What would be the result of an enzyme having a greater binding energy for the substrate than for the transition state?

Question

BlackTom AI · Accepted Answer

Here’s how to think through each option step by step:
Option 1: 'There would be no catalytic activity.' This is plausible because if the enzyme binds the substrate more strongly than it stabilizes the transition state, the activation energy is not lowered relative to the uncatalyzed reaction. In other words, stabilizing the ES complex more than the TS would hinder progress from substrate to product, reducing or eliminating catalytic turnover. This matches the idea that effective catalysis requires greater stabilization of the transition state than of the substrate.
Option 2: 'The catalytic activity would increase.' This is inconsistent with the scenario. Stronger binding to the substrate compared to the transition state means the enzyme is not lowering the energy barrier effectively; instead, it may raise or fail to reduce the barrier. Therefore this choice incorrectly predicts enhanced catalysis.
Option 3: 'The equilibrium point would shift toward the reactants.' While tempting to think that stronger ES binding might bias the overall reaction toward reactants, catalytic efficiency is primarily about lowering the activation barrier, not simply pulling the reaction toward reactants. Since the TS is not preferentially stabilized, the forward rate (toward products) is not enhanced, and the statement about the chemical equilibrium position is not a direct consequence of binding energy differences in the ES vs TS. This option adds a causal claim that isn’t the standard way to describe enzyme catalysis, making it dubious.
Option 4: 'The catalytic activity would be unaffected.' If the ES complex is stabilized much more than the TS, the enzyme would fail to lower the barrier as intended; activity would be diminished, not unaffected. This option overlooks the fundamental role of TS stabilization in catalysis and is therefore incorrect.

What would be the result of an enzyme having a greater binding energy for the substrate than for the transition state?单项选择题

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