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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.
 
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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.
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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.
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Introduction to Enzyme Kinetics01:19

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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.
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Considerations when Measuring Biocatalyst Performance.

Mafalda Dias Gomes1, John M Woodley2

  • 1Department of Chemical and Biochemical Engineering, Technical University of Denmark (DTU), DK-2800 Kgs Lyngby, Denmark. macoad@kt.dtu.dk.

Molecules (Basel, Switzerland)
|October 19, 2019
PubMed
Summary
This summary is machine-generated.

Accurate biocatalyst assessment requires three key metrics: product concentration, productivity, and enzyme stability. This approach moves beyond single metrics for better scalability evaluation.

Keywords:
biocatalysisenzyme kineticsenzyme stabilityimmobilized enzymesprocess performance metricsturnover number

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Area of Science:

  • Biocatalysis
  • Enzyme Engineering
  • Chemical Engineering

Background:

  • Biocatalysis is a maturing field requiring robust performance measurement.
  • Current methods often rely on single performance metrics, limiting scalability assessment.
  • Evaluating immobilization, operating modes, and reactor configurations necessitates comprehensive metrics.

Purpose of the Study:

  • To argue for a multi-metric approach to biocatalyst performance evaluation.
  • To identify key metrics essential for assessing biocatalyst scalability.
  • To move beyond conventional single-metric assessments.

Main Methods:

  • Literature review and theoretical argumentation.
  • Analysis of conventional biocatalyst performance metrics.
  • Proposal of a three-metric framework: achievable product concentration, productivity, and enzyme stability.

Main Results:

  • Single metrics like total turnover number are insufficient for scalability.
  • A combination of achievable product concentration, productivity, and enzyme stability provides a more accurate assessment.
  • This framework aids in evaluating immobilization, operating modes, and reactor designs.

Conclusions:

  • A three-metric system is crucial for accurate biocatalyst scalability assessment.
  • This comprehensive approach supports informed decisions in biocatalyst development and application.
  • Adopting these metrics will advance the field of industrial biocatalysis.