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1. Phosphofructokinase from rat kidney cortex has been purified by affinity chromatography to a final specific activity of 15 units per mg of protein, measured at 25 degrees C and pH 8. 2. This lower spec. act., compared with that of the enzyme from other sources, shows the enzyme in proximal tubules to be less active, which would account for the main gluconeogenic role of these nephron sections. 3. The binding of fructose-6-phosphate to the enzyme is co-operative. ATP increases the Hill coefficient and produces a marked allosteric inhibition on the activity. 4. Fructose-2,6-bis-phosphate is a potent activator of the enzyme from this source. It reduces the Hill coefficient of the enzyme and the inhibition constant of ATP. A marked difference between this and the liver enzyme is that the activation is not co-operative.
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