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Related Concept Videos

Enzyme Kinetics01:19

Enzyme Kinetics

81.0K
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...
81.0K
Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

24.4K
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 Inhibition01:30

Enzyme Inhibition

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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.
72.4K
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...
697
Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes01:28

Pharmacogenetics of Phase I Enzymes: Cytochrome P450 Isozymes

338
Cytochrome P450 (CYP450) enzymes are a superfamily of heme-containing monooxygenases that play a pivotal role in Phase I drug metabolism by catalyzing oxidation and reduction reactions.These enzymes transform lipophilic xenobiotics into more hydrophilic metabolites, facilitating subsequent Phase II conjugation and eventual excretion. The CYP450 family is classified into families (e.g., CYP1–CYP3) and subfamilies (e.g., CYP2A, CYP2C), based on amino acid sequence homology.CYP450...
338
Factors Affecting Drug Biotransformation: Biological01:19

Factors Affecting Drug Biotransformation: Biological

915
Biological factors significantly impact drug metabolism, influencing drug clearance, efficacy, and potential toxicity.
Species differences: Variations in enzyme systems across species can cause disparities in drug metabolism. For instance, humans may metabolize certain drugs faster than rodents, altering therapeutic effects.
Strain differences: Genetic variations within a species can result in differing enzyme activity, impacting drug response and toxicity. For example, some mouse strains may...
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Updated: May 3, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

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Variability in human in vitro enzyme kinetics.

Ying-Hong Wang1, Christopher R Gibson

  • 1Pharmacokinetics, Pharmacodynamics and Drug Metabolism, Merck Research Laboratories, West Point, PA, USA.

Methods in Molecular Biology (Clifton, N.J.)
|February 14, 2014
PubMed
Summary
This summary is machine-generated.

Human enzyme kinetic data show variability due to enzyme source, donor genetics, study design, and data analysis. Understanding these factors is crucial for accurate in vitro enzyme kinetics and reliable comparisons across studies.

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Enzyme kinetics

Background:

  • Human in vitro enzyme kinetic data exhibit significant variability.
  • Factors influencing these variations include enzyme preparation, donor genetics, and experimental design.

Purpose of the Study:

  • To comprehensively discuss factors contributing to variability in human in vitro enzyme kinetic data.
  • To highlight the importance of considering variability sources for accurate data interpretation and inter-study comparisons.

Main Methods:

  • Review of factors affecting enzyme kinetics, including enzyme source, donor background, study design, and data analysis.
  • Discussion of intra-experimental and inter-laboratory variability sources.
  • Examination of the impact of artificial microenvironments in recombinant enzymes versus native microsomes.

Main Results:

  • Enzyme source, preparation methods, donor genetics, and study design are key contributors to kinetic data variability.
  • Differences in experimental conditions and data analysis methods lead to inconsistent results.
  • Artificial microenvironments in recombinant systems can alter enzyme activity compared to native tissues.

Conclusions:

  • Acknowledging and addressing sources of variability is essential for robust and reproducible in vitro enzyme kinetic studies.
  • Careful consideration of experimental factors is necessary when comparing kinetic data across different studies and laboratories.
  • Standardization of methods and reporting is crucial for advancing the field of enzyme kinetics.