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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...

Introduction to Mechanisms of Enzyme Catalysis

Introduction to Mechanisms of Enzyme Catalysis

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...

Induced-fit Model

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.
Enzymes exhibit substrate specificity, meaning that they can only bind to certain substrates. This is mainly determined by the shape and chemical...

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.

Allosteric Proteins-ATCase

Allosteric Proteins-ATCase

Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...

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Related Experiment Video

Updated: Apr 17, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

Substrate tunnels in enzymes: structure-function relationships and computational methodology.

Laura J Kingsley¹, Markus A Lill

¹Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy, Purdue University, West Lafayette, Indiana.

|February 10, 2015

Summary

This summary is machine-generated.

Enzyme active sites are often accessed via protein tunnels that act as filters, influencing substrate specificity and catalytic mechanisms. Computational tools help identify and analyze these tunnels for protein engineering and drug design applications.

Keywords:

CAVER IterTunnel MOLE REMD buried active site protein tunnels structure-function relationship

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Last Updated: Apr 17, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

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Defining Substrate Specificities for Lipase and Phospholipase Candidates

Defining Substrate Specificities for Lipase and Phospholipase Candidates

Published on: November 23, 2016

Area of Science:

Biochemistry
Structural Biology
Computational Biology

Background:

Enzymes catalyze biochemical reactions at their active sites.
In some enzymes, active sites are buried within the protein core, requiring substrates to traverse tunnels.
These tunnels can act as filters, impacting substrate specificity and catalytic mechanisms.

Purpose of the Study:

To review how enzyme tunnels influence substrate specificity and catalytic efficiency.
To summarize computational tools for identifying and analyzing enzyme tunnels.
To highlight the implications for protein engineering and drug design.

Main Methods:

Literature review of studies on enzyme tunnels.
Analysis of computational methods for tunnel identification and ligand migration.
Synthesis of findings on tunnel function and impact.

Main Results:

Enzyme tunnels play a crucial role in filtering substrates and modulating enzyme activity.
Tunnel characteristics significantly affect substrate specificity and catalytic efficiency.
Computational approaches are essential for characterizing these tunnel systems.

Conclusions:

Understanding enzyme tunnels is vital for advancing protein engineering and drug design.
Further development and application of computational tools will enhance our knowledge of enzyme function.
Enzyme tunnels represent key regulatory elements in biochemical processes.