Elucidation of the substrate supplying system in Toxoplasma gondii specific GTP-PK

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A pyruvate kinase II in mitochondria and apicoplast of Toxoplasma gondii has not been known its physiological function. To understand the physiological function of this enzyme, the substrate supplying system of this enzyme was investigated. For the first time, a production of two recombinant PEPCKs was studied. The genes of enzymes were produced by PCR using a cDNA of RH strain of T. gondii and reconstituted into a protein producing plasmid pGEX. Type I gene of PEPCK was recognized, however, type II gene was completely recognized. After several trials to other protein producing plasmid (pET etc.), we found that pCold TF plasmid producing a protein at low temperature could produce the type I recombinant PEPCK as a GST-fusion protein. Since type II PEPCK gene could not been obtained by PCR, we tried several PCR techniques (Taq polymerase, annealing Tm, thermal cycler, etc.). Finally, type II gene was obtained.