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Enzyme Kinetics

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...

Introduction to Enzyme Kinetics

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...

Concentration and Rate Law

Concentration and Rate Law

The rate of a reaction is affected by the concentrations of reactants. Rate laws (differential rate laws) or rate equations are mathematical expressions describing the relationship between the rate of a chemical reaction and the concentration of its reactants.
For example, in a generic reaction aA + bB ⟶ products, where a and b are stoichiometric coefficients, the rate law can be written as:

The Integrated Rate Law: The Dependence of Concentration on Time

The Integrated Rate Law: The Dependence of Concentration on Time

While the differential rate law relates the rate and concentrations of reactants, a second form of rate law called the integrated rate law relates concentrations of reactants and time. Integrated rate laws can be used to determine the amount of reactant or product present after a period of time or to estimate the time required for a reaction to proceed to a certain extent. For example, an integrated rate law helps determine the length of time a radioactive material must be stored for its...

Rate Laws and Equilibrium Constants for Elementary Reactions

Rate Laws and Equilibrium Constants for Elementary Reactions

Reactions proceed through multi-step mechanisms, where each elementary step is a single process and intermediates appear only between successive steps.Elementary reactions are categorized by molecularity which is the number of molecules reacting in one step.For example, unimolecular reactions involve one molecule, bimolecular reactions involve two, and termolecular reactions involve three; higher molecularity reactions are rarer because simultaneous multi-molecule collisions are unlikely.The...

Reaction Rate

Reaction Rate

The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...

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Related Experiment Video

Updated: May 9, 2026

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

A generic rate law for surface-active enzymes.

Onder Kartal¹, Oliver Ebenhöh

¹Department of Biology, Plant Biotechnology, Eidgenössische Technische Hochschule Zürich, CH-8092 Zürich, Switzerland.

|July 30, 2013

Summary

This summary is machine-generated.

Researchers developed new rate laws for surface-active enzymes, crucial for biochemical reactions at interfaces. This work unifies enzyme kinetics at surfaces, impacting our understanding of cellular processes.

Keywords:

Adsorption isotherm Available area function Enzyme kinetics Langmuir isotherm Random sequential adsorption Surface biochemistry Systems biology

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Area of Science:

Biochemistry
Chemical Physics
Enzyme Kinetics

Background:

Biochemical reactions often occur at interfaces like cell membranes.
Existing enzyme kinetics models do not adequately describe surface-active enzymes.
Lack of canonical rate laws hinders understanding of interfacial enzymatic processes.

Purpose of the Study:

To derive generic rate laws for enzymatic processes occurring at surfaces.
To bridge the gap between classical enzyme kinetics and surface chemical physics.
To provide a unifying framework for surface-active enzyme kinetics.

Main Methods:

Combined Michaelis-Menten kinetics approach with surface chemical physics concepts.
Developed a generic rate law incorporating an 'available area function'.
Illustrated the approach with a simple reversible surface conversion model.

Main Results:

Derived generic rate laws applicable to surface-active enzymes.
The 'available area function' unifies saturation and competition effects.
Demonstrated direct dependence of an enzyme's rate on other surface-bound enzymes.

Conclusions:

The new approach provides fundamental principles for surface-active enzyme kinetics.
Enables consistent mathematical modeling of complex interfacial enzymatic pathways.
Offers a unified perspective on enzyme behavior at surfaces.