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Pyruvate, orthophosphate dikinase (PPDK; E.C. 2.7.9.1) catalyzes the synthesis of the primary inorganic carbon acceptor, phosphoenolpyruvate in the C4 photosynthetic pathway and is reversibly regulated by light. PPDK regulatory protein (RP), a bifunctional serine/threonine kinase-phosphatase, catalyzes both the ADP-dependent inactivation and the Pi-dependent activation of PPDK. Attempts to clone the RP have to date proven unsuccessful. A bioinformatics approach was taken to identify the nucleotide and amino acid sequence of the protein. Based on previously established characteristics including molecular mass, known inter- and intracellular location, functionality, and low level of expression, available databases were interrogated to ultimately identify a single candidate gene. In this paper, we describe the nucleotide and deduced amino acid sequence of this gene and establish its identity as maize PPDK RP by in vitro analysis of its catalytic properties via the cloning and expression of the recombinant protein.
Phosphoenolpyruvate synthetase (PEPS; EC 2.7.9.2) catalyzes the synthesis of phosphoenolpyruvate from pyruvate in Escherichia coli when cells are grown on a three carbon source. It also catalyses the anabolic conversion of pyruvate to phosphoenolpyruvate in gluconeogenesis. A bioinformatics search conducted following the successful cloning and expression of maize leaf pyruvate, orthophosphate dikinase regulatory protein (PDRP) revealed the presence of PDRP homologs in more than 300 bacterial species; the PDRP homolog was identified as DUF299.
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