Abstract
Malaria is caused by Plasmodium parasite infection. The human malarial parasite does not have a de novo pathway for synthesis of nucleotides and the purine salvage pathway enzyme hypoxanthine guanine xanthine phosphoribosyltransferase (HGXPRT) is critical for survival. In our efforts to find inhibitors of the malarial parasite HGXPRT, we have developed a simple but effective purification protocol for this protein expressed in Escherichia coli without an affinity tag. The protocol consists of tandem columns of anion exchange and immobilized Reactive Red 120 resins. The enzyme is inactive as isolated but can be activated by incubation with substrate(s).
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