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Enzyme Inhibition

Enzyme Inhibition

Inhibitors are molecules that reduce enzyme activity by binding to the enzyme. In a normally functioning cell, enzymes are regulated by a variety of inhibitors. Drugs and other toxins can also inhibit enzymes. Some inhibitors bind to the enzyme’s active site, while others inhibit enzymatic activity by binding to other sites on the protein structure.

Enzymes

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Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...

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Introduction to Mechanisms of Enzyme Catalysis

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...

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Induced-fit Model

Most chemical reactions in cells require enzymes—biological catalysts that speed up the reaction without being consumed or permanently changed. They reduce the activation energy needed to convert the reactants into products. Enzymes are proteins, that usually work by binding to a substrate—a reactant molecule that they act upon.
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Related Experiment Video

Updated: May 3, 2026

A Semi-High-Throughput Adaptation of the NADH-Coupled ATPase Assay for Screening Small Molecule Inhibitors

A Semi-High-Throughput Adaptation of the NADH-Coupled ATPase Assay for Screening Small Molecule Inhibitors

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Basic models for differential inhibition of enzymes.

Mario Cappiello¹, Roberta Moschini¹, Francesco Balestri¹

¹Department of Biology, University of Pisa, Via S. Zeno, 51, Pisa 56127, Italy.

Biochemical and Biophysical Research Communications

|February 18, 2014

Summary

This study introduces "intra-site differential inhibition," where inhibitors preferentially target one substrate of an enzyme. Kinetic models show this can occur via competitive or mixed inhibition, aiding enzyme control.

Keywords:

Aldose reductase Competing substrates Differential inhibition Enzyme inhibition

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Area of Science:

Biochemistry
Enzyme kinetics
Pharmacology

Background:

Enzyme inhibitors can exhibit complex interactions with multiple substrates.
Aldose reductase inhibition studies revealed preferential inhibitor action on one of two agonist substrates.
This phenomenon was termed "intra-site differential inhibition".

Purpose of the Study:

To develop basic kinetic models for intra-site differential inhibition.
To analyze the mechanisms underlying differential inhibition.
To guide the selection of differential inhibitors for enzyme activity control.

Main Methods:

Development of basic kinetic models for enzyme inhibition.
Analytical approach to study inhibitor-enzyme-substrate interactions.
Simulation of differential inhibition scenarios.

Main Results:

Differential inhibition can manifest as competitive or mixed-type inhibition.
The inhibitor predominantly binds to the free enzyme.
The kinetic models provide a framework for understanding differential inhibition.

Conclusions:

Intra-site differential inhibition is a viable mechanism for enzyme modulation.
Understanding these kinetics aids in designing targeted enzyme inhibitors.
This approach can help control enzymes with multiple substrates.