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Related Concept Videos

Induced-fit Model01:13

Induced-fit Model

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 characteristics of...
Enzyme Kinetics01:19

Enzyme Kinetics

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...
Enzymes02:34

Enzymes

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...
Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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...
Catalytically Perfect Enzymes01:07

Catalytically Perfect Enzymes

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.
Nonlinear Pharmacokinetics: Michaelis-Menten Equation01:18

Nonlinear Pharmacokinetics: Michaelis-Menten Equation

The Michaelis–Menten equation is a fundamental model for describing capacity-limited kinetics in drug metabolism. It offers insights into the rate of decline of plasma drug concentration Cp over time, with Vmax and KM as pivotal parameters.
Vmax represents the maximum achievable process rate, while KM, known as the Michaelis constant, signifies the drug concentration at which the process rate reaches half its maximum. This relationship between Vmax, KM, and Cp gives rise to three distinct...

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Related Experiment Video

Updated: Jun 28, 2026

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
14:27

Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity

Published on: August 19, 2013

[A model of enzymatic kinetics].

C Chevalet, M Gillois, A Micali

    Comptes Rendus Hebdomadaires Des Seances De L'Academie Des Sciences. Serie D: Sciences Naturelles
    |July 17, 1978
    PubMed
    Summary
    This summary is machine-generated.

    This study analyzes enzymatic reaction kinetics using differential equations. It reveals a unique, stable equilibrium point and a generalized Michaelis equation for reaction approximation.

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    Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
    14:27

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    Published on: August 19, 2013

    Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions
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    Hot Biological Catalysis: Isothermal Titration Calorimetry to Characterize Enzymatic Reactions

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    Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
    09:42

    Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

    Published on: January 16, 2016

    Area of Science:

    • Biochemistry
    • Chemical Kinetics
    • Mathematical Biology

    Context:

    • Enzymatic reactions are fundamental to biological processes.
    • Understanding reaction kinetics is crucial for drug development and metabolic studies.
    • Previous models often simplify complex enzymatic interactions.

    Purpose:

    • To analyze the mathematical properties of enzymatic reaction systems.
    • To establish the existence and stability of equilibrium points.
    • To explore the relationship between multi-enzyme systems and single-enzyme kinetics.

    Summary:

    • A unique, asymptotically stable equilibrium point exists for enzymatic reactions in biologically relevant closed systems.
    • Multi-enzyme systems exhibit substrate equilibrium concentrations within the range of individual enzyme equilibria.
    • The complex kinetics can be simplified to a first-order differential equation, generalizing the Michaelis equation.

    Impact:

    • Provides a deeper mathematical understanding of enzymatic reaction dynamics.
    • Offers a simplified model for predicting substrate concentrations in complex biological systems.
    • Potential applications in metabolic engineering and pharmaceutical research.