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. 1975 Nov;151(2):327–336. doi: 10.1042/bj1510327

The purification and properties of pig spleen phosphofructokinase.

P E Hickman, M J Weidemann
PMCID: PMC1172363  PMID: 3166

Abstract

Pig spleen phosphofructokinase has been purified 800-fold with a yield of 17%. Two isoenzymes that appear to be kinetically identical can be separated by DEAE-cellulose column chromatography. In common with the enzyme from other mammalian sources, the spleen enzyme has a pH optimum of 8.2. At pH 7.0 it displays sigmoidal kinetics with respect to fructose 6-phosphate concentration but its co-operative behaviour is very dependent on pH, protein concentration and the concentration of MgATP. MgGTP and MgITP can replace MgATP as phosphate donors but, unlike MgATP, these nucleotides do not cause significant inhibition. Mn2+ and Co2+ (as the metal ion-ATP complexes) act as cofactors and in the free form are far more inhibitory than free Mg2+. The spleen enzyme responds to a wide variety of potential effector molecules: ADP, AMP, cyclic AMP, aspartate, NH4+, fructose 6-phosphate, fructose 1,6-diphosphate and Pi all act as either activators or protectors, whereas Mg-ATP, Mg2+, citrate, phosphoenol-pyruvate and the phosphoglucerates are inhibitors.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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