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Related Concept Videos

Introduction to Enzyme Kinetics01:19

Introduction to Enzyme Kinetics

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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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Kinetics describes the rate and path by which a reaction occurs. In contrast, thermodynamics deals with state functions and describes the properties, behavior, and components of a system. It is not concerned with the path taken by the process and cannot address the rate at which a reaction occurs. Although it does provide information about what can happen during a reaction process, it does not describe the detailed steps of what appears on an atomic or a molecular level. On the other hand,...
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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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Enzymes and Activation Energy01:13

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The activation energy (or free energy of activation), abbreviated as Ea, is the small amount of energy input necessary for all chemical reactions to occur. During chemical reactions, certain chemical bonds break, and new ones form. For example, when a glucose molecule breaks down, bonds between the molecule's carbon atoms break. Since these are energy-storing bonds, they release energy when broken. However, the molecule must be somewhat contorted to get into a state that allows the bonds to...
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Introduction to Mechanisms of Enzyme Catalysis01:13

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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...
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Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
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Transition state theory for enzyme kinetics.

Donald G Truhlar1

  • 1Department of Chemistry, Chemical Theory Center, and Supercomputing Institute, University of Minnesota, 207 Pleasant St. SE, Minneapolis, MN 55455, United States.

Archives of Biochemistry and Biophysics
|May 27, 2015
PubMed
Summary
This summary is machine-generated.

This essay explores modern transition state theory for enzyme reactions. It covers key concepts like potential of mean force, activation energy, and transmission coefficients for accurate reaction modeling.

Keywords:
Enzyme kineticsFree energyQuantum effectsTransition state theoryTunneling

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Area of Science:

  • Biochemistry
  • Chemical Physics
  • Enzyme Kinetics

Background:

  • Enzyme catalysis accelerates biochemical reactions.
  • Understanding reaction mechanisms is crucial for enzyme function.
  • Transition state theory provides a framework for studying reaction rates.

Purpose of the Study:

  • To discuss the fundamental concepts of applying modern transition state theory to enzyme-catalyzed reactions.
  • To highlight critical factors influencing reaction dynamics within enzymes.

Main Methods:

  • Conceptual discussion of theoretical frameworks.
  • Explanation of potential of mean force calculations.
  • Analysis of vibrational quantization effects.
  • Consideration of transmission coefficients for nonequilibrium effects, recrossing, and tunneling.

Main Results:

  • Detailed examination of the free energy of activation in enzymatic systems.
  • Exploration of how nonequilibrium effects impact reaction rates.
  • Discussion of recrossing and tunneling phenomena in enzyme active sites.

Conclusions:

  • Modern transition state theory offers a robust framework for dissecting enzyme reaction mechanisms.
  • Accurate modeling requires accounting for quantum effects and deviations from equilibrium.
  • Further application of these concepts can elucidate enzyme efficiency and design.