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nmdcat.online June 27, 2026

In the mechanism of enzyme catalysis, the proximity effect refers to the observation that binding of substrates to the enzyme

A. Changes the dielectric constant of the active site
B. Provides the activation energy needed for the reaction
C. Increases the effective local concentration of the reactants
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D. Alters the primary structure of the substrate molecules

📝 Explanation

By binding separate substrates in adjacent binding sites on a single enzyme surface, the enzyme converts a slow, intermolecular, second-order reaction into a much faster, intramolecular, first-order reaction. This drastically increases the probability of productive collisions.

📖 Additional Information

  • Changes the dielectric constant of the active site
  • Provides the activation energy needed for the reaction
  • Increases the effective local concentration of the reactants
  • Alters the primary structure of the substrate molecules

By binding separate substrates in adjacent binding sites on a single enzyme surface, the enzyme converts a slow, intermolecular, second-order reaction into a much faster, intramolecular, first-order reaction. This drastically increases the probability of productive collisions.

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