Abstract
Summary The in vitro phosphorylation of PEP-carboxylase of the Crassulacean Acid Metabolism (CAM) plants Kalanchoe daigremontiana and K. blossfeldiana is reported in this paper. Phosphorylation was achieved by endogenous protein kinases. It leads to lowering of enzyme inhibition by the allosteric effector L-malate. The results support the hypothesis that reversible phosphorylation of the PEP-carboxylase protein is involved in the regulation of this enzyme during the day/night cycle of CAM.
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