translationally modified by the PPDK regulatory protein (RP) that possesses both kinase and phosphotransferase activities. Phosphorylation and dephosphorylation of PPDK lead to inactivation and activation respectively. Arabidopsis thaliana contains two genes that encode chloroplastic...
Cells associated with veins of petioles of C3 tobacco possess high activities of the decarboxylase enzymes required in C4 photosynthesis. It is not clear whether this is the case in other C3 species, nor whether these enzymes provide precursors for specific biosynthetic pathways. Here, we investigate the activity of C4 acid decarboxylases in the mid‐vein of Arabidopsis, identify regulatory regions...
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