Answer to Question #83754 in Biochemistry for Effah George

Question #83754
If you were studying an enzyme that catalyzed the reaction of ATP and fructose 1- phosphate to form fructose 1,6-bisphosphate and ADP and discovered that a plot of the initial velocity of formation of fructose 1,6-bisphosphate versus ATP concentration was not hyperbolic, but rather sigmoid, what would you suspect?
1
Expert's answer
2018-12-14T12:45:11-0500

Sigmoidal velocity of formation of the end product can be explained by high concentration of ATP.

ATP causes this effect by binding to a specific regulatory site of enzyme, which is distinct from the regulatory site. Hence the high concentration of ATP has an inhibitory effect on velocity of reaction.

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