Related Experiment Video
Updated: May 9, 2026
09:42
Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
Published on: January 16, 2016
Oscillatory enzyme reactions and Michaelis-Menten kinetics
1Unité de Chronobiologie Théorique, Faculté des Sciences, Université Libre de Bruxelles (ULB), Campus Plaine, CP 231, B-1050 Brussels, Belgium. agoldbet@ulb.ac.be
FEBS Letters
|July 30, 2013
Summary
Michaelis-Menten kinetics significantly impacts enzyme system oscillations, affecting period, amplitude, and waveform. This is crucial for understanding biological rhythms like glycolysis and cell cycles.
Area of Science:
- Biochemistry
- Systems Biology
- Enzymology
Background:
- Enzymatic systems often exhibit oscillatory behavior due to feedback regulation.
- Understanding the kinetics governing these oscillations is vital for comprehending cellular processes.
Purpose of the Study:
- To investigate the influence of Michaelis-Menten kinetics on oscillatory behavior in enzymatic systems.
- To model oscillations in phosphofructokinase (PFK) activity during glycolysis and cyclin-dependent kinases in the cell cycle.
Main Methods:
- Developed a model for PFK reaction involving a product-activated allosteric enzyme and enzymatic product degradation.
- Utilized Michaelis-Menten kinetics for phosphorylation-dephosphorylation in a model of Cdc2 kinase oscillations.
- Analyzed the impact of kinetic parameters on oscillation characteristics.
Main Results:
- The Michaelian nature of product decay significantly altered the period, amplitude, and waveform of PFK oscillations.
- Oscillations in Cdc2 kinase activity were highly dependent on the ultrasensitivity of the controlling enzymatic cascade.
- Michaelis-Menten kinetics were shown to be a critical determinant of oscillatory dynamics.
Conclusions:
- Michaelis-Menten kinetics play a fundamental role in shaping oscillatory patterns in key biological systems.
- The findings provide insights into the regulation of glycolysis and cell cycle progression.
- Kinetic models are essential for predicting and understanding complex biological oscillations.
Related Concept Videos
01:19Introduction 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...
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...
01:18Nonlinear 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...
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...
01:19Enzyme 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...
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...
01:20Determination 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...
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...
01:13Introduction 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...
01:13Introduction 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...