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Related Concept Videos

Enzyme Kinetics01:19

Enzyme Kinetics

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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.
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...
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Electrochemical Gradient and Channel Proteins: An Overview01:21

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An electrochemical gradient is a fundamental concept in biology and chemistry. It regulates the movement of ions across cell membranes. This movement is influenced by two factors:
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Introduction to Enzyme Kinetics01:19

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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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Induced-fit Model01:13

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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...
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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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Introduction to Solid Supported Membrane Based Electrophysiology
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A model study of sequential enzyme reactions and electrostatic channeling.

Changsun Eun1, Peter M Kekenes-Huskey2, Vincent T Metzger3

  • 1Howard Hughes Medical Institute, University of California, San Diego, La Jolla, California 92093, USA.

The Journal of Chemical Physics
|March 18, 2014
PubMed
Summary

Optimal reaction rates in coupled enzyme systems depend on enzyme arrangement and electrostatic interactions, not just proximity. Attractive forces significantly boost efficiency by confining substrates near enzymes.

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Area of Science:

  • Biochemistry
  • Chemical Kinetics
  • Systems Biology

Background:

  • Coupled enzyme reactions form basic units of biochemical networks.
  • Biological systems optimize metabolic efficiency and signaling through enzyme distribution and molecular interactions.

Purpose of the Study:

  • To investigate how enzyme distribution and long-range molecular interactions affect reaction kinetics in sequential enzyme-catalyzed reactions.
  • To determine the dependence of maximal product generation rate on enzyme distribution and electrostatic properties.

Main Methods:

  • Modeling of two sequential enzyme-catalyzed reactions.
  • Analysis of enzyme distributions and long-range molecular interactions (electrostatics).
  • Quantification of substrate transfer efficiency and reaction rates.

Main Results:

  • Enzyme proximity does not always guarantee optimal rates due to excluded volume effects.
  • Electrostatic potential significantly enhances substrate transfer efficiency between enzymes.
  • Attractive electrostatic interactions contribute more to throughput than directional fields by confining intermediates.

Conclusions:

  • Enzyme distribution and long-range electrostatic interactions critically influence coupled reaction efficiency.
  • Electrostatic channeling is supported, with attractive forces playing a key role in substrate confinement.
  • Findings provide insights into biological signaling and metabolic efficiency in enzyme systems.