Recombinant Pyruvate phosphate dikinase protein (Active)

Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

Pyruvate phosphate dikinase (PPDK) is an enzyme that catalyzes the conversion of pyruvate ATP and inorganic phosphate into phosphoenolpyruvate AMP and pyrophosphate. It is also known by its alternate name PPDK. The enzyme has a molecular mass of approximately 95 kDa. PPDK is expressed in a wide variety of organisms including plants some bacteria and certain protozoa. It plays an important role in cellular energy metabolism particularly in environments where anaerobic conditions require alternate metabolic strategies.

Biological function summary

PPDK offers a significant contribution to the processes of photosynthesis and gluconeogenesis in plants. In C4 plants PPDK acts as a part of the C4 photosynthetic pathway which efficiently fixes CO2 via a complex series of reactions. This enzyme is not typically found in animals highlighting its unique role in organisms that employ such specialized processes. Additionally it functions as a monomer unlike some enzymes which operate only as part of a multimeric complex.

Pathways

PPDK is an integral component of the C4 and CAM (Crassulacean Acid Metabolism) photosynthesis pathways. In these pathways it facilitates the regeneration of phosphoenolpyruvate acting in tandem with enzymes like phosphoenolpyruvate carboxylase. This relationship allows organisms to optimize energy use and carbon fixation under specific environmental conditions. In glycolysis and gluconeogenesis PPDK manipulates energy balance and carbon flow alongside other metabolic proteins.

PPDK is linked to parasitic infections notably those caused by Giardia lamblia. The enzyme's unique expression in these organisms makes it a potential target for treatments aimed at disrupting energy metabolism in the parasite. In this context researchers investigate D-lactate dehydrogenase as a related protein also vital for the energy metabolism of these parasites to find effective therapeutic strategies. Understanding PPDK's role in these conditions might lead to novel interventions for parasite-induced diseases.