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Related Concept Videos

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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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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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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Determination of Michaelis Constant and Maximum Elimination Rate01:20

Determination of Michaelis Constant and Maximum Elimination Rate

170
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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Enzymes02:34

Enzymes

82.5K
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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Related Experiment Video

Updated: Sep 5, 2025

Measuring In Vitro ATPase Activity for Enzymatic Characterization
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Evaluating Enzymatic Productivity-The Missing Link to Enzyme Utility.

Khawar Sohail Siddiqui1, Haluk Ertan2,3, Anne Poljak4

  • 1School of Biotechnology and Biomolecular Sciences (BABS), The University of New South Wales (UNSW), Kensington, Sydney, NSW 2052, Australia.

International Journal of Molecular Sciences
|July 9, 2022
PubMed
Summary

Enzyme kinetic productivity analysis is crucial for assessing commercial viability but is often ignored. This review highlights its importance for optimizing enzyme applications and suggests methods to maximize enzyme productivity.

Keywords:
biocatalysischemical modificationenzymegenetic modificationimmobilizedindustrial biotechnologyinhibitionkineticsproductivitystability

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Area of Science:

  • Biotechnology
  • Enzymology
  • Biocatalysis

Background:

  • Kinetic productivity analysis is essential for enzyme characterization.
  • Productivity analysis is underreported in enzyme studies (<0.01%).
  • This metric is key to evaluating commercial potential.

Purpose of the Study:

  • To emphasize the significance of productivity analysis in enzyme research.
  • To demonstrate the value of reporting productivity data for native, modified, and immobilized enzymes.
  • To accelerate the adoption of enzymatic processes in biotechnology.

Main Methods:

  • Review of existing literature on enzyme characterization and productivity.
  • Analysis of case studies showcasing the importance of productivity data.
  • Identification of factors influencing enzyme-catalyzed reaction productivity.

Main Results:

  • Productivity analysis is the sole reliable indicator of commercial utility.
  • Productivity data is vital for optimizing enzymatic processes.
  • Examples illustrate the critical role of productivity in enzyme commercialization.

Conclusions:

  • Reporting enzyme productivity data is crucial for biotechnological advancement.
  • Implementing productivity analysis accelerates the translation of enzymes to commercial applications.
  • Strategies for maximizing enzyme-catalyzed reaction productivity are proposed.