Chapter 14, Problem 26 The AG for hydrolytically removing a phosphoryl group from ATP is about twice as large as the AG for hydrolytically removing a phosphoryl group from AMP (-14 kJ mol'¹). The discrepancy exists because there is a large difference in the difference in and and stabilization between the reactants and products. Removing a phosphoryl group from AMP has a smaller change in free energy because stabilization between AMP (which has only one phosphate group) and Pi is not as large.
Catalysis and Enzymatic Reactions
Catalysis is the kind of chemical reaction in which the rate (speed) of a reaction is enhanced by the catalyst which is not consumed during the process of reaction and afterward it is removed when the catalyst is not used to make up the impurity in the product. The enzymatic reaction is the reaction that is catalyzed via enzymes.
Lock And Key Model
The lock-and-key model is used to describe the catalytic enzyme activity, based on the interaction between enzyme and substrate. This model considers the lock as an enzyme and the key as a substrate to explain this model. The concept of how a unique distinct key only can have the access to open a particular lock resembles how the specific substrate can only fit into the particular active site of the enzyme. This is significant in understanding the intermolecular interaction between proteins and plays a vital role in drug interaction.
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