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Related Concept Videos

Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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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 Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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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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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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Introduction to Enzymes01:22

Introduction to Enzymes

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The use of enzymes by humans dates to 7000 BCE. Humans first used enzymes to ferment sugars and produce alcohol without knowing that this was an enzyme-catalyzed reaction. Wilhelm Kuhne coined the term 'enzyme' in 1877 from the Greek words ‘en’ meaning ‘in’ or ‘within’ and ‘zyme’ meaning ‘yeast.’
Most enzymes are proteins that speed up biochemical reactions without being consumed. Enzymes contain one or more active sites that...
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Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
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Determination of Michaelis Constant and Maximum Elimination Rate01:20

Determination of Michaelis Constant and Maximum Elimination Rate

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The Michaelis constant (KM) and the theoretical maximum process rate (Vmax) are vital parameters in the Michaelis-Menten equation, central to many biochemical reactions. They provide essential insights into enzyme kinetics and drug metabolism.
These parameters can be estimated by analyzing plasma concentration data post-drug administration. A notable example of this application is phenytoin, a drug with capacity-limited kinetics. It's recommended that phenytoin should be administered at two...
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Related Experiment Video

Updated: Jun 25, 2025

A New Screening Method for the Directed Evolution of Thermostable Bacteriolytic Enzymes
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Systems and Methods for Continuous Evolution of Enzymes.

Anqi Chen1, Xinge Diana Zhang1, Aleksandra Đurđević Đelmaš2

  • 1School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, 02138, USA E-mail: Dr David A. Weitz: E-mail: Dr. Karla Milcic.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|May 23, 2024
PubMed
Summary
This summary is machine-generated.

Continuous evolution automates directed evolution for faster biomolecule and enzyme engineering. This method streamlines genetic diversification, selection, and function linkage, minimizing human intervention for novel biocatalyst development.

Keywords:
Continuous evolutionEvolvRMutaT7OrthoRepPACE

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Area of Science:

  • Biotechnology and Synthetic Biology
  • Molecular Biology and Biochemistry

Background:

  • Directed evolution is key for creating biomolecules with new functions.
  • Traditional methods are labor-intensive and time-consuming.
  • Continuous evolution offers an automated alternative to accelerate this process.

Purpose of the Study:

  • To review recent advancements in continuous evolution strategies.
  • To highlight applications in enzyme engineering.
  • To discuss limitations and future directions of the technology.

Main Methods:

  • Automating gene diversification for unbiased variant generation.
  • Implementing selection systems for diverse reaction types.
  • Linking genetic information to molecular function.

Main Results:

  • Continuous evolution has developed versatile strategies to overcome key challenges.
  • It enables efficient enzyme engineering for altered substrates or conditions.
  • The technology is applicable across various industries.

Conclusions:

  • Continuous evolution is a powerful, general tool for enzyme engineering.
  • Its expanding capabilities promise increased industrial impact.
  • Further development is needed to address current limitations.