What is the relationship between the rate of an...

Name: Problem 3, Chapter 11: Fundamentals of Biochemistry: Life at the Molecular Level
Uploaded: 2021-04-01T17:30:00-08:00
Duration: 3 min 22 s
Channel: Temi Ajayi
Description: What is the relationship between the rate of an enzymecatalyzed reaction and the rate of the corresponding uncatalyzed reaction? Do enzymes enhance the rates of slow uncatalyzed reactions as much as they enhance the rates of fast uncatalyzed reactions?

What is the relationship between the rate of an enzymecatalyzed reaction and the rate of the corresponding uncatalyzed reaction? Do enzymes enhance the rates of slow uncatalyzed reactions as much as they enhance the rates of fast uncatalyzed reactions?

Key Concepts

Rate Enhancement

Rate enhancement is the factor by which an enzyme increases the reaction rate compared to the uncatalyzed reaction. The magnitude of rate enhancement depends on how much the enzyme lowers the activation energy. Generally, very slow uncatalyzed reactions can be accelerated by many orders of magnitude, while reactions that are already fast have less dramatic relative increases.

Catalysis Efficiency

Catalysis efficiency encapsulates how effectively an enzyme accelerates a reaction relative to the reaction’s inherent rate. While enzymes can markedly enhance slow, uncatalyzed reactions, the degree of enhancement is related to the activation energy barrier of the original reaction rather than a fixed multiplicative factor for all reactions.

Activation Energy

Activation energy is the minimum amount of energy required for a chemical reaction to occur. Enzymes work by lowering the activation energy, which increases the reaction rate. This relationship is fundamental because it explains why enzymes can accelerate reactions that would otherwise be very slow under normal conditions.

Transition State Stabilization

Transition state stabilization refers to the ability of enzymes to bind more tightly to the transition state of a reaction than to the substrate or product. By stabilizing this high?energy state, enzymes reduce the energy barrier between reactants and products, making the reaction proceed faster.

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