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Studies on rat and rabbit liver fructose 1.6-bisphosphatase inhibition by AMP showed that with an increase in EDTA concentration the hyperbolic AMP inhibition curve is transformed into a sigmoidal one. At intermediate EDTA concentrations, the kinetic curves have a plateau. The appearance of the intermediate plateau may be due to the superposition of kinetic curves corresponding to two enzyme forms simultaneously present in the assay mixture. One of these forms deprived of endogenous Me2+ (presumably Zn2+) is inhibited by AMP in a cooperative manner, while the other one retains Me2+ which prevents the cooperative response of the enzyme to AMP.
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