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Enzyme Kinetics

Enzyme Kinetics

Enzymes speed up reactions by lowering the activation energy of the reactants. The speed at which the enzyme turns reactants into products is called the rate of reaction. Several factors impact the rate of reaction, including the number of available reactants. Enzyme kinetics is the study of how an enzyme changes the rate of a reaction.
Scientists typically study enzyme kinetics with a fixed amount of enzyme in the controlled environment of a test tube. When more reactant, or substrate, is...

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 a mild...

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 a mild...

Enzymes

Enzymes

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...

Introduction to Enzyme Kinetics

Introduction to Enzyme Kinetics

Enzyme kinetics studies the rates of biochemical reactions. Scientists monitor the reaction rates for a particular enzymatic reaction at various substrate concentrations. Additional trials with inhibitors or other molecules that affect the reaction rate may also be performed.
The experimenter can then plot the initial reaction rate or velocity (Vo) of a given trial against the substrate concentration ([S]) to obtain a graph of the reaction properties. For many enzymatic reactions involving a...

Transducer Mechanism: Enzyme-Linked Receptors

Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:

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Related Experiment Video

Updated: Jul 3, 2026

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy

Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy

Published on: July 1, 2021

Force-clamp spectroscopy detects residue co-evolution in enzyme catalysis.

Raul Perez-Jimenez¹, Arun P Wiita, David Rodriguez-Larrea

¹Department of Biological Sciences, Columbia University, New York, New York 10027, USA.

The Journal of Biological Chemistry

|August 9, 2008

Summary

Enzyme catalysis is fine-tuned by evolution. Positively correlated mutations enhance enzyme activity, while anti-correlated mutations inhibit it, revealing distant residue co-evolution in protein function.

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Area of Science:

Molecular Biology
Biochemistry
Evolutionary Biology

Background:

Enzyme catalytic mechanisms are optimized through evolutionary processes.
Co-evolution suggests compensatory mutations preserve protein structure and function.
Understanding these evolutionary pressures is crucial for molecular biology.

Purpose of the Study:

To investigate the impact of structurally distant correlated mutations on enzyme catalysis.
To probe how evolutionary changes affect enzyme function in Escherichia coli thioredoxin.
To provide direct evidence of distant residue co-evolution in enzyme catalysis.

Main Methods:

Combined statistical analysis of protein sequences.
Utilized single-molecule force-clamp spectroscopy.
Examined mutations in Escherichia coli thioredoxin.

Main Results:

Evolutionary anti-correlated mutations showed an inhibitory effect on enzyme catalysis.
Positively correlated mutations were found to rescue or enhance catalytic activity.
These findings suggest evolutionary tuning of enzyme-substrate binding and active site chemistry.

Conclusions:

Distantly correlated mutations play a significant role in enzyme evolution.
The study provides direct experimental observation of distant residue co-evolution.
Evolutionary forces optimize enzyme catalysis through coordinated changes in protein residues.