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. 1980 Oct;77(10):5861-4.
doi: 10.1073/pnas.77.10.5861.

An activation factor of liver phosphofructokinase

E Furuya, K Uyeda

An activation factor of liver phosphofructokinase

E Furuya et al. Proc Natl Acad Sci U S A. 1980 Oct.

Abstract

Pure phosphofructokinase (ATP:D-fructose-6-phosphate 1-phosphotransferase, EC 2.7.1.11) from liver is strongly inhibited by ATP, whereas crude phosphofructokinase is only slightly inhibited by ATP. A factor that is removed from the enzyme during purification and can prevent the inhibition of phosphofructokinase by ATP has been isolated. The factor can be resolved into three components that differ in molecular weights, as shown by gel filtration on Sephadex G-25. These factors overcome the ATP inhibition but have no effect on the catalytic activity under the optimum assay conditions. Furthermore, AMP acts syngeristically with the activation factor in reversing ATP inhibition. It is proposed that the activation of phosphofructokinase by the activation factor and AMP is sufficient to account for the glycolytic flux in the liver.

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