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Introduction to Mechanisms of Enzyme Catalysis

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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...

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Related Experiment Video

Updated: Jul 6, 2026

Modeling an Enzyme Active Site using Molecular Visualization Freeware

Modeling an Enzyme Active Site using Molecular Visualization Freeware

Published on: December 25, 2021

A dynamic view of enzyme catalysis.

Aurora Jiménez¹, Pere Clapés, Ramon Crehuet

¹Departament de Química de Pèptids i Proteïnes, Institut d Investigacions Químiques i Ambientals de Barcelona, Jordi Girona 18, 08034, Barcelona, Catalonia, Spain.

Journal of Molecular Modeling

|March 7, 2008

Summary

Enzyme flexibility is crucial for catalysis, influencing both chemical reactions and substrate binding. Understanding these dynamics reveals how enzymes function and how metal ion substitutions can alter their activity.

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Area of Science:

Biochemistry and enzymology
Computational biophysics
Molecular dynamics

Background:

Enzymes are dynamic molecules, with flexibility directly linked to catalytic activity.
Enzyme movements occur across a broad timescale, from nanoseconds to milliseconds.

Purpose of the Study:

To investigate the relationship between enzyme dynamics and catalytic mechanisms.
To explore enzyme flexibility using transition path sampling and elastic network models.
To understand substrate binding and release influenced by active site dynamics.

Main Methods:

Transition path sampling for analyzing the transition state ensemble and energy flow.
Elastic network model for calculating normal modes and active site deformations.
Investigating chorismate mutase and L-rhamnulose-1-phosphate aldolase.

Main Results:

Transition path sampling provided an unbiased view of the transition state ensemble and local flexibility in chorismate mutase.
Lowest frequency normal modes in L-rhamnulose-1-phosphate aldolase induce active site changes affecting zinc ion coordination.
Zinc ion's coordination lability is essential for substrate binding and release, which is disrupted by magnesium substitution.

Conclusions:

Enzyme flexibility plays a critical role in both the chemical step and substrate exchange.
Specific enzyme dynamics, like active site deformations, are key to catalytic function.
The nature of the catalytic metal ion (e.g., zinc vs. magnesium) significantly impacts enzyme activity by altering ligand exchange capabilities.