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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Glucose-6-phosphate dehydrogenase of malaria parasite Plasmodium falciparum.

Plasmodium falciparum growth is impaired in glucose-6-phosphate dehydrogenase (G6PD)-deficient red blood cells (RBCs), and malaria has been implicated in the spreading of deficient variants in malaria-endemic areas. Recent reports suggest that the malaria parasite can adapt itself to grow in these variant RBCs by producing its own G6PD, but studies on parasite G6PD are very limited. In this report, we define the properties of the parasite G6PD. G6PD was partially purified from infected and uninfected variant RBCs associated with severe G6PD deficiency. G6PD from infected RBCs contained two components separable by starch gel electrophoresis: a major component (approximately 90% activity) with a very slow anodal electrophoretic mobility and a minor component (approximately 10% activity) with the same mobility as the host G6PD. Parasite G6PD exhibited much higher affinity (low Km) to G6P and nicotinamide-adenine dinucleotide phosphate (NADP) than did human G6PD. Southern blot hybridization indicated that the parasite genome contained nucleotide sequences that were hybridizable with the human G6PD cDNA. These data indicate that the parasite is capable of adapting to G6PD-deficient RBCs by producing its own G6PD.[1]


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