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. 1990 Apr 15;267(2):353–357. doi: 10.1042/bj2670353

Phosphofructokinase from Plasmodium berghei. Influence of Mg2+, ATP and Mg2(+)-complexed ATP.

D Buckwitz 1, G Jacobasch 1, C Gerth 1
PMCID: PMC1131295  PMID: 2139776

Abstract

The control enzyme phosphofructokinase is of regulatory significance in the metabolism of glucose by the malarial parasite Plasmodium berghei. (1) The enzyme was partially purified from erythrocytic stages of P. berghei by precipitation with poly(ethylene glycol) and chromatography on 2',5'-bisphosphoadenosine-Sepharose 4B. (2) Similarly to various other phosphofructokinases, the enzyme from P. berghei shows an allosteric behaviour. It is activated by fructose 6-phosphate and inhibited by ATP. (3) The effects of Mg2(+)-complexed ATP, free ATP and Mg2+ were studied by keeping constant the concentration of one of these and varying the concentrations of the other two. (4) The enzyme is shown to be allosterically inhibited by free ATP and by higher concentrations of Mg2+. Compared with phosphofructokinase of erythrocytes, inhibition by ATP is weaker by two orders of magnitude. Mg2(+)-complexed ATP has no effect on allosteric regulation. (5) The proposed kinetic model provides an adequate description of the data.

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Selected References

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