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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

4.7K
The theory of catalytically perfect enzymes was first proposed by W.J. Albery and J. R. Knowles in 1976. These enzymes catalyze biochemical reactions at high-speed. Their catalytic efficiency values range from 108-109 M-1s-1. These enzymes are also called 'diffusion-controlled' as the only rate-limiting step in the catalysis is that of the substrate diffusion into the active site. Examples include triose phosphate isomerase, fumarase, and superoxide dismutase.
 
Most enzymes...
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Introduction to Mechanisms of Enzyme Catalysis01:13

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...
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Induced-fit Model01:13

Induced-fit Model

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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...
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Enzyme Kinetics01:19

Enzyme Kinetics

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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...
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Enzymes02:34

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 Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

30.3K
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...
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Related Experiment Video

Updated: Dec 9, 2025

A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
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A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes

Published on: November 7, 2012

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Directed evolution of enzymes.

Fabio K Tamaki1

  • 1Drug Discovery Unit, School of Life Sciences, University of Dundee, Dundee, U.K.

Emerging Topics in Life Sciences
|September 7, 2020
PubMed
Summary
This summary is machine-generated.

Directed Evolution of Enzymes (DEE) mimics natural evolution in vitro to create improved biocatalysts. This process enhances enzymatic activities and deepens our understanding of molecular evolution.

Keywords:
directed evolutionenzymologyprotein engineering

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Area of Science:

  • Biotechnology and Molecular Biology
  • Biocatalysis and Enzyme Engineering

Background:

  • Nature's evolutionary processes are complex and unpredictable.
  • Scientific understanding of biological evolution enables experimental mimicry.
  • Enzymes are crucial biological catalysts with potential for industrial applications.

Purpose of the Study:

  • To review the fundamental concepts of Directed Evolution of Enzymes (DEE).
  • To discuss methodologies, technical advancements, and applications of DEE.
  • To explore how DEE contributes to understanding molecular evolution.

Main Methods:

  • Replication of natural evolutionary steps: genetic variability introduction, selection, and inheritance.
  • In vitro evolution of enzymes to enhance biocatalytic properties.
  • Analysis of experimental evidence supporting molecular evolution hypotheses.

Main Results:

  • DEE successfully tailors biocatalysts for specific applications.
  • Expansion of the repertoire of enzymatic activities through directed evolution.
  • DEE provides experimental validation for theories of molecular evolution.

Conclusions:

  • Directed Evolution of Enzymes is a powerful tool for enzyme engineering.
  • DEE advances both practical biocatalysis and fundamental evolutionary biology.
  • Continued advancements in DEE promise broader applications and deeper insights.