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Related Concept Videos

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...
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...
Determination of Michaelis Constant and Maximum Elimination Rate01:20

Determination of Michaelis Constant and Maximum Elimination Rate

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...
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.
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Conjugate Addition of Enolates: Michael Addition01:08

Conjugate Addition of Enolates: Michael Addition

The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
Introduction to Mechanisms of Enzyme Catalysis01:13

Introduction to Mechanisms of Enzyme Catalysis

For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes a mild...

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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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Published on: January 16, 2016

Michaelis-Menten relations for complex enzymatic networks.

Anatoly B Kolomeisky1

  • 1Department of Chemistry, Rice University, Houston, Texas 77005-1892, USA. tolya@rice.edu

The Journal of Chemical Physics
|April 26, 2011
PubMed
Summary

Complex enzymatic networks can exhibit simple Michaelis-Menten kinetics under specific conditions. This study identifies criteria for observing this relationship in parallel enzymatic pathways, crucial for experimental studies.

Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Systems Biology

Background:

  • Biological processes rely on complex enzymatic reaction networks.
  • Many enzymatic networks exhibit surprising Michaelis-Menten kinetics, a simple hyperbolic relationship, despite their complexity.
  • The Michaelis-Menten mechanism was originally derived for single-pathway enzymatic chains.

Purpose of the Study:

  • To theoretically investigate the conditions under which complex enzymatic networks follow Michaelis-Menten kinetics.
  • To determine general criteria for observing Michaelis-Menten relationships in coupled parallel enzymatic pathways.
  • To provide insights for single-molecule experimental studies of enzymatic processes.

Main Methods:

  • Theoretical analysis of enzymatic networks with coupled parallel pathways.

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Analyzing Supercomplexes of the Mitochondrial Electron Transport Chain with Native Electrophoresis, In-gel Assays, and Electroelution

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  • Derivation of conditions for satisfying the Michaelis-Menten equation.
  • Illustration of results using a simple model.

    • Main Results:

    • The Michaelis-Menten equation is satisfied in complex enzymatic networks under specific relationships between chemical reaction rates.
    • The observed Michaelis-Menten behavior corresponds to a state with no flux between parallel pathways.
    • Derived criteria are applicable to understanding enzymatic processes in experimental settings.

    Conclusions:

    • Specific rate relationships and lack of flux between parallel pathways enable complex enzymatic systems to adhere to Michaelis-Menten kinetics.
    • The findings offer valuable criteria for interpreting experimental data, particularly in single-molecule studies.
    • This research clarifies the applicability of a fundamental enzymatic kinetics model to more intricate biological systems.